Comparative Study of Failure Models for Prediction of Mixed-Mode Failure Characteristics in Composite Adhesively Bonded Joint with Brittle/Quai-Brittle Adhesive Using Finite Element Analysis

2021 ◽  
pp. 102911
Author(s):  
Myong-Ho Kim ◽  
Un-Il Ri ◽  
Hyon-Sik Hong ◽  
Yong-Chol Kim
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mixed Mode ◽  
Adhesively Bonded ◽  
Element Analysis ◽  
Failure Characteristics ◽  
Bonded Joint ◽  
Failure Models ◽  
Adhesively Bonded Joint ◽  
Mode Failure

Normal Stress Distributions in a Single-Lap Adhesively Bonded Joint under Tension

2012 ◽  
Vol 530 ◽  
pp. 9-13 ◽  
Author(s):  
Xiao Cong He
Keyword(s):  
Finite Element ◽  
Normal Stress ◽  
High Stress ◽  
Three Dimensional ◽  
Adhesive Layer ◽  
Adhesively Bonded ◽  
Element Analysis ◽  
Normal Stress Distribution ◽  
Bonded Joint ◽  
Adhesively Bonded Joint

This paper investigates normal stress distribution of a single-lap adhesively bonded joint under tension using the three-dimensional finite element methods. Five layers of solid elements were used across the adhesive layer thickness in order to obtain an accurate indication of the variation of normal stress. All the numerical results obtained from the finite element analysis show that the spatial distribution of normal stress are similar for different interfaces though the stress values are obviously different. It can also be seen from the results that the left hand region, which is very close to the left free end of the adhesive layer, is subjected to very high stress and the magnitude of the normal stress oscillates in value close to the left end of the adhesive layer.

A Study on Normal Stress Distribution and Failure of Adhesively Bonded Joint under Cleavage Loading

2007 ◽  
Vol 348-349 ◽  
pp. 949-952 ◽  
Author(s):  
Xiao Ling Zheng ◽  
Ming Song Zhang ◽  
Min You ◽  
Hai Zhou Yu ◽  
Zhi Li
Keyword(s):  
Finite Element ◽  
Normal Stress ◽  
Pure Copper ◽  
Distribution Model ◽  
Strain Gauges ◽  
Adhesively Bonded ◽  
Element Analysis ◽  
Normal Stress Distribution ◽  
Bonded Joint ◽  
Adhesively Bonded Joint

The normal stress distributed in the mid-bondline of the adhesively bonded joint under cleavage loading was investigated using the elastic finite element method (FEM) and the strain gauges method to reveal the real normal stresses distribution in the metal-to-metal joint while the load was increased. The results from the finite element analysis (FEA) showed that there is always a peak stress of the normal stress Sy in the mid-bondline occurred at a point close to the loading pin axis. When the load was increased from 0.5 kN to 3 kN, there was also a point located at about x = 16mm along the length of specimen where there is without any normal stress at all. The result of stress Sy from the FEA is nearly the same as that one obtained from the strain gauges method. It was also found that there was a evidently hardness change in the bonded zone of the adherend made from structural steel or pure copper, which can be used to explain the procedure of the joint and discuss the distribution model of the normal stress Sy in the joint under the cleavage loading.

Nonlinear Viscoelastic Finite Element Analysis of Adhesive Joints

1988 ◽  
Vol 16 (3) ◽  
pp. 146-170 ◽  
Author(s):  
S. Roy ◽  
J. N. Reddy
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Viscoelastic Behavior ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Element Analysis ◽  
Adhesively Bonded Joints ◽  
Nonlinear Viscoelastic ◽  
Structural Failures ◽  
Updated Lagrangian

Abstract A good understanding of the process of adhesion from the mechanics viewpoint and the predictive capability for structural failures associated with adhesively bonded joints require a realistic modeling (both constitutive and kinematic) of the constituent materials. The present investigation deals with the development of an Updated Lagrangian formulation and the associated finite element analysis of adhesively bonded joints. The formulation accounts for the geometric nonlinearity of the adherends and the nonlinear viscoelastic behavior of the adhesive. Sample numerical problems are presented to show the stress and strain distributions in bonded joints.

Comparison of mixed mode fracture criteria in finite element analysis for matrix crack density estimation of laminated composites

2020 ◽  
Vol 55 (2) ◽  
pp. 277-289
Author(s):  
Mingqing Yuan ◽  
Haitao Zhao ◽  
Li Tian ◽  
Boming Zhang ◽  
Yanzhi Yang ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Density Estimation ◽  
Mixed Mode ◽  
Crack Density ◽  
Mode I ◽  
Mixed Mode Fracture ◽  
Fracture Criteria ◽  
Element Analysis ◽  
Mode Fracture

A mixed mode crack density estimation method based on the finite element analysis (FEA) for laminated composites is proposed and verified in this paper. The damaged properties of cracked ply are obtained using semi-analytical micro-mechanical method for the first time. The piecewise functions of the mode I and mode II energy release rates involving crack density are given based on Griffith’s energy principle and discrete damage mechanics (DDM). Any mixed mode fracture criteria could be simply applied to the FEA of the structure to calculate the initiation and evolution of the micro-cracks in the laminate. Mode I criterion, power law and B-K criterion are applied in the numerical examples to compare their performances in the crack density estimation. It has been concluded that the accuracy of the fracture toughness is more important than the choice of fracture criterion in crack density estimation.

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