Residual stress and strain distribution anomalies in TiN films deposited by physical vapor deposition

1990 ◽  
Vol 42 (1) ◽  
pp. 49-68 ◽  
Author(s):  
A.J. Perry ◽  
M. Jagner ◽  
W.D. Sproul ◽  
P.J. Rudnik
Keyword(s):  
Residual Stress ◽  
Vapor Deposition ◽  
Strain Distribution ◽  
Physical Vapor Deposition ◽  
Stress And Strain ◽  
Tin Films ◽  
Stress And Strain Distribution

Numerical Simulation on Two-Step Isothermal Glass Lens Molding

2010 ◽  
Vol 126-128 ◽  
pp. 564-569 ◽  
Author(s):  
Shao Hui Yin ◽  
Ke Jun Zhu ◽  
Yu Fang Wang ◽  
Feng Jun Chen ◽  
Yu Wang
Keyword(s):  
Residual Stress ◽  
Strain Distribution ◽  
High Efficiency ◽  
Stress And Strain ◽  
Key Factors ◽  
Molding Process ◽  
Element Simulation ◽  
Glass Lens ◽  
Lens Molding ◽  
Stress And Strain Distribution

Glass lens molding is an effective approach to produce precision micro aspheric glass lens at high efficiency. In this paper, a new two-step isothermal glass molding process was proposed. The mechanisms of new molding process were analyzed. Finite element simulation was conducted to analyze the key factors such as the pressing load, die damage, molding time and residual stress of lens during the traditional molding and the two-step isothermal molding. The results showed that the two-step isothermal glass lens molding process may decrease residual stress and improve stress and strain distribution. Furthermore, prolong the service life of die.

Effect of annealing on the residual stress and strain distribution in CdZnTe wafers

2007 ◽  
Vol 305 (1) ◽  
pp. 50-54 ◽  
Author(s):  
Dongmei Zeng ◽  
Wanqi Jie ◽  
Gangqiang Zha ◽  
Tao Wang ◽  
Ge Yang
Keyword(s):  
Residual Stress ◽  
Strain Distribution ◽  
Stress And Strain ◽  
Stress And Strain Distribution

scholarly journals Experimental and Numerical Study of NACA and Conventional Riveting Procedure

2017 ◽  
Vol 2017 (9) ◽  
pp. 157-170 ◽  
Author(s):  
Wojciech Wronicz ◽  
Jerzy Kaniowski ◽  
Maciej Malicki ◽  
Paweł Kucio ◽  
Robert Klewicki
Keyword(s):  
Residual Stress ◽  
Strain Distribution ◽  
Numerical Study ◽  
Fatigue Behaviour ◽  
Fatigue Properties ◽  
Stress And Strain ◽  
Hole Expansion ◽  
Strain Gauge Measurements ◽  
Stress And Strain Distribution ◽  
Numerical Approaches

AbstractFatigue behaviour is one of the most important properties of modern airplanes and rivets influence it strongly. According to the literature, the NACA riveting offers a multiple increase in the fatigue life of joints.The aim of this paper is to investigate the benefits offered by the NACA riveting procedure with respect to the residual stress and strain distribution after riveting as well as rivet hole expansion. Experimental and numerical approaches were adopted. The conventional riveting with both the universal and countersunk rivets was compared with the NACA riveting. The countersunk angle and depth in the case of the NACA riveting was modified somewhat relative to the values met in the literature. For these three cases, strain gauge measurements during riveting, hole expansion measurements and FE calculations were performed. The hole expansion measurement with the use of Computer Tomography(CT) was proposed.Only the FE calculations unambiguously indicate better fatigue properties of the NACA riveting. The proposed method of hole expansion measurement requires further research to increase its accuracy.

Effect of pipe expansion on the redistribution of residual stresses after molding

2020 ◽  
Vol 10 (2) ◽  
pp. 122-126
Author(s):  
Nikolay A. Makhutov ◽  
◽  
Dmitry A. Neganov ◽  
Eugeny P. Studenov ◽  
◽  
...  
Keyword(s):  
Residual Stresses ◽  
Strain Distribution ◽  
Strain State ◽  
Stress And Strain ◽  
Cylindrical Shape ◽  
Pipe Material ◽  
Pipe Expansion ◽  
Calculation Results ◽  
Residual Deformations ◽  
Stress And Strain Distribution

In the factory, pipes for trunk oil and oil product pipelines are obtained by molding and welding. To ensure a cylindrical shape and reduce technological residual stresses, expansion technology is used. Pipe expansion causes a significant change in the values of residual deformations and stresses. The article presents both the calculation results and graphs regarding stress and strain distribution during bending of the stock and their redistribution after expansion. Based on the calculation results, the final total values of residual stresses and residual deformations caused by bending and expansion were stated to be important components of the stress-strain state observed in pipelines being operated under cyclic loading, as well as those used in assessing how degradation affects the ductility of the pipe material. These factors were concluded as being reasonably taken into account when performing verification calculations regarding long-running pipelines if, based on their diagnostics and analysis, their state does not meet modern strength requirements.

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