A simplified micromechanics model for predicting the stiffness degradation in symmetric composite laminates

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.

Download Full-text

Multi-directional stiffness degradation induced by matrix cracking in composite laminates

International Journal of Fatigue ◽

10.1016/s0142-1123(01)00066-4 ◽

2002 ◽

Vol 24 (2-4) ◽

pp. 119-125 ◽

Cited By ~ 15

Author(s):

X DUAN

Keyword(s):

Composite Laminates ◽

Matrix Cracking ◽

Stiffness Degradation ◽

Directional Stiffness

Download Full-text

Stiffness degradation induced by multilayer intralaminar cracking in composite laminates

Composites Part A Applied Science and Manufacturing ◽

10.1016/s1359-835x(98)00106-7 ◽

1999 ◽

Vol 30 (5) ◽

pp. 683-706 ◽

Cited By ~ 54

Author(s):

Junqian Zhang ◽

K. P. Herrmann

Keyword(s):

Composite Laminates ◽

Stiffness Degradation ◽

Intralaminar Cracking

Download Full-text

The Failure of Notched Composite Laminates Under Compression Using Integrated Macro-Micromechanics Model

46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference ◽

10.2514/6.2005-1954 ◽

2005 ◽

Cited By ~ 2

Author(s):

Junghyun Ahn ◽

Anthony Waas

Keyword(s):

Composite Laminates ◽

Micromechanics Model

Download Full-text

Property Degradation of Anisotropic Composite Laminates with Matrix Cracking. Part 2: Determination of Resolved Stiffness and Numerical Study of Stiffness Degradation

Journal of Reinforced Plastics and Composites ◽

10.1177/073168449701600505 ◽

1997 ◽

Vol 16 (5) ◽

pp. 478-486 ◽

Cited By ~ 1

Author(s):

Hua Yu ◽

Wang Xingguo ◽

Li Zhengneng ◽

He Qingzhi

Keyword(s):

Composite Laminates ◽

Numerical Study ◽

Matrix Cracking ◽

Stiffness Degradation ◽

Anisotropic Composite

Download Full-text

Study on the Characteristic Curve of Stiffness Degradation Caused by Transverse Matrix Cracking in Multidirectional Composite Laminates

Journal of Composite Materials ◽

10.1177/002199839603000704 ◽

1996 ◽

Vol 30 (7) ◽

pp. 820-838 ◽

Cited By ~ 4

Author(s):

Luo-Yu Xu

Keyword(s):

Composite Laminates ◽

Characteristic Curve ◽

Matrix Cracking ◽

Stiffness Degradation

Download Full-text

A Micromechanics Model for Thermoelastic Properties of Plain Weave Fabric Composites

Journal of Engineering Materials and Technology ◽

10.1115/1.2904322 ◽

1994 ◽

Vol 116 (4) ◽

pp. 517-523 ◽

Cited By ~ 95

Author(s):

H. T. Hahn ◽

R. Pandey

Keyword(s):

Representative Volume Element ◽

Composite Laminates ◽

Volume Element ◽

Thermoelastic Properties ◽

Micromechanics Model ◽

Plain Weave ◽

Representative Volume ◽

Thermal Expansion Coefficients ◽

Weave Fabric ◽

Effective Thermal Expansion

A micromechanics model is presented to predict thermoelastic properties of composites reinforced with plain weave fabrics. A representative volume element is chosen for analysis and the fiber architecture is described by a few simple functions. Equations are developed to calculate various phase fractions from geometric parameters that can be measured on a cross section. Effective elastic moduli and effective thermal expansion coefficients are determined under the assumption of uniform strain inside the representative volume element. The resulting model is similar to the classical laminated theory, and hence is easier to use than other models available in the literature. An experimental correlation is provided for a number of Nicalon SiC/CVI SiC and Graphite/CVI SiC composite laminates.

Download Full-text

Numerical Simulation of Unidirectional Hoop Composite Laminates under Flexural Loads

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.334-335.217 ◽

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.

Download Full-text