scholarly journals Damage Process Simulation of Damping Coating of Thin Plate

2011 ◽  
Vol 2-3 ◽  
pp. 739-742 ◽  
Author(s):  
Jing Yu Zhai ◽  
Hui Li ◽  
Qing Kai Han
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Elastic Modulus ◽  
Stress Intensity ◽  
Crack Length ◽  
Stress Intensity Factors ◽  
Process Simulation ◽  
Intensity Factors ◽  
Interface Elements ◽  
Damage Process

In this paper, the element birth and death technique is used to simulate the damping stripping process of damping coating, and the interface of substrate and damping coating is simulated by contact elements or interface elements. The stress intensity factors and crack length are also calculated based on finite element method under different thicknesses and elastic modulus The simulation could provide reference for the design and optimize of damping coating.

FEM Analysis of Stress Intensity Factors of Crack Tip

2014 ◽  
Vol 685 ◽  
pp. 224-227
Author(s):  
Jian Hui Liu ◽  
Sheng Nan Wang ◽  
Ya Bing Lu ◽  
Zong Zheng Huang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Intensity ◽  
Crack Length ◽  
Stress Intensity Factors ◽  
Empirical Formula ◽  
Fem Analysis ◽  
304 Stainless Steel ◽  
Intensity Factors ◽  
Element Method

Finite element method is used to analysis two-dimensional compact tension specimens which is made of 304 stainless steel and calculate stress intensity factors by J-integral. The effects of loading magnitude and crack length on stress intensity factors are analyzed. Meanwhile the errors between finite element method and empirical formula are considered. The results calculated by the finite element method and the results obtained with the empirical formula have a small difference and the error locates the allowable range. The results show that the stress intensity factors K1 and loading amplitude have a linear relationship and the relationship between stress intensity factors K1 and crack length is non-linear. The rate of crack extension would accelerate when the crack length increase.

A Coupled SBFEM-FEM Approach for Evaluating Stress Intensity Factors

2013 ◽  
Vol 353-356 ◽  
pp. 3369-3377 ◽  
Author(s):  
Ming Guang Shi ◽  
Chong Ming Song ◽  
Hong Zhong ◽  
Yan Jie Xu ◽  
Chu Han Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Complex Geometry ◽  
Stress Singularity ◽  
Intensity Factors ◽  
Finite Element Software ◽  
Scaled Boundary Finite Element ◽  
Element Method

A coupled method between the Scaled Boundary Finite Element Method (SBFEM) and Finite Element Method (FEM) for evaluating the Stress Intensity Factors (SIFs) is presented and achieved on the platform of the commercial finite element software ABAQUS by using Python as the programming language. Automatic transformation of the finite elements around a singular point to a scaled boundary finite element subdomain is realized. This method combines the high accuracy of the SBFEM in computing the SIFs with the ability to handle material nonlinearity as well as powerful mesh generation and post processing ability of commercial FEM software. The validity and accuracy of the method is verified by analysis of several benchmark problems. The coupled algorithm shows a good converging performance, and with minimum additional treatment can be able to handle more problems that cannot be solved by either SBFEM or FEM itself. For fracture problems, it proposes an efficient way to represent stress singularity for problems with complex geometry, loading condition or certain nonlinearity.

Sensitivity of Stress Intensity Factors with Respect to the Crack Geometry by the Scaled Boundary Finite Element Method

2014 ◽  
Vol 553 ◽  
pp. 737-742
Author(s):  
Morsaleen Shehzad Chowdhury ◽  
Chong Ming Song ◽  
Wei Gao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Shape Sensitivity ◽  
Intensity Factors ◽  
Element Discretization ◽  
Crack Geometry ◽  
Scaled Boundary Finite Element ◽  
Element Method

The sensitivity of the stress intensity factors (SIFs) with respect to the crack geometry, shape sensitivity, plays an important role in the reliability analysis of cracked structures and many other fracture mechanics applications. This paper presents a numerical technique to evaluate the shape sensitivity using the scaled boundary finite element method. It combines the finite element formulations with the boundary element discretization. The crack surface remains meshless. The variation in crack geometry is modelled by applying direct differentiation with respect to the crack geometry, without remeshing. The sensitivity of the stress modes are not required for the calculation of the sensitivity of the SIFs. A numerical example demonstrates the efficiency, accuracy and simplicity of the technique.

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