HCAT/JASPPA LANDING GEAR FATIGUE PROGRAM

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HCAT/JASPPA LANDING GEAR FATIGUE PROGRAM Powered By Docstoc
					 ALLOY       TARGET       0.75” dia.   1.5” dia
             UTS (ksi)
  4340        260-280      0.813”      1.563”

             284 actual
  300M        280-300      0.760”      1.625”

             289 actual
Aermet 100    280-290      0.760”      1.500”

             290 actual
                             Thickness
 Specimen Peen Coating          mils      R Environment Specimen ID's
 Hourglass    NO WCCo            3       -1      air    O1- 001 to 020 @
 Hourglass    Yes WCCo           3       -1      air    O1- 041 to 060 X
 Hourglass    NO  EHC            3       -1      air    O1- 101 to 120 X
 Hourglass    Yes EHC            3       -1      air    O1- 141 to 160 X
   Smooth     Yes WCCo           3       -1      air    O2- 001 to 020 X
   Smooth     Yes EHC            3       -1      air    O2- 021 to 040 X
 Hourglass    NO WCCo            3       0.1     air    O1- 021 to 040 X
 Hourglass    Yes WCCo           3       0.1     air    O1- 061 to 080 X
 Hourglass    NO  EHC            3       0.1     air    O1- 121 to 140 X
 Hourglass    Yes EHC            3       0.1     air    O1- 161 to 180 X
 Hourglass    Yes WCCo           3       -1    NaCl     O1- 081 to 100
 Hourglass    Yes EHC            3       -1    NaCl     O1- 181 to 200
Lg. Hourglass Yes WCCo           10      -1      air    O4- 001 to 020
Lg. Hourglass Yes EHC            10      -1      air    O4- 021 to 040

 Hourglass      NO    NONE               -1      air    M1-   001   to   020   X
 Hourglass      NO    WCCo      3        -1      air    M1-   021   to   040   @
 Hourglass      Yes   WCCo      3        -1      air    M1-   041   to   060   X
 Hourglass      NO     EHC      3        -1      air    M1-   081   to   100   X
 Hourglass      Yes    EHC      3        -1      air    M1-   101   to   120   X
   Smooth       Yes   WCCo      3        -1      air    M2-   001   to   020   X
   Smooth       Yes    EHC      3        -1      air    M2-   021   to   040   X
 Hourglass      Yes   WCCo      3        -1     NaCl    M1-   061   to   080
 Hourglass      Yes    EHC      3        -1     NaCl    M1-   121   to   140
Lg. Hourglass   Yes   WCCo      10       -1     NaCl    M4-   001   to   020
Lg. Hourglass   Yes    EHC      10       -1     NaCl    M4-   021   to   040

 Hourglass      NO    NONE               -1      air    A1-   001   to   020   X
 Hourglass      NO    WCCo      3        -1      air    A1-   021   to   040   @
 Hourglass      Yes   WCCo      3        -1      air    A1-   041   to   060   X
 Hourglass      NO     EHC      3        -1      air    A1-   081   to   100   X
 Hourglass      Yes    EHC      3        -1      air    A1-   101   to   120   X
   Smooth       Yes   WCCo      3        -1      air    A2-   001   to   020   X
   Smooth       Yes    EHC      3        -1      air    A2-   021   to   040   X
 Hourglass      Yes   WCCo      3        -1     NaCl    A1-   061   to   080
 Hourglass      Yes    EHC      3        -1     NaCl    A1-   121   to   140
Lg. Hourglass   Yes   WCCo      10       -1     NaCl    A4-   001   to   020
Lg. Hourglass   Yes    EHC      10       -1     NaCl    A4-   021   to   040
                                                  4340, SMOOTH SPECIMEN, R = -1

                              200
                                                                                           Bare/Peened (Nuse)
                              190                                                          EHC/Peened
                                                                                           EHC/Average
                                                                                           WCCo/Peened
                              180
ENGINEERING STRESS MAX, KSI




                                                                                           WCCo/Average

                              170


                              160


                              150


                              140


                              130


                              120


                              110


                              100
                                1.E+03   1.E+04          1.E+05          1.E+06   1.E+07                    1.E+08
                                                         CYCLES TO FAILURE, N f
                                                  300M, SMOOTH SPECIMEN, R = -1

