A novel 3D-FDEM method using finite-thickness cohesive elements to simulate the nonlinear mechanical behaviors of rocks

2021 ◽  
Vol 140 ◽  
pp. 104478
Author(s):  
Yang Ye ◽  
Jianwu Ma ◽  
Zhijun Wu ◽  
Yawu Zeng
Keyword(s):  
Finite Thickness ◽  
Mechanical Behaviors ◽  
Cohesive Elements ◽  
Nonlinear Mechanical

A SENSITIVITY ANALYSIS FOR BREAST DISPLACEMENT BY VARYING MATERIAL PROPERTIES

2015 ◽  
Vol 15 (01) ◽  
pp. 1550018
Author(s):  
ATEFEH AGHAJANI ◽  
MAHAN RAHIMI ◽  
MOHAMMAD HAGHPANAHI
Keyword(s):  
Finite Element Analysis ◽  
Sensitivity Analysis ◽  
Material Properties ◽  
Three Dimensional ◽  
Magnetic Resonance Images ◽  
Mechanical Parameters ◽  
Mechanical Behaviors ◽  
Element Analysis ◽  
Linear Elastic ◽  
Nonlinear Mechanical

In the quasi-static ultrasound breast elastography, the simulated displacement greatly influence the results. The breast modeling requires certain mechanical parameters for generating the simulated displacements. However, there are wide ranges of data in the existing literature for the breast mechanical parameters. Therefore, the sensitivity analysis of displacement to the changes of mechanical parameters worths a particular attention. In this paper we construct a three-dimensional (3D) breast model using magnetic resonance images. The constitutive equations corresponding to both linear elastic and hyperelastic (nonlinear) mechanical behaviors are considered. Then, two series of finite element analysis are performed in order to investigate how the changes of mechanical parameters of the fat and fibroglandular tissues may influence the displacement. The obtained results demonstrate that the displacement are generally less sensitive in the hyperelastic modeling (to the changes of material properties) than they are in the linear elastic modeling. Furthermore, the breast deformation is more influenced by the changes of material properties of fat part than the fibroglandular part.

Propagation of Lamb Waves in a Pre-Stressed Plate

2011 ◽  
Vol 66-68 ◽  
pp. 413-418 ◽  
Author(s):  
Jie Liu ◽  
Jin Xiong Zhou
Keyword(s):  
Surface Wave ◽  
Dispersion Relation ◽  
Closed Form ◽  
Lamb Wave ◽  
Decomposition Method ◽  
Lamb Waves ◽  
Finite Thickness ◽  
Helmholtz Decomposition ◽  
Mechanical Behaviors ◽  
Novel Approach

A novel approach is presented to solve the propagation of Lamb wave in a pre-stressed plate with finite thickness, where the commonly used Helmholtz decomposition method fails to find the solution. By using the proposed approach, some important relations of Lamb wave such as the dispersion relation can be obtained and analyzed in closed form, and the effects of initial stress are discussed in details. The method presented herein can be developed further to study the mechanical behaviors of other surface wave acoustic devices.

A multiscale discrete-continuum mosaic method for nonlinear mechanical behaviors of periodic micro/nano-scale structures

2021 ◽  
Vol 93 ◽  
pp. 376-394
Author(s):  
Xiangyang Wang ◽  
Huibo Qi ◽  
Zhongyu Sun ◽  
Junying Bi ◽  
Lifen Hu ◽  
...  
Keyword(s):  
Mechanical Behaviors ◽  
Nano Scale ◽  
Nonlinear Mechanical ◽  
Scale Structures

Finite-thickness cohesive elements for modeling thick adhesives

2016 ◽  
Vol 168 ◽  
pp. 105-113 ◽  
Author(s):  
Carlos Sarrado ◽  
Frank A. Leone ◽  
Albert Turon
Keyword(s):  
Finite Thickness ◽  
Cohesive Elements

Numerical Investigation of Transverse Tensile Behaviors of Marine Composites under Different Strain Rates

2013 ◽  
Vol 774-776 ◽  
pp. 944-948 ◽  
Author(s):  
Ang Qiu ◽  
You Hong Tang ◽  
Cheng Bi Zhao ◽  
Wei Lin
Keyword(s):  
Local Stress ◽  
Simulation Method ◽  
Strain Rates ◽  
Matrix Interface ◽  
Mechanical Behaviors ◽  
Cohesive Elements ◽  
Transverse Tensile ◽  
Static Conditions ◽  
Marine Composite ◽  
Fibre Matrix

In this study, the local stress of unidirectional fiber reinforced marine composites under transverse direction tension is conducted by using a representative volume element (RVE). With the application of fracture mechanics theory, the strength and debonding evolution of the fibre-matrix interface is analyzed and simulated by cohesive elements in FEA. The modeling results fit the experimental results in quasi-static conditions well, which demonstrates a proper simulation method for assessing the transverse mechanical properties of marine composites. Considering the complex work environment in ocean, transverse mechanical behaviors of marine composites under different strain rates is investigated, which would provide guidance for the marine composite designers.

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