Damage-mechanics analysis of matrix cracking in cross-ply CFRP laminates under thermal fatigue

2001 ◽  
Vol 61 (12) ◽  
pp. 1735-1742 ◽  
Author(s):  
Satoshi Kobayashi ◽  
Kazuhiro Terada ◽  
Shinji Ogihara ◽  
Nobuo Takeda
Keyword(s):  
Thermal Fatigue ◽  
Damage Mechanics ◽  
Matrix Cracking ◽  
Cfrp Laminates ◽  
Mechanics Analysis

Damage Mechanics Analysis of Transverse Cracking Evolution in Delaminated CFRP Laminates

1999 ◽  
Vol 18 (15) ◽  
pp. 1360-1366 ◽  
Author(s):  
S. Kobayashi ◽  
N. Takeda ◽  
S. Ogihara ◽  
A. Kobayashi
Keyword(s):  
Damage Mechanics ◽  
Cfrp Laminates ◽  
Transverse Cracking ◽  
Mechanics Analysis

scholarly journals Measurement of residual strains as a parameter of matrix cracking in CFRP laminates

2021 ◽  
Vol 15 (4) ◽  
pp. JAMDSM0040-JAMDSM0040
Author(s):  
M. J. Mohammad FIKRY ◽  
Shinji OGIHARA ◽  
Vladimir VINOGRADOV
Keyword(s):  
Matrix Cracking ◽  
Cfrp Laminates ◽  
Residual Strains

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.

Measurement of Residual Strains As a Parameter of Matrix Cracking in CFRP Laminates

2020 ◽  
Author(s):  
M. J. Mohammad Fikry ◽  
Shinji Ogihara ◽  
Vladimir Vinogradov
Keyword(s):  
Viscoelastic Behavior ◽  
Matrix Cracking ◽  
Time Dependent ◽  
Strain Gauges ◽  
Recovery Test ◽  
Cfrp Laminates ◽  
Matrix Cracks ◽  
Theoretical Predictions ◽  
Residual Strains ◽  
Good Agreement

Abstract Matrix cracking in CFRP laminates results in degradation of mechanical properties of the material and appearance of residual strains. In this study, the residual strains investigated are experimentally and analytically for CFRP [0/756]s laminates. The strain gauges were used in this study to measure the strains. Due to very small residual strains at the unloading condition, the residual strains were also measured at different stress levels for laminates with different crack densities and are compared with theoretical predictions. Time-dependent viscoelastic behavior of the material is also considered to accurately measure the residual strains due to the occurrence of matrix cracks. This was done by using the strain recovery test when the loads were stopped for 1–1.5 hours during unloading and the strain changes during these times were recorded. The experimental results of the residual strains are in reasonably good agreement with the theoretical predictions. The fiber non-linearity properties of the laminates may cause some experimental data to shift above the analytical line.

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