                              200
                                                                                           EHC/Peened
                                                                                           EHC/Average
                              190
                                                                                           WCCo/Peened
                                                                                           WCCo/Average
                              180
ENGINEERING STRESS MAX, KSI




                              170


                              160


                              150


                              140


                              130


                              120


                              110


                              100
                                1.E+03   1.E+04          1.E+05          1.E+06   1.E+07              1.E+08


                                                         CYCLES TO FAILURE, N f
                                                  A100, SMOOTH SPECIMEN, R = -1

                              200
                                                                                           EHC/Peened
                              190                                                          EHC/Average
                                                                                           WCCo/Peened
                                                                                           WCCo/Average
                              180
ENGINEERING STRESS MAX, KSI




                              170


                              160


                              150


                              140


                              130


                              120


                              110


                              100
                                1.E+03   1.E+04          1.E+05          1.E+06   1.E+07              1.E+08
                                                         CYCLES TO FAILURE, N f
                                                  4340, SMALL HOURGLASS SPECIMEN
                                                      (0.003" COATING) R = 0.1, AIR
                              240
                                                                                      EHC/UNPeened
                              230                                                     EHC/UNPeened/Average
                                                                                      EHC/Peened
                              220                                                     EHC/Peened/Average
                                                                                      WCCo/UNPeened
                              210                                                     WCCo/UNPeened/Average
                                                                                      WCCo/Peened
ENGINEERING STRESS MAX, KSI




                              200                                                     WCCo/Peened/Average

                              190

                              180

                              170

                              160

                              150

                              140

                              130

                              120

                              110

                              100
                                1.E+03   1.E+04            1.E+05          1.E+06       1.E+07                1.E+08
                                                           CYCLES TO FAILURE, Nf
                                                 4340, SMALL HOURGLASS SPECIMEN
                                                     (0.003" COATING) R = -1, AIR
                              200

                                                                                     EHC/UNPeened
                              190                                                    EHC/UNPeened/Average
                                                                                     EHC/Peened
                                                                                     EHC/Peened/Average
                              180                                                    WCCo/UNPeened
                                                                                     WCCo/UNPeened/Average
ENGINEERING STRESS MAX, KSI




                                                                                     WCCo/Peened
                              170
                                                                                     WCCo/Peened/Average


                              160


                              150


                              140


                              130


                              120


                              110


                              100
                               1.E+03   1.E+04           1.E+05          1.E+06     1.E+07                 1.E+08

                                                         CYCLES TO FAILURE, N f
                                                  300M, SMALL HOURGLASS SPECIMEN
                                                      (0.003" COATING) R = -1, AIR
                              200
                                                                                     Bare/UNPeened
                                                                                     EHC/UNPeened
                              190                                                    EHC/UNPeened/Average
                                                                                     EHC/Peened
                                                                                     EHC/Peened/Average
                                                                                     WCCo/UNPeened
                              180
                                                                                     WCCo/UNPeened/Average
                                                                                     WCCo/Peened
ENGINEERING STRESS MAX, KSI




                                                                                     WCCO/Peened/Average
                              170


                              160


                              150


                              140


                              130



                              120


                              110


                              100
                                1.E+03   1.E+04           1.E+05          1.E+06       1.E+07                1.E+08

                                                          CYCLES TO FAILURE, Nf
                                                 A100, SMALL HOURGLASS SPECIMEN
                                                     (0.003" COATING) R = -1, AIR

                              190
                                                                                     Bare/UNPeened
                                                                                     EHC/UNPeened
                              180                                                    EHC/UNPeened/Average
                                                                                     EHC/Peened
                                                                                     EHC/Peened/Average
                              170                                                    WCCo/UNPeened
                                                                                     WCCo/UNPeened/Average
ENGINEERING STRESS MAX, KSI




                                                                                     WCCo/Peened
                              160
                                                                                     WCCo/Peened/Average



