Stress Compensation Method for Shakedown Analysis and Its Engineering Applications

2020 ◽  
pp. 137-166
Author(s):  
Heng Peng ◽  
Yinghua Liu ◽  
Haofeng Chen
Keyword(s):  
Compensation Method ◽  
Engineering Applications ◽  
Shakedown Analysis ◽  
Stress Compensation

Stress Compensation Method for Structural Shakedown Analysis

2019 ◽  
Vol 794 ◽  
pp. 169-181
Author(s):  
Heng Peng ◽  
Ying Hua Liu
Keyword(s):  
Large Scale ◽  
Direct Method ◽  
Numerical Procedure ◽  
Compensation Method ◽  
Control Technique ◽  
Collapse Mechanism ◽  
Residual Stress Field ◽  
Engineering Structures ◽  
Shakedown Analysis ◽  
Stress Compensation

This paper presents a novel direct method called the stress compensation method (SCM) for structural shakedown analysis. Being different from the popular direct method of mathematical programming, the SCM just carries out some iterative calculations. Making full use of static shakedown theorem, the residual stress field is constructed via solving the modified global equilibrium equations. An effective and robust iteration control technique is adopted to generate a sequence of decreasing load multipliers. The numerical procedure is incorporated into the ABAQUS platform via some user subroutines. The shakedown problems for a cantilever beam, a symmetric continuous beam and a practical shell with nozzles are effectively solved and analyzed. These results are compared to the analytical solutions and those found in literatures. Both the incremental collapse mechanism and the alternating plasticity mechanism are revealed to determine the shakedown boundaries. Numerical examples show that the SCM is of numerical stability, good accuracy, high computational efficiency, and can effectively perform shakedown analysis of large-scale practical engineering structures.

Stress Compensation Techniques in Thin Layers Applied to Silicon Micromachining

1992 ◽  
Vol 284 ◽  
Author(s):  
W. Lang ◽  
G. Mük ◽  
E. Rose ◽  
J. Bausells ◽  
K. Kühl ◽  
...  
Keyword(s):  
Thin Films ◽  
Ion Implantation ◽  
Stress Reduction ◽  
Thickness Ratio ◽  
Compensation Method ◽  
Thin Layers ◽  
Film Stress ◽  
Silicon Micromachining ◽  
Stress Compensation ◽  
Free Films

ABSTRACTStress in thin films is one of the mayor technological problems of silicon micromachining. Therefore stress reduction by a compensation method increases the technological use of a material. Three methods to obtain stress free films are investigated:1. Stress in SiO2 and Si3N4 can be compensated by ion implantation.2. Sandwich layers of SiO2 and Si3N4 can be made internally stress compensated by variation of the thickness ratio.3. Polysilicon is stress reduced by appropriate doping and annealing.The film stress is evaluated by the measurement of the bending of the substrate. Examples of processed membranes, bridges and cantilevers made of stress compensated films are given.

Research on Electrified Railway Evaluation and Compensation Method

2013 ◽  
Vol 760-762 ◽  
pp. 1376-1380
Author(s):  
Yuan Yuan Zhang ◽  
Yong Hai Xu
Keyword(s):  
Power System ◽  
Quality Assessment ◽  
Power Quality ◽  
Quality Indicators ◽  
Reference Value ◽  
Compensation Method ◽  
Engineering Applications ◽  
Harmonic Content ◽  
Non Linear ◽  
Electrified Railway

As a particular user of the power system, electric railway has the characteristics of non-linear, asymmetric and volatility. The power quality indicators of electrified railway were analyzed and summarized in this paper. The harmonic content rate reference value of various types of locomotives was given as well as the calculate method using in the power quality assessment, which are suitable for engineering applications. At last, this paper gives several effective measures on improving the power quality.

The elastic compensation method for limit and shakedown analysis: A review

2000 ◽  
Vol 35 (3) ◽  
pp. 171-188 ◽  
Author(s):  
D Mackenzie ◽  
J T Boyle ◽  
R Hamilton
Keyword(s):  
Elastic Modulus ◽  
Compensation Method ◽  
Complex Structures ◽  
Element Level ◽  
Shakedown Analysis ◽  
Comprehensive Review ◽  
Reduced Modulus ◽  
Modulus Method ◽  
Future Work ◽  
Elastic Compensation Method

A comprehensive review of the elastic compensation method for calculating limit and shakedown load bounds for complex structures is presented. The origins of the method in pressure vessel design by analysis is described and related methods for load and shakedown analysis considered, in particular Marriott's reduced modulus method, Seshadri's GLOSS r-node method and Ponter's modified elastic modulus method. The paper concludes with a recommendation for future work: development of an element level formulation of the method.

One-Equation Turbulence Modelling for Atmospheric and Engineering Applications

2004 ◽  
Vol 113 (3) ◽  
pp. 321-346
Author(s):  
A. Venetsanos ◽  
J. Bartzis ◽  
S. Andronopoulos
Keyword(s):  
Turbulence Modelling ◽  
Engineering Applications
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