Simulation of the Response and Evolution of Localization in Pseudoelastic NiTi Tubes Under Biaxial Stress States

2021 ◽  
pp. 103179
Author(s):  
Karlos Kazinakis ◽  
Stelios Kyriakides ◽  
Chad M. Landis
Keyword(s):  
Biaxial Stress ◽  
Stress States

Developing a Durability by Design Process

2009 ◽  
Author(s):  
John Draper
Keyword(s):  
Finite Element ◽  
Crack Initiation ◽  
Analytical Solutions ◽  
Endurance Limit ◽  
Complex Loading ◽  
Fatigue Analysis ◽  
Biaxial Stress ◽  
Finite Element Models ◽  
Critical Plane ◽  
Stress States

Modern fatigue analysis is providing analytical solutions to problems that could previously be addressed only by methods that were highly empirical and often inaccurate. We can now focus on five crucial steps to successful fatigue analysis. Working from elastic finite element models, the five steps are: 1) the calculation of elastic-plastic stresses and strains for complex loading and biaxial stress states; 2) modification of the endurance limit to allow for the interaction between small and larger cycles; 3) the calculation of the life to crack initiation; 4) critical plane searching to determine the orientation of a potential crack; 5) and an assessment of whether the crack will propagate to failure. The paper describes these steps and the underlying theories, and gives industrial examples of their application to real components.

A Hybrid Experimental-Numerical Test Specimen for Laminated Composite Materials

1991 ◽  
Vol 113 (3) ◽  
pp. 193-196
Author(s):  
W. K. Rule ◽  
G. E. Weeks
Keyword(s):  
Numerical Test ◽  
Cost Savings ◽  
Laminated Composite ◽  
Uniaxial Stress ◽  
Testing Procedure ◽  
Biaxial Stress ◽  
Element Analysis ◽  
Laminated Composite Materials ◽  
Stress States ◽  
A New Technique

A new technique is described for determining all four elastic constants of a lamina from a single laminated specimen of arbitrary, symmetric lay-up. This specimen is subjected to three different loading conditions, and the experimental data is reduced by means of a finite element analysis. The testing procedure for the specimen is relatively easy, which can result in considerable time and cost savings over traditional methods. The new specimen generates biaxial stress states. Thus, the material properties determined from such a configuration may be more appropriate for later use in structural analysis than those determined from traditional specimens with uniform uniaxial stress states.

The Influence of Different Stress States on 16MnR Deformation Capacity

2013 ◽  
Vol 716 ◽  
pp. 590-594
Author(s):  
Shi Lei Zhao ◽  
Yi Liang Zhang ◽  
Gong Feng Jiang
Keyword(s):  
Plastic Deformation ◽  
Stress State ◽  
Equivalent Stress ◽  
Great Influence ◽  
Equivalent Strain ◽  
Complex Stress State ◽  
Biaxial Stress ◽  
Deformation Capacity ◽  
Engineering Structures ◽  
Stress States

16MnR is the typical material of pressure equipment which worked under complex stress state in engineering application. In order to be close to the actual combined tension-shearing stress state and explore the relationship of deformation capacity and different stress state, many groups of combined tension-torsion tests on 16MnR specimens were designed and the equivalent stress-strain relation under different stress state was obtained. The concept of stress triaxiaty (TS value) was cited to characterize the different stress state and the result showed different stress states have a great influence on the material plastic deformation capacity, TS value turns larger, the plastic deformation weakened; 16MnR has a strongest plastic deformation capacity in pure torsion; the level of tensile stress had no significant effect on the maximum stress in the biaxial stress state, but has a significant inverse relationship with the maximum equivalent strain .At last, the mathematical relationship between maximum equivalent-strain and stress triaxiaty could be found. If the stress state of one point in the engineering structures is certain, the maximum equivalent-strain can be estimated.

A Quick Computation of Factor of Safety for Biaxial Stress States

1998 ◽  
Vol 120 (4) ◽  
pp. 721-726
Author(s):  
K. Deb
Keyword(s):  
Factor Of Safety ◽  
Biaxial Stress ◽  
Principal Stresses ◽  
Design Charts ◽  
Failure Theory ◽  
Safe Stress ◽  
Design Activities ◽  
Stress States ◽  
Failure Theories

Determination of overall factor of safety of a design involves repeated calculation of factor of safety at critical points in the design. For a given stress state at a point, the factor of safety is calculated by first finding the principal stresses and then comparing them with the maximum safe stress that can be applied without causing failure of the material according to an appropriate failure theory. In this paper, we suggest quick and ready-to-use expressions and graphs for calculating factor of safety for biaxial stress states for a number of commonly-used failure theories. These graphs can be directly used as design charts for computing factor of safety in engineering design activities.

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