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A Numerical Study on the Residual Stress Measurement

Residual stress Eigenstrain Accuracy FEM Abstract Investigation of residual stresses is of crucial importance due to their e ect on the performance of engineering components. Recently, inverse methods have been developed for determination of the residual stresses. Inverse eigenstrain method is one of the mentioned inverse methods. The inverse Critical assessment of the determination of residual Aug 01, 2014 · Residual stresses and their distribution within individual layers are a general concern in thin film technology. Here we use a recently developed ion beam layer removal method to determine the stress profile in a thin film system. The system consists of a thin tungsten and titanium nitride film deposited on a silicon substrate.

Determination of Singular Residual Stresses in Epoxy Layer

The viscoelastic boundary element method is employed to investigate the behavior of interface stresses. The order of the singularity is obtained numerically for a given viscoelastic model. The numerical results exhibit the relaxation of interface stresses and large stress gradients are observed in the vicinity of the free surface. Determination of principal residual stresses directions for the residual state of stress determination, this article describes procedure how unknown directions and mag-nitudes of principal residual stresses can be determined. Finite element method (FEM) is used for the numerical simulation of homogenous residual state of stress and for subsequent strain determination. Relieved strains on the Determination of transient and residual thermal-hardening Diagrams for determining weight fractions of pearlite and martensite, transient and residual thermal-hardening stresses are numerically evaluated and analysed for steel plates. Kinetics of phase transformation and the accompanying volumetric dilatation are taken into account. The diagrams enable the evaluation of proportions of individual constituents and phases, determination of relative

Fracture Parameters in a Welding Residual Stress Field - TWI

Apart from the determination of residual stresses by various experimental techniques such as centre-hole drilling, sectioning and neutron diffraction, a large amount of work has been undertaken for over many years in FEA of welding residual stresses [ eg [1-2] ]. Numerical and experimental description of the welding Mar 21, 2016 · Welding residual stresses were determined on the top surface of the case-1 specimens by means of the x-ray diffraction technique. For case-2, both surface and in-depth residual stress fields were determined in order to study the whole residual stress field in the material by means of x-ray and neutron diffraction, respectively. On the Determination of Residual Stress and Mechanical rials properties and residual stress over a wide range, such that our numerical analysis would cover most engineering materials used in practice. Thus, in this study, the nite element method (FEM) is used to investigate the effect of residual stress on elasticplastic indentation of

RESIDUAL STRESSES IN SURFACE-HARDENED OIL FIELD

containing residual stresses, the residual stresses are changed from what existed in the original specimen. Consequently, corrections must be made to the stresses obtained from gages mounted in a bore if the stresses in the original specimen are to be known. To illus- trate the corrections and to furnish an example FIGURE 3. Residual stresses and viscoelastic deformation of an part. Residual stresses are measured by the hole drilling method because the automotive part selected in this study has a complex shape. Residual stress distribution predicted by the thermal stress analysis is compared with the measurement results obtained by the hole drilling method. The molded specimen has residual stressDetermination of Residual Stresses Numerically Obtained in Residual stresses have been numerically determined in welded joints. In this study, the numerical model is based on the coupling of different physical phenomena considering the thermal, mechanical and metallurgical nature of a welding process. The ABAQUS software program was used to perform the numerical simulations, based on the finite element method (FEM).