Finite Element Simulation Technique for Evaluation of Opening Stresses Under High Plasticity

2020 ◽  
Author(s):  
Ans Al Rashid ◽  
Ramsha Imran ◽  
Muhammad Yasir Khalid
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Mechanical Behavior ◽  
Finite Element Simulation ◽  
Simulation Technique ◽  
High Plasticity ◽  
Element Analysis ◽  
Element Simulation ◽  
Stress Levels

Abstract The mechanical behavior of materials plays a vital role in the structural performance of designed structures. Therefore, significant resources are devoted globally towards experimental characterization of material behavior, especially for the experiments requiring particular protocols. Contrary, finite element analysis tools have made a substantial contribution to the design of structural elements, which could conserve a significant amount of resources and material wastage. Evaluation of fatigue life of materials is necessary to predict the life expectancy of the structures precisely, and opening stress levels under fatigue loading contributes towards this evaluation. Railways serve as freight and passenger carrier transportation modes. The railway axles contribute as the primary load-carrying element; therefore, the design of railway axles and the study of their mechanical behavior under repeated loading is vital. In this study, the authors present a finite element simulation technique to evaluate the opening stress levels for two structural steels subjected to low cycle fatigue. The finite element analysis (FEA) model was designed and validated following the simulation of fatigue crack propagation under high plasticity conditions. Numerical simulation results were compared with the experimental results obtained earlier through the digital image correlation (DIC) technique. To conclude, FEA could be a useful tool to predict crack closure phenomena and, ultimately, the fatigue life of components. However, researchers need to establish more sophisticated numerical tools for more precise results in case of high plasticity conditions near the crack tip.

scholarly journals Mechanical behavior of ballasted railway track stabilized with polyurethane: A finite element analysis

2018 ◽  
Vol 251 ◽  
pp. 04056 ◽  
Author(s):  
Zelimkhan Khakiev ◽  
Alexander Kruglikov ◽  
Georgy Lazorenko ◽  
Anton Kasprzhitskii ◽  
Yakov Ermolov ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Finite Element Simulation ◽  
Elasticity Modulus ◽  
Railway Track ◽  
Binding Agent ◽  
Element Analysis ◽  
Linear Elastic ◽  
Element Simulation

Analysis of mechanical behavior of ballast shoulder of railway track reinforced by polyurethane binding agent has been performed by the method of finite-element simulation Limitation of the model of linear-elastic properties of geocomposite has been displayed. Dependence of elasticity modulus of geocomposite on deformation value has been suggested. Influence of penetration depth of polyurethane binding agent on behavior of railway track construction under different train loads has been studied.

Finite element simulation technique for evaluation of opening stresses under high plasticity

2021 ◽  
pp. 1-21
Author(s):  
Ans Al Rashid ◽  
Ramsha Imran ◽  
Zia Ullah Arif ◽  
Muhammad Yasir Khalid
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Finite Element Simulation ◽  
Crack Closure ◽  
Low Cycle Fatigue ◽  
Simulation Technique ◽  
Experimental Results ◽  
High Plasticity ◽  
Cycle Fatigue ◽  
Element Simulation

Abstract The crack closure phenomenon is important to study as it estimates the fatigue life of the components. It becomes even more complex under low cycle fatigue (LCF) since under LCF high amount of plasticity is induced within the material near notches or defects. As a result, the assumptions used by the linear elastic fracture mechanics (LEFM) approach become invalid. However, several experimental techniques are reported on the topic, the utilization of numerical tools can provide substantial cost and time-saving. In this study, the authors present a finite element simulation technique to evaluate the opening stress levels for two structural steels (25CrMo4 and 30NiCrMoV12) under low cycle fatigue conditions. The LCF experimental results were used to obtain kinematic hardening parameters through the Chaboche model. The finite element analysis (FEA) model was designed and validated, following the fatigue crack propagation simulation under high plasticity conditions using ABAQUS. Crack opening displacement vs. stress data was exported from ABAQUS, and 1.5% offset method was employed to define opening stress levels. Numerical simulation results were compared with the experimental results obtained earlier through the digital image correlation (DIC) technique. To conclude, FEA could be a valuable tool to predict crack closure phenomena and, ultimately, the fatigue life of components. However, analysis of opening stresses using crystal plasticity models or extended finite element method (XFEM) tools should be explored for a better approximation in future studies.

scholarly journals EXPERIMENTAL AND FINITE ELEMENT ANALYSIS OF NONAXISYMMETRIC STRETCH FLANGING PROCESS USING AA 5052

2021 ◽  
Author(s):  
Sachin Kumar Nikam ◽  
◽  
Sandeep Jaiswal ◽  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Sheet Metal ◽  
Element Analysis ◽  
Maximum Percentage ◽  
Element Simulation ◽  
Stretch Flanging ◽  
Explicit Dynamic ◽  
Mesh Convergence

This paper deals with experimental and finite element analysis of the stretch flanging process using AA- 5052 sheets of 0.5 mm thick. A parametrical study has been done through finite element simulation to inspect the influence of procedural parametrical properties on maximum thinning (%) within the stretch flanging process. The influence of preliminary flange length of sheet metal blank, punch die clearance, and width was examined on the maximum thinning (%). An explicit dynamic finite element method was utilized using the finite element commercial package ABAQUS. Strain measurement was done after conducting stretch flanging tests. A Mesh convergence examination was carried out to ascertain the maximum percentage accuracy in FEM model. It is found through finite element simulation that the width of sheet metal blanks has a greater impact on the maximum percentage of thinning as compared to preliminary flange length, and clearance of the punch dies.

