in this paper, the effect of autofrettage process parameters on the ultimate pressure that functionally graded spherical vessel can tolerate are investigated. fgm properties and autofrettage pressure are considered as important parameters. assumptions are variation of properties of fgm in radial direction, the residual stress in the absence of bauschinger effect with the operation of variable m...

Cold roller bending is commonly used for bending straight members with hot rolled wide-flange sections to create arches. This process induces plastic deformations along the member, so that it can acquire the desired curvature. The resulting residual stress distribution is different from the wellknown residual stress pattern due to hot rolling. Extensive studies have shown that the influence of ...

Abstract We propose a deep neural network (DNN) as fast surrogate model for local stress calculations in inhomogeneous non-linear materials. show that the DNN predicts stresses with 3.8% mean absolute percentage error (MAPE) case of heterogeneous elastic media and mechanical contrast up to factor 1.5 among neighboring domains, while performing 103 times faster than spectral solvers. The proves ...

Abstract This work presents a multi-scale modelling framework for thermo-mechanical behaviour of Compacted Graphite Iron cast iron. A general thermo-elasto-visco-plastic model is developed to describe the matrix (pearlite) behavior under cyclic loading, which parameters are identified from tests on pearlitic steel. The pearlite takes into account temperature dependent rate-dependency and kinema...

Abstract The expansion induced by cold working is a common process that generates residual stresses. It used when fatigue damage accumulation and life reduction of aluminum alloy perforated plates an issue in the aeronautics industry. This attractive solution to extend lifetime these structures. aims at generating stresses increases thereby strength hollow parts including with holes commonly ma...

We use considerations of energy balance and dissipation to derive a self-consistent version of the shear-transformation-zone (STZ) theory of plastic deformation in amorphous solids. The theory is generalized to include arbitrary spatial orientations of STZs. Continuum equations for elasto-plastic material and their energy balance properties are discussed.