Effects of residual stress on elastic plastic behavior of metallic glass bolts formed by cold thread rolling

Abstract Low plasticity burnishing (LPB) has been extensively employed in aero-industry to enhance fatigue performance of machined components by introducing compressive residual stress. Effects of various parameters on the residual stress field induced by low plasticity burnishing have been investigated by many researchers. However, initial residual stresses induced by machining are one of the important factors which affect the residual stress regenerated by the LPB process. The present work aims to develop an analytical model which takes into account the initial residual stress and burnishing parameters to predict residual stress field of workpiece material Inconel 718 based on Hertz contact theory and elastic–plastic theory. Initial residual stress fields were produced by turning of Inconel 718 and were measured by using X-ray diffraction technique. Two types of material constitutive models such as the linear hardening model and isotropic–kinematic model were employed to describe the elastic–plastic behavior of workpiece material Inconel 718. An analytical study was performed to analyze the effect of the initial residual stress field and burnishing parameters on residual stress induced by low plastic burnishing. The results of analytical model were verified by conducting the LPB experiments on initial turned Inconel 718. The results showed that the shape and magnitude of the residual stress field obtained with considering the effect of initial residual stress field was in good accordance with experimental measurements.

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Stress Analysis of SS316L Tube Die Expansion for High Pressure Gas Coolers

Volume 2: Computer Technology and Bolted Joints ◽

10.1115/pvp2020-21012 ◽

2020 ◽

Author(s):

Zijian Zhao ◽

Abdel-Hakim Bouzid

Keyword(s):

Residual Stress ◽

High Pressure ◽

Plastic Material ◽

Research Work ◽

Material Behavior ◽

Isotropic Hardening ◽

Plastic Behavior ◽

Expansion Process ◽

Elastic Plastic ◽

Stress States

Abstract SS316L finned tubes are becoming very popular in high-pressure gas exchangers and particularly in CO2 cooler applications. Due to the high-pressure requirement during operation, these tubes require an accurate residual stress evaluation during the expansion process. Indeed, die expansion of SS tubes creates not only high stresses when combined with operation stresses but also micro-cracks during expansion when the expansion process is not very well controlled. This research work aims at studying the elastic-plastic behavior and estimating the residual stress states by modeling the die expansion process. The stresses and deformations of the joint are analyzed numerically using the finite element method. The expansion and contraction process is modeled considering elastic-plastic material behavior for different die sizes. The maximum longitudinal, tangential and contact stresses are evaluated to verify the critical stress state of the joint during the expansion process. The importance of the material behavior in evaluating the residual stresses using kinematic and isotropic hardening is addressed.

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Effect of material's behavior on residual stress distribution in elastic–plastic beam bending: An analytical solution

Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications ◽

10.1177/1464420715597953 ◽

2015 ◽

Vol 231 (4) ◽

pp. 361-372 ◽

Cited By ~ 4

Author(s):

Jalal Joudaki ◽

Mohammad Sedighi

Keyword(s):

Residual Stress ◽

Finite Element ◽

Stress Distribution ◽

Residual Stress Distribution ◽

Material Behavior ◽

Plastic Behavior ◽

Element Analysis ◽

Elastic Plastic ◽

Bending Radius ◽

Beam Bending

A considerable residual stress distribution can be produced while bending of parts. This stress distribution depends on material behavior. In this article, residual stress distribution has been determined through the thickness in beam bending. For three different models of elastic–plastic behavior, the stress distribution and maximum residual stress are derived analytically. The residual stress is compared for three different bending radii as a case study. Also, finite element analysis has been carried out for two material properties. The results show that material behavior has little effect on stress distribution for large value of bending radius. As the bending radius decreases, difference of stress distribution increases rapidly among three plastic behaviors. Comparing the results of finite element and analytical stress distribution shows good accuracy for suggested formulations.

