Method of analyzing limiting complex-stress states of isotropic and anisotropic materials

1986 ◽  
Vol 18 (7) ◽  
pp. 897-902
Author(s):  
V. P. Bagmutov
Keyword(s):  
Anisotropic Materials ◽  
Complex Stress ◽  
Stress States

scholarly journals Investigation of deformation twinning under complex stress states in a rolled magnesium alloy

2016 ◽  
Vol 683 ◽  
pp. 619-633 ◽  
Author(s):  
Wei Wu ◽  
Chih-Pin Chuang ◽  
Dongxiao Qiao ◽  
Yang Ren ◽  
Ke An
Keyword(s):  
Magnesium Alloy ◽  
Complex Stress ◽  
Deformation Twinning ◽  
Stress States

A cohesive model for fatigue failure in complex stress-states

2012 ◽  
Vol 36 (1) ◽  
pp. 155-162 ◽  
Author(s):  
Deepak Jha ◽  
Anuradha Banerjee
Keyword(s):  
Fatigue Failure ◽  
Complex Stress ◽  
Cohesive Model ◽  
Stress States

Analysis of Residual Stresses and Distortions in Brazed Joints of Cemented Carbide and Steel

2005 ◽  
Vol 490-491 ◽  
pp. 491-496 ◽  
Author(s):  
A. Ottlik ◽  
Volker Schulze ◽  
L. Pintschovius ◽  
Hermann Müller ◽  
Detlef Löhe
Keyword(s):  
Residual Stresses ◽  
Fatigue Behaviour ◽  
Complex Stress ◽  
Cemented Carbide ◽  
Experimental Characterization ◽  
Fem Simulations ◽  
X Ray ◽  
Brazed Joints ◽  
Stress States

Brazing of cemented carbides to steel bodies gives rise to the development of complex stress states and distortions which influence the fatigue behaviour of the parts. It is quite important to estimate the residual stresses with numerical methods whose agreement is to be guaranteed with experimental characterization of the brazed parts. In this work FEM simulations and X-ray as well as neutron stress analysis were used to examine the residual stresses of brazed samples. Joints with different geometries and dimensions made of cemented carbide and different steels showing different phase transformation behaviours were investigated.

scholarly journals Neutron Diffraction and Diffraction Contrast Imaging for Mapping the TRIP Effect under Load Path Change

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1450 ◽  
Author(s):  
Efthymios Polatidis ◽  
Manuel Morgano ◽  
Florencia Malamud ◽  
Michael Bacak ◽  
Tobias Panzner ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Central Area ◽  
Complex Stress ◽  
Trip Effect ◽  
Load Path ◽  
Contrast Imaging ◽  
Stress Concentrations ◽  
Diffraction Contrast ◽  
Stress States ◽  
In Situ Neutron Diffraction

The transformation induced plasticity (TRIP) effect is investigated during a load path change using a cruciform sample. The transformation properties are followed by in-situ neutron diffraction derived from the central area of the cruciform sample. Additionally, the spatial distribution of the TRIP effect triggered by stress concentrations is visualized using neutron Bragg edge imaging including, e.g., weak positions of the cruciform geometry. The results demonstrate that neutron diffraction contrast imaging offers the possibility to capture the TRIP effect in objects with complex geometries under complex stress states.

Time Response Stress Analysis of Solid and Reinforced Thin-Walled Structures by Component-Wise Models

2020 ◽  
pp. 2043010
Author(s):  
R. Azzara ◽  
E. Carrera ◽  
M. Filippi ◽  
A. Pagani
Keyword(s):  
Stress State ◽  
Complex Stress ◽  
Time Response ◽  
Modeling Technique ◽  
Integration Scheme ◽  
Structural Domain ◽  
Mode Superposition ◽  
Thin Walled Structures ◽  
Thin Walled ◽  
Stress States

