Prediction of non-linear mechanical behavior of shear deformed twill woven composites based on a multi-scale progressive damage model

Abstract A progressive damage model was presented for carbon fiber woven composites under low velocity impact, considering the strain rate sensitivity of both mechanical properties and failure mechanisms. In this model, strain rate dependency of elastic modulus and nominal strength along in-plane direction are considered. Based on the Weibull distribution, stiffness progressive degradation is conducted by introducing strain rate dependent damage variables for distinct damage modes. With the model implemented in ABAQUS/Explicit via user-defined material subroutine (VUMAT), the mechanical behavior and possible damage modes of composites along in-plane direction can be determined. Furthermore, a bilinear traction separation model and a quadratic stress criterion are applied to predict the initiation and evolution of interlaminar delamination. Comparisons are made between the experimental results and numerical simulations. It is shown that the mechanical response and damage characteristics under low velocity impact, such as contact force history and delamination, are more consistent with the experimental results when taken the strain rate effect into consideration.

Download Full-text

Multi-Scale Progressive Damage Model for Analyzing the Failure Mechanisms of 2D Triaxially Braided Composite under Uniaxial Compression Loads

Applied Composite Materials ◽

10.1007/s10443-018-9732-y ◽

2018 ◽

Vol 25 (4) ◽

pp. 921-938 ◽

Cited By ~ 4

Author(s):

Songjun Zhang ◽

Hongyong Jiang ◽

Yiru Ren ◽

Zhansen Qian ◽

Zheqi Lin

Keyword(s):

Uniaxial Compression ◽

Failure Mechanisms ◽

Damage Model ◽

Progressive Damage ◽

Braided Composite ◽

Multi Scale ◽

Progressive Damage Model

Download Full-text

A progressive damage model for 3D woven composites under compression

International Journal of Damage Mechanics ◽

10.1177/1056789518793994 ◽

2018 ◽

Vol 28 (6) ◽

pp. 857-876 ◽

Cited By ~ 6

Author(s):

Huaiyu Lu ◽

Licheng Guo ◽

Gang Liu ◽

Li Zhang

Keyword(s):

Failure Modes ◽

Damage Model ◽

Woven Composites ◽

Progressive Damage ◽

Misalignment Angle ◽

Woven Composite ◽

Damage Initiation ◽

3D Woven Composites ◽

Progressive Damage Model ◽

Transverse Failure

A progressive damage model is proposed to investigate the damage initiation and evolution of 3D woven composites under uniaxial compression at a micromechanical level. The typical compressive experiments were carried out. Based on the observations, the compression failure modes of 3D woven composites mainly include fiber kinking, transverse failure of fiber tow, matrix fracture, and interfacial debonding. The initial damage criteria are according to the physically based failure criteria for the fiber kinking, the Puck criteria for the transverse failure of fiber tow, and the maximum stress criterion for the matrix. The damage of fiber tow–matrix interfacial is simulated through cohesive contact. Particularly, the fiber’s initial misalignment angle is taken into account in the damage model. The simulated compression results agree well with the experimental ones. The compressive stress–strain response of the 3D woven composite is forecasted. The damage evolution of each constituent of the 3D woven composite is obtained. The results show that the influence of the fiber’s initial misalignment angle on the compression strength of the 3D woven composite needs to be considered.

Download Full-text