A progressive damage simulation algorithm for GFRP composites under cyclic loading. Part II: FE implementation and model validation

2011 ◽  
Vol 71 (5) ◽  
pp. 750-757 ◽  
Author(s):  
Elias N. Eliopoulos ◽  
Theodore P. Philippidis
Keyword(s):  
Cyclic Loading ◽  
Model Validation ◽  
Progressive Damage ◽  
Simulation Algorithm ◽  
Gfrp Composites ◽  
Damage Simulation

Progressive Damage of Solder Joints: Modeling, Implementation and Verification

2006 ◽  
Author(s):  
Zhengfang Qian
Keyword(s):  
Cyclic Loading ◽  
Damage Evolution ◽  
Damage Mechanics ◽  
Mathematical Structure ◽  
Failure Criteria ◽  
Progressive Damage ◽  
Electronic Packages ◽  
Flip Chips ◽  
Bga Package ◽  
Virtual Qualification

This paper presents a damage mechanics-based methodology for the progressive damage and virtual qualification of advanced electronic packages such as BGAs, DCAs, CSPs, and Flip-chips. The key technique is to implement the material nonlinearity into commercially available software tools. A unified viscoplastic constitutive framework with the damage evolution and failure criteria has been successfully implemented into the ABAQUS® code to model time-rate-temperature dependent material properties. The framework has been successfully applied to solder alloys, polymer films, and underfill encapsulants. The mathematical structure and numerical algorithm development of the unified constitutive framework as well as the key implementation techniques for commercial FEA codes have been summarized in this paper. Both crack initiation and propagation of a solder joint with damage evolution under mechanical cyclic loading have been demonstrated. Virtual simulations of TSOP component failure under mechanical cyclic loading and BGA package under thermal cyclic loading have also been presented.

A computational approach with surface-based cohesive contact for meso-scale interface damage simulation in 3D braided composites

2020 ◽  
pp. 152808372098017
Author(s):  
Chao Zhang ◽  
Jianchun Liu ◽  
Tinh Quoc Bui ◽  
Jose L Curiel-Sosa ◽  
Jinzhong Lu
Keyword(s):  
Damage Evolution ◽  
Textile Composites ◽  
Interface Debonding ◽  
Progressive Damage ◽  
Fe Model ◽  
Matrix Interface ◽  
Braided Composites ◽  
3D Braided Composites ◽  
Damage Simulation ◽  
Meso Scale

The yarn/yarn and yarn/matrix interface debonding has been recognized as a vital failure mode of 3 D braided composites. We present in this paper a meso-scale finite element (FE) model, which considers yarn/yarn and yarn/matrix interface debonding, for modeling progressive damage evolution of 3 D braided composites under typical tensile and shear loadings. In this setting, the damage state of braiding yarns and matrix is described through a continuum damage model (CDM) coupled with Murakami damage tensor; a bilinear traction-separation description is employed to govern the yarn/yarn and yarn/matrix interface behavior modeled by surface-based cohesive contact. We thus develop a user-material subroutine VUMAT (ABAQUS/Explicit) for our progressive damage simulation, including stress analysis, failure analysis and material properties degradation scheme. The mechanical properties of 3 D braided composites, and more importantly the damage evolution of interface debonding are thoroughly analyzed. The proposed FE modeling strategy provides a new perspective for the interface response study of other textile composites.

Molecular Dynamics Study of Metal Fatigue Process

2004 ◽  
Author(s):  
Y. W. Kwon
Keyword(s):  
Molecular Dynamics ◽  
Cyclic Loading ◽  
Fatigue Failure ◽  
Damage Accumulation ◽  
Experimental Studies ◽  
Pure Metal ◽  
Atomic Level ◽  
Progressive Damage ◽  
Metal Fatigue ◽  
Fatigue Process

Molecular dynamics study was conducted to understand fatigue process in metals and to predict fatigue failure. As the first step, a pure metal like copper was considered for the study with defects at the atomic level such as vacancies or dislocations. The study was focused on identifying parameters which can provide indications of progressive damage accumulation in the material under cyclic loading. The results obtained by simulations were compared to macroscopic observations in the experimental studies

Sign in / Sign up

Export Citation Format

Share Document