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									11.30


F. FATIGUE OF COMPOSITES

A Nanocomposite Laminate for Improved Durability and Stability in
Fatigue
D Davis, J Wilkerson (Texas A&M Univ) J Zhu (NanoRidge Materials)
A model carbon fiber reinforced epoxy nanocomposite laminate material system illustrates
improvements in cyclic fatigue life through the incorporation of single wall carbon nanotubes
(SWCNTs) as a nanoconstituent. The material shows more durability in tension-tension
fatigue and structural stability in tension-compression fatigue. (F13:1)

Fatigue Testing of Carbon Fabric Thermoplastics: Different Testing and
Instrumentation Strategies
W Van Paepegem, I De Baere, J Degrieck (Ghent Univ)
This paper presents the fatigue testing of carbon fabric thermoplastics in different loading
conditions: (i) tension-tension fatigue, (ii) bending fatigue and (iii) pure shear fatigue. New test
set-ups have been developed for bending and shear fatigue, and different instrumentation
strategies have been explored (optical fibre sensors, electrical resistance measurement).
(F13:2)

Fatigue Behaviour of YBCO Coated Conductor with Cu Layer At 77k
M Hojo, Y Yoshida, M Sugano, T Adachi, Y Inoue (Kyoto Univ) K Shikimachi, N Hirano, S
Nagaya (Chubu Electric Power Co)
We carried out fatigue tests of YBCO high-temperature superconducting coated conductor
with Hastelloy substrate and additional Cu layer in LN2, together with the measurement of the
critical current. The addition of a Cu layer increased the fatigue strength by about 19%. This
increase was higher than that for the static properties (5%). (F13:3)

Effect of Thermal Aging and Thermal Fatigue on Intralaminar Cracking in
Laminates Loaded in Tension
R Joffe (Swerea Sicomp) J Varna (Lulea Univ of Tech)
Laminated composites subjected to a large number of thermal cycles between cryogenic to
elevated temperatures close to glass transition, experience formation of intralaminar cracks,
causing degradation of thermo-mechanical properties. The objective of this paper is to
improve the understanding of the microdamage initiation and growth mechanisms in thermo-
mechanical fatigue. (F13:4)

Long-Term Life Prediction of Quasi-Isotropic CFRP Laminates with a
Hole under Compressive Loading
M Hiraoka, K Iwai, H Cai, M Nakada, Y Miyano (Kanazawa Inst of Tech)
This paper is concerned with the long-term life prediction of CFRP laminates with a hole
under compressive loading based on the accelerated testing methodology (ATM) combined
with the micromechanics of failure (MMF). The reliability of MMF/ATM methodology is
discussed by comparing the predicted results with the experimental ones. (F13:5)




14.10


F. FATIGUE OF COMPOSITES
oral

Calculation of Design Knockdown Factors for Composites Subjected to
Spectrum Loading based on a Residual Strength Model
S Case, J Lesko, N Post (Virginia Polytech Inst & State Univ)
Knockdown factors for static strength are calculated that incorporate changes in the
distribution of residual strengths that occur during the lifetime of composites subjected to
fatigue loading conditions. (F13:6)

Fracture Mode Dependent Damage Modelling of 3D-Textile Reinforced
Composites under Multiaxial Fatigue Loading
M Gude (TU Dresden)
For the simulation of the material degradation process of 3D-textile reinforced composites
during multiaxial fatigue loading a new physically based damage model has been developed
based on the fracture mode concept (FMC) of CUNTZE and the continuum damage
mechanics. The model parameter identification and model verification has been done in cyclic
tests under superposed tension/compression-torque loading. (F13:7)

Degradation of NCF-Epoxy Composites Containing Voids
F Gehrig, K Schulte (TU Hamburg-Harburg)
The degradation under uniaxial fatigue loading of NCF-composites is influenced by
manufacturing defects as voids, fibre misaligments and poor resin wetting. A fast model has
been developed to predict the life-time in accordance to the defects. Experimental tests were
performed to identify the model parameters and the model accuracy. (F13:8)

Physical Non-Linearity of Unidirectional Polymer Matrix Composites in
Cyclic Fatigue Life Analysis
M Magin, N Himmel (Univ Kaiserlautern)
The efficient use of fiber reinforced polymer matrix composites in load-carrying structures
requires detailed static and fatigue life analyses to assess their mechanical performance, cost,
and weight saving aspects. To accurately analyze the cyclic fatigue life of composite
laminates, the influence of the physical non-linearity of the unidirectional lamina in the cyclic
fatigue life analysis was examined using enhanced material models. (F13:9)

Analysis of Damage Evolution in Unidirectional Carbon/Epoxy Samples
under Shear Fatigue Loading
M May, S Hallett (Univ of Bristol)
Short Beam Shear tests on IM7/8552 carbon/epoxy showed different damage mechanisms
under fatigue and static loading. While sudden death failure is typical for static loading,
progressive damage evolution was found for cyclic loading. CT scans of samples that did not
show any external signs of damage revealed extensive internal cracking. (F13:10)



16.10


Influence of Nanoparticles on the Fatigue Life of Glass Fibre Reinforced
Epoxy Composites
L Boeger, MHG Wichmann, H Hedemann, K Schulte (TU Hamburg-Harburg)
In the presented work, the influence of different nanoparticle modifications on the fatigue life
of nanoparticle/glass-fibre epoxy hybrid composites was investigated. It was found that the
nanoparticles have a positive influence on the lifetime of the material under fatigue loading.
Additionally, there is a potential of the hybrid composites to act as self-sensing material for
damage monitoring in fibre reinforced composite structures. (F13:11)

Fatigue Damage Model for Short Glass Fibre Reinforced Thermoplastics
F Meraghni, H Nouri, C Czarnota (ENSAM) P Lory (Dimat Renault)
NEEDS 50 WORD ABSTRACT
(F13:12)



Modeling of the Fatigue Life of Adhesively-Bonded FRP Joints with
Genetic Programming
A Vassilopoulos, T Keller (EPFL)
Since recently, artificial neural network was the only method that was used for the fatigue life
modeling of composite materials and structures. A novel, in this field, computational technique,
called genetic programming, is used in this work to model the fatigue life of adhesively-
bonded FRP joints subjected to tensile fatigue loading under different environmental
conditions. (F13:13)

Advanced Accelerated Testing Methodology for Long-Term Life
Prediction of Polymer Composites
M Nakada, Y Hanatani, Y Miyano (KIT)
The advanced accelerated testing methodology (Advanced ATM) for the long-term life
prediction of polymer composites exposed to an actual loading having general stress and
temperature history is proposed in this paper. (F13:14)

								
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