Stiffness degradation induced by multilayer intralaminar cracking in composite laminates

1999 ◽  
Vol 30 (5) ◽  
pp. 683-706 ◽  
Author(s):  
Junqian Zhang ◽  
K. P. Herrmann
Keyword(s):  
Composite Laminates ◽  
Stiffness Degradation ◽  
Intralaminar Cracking

Prediction of stiffness degradation in hygrothermal aged [θm/90n]S composite laminates with transverse cracking

2008 ◽  
Vol 199 (1-3) ◽  
pp. 199-205 ◽  
Author(s):  
E.A. Adda-bedia ◽  
M. Bouazza ◽  
A. Tounsi ◽  
A. Benzair ◽  
M. Maachou
Keyword(s):  
Composite Laminates ◽  
Stiffness Degradation ◽  
Transverse Cracking

NUMERICAL PREDICTION OF STIFFNESS DEGRADATION OF THIN-PLY CFRP LAMINATES UNDER FATIGUE LOADING

2021 ◽  
Author(s):  
RYOMA AOKI ◽  
RYO HIGUCHI ◽  
TOMOHIRO YOKOZEKI
Keyword(s):  
Composite Laminates ◽  
Damage Mechanics ◽  
Crack Density ◽  
Continuum Damage Mechanics ◽  
Fatigue Loading ◽  
Stiffness Degradation ◽  
Cfrp Laminates ◽  
Mechanics Model ◽  
Element Simulation ◽  
Proposed Model

This study aims to conduct a fatigue simulation for predicting the stiffness degradation of thin-ply composite laminates with several ply thicknesses. For the simulation, a fatigue evolution model of intra-laminar damage in thin-ply composite laminates considering the effect of ply thickness was proposed. The intra-laminar damage evolution was modeled using the continuum damage mechanics model and the static and fatigue evolution law were formulated by relating the transverse crack density to the damage variable. The finite element simulation using the proposed model was conducted to predict the stiffness degradation of the laminates as a function of the number of loading cycles. The simulation results show that the experimental data can be reproduced by using the proposed fatigue model.

Microdamage in Composite Laminates: Experiments and Observation

2014 ◽  
Vol 518 ◽  
pp. 84-89
Author(s):  
Janis Varna ◽  
Leif Asp
Keyword(s):  
Composite Laminates ◽  
Speckle Interferometry ◽  
Damage State ◽  
Axis Orientation ◽  
Fiber Reinforced Composite ◽  
X Ray ◽  
Reinforced Composite ◽  
Loading Direction ◽  
Intralaminar Cracking

The first mode of damage in fiber reinforced composite laminates is usually intralaminar cracking in layers with off-axis orientation regarding the main loading direction. This papers analyzes the most typical methods used for the characterization of the damage state: edge replicas, optical microscopy, x-ray images, acoustic emission, speckle interferometry and Raman spectroscopy

Numerical Simulation of Unidirectional Hoop Composite Laminates under Flexural Loads

2007 ◽  
Vol 334-335 ◽  
pp. 217-220
Author(s):  
Li Li Tong ◽  
Zhen Qing Wang ◽  
Bao Hua Sun
Keyword(s):  
Numerical Simulation ◽  
Composite Laminates ◽  
Calculated Result ◽  
Composite Laminate ◽  
Stiffness Degradation ◽  
Test Results ◽  
Degradation Model ◽  
Compressive Stresses

Numerical simulation for unidirectional hoop composite laminates under flexural loads was finished. The change of tensile and compressive stresses, the position of local crush and delamination and stiffness degradation were analyzed with parametric program compiled by APDL language in ANSYS. The results showed that composite laminate could bear the load continually after local crush and delamination. Displacements of calculated result with stiffness degradation model matched test results well.

In-situ fatigue life prognosis for composite laminates based on stiffness degradation

2015 ◽  
Vol 132 ◽  
pp. 155-165 ◽  
Author(s):  
Tishun Peng ◽  
Yongming Liu ◽  
Abhinav Saxena ◽  
Kai Goebel
Keyword(s):  
Fatigue Life ◽  
Composite Laminates ◽  
Stiffness Degradation ◽  
Life Prognosis
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