Residual stresses and strains in molded plastics

1952 ◽  
Vol 7 (3) ◽  
pp. 244-252 ◽  
Author(s):  
W.H Markwood ◽  
H.M Spurlin
Keyword(s):  
Residual Stresses ◽  
Residual Stresses And Strains

Loading and Heating of a Simple Structure with Linear Work Hardening

1963 ◽  
Vol 67 (626) ◽  
pp. 92-102 ◽  
Author(s):  
E. H. Mansfield
Keyword(s):  
Residual Stresses ◽  
Work Hardening ◽  
Heat Load ◽  
Simple Structure ◽  
Tangent Modulus ◽  
Plastic Range ◽  
Repeated Applications ◽  
Residual Stresses And Strains

Summary:An analysis is made of the stresses and strains in a loaded two-bar tie when one of the bars is subjected to heating. The material of the bars is assumed to possess linear work hardening characteristics, i.e. a constant tangent modulus in the plastic range, and these characteristics are assumed to be independent of temperature. The following cycles of loading and heating are considered: load-heat-cool-unload, load-heat-unload-cool, heat-load-unload-cool, heat-load-cool-unload, and it is shown how, and when, these cycles produce differing stresses and strains and, in particular, differing residual stresses and strains. The effect of repeated applications of these cycles, when incremental shake-down may occur, is also considered.

Influence of residual stresses and strains generated by cold drawing on hydrogen embrittlement of prestressing steels

2007 ◽  
Vol 49 (9) ◽  
pp. 3557-3569 ◽  
Author(s):  
J. Toribio ◽  
V. Kharin ◽  
D. Vergara ◽  
J.A. Blanco ◽  
J.G. Ballesteros
Keyword(s):  
Hydrogen Embrittlement ◽  
Residual Stresses ◽  
Cold Drawing ◽  
Residual Stresses And Strains

Residual Stress of Gear Meshing under Shakedown Condition with Direct Analysis

2012 ◽  
Vol 152-154 ◽  
pp. 877-882
Author(s):  
Yuan Yuan ◽  
Peng Fei Li ◽  
Kai Liu
Keyword(s):  
Mathematical Model ◽  
Residual Stress ◽  
Residual Stresses ◽  
Direct Method ◽  
Direct Analysis ◽  
Numerical Approach ◽  
Operating Life ◽  
Operator Split ◽  
Gear Contact ◽  
Residual Stresses And Strains

A shakedown mathematical model of gear contact has been developed. A direct method is applied to solve the mathematical model. Local coordinates are constructed on different meshing points because curvature of gear profile is not constant. Distributions of residual stresses and strains are given base on variable curvature surface. The numerical approach consists of an operator split technique, which transforms the elastic-plastic problem into a purely elastic problem and a residual problem with prescribed eigenstrains. The eigenstrains are determined using an incremental projection method. Contact stresses and contact residual stresses of meshing gear teeth with standard and modified profile are computed. The results show compressive residual stress can improve capacity of gear and operating life. This aspect may contribute to future developments in the understanding of gear durability.

X-Ray Powder Diffraction Characterization of Residual Stresses and Strains in Y3Al5O12:Nd3+ Nanoceramics

2008 ◽  
Vol 571-572 ◽  
pp. 303-308
Author(s):  
Robert Fedyk ◽  
Jorma Hölsä ◽  
Dariusz Hreniak ◽  
Mika Lastusaari ◽  
Vesa Pekka Lehto ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Crystallite Size ◽  
Powder Diffraction ◽  
Average Crystallite Size ◽  
Luminescence Decay ◽  
The Other ◽  
X Ray ◽  
Decay Times ◽  
Residual Stresses And Strains

Y3Al5O12:Nd3+ nanoceramics were obtained by sintering nanocrystalline Y3Al5O12:Nd3+ powders at 450 oC under different pressures between 2 and 8 GPa. The structural purity, residual stress, strain, texture, and crystallite size of the products were analysed with X-ray powder diffraction. The results indicate that the average crystallite size remains unchanged at about 30 nm in spite of the heating and the pressure applied. No texture was observed. On the other hand, the microstrains increase with increasing pressure, while the residual stresses are at their maximum in the green body and the sample processed at 8 GPa. Increasing strains were observed to increase the width of the luminescence lines and to decrease the luminescence decay times.

Analysis of Residual Stresses in Multi-Pass Welding Using Element Generation Technique

2006 ◽  
Vol 326-328 ◽  
pp. 1287-1290
Author(s):  
Jang Hyun Lee ◽  
Kyung Ho Lee ◽  
Chan Woo Lee
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Residual Stresses ◽  
Stress Distributions ◽  
Element Analysis ◽  
Butt Welding ◽  
Distortion Analysis ◽  
Finite Element Procedure ◽  
Residual Stresses And Strains ◽  
Solid Liquid

A finite element procedure to predict residual stresses on the multi-pass arc welding considering the multi-layered beads and solid–liquid phase transformation in the melted bead is implemented and experimentally validated. The nonlinearities of material properties are considered in the thermo-elasto-plastic distortion analysis. Element birth and death technique is used to simulate the weld metal added to base metal in both heat transfer and thermo-elasto-plastic analysis. Residual stresses and strains are computed for butt welding and T-joints fillet welding. The stress distributions calculated by proposed finite element analysis procedure are compared with the measured values of experiments and data available in the other studies. The efficiency of the proposed finite element analysis and experimental procedure is discussed and demonstrated.

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