Experimental and numerical analysis of progressive damage and failure behavior of carbon Woven-PPS

2020 ◽  
Vol 243 ◽  
pp. 112234
Author(s):  
Leila Jebri ◽  
Fethi Abbassi ◽  
Murat Demiral ◽  
Mohamed Soula ◽  
Furqan Ahmad
Keyword(s):  
Numerical Analysis ◽  
Failure Behavior ◽  
Progressive Damage ◽  
Damage And Failure

scholarly journals Numerical analysis of stress-state-dependent damage and failure behavior of ductile steel based on biaxial experiments

2020 ◽  
Author(s):  
Michael Brünig ◽  
Marco Schmidt ◽  
Steffen Gerke
Keyword(s):  
Stress State ◽  
Numerical Analysis ◽  
Numerical Model ◽  
Evolution Equations ◽  
Image Correlation ◽  
Failure Behavior ◽  
Damage And Failure ◽  
State Dependent ◽  
Ductile Steel ◽  
Biaxial Experiments

Abstract The paper deals with a numerical model to investigate the influence of stress state on damage and failure in the ductile steel X5CrNi18-10. The numerical analysis is based on an anisotropic continuum damage model taking into account yield and damage criteria as well as evolution equations for plastic and damage strain rate tensors. Results of numerical simulations of biaxial experiments with the X0- and the H-specimen presented. In the experiments, formation of strain fields are monitored by digital image correlation which can be compared with numerically predicted ones to validate the numerical model. Based on the numerical analysis the strain and stress quantities in selected parts of the specimens are predicted. Analysis of damage strain variables enables prediction of fracture lines observed in the tests. Stress measures are used to explain different stress-state-dependent damage and failure mechanisms on the micro-level visualized on fracture surfaces by scanning electron microscopy.

scholarly journals Biaxial Experiments and Numerical Analysis on Stress-State-Dependent Damage and Failure Behavior of the Anisotropic Aluminum Alloy EN AW-2017A

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1214
Author(s):  
Michael Brünig ◽  
Steffen Gerke ◽  
Sanjeev Koirala
Keyword(s):  
Aluminum Alloy ◽  
Stress State ◽  
Numerical Analysis ◽  
Image Correlation ◽  
Experimental Program ◽  
Failure Behavior ◽  
Strain Fields ◽  
Damage And Failure ◽  
Damage And Fracture ◽  
Loading Direction

Many experiments indicated the remarkable dependence of the strength and failure behavior of anisotropic ductile metals on the loading direction and on the stress state. These influences have to be taken into account in accurate material models and in the numerical simulation of complex loading processes predicting the safety and lifetime of aerospace structures. Therefore, the present paper discusses the effect of loading direction and stress state on the damage and failure behavior of the anisotropic aluminum alloy EN AW-2017A. Experiments and corresponding numerical analysis with the newly developed, biaxially loaded X0 specimen have been performed and the influence of different load ratios is examined. The formation of strain fields in critical parts of the X0 specimen is monitored by digital image correlation. Different failure modes are visualized by scanning electron microscopy of fracture surfaces. Stress states are predicted by finite element calculations and they are used to explain damage and fracture processes at the micro-level. The experimental–numerical analysis shows that the loading direction and the stress state remarkably affect the evolution of the width and orientation of localized strain fields as well as the formation of damage processes and fracture modes. As a consequence, characterization of anisotropic metals is highly recommended to be based on an enhanced experimental program with biaxial tests including different load ratios and loading directions.

Three-dimensional progressive damage and failure analysis of double-lap composite bolted joints under quasi-static tensile loading

2022 ◽  
pp. 115227
Author(s):  
Jianxia Wang ◽  
Tianliang Qin ◽  
Narasimha Rao Mekala ◽  
Yujun Li ◽  
Mohammad Heidari-Rarani ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Three Dimensional ◽  
Tensile Loading ◽  
Bolted Joints ◽  
Progressive Damage ◽  
Damage And Failure ◽  
Static Tensile Loading ◽  
Static Tensile

scholarly journals Numerical analysis of the compressive and shear failure behavior of rock containing multi-intermittent joints

2019 ◽  
Vol 347 (1) ◽  
pp. 33-48 ◽  
Author(s):  
Xiang Fan ◽  
Hang Lin ◽  
Hongpeng Lai ◽  
Rihong Cao ◽  
Jie Liu
Keyword(s):  
Numerical Analysis ◽  
Shear Failure ◽  
Failure Behavior

scholarly journals Thermal Mismatch Effect and High-Temperature Tensile Performance Simulation of Hybrid CMC and Superalloy Bolted Joint by Progressive Damage Analysis

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Shuyuan Zhao ◽  
Jianglong Dong ◽  
Chao Lv ◽  
Zhengyu Li ◽  
Xinyang Sun ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
High Temperature ◽  
Transportation Systems ◽  
Bolted Joints ◽  
Failure Behavior ◽  
Progressive Damage ◽  
Damage Analysis ◽  
New Findings ◽  
Tensile Performance ◽  
High Temperature Tensile

The hybrid CMC and superalloy bolted joints have exhibited great potential to be used as thermostructural components of reusable space transportation systems, given the respective strengths of these two materials. In the high temperature excursion of the hybrid joints with the aircrafts and space vehicles, the substantial difference in thermal expansion coefficients of CMC and superalloy materials will induce complex superposition of initial assembly stress, thermal stress, and tensile stress around fastening area, which might lead to unknown failure behavior of joint structure. To address this concern, a finite element model embedded with progressive damage analysis was established to simulate the thermostructural behavior and high-temperature tensile performance of single-lap, single-bolt C/SiC composite and superalloy joint, by using the ABAQUS software. It was found that the initial stiffness of the CMC/superalloy hybrid bolted joints decreases with the rise of applied temperature under all bolt-hole clearance levels. However, the load-bearing capacity varies significantly with the initial clearance level and exposed temperature for the studied joint. The thermal expansion mismatch generated between the CMC and superalloy materials led to significant changes in the assembly preload and bolt-hole clearance as the high-temperature load is applied to the joint. The evolution in the thermostructural behavior upon temperature was then correlated with the variations in stiffness and failure load of the joints. The provided new findings are valuable for structural design and practical application of the hybrid CMC/superalloy bolted joints at high temperatures in next-generation aircrafts.

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