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Elastic-plastic behavior of coldworked holes

10.2514/6.1983-865 ◽

1983 ◽

Cited By ~ 1

Author(s):

H. ARMEN ◽

A. LEVY ◽

H. EIDINOFF

Keyword(s):

Plastic Behavior ◽

Elastic Plastic

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Effect of Defect on Elastic/Plastic and Creep Behavior of Bone: A Finite Element Study

ASME 2007 Summer Bioengineering Conference ◽

10.1115/sbc2007-175843 ◽

2007 ◽

Author(s):

A. Ajdari ◽

P. K. Canavan ◽

H. Nayeb-Hashemi ◽

G. Warner

Keyword(s):

Mechanical Properties ◽

Finite Element ◽

Trabecular Bone ◽

Fatigue Loading ◽

Dimensional Structure ◽

Plastic Behavior ◽

Element Analysis ◽

Elastic Plastic ◽

Local Bone ◽

Osteoporotic Vertebral Fractures

Three-dimensional structure of trabecular bone can be modeled by 2D or 3D Voronoi structure. The effect of missing cell walls on the mechanical properties of 2D honeycombs is a first step towards understanding the effect of local bone resorption due to osteoporosis. In patients with osteoporosis, bone mass is lost first by thinning and then by resorption of the trabeculae [1]. Furthermore, creep response is important to analyze in cellular solids when the temperature is high relative to the melting temperature. For trabecular bone, as body temperature (38 °C) is close to the denaturation temperature of collagen (52 °C), trabecular bone creeps [1]. Over the half of the osteoporotic vertebral fractures that occur in the elderly, are the result of the creep and fatigue loading associated with the activities of daily living [2]. The objective of this work is to understand the effect of missing walls and filled cells on elastic-plastic behavior of both regular hexagonal and non-periodic Voronoi structures using finite element analysis. The results show that the missing walls have a significant effect on overall elastic properties of the cellular structure. For both regular hexagonal and Voronoi materials, the yield strength of the structure decreased by more than 60% by introducing 10% missing walls. In contrast, the results indicate that filled cells have much less effect on the mechanical properties of both regular hexagonal and Voronoi materials.

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Thermal Annealing Effect on Elastic-Plastic Behavior of Al-Si-Cu Structural Films Under Uniaxial and Biaxial Tension

Journal of Microelectromechanical Systems ◽

10.1109/jmems.2013.2257985 ◽

2013 ◽

Vol 22 (6) ◽

pp. 1414-1427 ◽

Cited By ~ 7

Author(s):

Takahiro Namazu ◽

Masayuki Fujii ◽

Hiroki Fujii ◽

Kei Masunishi ◽

Yasushi Tomizawa ◽

...

Keyword(s):

Thermal Annealing ◽

Biaxial Tension ◽

Annealing Effect ◽

Plastic Behavior ◽

Elastic Plastic

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Load Regime Diagram of a Pipe With Cyclically Plastic Bending

10th International Conference on Nuclear Engineering, Volume 1 ◽

10.1115/icone10-22100 ◽

2002 ◽

Author(s):

Yanping Yao ◽

Ming-Wan Lu

Keyword(s):

Axial Force ◽

Bending Moment ◽

Boundary Curve ◽

Plastic Behavior ◽

Cyclic Bending ◽

Elastic Plastic ◽

Linear Elastic ◽

Load Regime ◽

Reversed Cyclic ◽

Cyclic Bending Moment

The criteria of piping seismic design based on linear elastic analysis has been proved to be conservative, which is mainly because the influence of plastic deformation on piping dynamic response is neglected. In the present paper, a pipe under seismic excitation is simplified as an beam with tubular cross section subjected to steady axial force and fully reversed cyclic bending moment, and the elastic-plastic behavior of the pipe is studied. Various behavior of the pipe under different combinations of axial force and cyclic bending moment is discussed and the boundary curve equations between them are obtained. Also the load regime diagram for a pipe which is formed by the boundary curve equations in the loading plane is given, from which the elastic-plastic behavior of the pipe can be determined directly.

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