Residual stresses in a stress lattice—Experiments and finite element simulations

Gustafsson, Erik; Hofwing, Magnus; Strömberg, Niclas

doi:10.1016/j.jmatprotec.2008.11.025

Cited by 21 publications

(8 citation statements)

References 8 publications

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“…The casting process thus results in non-homogenous mechanical behaviour throughout a component, which needs to be considered to correctly predict the mechanical response and performance of the component [9]. In addition residual stresses induced in the component by the casting process contribute to the behaviour of the component [10].…”

Section: Introductionmentioning

confidence: 99%

Incorporating predicted local mechanical behaviour of cast components into finite element simulations

Olofsson¹,

Svensson²

2012

Materials & Design

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A software which enables the incorporation of local variations in both elastic and plastic mechanical behaviour predicted by a casting process simulation into a Finite Element Method (FEM) simulation is presented. The software uses a piecewise linearization of the Hollomon or the Ludwigson equation to characterise plastic mechanical behaviour of the material on an element level throughout a component. The accuracy obtained in the linearization is investigated, and the performance of the software is studied using different input parameters. The applicability of the software is verified and demonstrated on a ductile iron component, and a simulation strategy for cast components denoted a closed chain of simulations for cast components is discussed.

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Section: Introductionmentioning

confidence: 99%

Incorporating predicted local mechanical behaviour of cast components into finite element simulations

Olofsson¹,

Svensson²

2012

Materials & Design

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“…[2] This study discusses the general features of these equations for duplicating the recovery and strain-rate dependence. Although the classical elasto-plastic model has often been used in thermal stress analysis, especially for shape castings, Gustafsson et al [6] and Motoyama et al [7,8] predicted the residual stress of a stress lattice made of gray cast iron using the classical elasto-plastic model. Dong et al [9] simulated the thermal stress of an aluminum casting with two cast-in stainless liners during casting and treated the aluminum casting as an elasto-plastic in the stress analysis.…”

Section: A Alloy Constitutive Equations Used For Thermal Stress Analmentioning

confidence: 99%

Effects of Recovery Behavior and Strain-Rate Dependence of Stress–Strain Curve on Prediction Accuracy of Thermal Stress Analysis During Casting

Motoyama

Shiga

Sato

et al. 2017

Metall Mater Trans A

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Recovery behavior (recovery) and strain-rate dependence of the stress-strain curve (strain-rate dependence) are incorporated into constitutive equations of alloys to predict residual stress and thermal stress during casting. Nevertheless, few studies have systematically investigated the effects of these metallurgical phenomena on the prediction accuracy of thermal stress in a casting. This study compares the thermal stress analysis results with in situ thermal stress measurement results of an Al-Si-Cu specimen during casting. The results underscore the importance for the alloy constitutive equation of incorporating strain-rate dependence to predict thermal stress that develops at high temperatures where the alloy shows strong strain-rate dependence of the stress-strain curve. However, the prediction accuracy of the thermal stress developed at low temperatures did not improve by considering the strain-rate dependence. Incorporating recovery into the constitutive equation improved the accuracy of the simulated thermal stress at low temperatures. Results of comparison implied that the constitutive equation should include strain-rate dependence to simulate defects that develop from thermal stress at high temperatures, such as hot tearing and hot cracking. Recovery should be incorporated into the alloy constitutive equation to predict the casting residual stress and deformation caused by the thermal stress developed mainly in the low temperature range.

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“…The brake disc is casted in a grey iron alloy. The material model used in the present work was developed in an earlier work [29] in order to simulate residual stresses in castings from solidification and is now utilized for thermomechanical stress analysis.…”

Section: Materials Modelmentioning

confidence: 99%

Finite Element Modeling of Contact Problems

Rashid¹

2016

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Contact is the principal way load is transferred to a body. The study of stresses and deformations arising due to contact interaction of solid bodies is thus of paramount importance in many engineering applications. In this work, problems involving contact interactions are investigated using finite element modeling. In the first part, a new augmented Lagrangian multiplier method is implemented for the finite element solution of contact problems. In this method, a stabilizing term is added to avoid the instability associated with overconstraining the non-penetration condition. Numerical examples are presented to show the influence of stabilization term. Furthermore, dependence of error on different parameters is investigated. In the second part, a disc brake is investigated by modeling the disc in an Eulerian framework which requires significantly lower computational time than the more common Lagrangian framework. Thermal stresses in the brake disc are simulated for a single braking operation as well as for repeated braking. The results predict the presence of residual tensile stresses in the circumferential direction which may cause initiation of radial cracks on the disc surface after a few braking cycles. It is also shown that convex bending of the pad is the major cause of the contact pressure concentration in middle of the pad which results in the appearance of a hot band on the disc surface. A multi-objective optimization study is also performed, where the mass of the back plate, the brake energy and the maximum temperature generated on the disc surface during hard braking are optimized. The results indicate that a brake pad with lowest possible stiffness will result in an optimized solution with regards to all three objectives. Finally, an overview of disc brakes and related phenomena is presented in a literature review. In the third part, a lower limb donned in a prosthetic socket is investigated. The contact problem is solved between the socket and the limb while taking friction into consideration to determine the contact pressure and resultant internal stress-strain in the soft tissues. Internal mechanical conditions and interface stresses for three different socket designs are compared. Skin, fat, fascia, muscles, large blood vessels and bones are represented separately, which is novel in this work

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Residual stresses in a stress lattice—Experiments and finite element simulations

Cited by 21 publications

References 8 publications

Incorporating predicted local mechanical behaviour of cast components into finite element simulations

Incorporating predicted local mechanical behaviour of cast components into finite element simulations

Effects of Recovery Behavior and Strain-Rate Dependence of Stress–Strain Curve on Prediction Accuracy of Thermal Stress Analysis During Casting

Finite Element Modeling of Contact Problems

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