This paper deals with the evaluation of time response analyses of typical aerospace metallic structures. Attention is focussed on detailed stress state distributions over time by using the Carrera Unified Formulation (CUF) for modeling thin-walled reinforced shell structures. In detail, the already established component-wise (CW) approach is extended to dynamic time response by mode superposition and Newmark direct integration scheme. CW is a CUF-based modeling technique which allows to model multi-component structures by using the same refined finite element for each structural component, e.g. stringers, panels, ribs. Component coupling is realized by imposing displacement continuity without the need of mathematical artifices in the CW approach, so the stress state is consistent in the entire structural domain. The numerical results discussed include thin-walled open and closed section beams, wing boxes and a benchmark wing subjected to gust loading. They show that the proposed modeling technique is effective. In particular, as CW provides reach modal bases, mode superposition can be significantly efficient, even in the case of complex stress states.

A long-term strength criterion for frozen clay under complex stress states

2020 ◽  
Vol 176 ◽  
pp. 103089
Author(s):  
Dun Chen ◽  
Wei Ma ◽  
Guoyu Li ◽  
Zhiwei Zhou ◽  
Yanhu Mu
Keyword(s):  
Strength Criterion ◽  
Complex Stress ◽  
Term Strength ◽  
Frozen Clay ◽  
Stress States

Three-Dimensional Plate Theory for Flexible Multibody Dynamics

2015 ◽  
Author(s):  
Shilei Han ◽  
Olivier A. Bauchau
Keyword(s):  
Plate Theory ◽  
Three Dimensional ◽  
Laminated Composite ◽  
Flexible Multibody Dynamics ◽  
Composite Plates ◽  
Complex Stress ◽  
Mindlin Plate ◽  
Stress States ◽  
Three Dimensional Elasticity ◽  
Material Line

In structural analysis, many components are approximated as plates. More often that not, classical plate theories, such as Kirchhoff or Reissner-Mindlin plate theories, form the basis of the analytical developments. The advantage of these approaches is that they leads to simple kinematic descriptions of the problem: the plate’s normal material line is assumed to remain straight and its displacement field is fully defined by three displacement and two rotation components. While such approach is capable of capturing the kinetic energy of the system accurately, it cannot represent the strain energy adequately. For instance, it is well known from three-dimensional elasticity theory that the normal material line will warp under load for laminated composite plates, leading to three-dimensional deformations that generate complex stress states. To overcome this problem, several high-order, refined plate theories have been proposed. While these approaches work well for some cases, they often lead to inefficient formulations because they introduce numerous additional variables. This paper presents a different approach to the problem: based on a finite element semi-discretization of the normal material line, plate equations are derived from three-dimensional elasticity using a rigorous dimensional reduction procedure.

Effect of State of Stress on the Cavitation Behavior of Al 5083 Superplastic Material

2005 ◽  
Vol 475-479 ◽  
pp. 2931-2936 ◽  
Author(s):  
Names Chandra ◽  
Marwan K. Khraisheh ◽  
Peter N. Kalu
Keyword(s):  
Rolling Direction ◽  
Superplastic Forming ◽  
Complex Stress ◽  
The State ◽  
Sheet Rolling ◽  
State Of Stress ◽  
Mapping Process ◽  
Stress States ◽  
Cavitation Behavior ◽  
The Right

In this paper we address the controversial issue of nucleation of cavities in Al 5083 alloys and their subsequent growth to coalescence and failure. We focus on the origin and growth of cavities not only during the primary processing of Al 5083 in sheet forms, but also during the manufacture of these sheets into SPF (superplastic forming) components. Experimental observations of pre-existing cavities in this alloy are made using optical and electron microscopy. The role of sheet rolling direction, and the state of stress during superplastic deformation on the cavity formation and coalescence are also discussed. The effect of the state of stress (uniaxial, plane strain, balanced biaxial, and tri-axial) on the growth characteristics of cavitation is also examined. It is found that the uniaxial model based cavitation cannot directly be extended to predict the behavior of more complex stress states, unless great care is taken to identify the right strain measure for the mapping process.

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