Technology of Finite Element Analysis for Roll Forming Process

2014 ◽  
Vol 941-944 ◽  
pp. 1832-1835
Author(s):  
Xue Feng Peng ◽  
Jing Tao Han ◽  
Jing Liu ◽  
Pei Jie Yan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Computer Aided Design ◽  
Current Status ◽  
Roll Forming ◽  
Forming Process ◽  
Element Analysis ◽  
Element Simulation ◽  
Roll Forming Process

With deepening of roll forming technology and the proficiency of computer aided design and finite element Analysis (FEA) technology, it is widely noted that using the technology of FEA to simulate the roll forming process. In this paper, the current status of finite element simulation for roll forming process at home and abroad is summarized. And the finite element theories of deformation zone in roll forming process are analyzed. The new issues on roll forming process faced by finite element simulation, including advanced high strength steel (AHSS), multipass heterosexual cross section and coupling thermo-mechanical-metallurgical (TMM) coupling etc. are discussed. Moreover, the future trends of numerical simulation about the roll forming process are forecasted.

Research on the Parametric Varying Mechanism and Modeling of Accelerometer in Storage Condition

2011 ◽  
Vol 215 ◽  
pp. 305-309
Author(s):  
Y.X. Chen ◽  
F.L. Deng ◽  
D. Xu ◽  
Rui Kang
Keyword(s):  
Magnetic Material ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Magnetic Properties ◽  
Finite Element Modeling ◽  
Finite Element Simulation ◽  
Output Voltage ◽  
Storage Condition ◽  
Element Analysis ◽  
Element Simulation

Based on the study of the effect of parametric variation of quartz flexible accelerometer in storage condition, the varying mechanism and causes of bias and scale factor varying were analyzed. According to the analysis results of mechanism, the parts of finite element modeling and the parameters-input forms were determined. Considering the varying magnetic properties of permanent magnetic material impacted on the accelerometer, an approach of loading the servo-circuit formulas and modeling the quartz flexible accelerometer in ANSYS finite element analysis (FEA) software was given, and the algorithm process of FEA coupled magneto-structural simulation was also given. Finally, one certain accelerometer was simulated by FEA software, and a temperature testing was made. It is tested that the trend of the test under various temperature stress was consistent with that of the above output voltage values which is obtained by finite element simulation. Moreover, it demonstrates the correctness of the modeling and the analysis results.

Finite Element Analysis of the Base of the Auxiliary Supporting Equipment of the Self-Propelled Road Header Based on ANSYS

2012 ◽  
Vol 619 ◽  
pp. 147-150
Author(s):  
Li Jun Luan ◽  
Jian Feng Qi ◽  
Mu Jia Ma ◽  
Xin Yue Gu ◽  
Li Ze Yao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Simulation Method ◽  
The Self ◽  
Ansys Software ◽  
Accurate Analysis ◽  
Element Analysis ◽  
Element Simulation ◽  
Simulation Calculation

Through the static analysis of the base of the auxiliary supporting equipment of the self-propelled road header, by ANSYS software base are static finite element simulation calculation. The finite element simulation method in the research that the move of roadheader auxiliary support base on the reliability of the static equipment is Reliability and accuracy. For accurate analysis self-advance of roadheader auxiliary support equipment of static base provides an efficient way

Finite Element Simulation of Indentation Behavior of thin Films

1991 ◽  
Vol 239 ◽  
Author(s):  
D. T. Madsen ◽  
R. J. Giovinazzo ◽  
J. E. Ritter
Keyword(s):  
Thin Films ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Compliant Coating ◽  
Element Analysis ◽  
Plastic Properties ◽  
Element Simulation ◽  
Pile Up ◽  
Measured Hardness

ABSTRACTNanoindentation experiments are now widely used to study the elastic and plastic properties of thin films. Simulation of these experiments has been performed using finite element analysis. Results show the large influence that pile-up or sink-in behavior have on hardness calculations. Results also show that a compliant substrate significantly affects the measured hardness of a stiffer coating. The measured hardness of a compliant coating is less effected by a stiffer substrate.

Finite Element Simulation for Bolted Flange Joints Assembly With Misalignment

2009 ◽  
Author(s):  
Takashi Konnai ◽  
Hirokazu Tsuji ◽  
Yasumasa Shoji
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Finite Element Simulation ◽  
Bending Moment ◽  
Acceptance Criteria ◽  
Element Analysis ◽  
Ring Type ◽  
Element Simulation ◽  
Bolted Flange

JIS B 2251 (former HPIS Z 103 TR) is published as the assembly guidelines for bolted flanged joints with ring-type gasket, which employs the rotational clockwise tightening sequence in the main tightening step. Actual flanged joints have misalignment, and when the flanged joints are assembled, the bending moment to modify the influence of the misalignment acts on the flange faces. There is risk that the uniformity of gasket stress distribution is affected by the bending moment of the misalignment. So, the influence of the misalignment on the uniformity of the gasket stress distribution is investigated using finite element analysis. Consequently, setting the acceptance criteria of the misalignment to get the uniformity of gasket stress distribution. The influence of the uniformity of the gasket stress distribution in case of changing the starting tightening bolt against the direction of the misalignment is also investigated.

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