                              150


                              140


                              130


                              120


                              110


                              100


                               90
                               1.E+03   1.E+04            1.E+05         1.E+06     1.E+07                   1.E+08

                                                         CYCLES TO FAILURE, N f
                                                             4340, R = -1, AIR
                                          LARGE (0.010"CTNG) VS. SMALL (0.003"CTNG) HOURGLASS
                              200.0
                                                                                       LgHG/EHC/Peened
                                                                                       LgHG/EHC/Average
                              190.0                                                    LgHG/WCCo/Peened
                                                                                       LgHG/WCCo/Average
                                                                                       SmHG/EHC/Peened
                              180.0
                                                                                       SmHG/EHC/Average
ENGINEERING STRESS MAX, KSI




                                                                                       SmHG/WCCo/Peened
                              170.0                                                    SmHG/WCCo/Average



                              160.0


                              150.0


                              140.0


                              130.0


                              120.0


                              110.0


                              100.0
                                 1.E+03          1.E+04       1.E+05        1.E+06     1.E+07              1.E+08

                                                             CYCLES TO FAILURE, Nf
                                           4340, R = -1, SMALL HOURGLASS SPECIMEN
                                                   AIR VS. NaCl ENVIRONMENT
                              200
                                                                                       EHC/Air
                                                                                       EHC/Air/Average
                              190
                                                                                       EHC/NaCl
                                                                                       EHC/NaCl/Average
                              180                                                      WCCo/Air
                                                                                       WCCo/Air/Average
ENGINEERING STRESS MAX, KSI




                                                                                       WCCo/NaCl
                              170
                                                                                       WCCo/NaCl/Average


                              160



                              150



                              140



                              130


                              120



                              110



                              100
                                1.E+03   1.E+04       1.E+05          1.E+06        1.E+07                 1.E+08
                                                      CYCLES TO FAILURE, Nf
                                        A100, R = -1, SMALL HOURGLASS SPECIMEN
                                                AIR VS. NaCl ENVIRONMENT

                              200
                                                                                         EHC/Air
                                                                                         EHC/Air/Average
                                                                                         EHC/NaCl
                              190                                                        EHC/NaCl/Average
                                                                                         WCCo/Air
                                                                                         WCCo/Air/Average

                              180                                                        WCCo/NaCl
ENGINEERING STRESS MAX, KSI




                                                                                         WCCo/NaCl/Average



                              170




                              160




                              150




                              140



                              130




                              120
                               1.E+04          1.E+05                           1.E+06                      1.E+07
                                                        CYCLES TO FAILURE, Nf
                                                             300M, R = -1, NaCl
                                         LARGE (0.010") VS. SMALL (0.003") HOURGLASS SPECIMEN
                              200
                                                                                             SmHG/EHC
                                                                                             SmHG/EHC/Average
                              190                                                            SmHG/WCCo
                                                                                             SmHG/WCCo/Average
                                                                                             LgHG/EHC
                              180                                                            LgHG/EHC/Average
                                                                                             LgHG/WCCo
ENGINEERING STRESS MAX, KSI




                                                                                             LgHG/WCCo/Average
                              170


                              160


                              150


                              140


                              130


                              120


                              110


                              100
                                1.E+03           1.E+04            1.E+05           1.E+06                       1.E+07

                                                           CYCLES TO FAILURE, Nf
                                                             A100, R = -1, NaCl
                                         LARGE (0.010") VS. SMALL (0.003") HOURGLASS SPECIMEN

                              200
                                                                                             SmHG/EHC
                                                                                             SmHG/EHC/Average
                                                                                             SmHG/WCCo
                              190
                                                                                             SmHG/WCCo/Average
                                                                                             LgHG/EHC
                                                                                             LgHG/EHC/Average
                              180
ENGINEERING STRESS MAX, KSI




                                                                                             LgHG/WCCo
                                                                                             LgHG/WCCo/Average


                              170



                              160



                              150



                              140



                              130



                              120
                                1.E+03           1.E+04            1.E+05           1.E+06                      1.E+07

