#2Mohammad Khalil(SNL: Sandia National Laboratories California)H-Index: 11
Last. Reese E. Jones(SNL: Sandia National Laboratories California)H-Index: 26
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Abstract null null Material produced by current metal additive manufacturing processes is susceptible to variable performance due to imprecise control of internal porosity, surface roughness, and conformity to designed geometry. Using a double U-notched specimen, we investigate the interplay of nominal geometry and porosity in determining ductile failure characteristics during monotonic tensile loading. We simulate the effects of distributed porosity on plasticity and damage using a statistical ...
#1Zhao Zhang(BIT: Beijing Institute of Technology)
#2Yanqing Wu(BIT: Beijing Institute of Technology)H-Index: 9
Last. Fenglei Huang(BIT: Beijing Institute of Technology)H-Index: 25
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Abstract null null An isotropic ductile fracture criterion considering nucleation, growth, shear coalescence and necking coalescence of voids during plastic deformation is developed to model fracture behavior of ductile metals. The innovation of this fracture criterion is that it considers the mechanism of necking coalescence of voids on the basis of a shear-controlled ductile fracture criterion developed by the micro-mechanism ( Lou et al., 2014 ). The damage from coalescence of voids is expres...
#2Pierre-Guy Vincent(CNRS: French National Centre for Scientific Research)H-Index: 7
Last. Mihail Garajeu(AMU: Aix-Marseille University)H-Index: 6
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Abstract null null This study deals with the viscoplastic behavior of a porous polycrystal with pores and grains of similar sizes. Such a microstructure can be encountered in irradiated nuclear Mixed OXide (MOX) fuel materials. MIcronized MASter blend (MIMAS) MOX are multi-phase materials mainly composed of two or three phases depending on their fabrication process. One of these phases corresponds to plutonium-rich agglomerates which strongly evolve during irradiation. The large Pu-rich agglomer...
Last. Elio Sacco(University of Naples Federico II)H-Index: 43
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Abstract null null In the present work, we present a linear poroelastic model for a quasi-static oscillating bilayer beam made by two thick strata in perfect bond at their interface, characterized by different elastic moduli and permeability, both directly influenced by porosity. The solution is built up by considering the structure as a three-dimensional object and is obtained analytically for the full coupling of mass balance and mechanical equations, by imposing weak boundary conditions on th...
Abstract null null The surface effects based on the Gurtin-Murdoch interface model are incorporated into a physics-informed deep neural network (DNN) to enable the discovery of the size-dependent mechanical response in nanoscale structures for the first time. The DNN directly deals with the minimization of a cost function with contributions from total potential energies and penalties representing the displacement boundary conditions. Following this spirit, the Gurtin-Murdoch interface model is d...
Abstract null null A series of ultrasonic vibration tests are performed on A656 grade steel samples, at a frequency of 20 kHz. A fatigue life model based on the unified mechanics theory is introduced to predict the very high cycle fatigue life of metals. Then, the fatigue life test data results are compared with the unified mechanics theory based model simulation results. It is shown that the physics-based unified mechanics theory can predict very high cycle fatigue life very well, without the n...
Abstract null null In this paper, we study the inhomogeneous thinning of a circular dielectric film with a concentric hole subjected to electromechanical loads. The effects of the hole size on the inhomogeneous thinning, the electro-cavitation and pull-in instability of soft dielectric films are seldom investigated. To clarify the highly nonlinear electromechanical behavior, we obtain a two-point boundary-value problem that is first reported in the thinning of dielectric films. The formulation c...
Abstract null null In bladed disks, friction nonlinearities occurring within the contact between the blades and disk or between the blades and underplatform dampers are used to decrease the vibratory energy of the system and extend its lifespan. Modeling these nonlinearities and simulating their effects correctly are challenging: complex nonlinear phenomena such as stick, slip and separation may occur in the contact zones. Efficient numerical methods must be used to compute the dynamics of the s...
Abstract null null The present paper aims to use the concurrent coupling approach of Finite Element Method (FEM) and Discrete Element Method (DEM) to simulate the surface cracking and the local damage in ceramic coating-substrate structures due to mechanical and thermomechanical loading. DEM is an efficient approach for studying the brittle fracture phenomenon at the micro and mesoscale. There are limitations in the use of this method at the macro-scale due to the number of elements. DEM-FEM cou...
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