3D Gradual Material Degradation Model for Progressive Damage Analyses of Unidirectional Composite Materials

Zhao, Libin; Qin, Tianliang; Zhang, Jianyu; Chen, Yuli

doi:10.1155/2015/145629

Cited by 7 publications

(14 citation statements)

References 47 publications

(62 reference statements)

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“…The modified maximum stress criterion ] is adopted to predict the initiation of the fiber crack and interfiber crack. The 3D gradual material degradation model [Zhao, Qin, Zhang et al (2015)] is used to define the damage evolution and the constitutive equation of the damaged materials.…”

Section: Pdmmentioning

confidence: 99%

“…The material degradation model is established under a local coordinate O-1'2'3' fixed to the cracks [Zhao, Qin, Zhang et al (2015)], as shown in Fig. 8.…”

Section: Materials Degradation Modelmentioning

confidence: 99%

“…The most critical stress is assumed to drive the inter-fiber crack without regard to the stress interaction. The damage variable is expressed as max ( , , ) 2,3 [Zhao, Qin, Zhang et al (2015)].…”

Section: Materials Degradation Modelmentioning

confidence: 99%

“…In later work, a 3D gradual degradation model was developed to account for the nonlinear behavior and some damage characters such as the inter-fiber crack orientation, crack closure, etc. [Zhao, Qin, Zhang et al (2015)]. However, the CEL in the 3D gradual degradation model was determined using a rough model that was simply extended from 2D CEL.…”

mentioning

confidence: 99%

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Model of CEL for 3D Elements in PDMs of Unidirectional Composite Structures

Qin¹,

Zhao²,

Xu³

et al. 2019

Computer Modeling in Engineering &Amp; Sciences

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Progressive damage models (PDMs) have been increasingly used to simulate the failure process of composite material structures. To accurately simulate the damage in each ply, 3D PDMs of composite materials have received more attention recently. A characteristic element length (CEL), which is an important dimensional parameter of PDMs for composite materials, is quite difficult to obtain for 3D elements, especially considering the crack directions during damage propagation. In this paper, CEL models for 3D elements in PDMs of unidirectional composite structures are presented, and their approximate formulae are deduced. The damage in unidirectional composite materials can be divided into fiber cracks and inter-fiber cracks. The fiber crack and inter-fiber crack directions are considered in the CEL derivations, and thus, the CELs of 3D elements that have various damage modes and damage directions could be obtained relatively precisely. Static tensile and compressive tests of open-hole laminates were conducted, and the corresponding numerical analyses by the progressive damage method, including the proposed CEL models and those models from the literature, were performed. The numerical results are in good agreement with the experimental results, which proves the fidelity and effectiveness of the proposed CEL models. In addition, the proposed CEL models have better performance in improving the mesh independence of the numerical models.

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Section: Pdmmentioning

confidence: 99%

“…The material degradation model is established under a local coordinate O-1'2'3' fixed to the cracks [Zhao, Qin, Zhang et al (2015)], as shown in Fig. 8.…”

Section: Materials Degradation Modelmentioning

confidence: 99%

Section: Materials Degradation Modelmentioning

confidence: 99%

mentioning

confidence: 99%

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Model of CEL for 3D Elements in PDMs of Unidirectional Composite Structures

Qin¹,

Zhao²,

Xu³

et al. 2019

Computer Modeling in Engineering &Amp; Sciences

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“…With the development of the finite element (FE) method, the continuum damage mechanics (CDM) modeling technique has proved to be an effective numerical method to investigate the failure process and ultimate strength of notched or bolted composite structures. [15][16][17][18][19][20][21] CDM assumes that material property degradation is governed by continuous damage variables. These damage variables are related to the mechanical aspects of the damage mechanism and the dissipation energy that is required for the evolution of the damage states.…”

Section: Introductionmentioning

confidence: 99%

Coupled continuum damage mechanics and failure envelope method for failure prediction of composite multi-bolt joints

2016

Journal of Reinforced Plastics and Composites

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A numerical strategy, based on continuum damage mechanics and the failure envelope method, is proposed for failure prediction of composite multi-bolt joints. First, the design parameters of the failure envelope are determined by virtual tests of simple structures. Then, a modified failure envelope incorporating the bending effect is constructed. Finally, different bearing-to-bypass stress ratios and the influence of bolt rows on the bending effect are discussed. It is shown that the failure envelope with constant bearing-to-bypass stress ratio, obtained by assuming uniform bolt load distribution, is recommended. And the bending effect of single-lap, composite multi-bolt joints is alleviated by the introduction of more bolt rows. These results indicate that failure prediction of composite multi-bolt joints, using the proposed numerical strategy, exhibits excellent agreement with the experimental outcomes. This demonstrates that the numerical strategy is feasible.

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Progressive Failure Analysis of Laminated CFRP Composites under Three-Point Bending Load

Shen

Liu

et al. 2022

Advances in Materials Science and Engineering

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In this paper, the mechanical behavior and damage evolution of CFRP laminates under three-point bending loads were investigated. Based on the three-dimensional Hashin failure criterion and cohesive zone method, a progressive damage analysis model was constructed to predict seven different failure modes, and an improved stiffness matrix degradation law was proposed. Numerical simulations were performed using ABAQUS finite element software and UMAT user subroutines and verified by three-point bending tests. The experimental results show that the relative errors of the flexural strength and flexural modulus of the current model simulation results and the experimental data were −3.10% and −2.70%, respectively, and the damage evolution process after the ultimate load was accurately predicted. Meanwhile, the predicted final failure and damage modes were consistent with the micrographs of the failed specimens.

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3D Gradual Material Degradation Model for Progressive Damage Analyses of Unidirectional Composite Materials

Cited by 7 publications

References 47 publications

Model of CEL for 3D Elements in PDMs of Unidirectional Composite Structures

Model of CEL for 3D Elements in PDMs of Unidirectional Composite Structures

Coupled continuum damage mechanics and failure envelope method for failure prediction of composite multi-bolt joints

Progressive Failure Analysis of Laminated CFRP Composites under Three-Point Bending Load

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