                                                           CYCLES TO FAILURE, Nf
R     ENVIR-   COATING           APPEARANCE @                 APPEARANCE @
     ONMENT                         FRACTURE                     RUN-OUT
-1     AIR      EHC      No spalling at all stress levels   N/A
                         for all 3 substrates
                WC/Co    Spalling near fracture plane for   N/A
                         all specimens.
                         Total spalling: 2/16 4340
                                           6/20 300M
                                          17/20 A100
R     ENVIR-    COATING        APPEARANCE @             APPEARANCE @ RUNOUT
     ONMENT                       FRACTURE
-1      AIR      EHC      Minor spalling @ 175 ksi      N/A
       (4340)             (5/5 specimens). None at
                          lower stresses

                 WC/Co    20/20 totally spalled         N/A


       NaCl      EHC      Minor spalling at various     N/A
      (300M,              stress levels.
       A100)               4/20 300M
                           6/20 A100

                 WC/Co    20/20 totally spalled, both   N/A
                          substrates
R      ENVIR- COATING            APPEARANCE @ FRACTURE                               APPEARANCE @ RUN-OUT
      ONMENT
0.1     AIR      EHC   No spalling. No apparent difference between peened         No spalling. No apparent difference
                (4340  and unpeened bars.                                         between peened and unpeened bars.
                only)
               WC/Co   Spalling near fracture plane on all specimens. No          Little/no evidence of cracking or
                (4340  completely spalled bars.                                   spalling.
                only).

-1      AIR        EHC      No spalling. No apparent difference between peened    No spalling. No apparent difference
                            and unpeened bars.                                    between peened and unpeened bars.

                  WC/Co     Spalling near fracture plane.                         Cracking/multicracking present.
                            Total spalling: 4340 – 0/20 peened & unpeened         Occasional spalling evident. (4340)
                                            300M – 4/20 peened, 2/20 unpeened
                                            A100 – 13/20 peened, 0/20 unpeened    No run-outs for 300M or A100


        NaCl       EHC      No spalling                                           N/A

                  WC/Co     4340: Spalling near fracture plane on all bars        N/A
                            300M: 14/20 bars not spalled
                            A100: Spalling on all bars, 1/20 completely spalled
                                                 MAXIMUM STRESS LEVEL, ksi

                                          4340    175   150    125    110

                                          300M    180   140    130    125

                                          A100    180   150    145    135
                       ENVIRON
SPECIMEN TYPE     R     MENT     SUBSTRATE

   SMOOTH         -1       AIR    4340 (4)         2     0      0      0

    (0.003")                       300M            1     1      1      3

5 SPECIMENS/STRESS LEVEL           A100            5     3      4      5
                                                  MAXIMUM STRESS LEVEL, ksi

                                           4340    175   150    125    110

                                           300M    180   140    130    125

                                           A100    180   150    145    135
                       ENVIRON
SPECIMEN TYPE     R     MENT      SUBSTRATE

   LARGE HG       -1       AIR      4340            5     5      5      5

    (0.010")

                           NaCl     300M            5     5      5      5

5 SPECIMENS/STRESS LEVEL            A100            5     5      5      5
                                                  MAXIMUM ST RESS LEVEL, ksi

                                           4340    175    150   125    110

                                           300M    180    140   130    125

                                           A100    180    150   145    135
                       ENVIRON
SPECIMEN T YPE    R     MENT       SUBST RAT E

   SMALL HG      0.1       AIR    UNPEENED 4340     0      0    0/RO    RO

    (0.003")                        PEENED 4340     0      0    0/RO    RO


                  -1       AIR    UNPEENED 4340     0      0     0      RO

                                           300M     0      1     1      0

                                           A100     0      0     0      0


                                    PEENED 4340     0      0    0/RO    RO

                                           300M     0      2     2      0

                                           A100     1      2     5      5


                           NaCl            4340     0      0     0      0

                                           300M     0      0     0      0

5 SPECIMENS/STRESS LEVEL                   A100     1      0     0      0
                          MAXIMUM STRESS LEVEL, ksi

                   4340    175   150    125    110

                   300M    180   140    130    125

                   A100    180   150    145    135

TOTAL NUMBER SPALLED,
  ALL COMBINATIONS         25     24    28     28
Test Stress    190 ksi   165 ksi   140 ksi     115 ksi
 (R = -1)                                       (RO)
Frequency       5 Hz      5 Hz     29-59 Hz   29-59 Hz
Observ. Pts.   1k, 3k    1k, 10k   1k, 100k   1k, 100k

				
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