Showing papers in "Finite Elements in Analysis and Design in 2021"

TL;DR: In this paper, the dissipated strain energy, representing a monotonically increasing state variable in nonlinear fracture mechanics, is used to develop an arc-length constraint equation for tracking the energy dissipation path instead of the elastic unloading path of the response of a structure.

TL;DR: A deep neural network (DNN)-based surrogate model which integrates with differential evolution (DE) algorithm is developed and applied for solving the optimum design problem of geometrically nonlinear space truss under displacement constraints and is referred to as DNN-DE.

TL;DR: In this article, a parallel distributed and open-source framework for full-scale 3D structural topology optimization (TO) is proposed by properly combining parallel computing and mesh adaptation techniques by adopting a reaction-diffusion equation (RDE) based level-set method.

TL;DR: In this article, a finite element framework was developed to predict the part scale residual stress development in the laser powder bed fusion (LPBF) additive manufacturing, and the inherent strain values were estimated according to numerical results from the mesoscale model.

TL;DR: A multisurface return-mapping algorithm and its implementation in the finite element software Abaqus is presented, found that with additional and enhanced iterative solver methods, the classic Newton-Raphson-based implementation of the algorithm can be improved in order to find solutions to otherwise not returnable stress states.

TL;DR: In this article, a crystal plasticity based finite element (CPFE) framework was developed for performing representative volume element (RVE) calculations on two-phase materials, and the authors investigated the mechanical response and the evolution of microstructure of dual-phase (DP) steels under uniaxial tensile loading, with a special focus on void nucleation.

TL;DR: In this paper, a mixed 3−field u/e/p formulation was used to solve non-linear inelastic problems including isochoric deformations, and the convergence rate upon mesh refinement, as well as the enhanced accuracy of the stress and strain fields was proven.

TL;DR: A level set-based topology optimization method is introduced to solve the optimization problem of a two-layered acoustic metasurface that induces negative refraction, and a discussion of its mechanism is provided.

TL;DR: N numerically investigate optimality with respect to the number of degrees of freedom of the numerical solutions obtained by the different refinement strategies proposed.

TL;DR: In this paper, the authors proposed a topology optimization method that accounts for the distortion caused by the residual stress and distortion during additive manufacturing using a time evolutionary reaction-diffusion equation.

TL;DR: In this article, a nonlinear finite element (FE) connector with its identification methodology is proposed to model the behavior of a bolted assembly, based on practical design parameters, such as bolt preload, friction coefficients, or plastic material parameters.

TL;DR: This work presents a comparison of the performance of a priori and a posteriori proper generalised decomposition (PGD) algorithms for an incompressible Stokes flow problem in a geometrically parametrised domain.

TL;DR: The results show that the proposed multiscale framework, denoted by the acronym IGL-GFEMgl, can achieve nearly the same accuracy as a Direct Finite Element Analysis (DFEA) while leveraging methodologies and algorithms implemented in commercial and research software.

TL;DR: In this paper, the constitutive relation is derived for residually stressed solids using an invariant-based free energy approach, and a three-dimensional residual stress field is introduced in the argument of the free energy function.

TL;DR: The present framework enables the comprehensive investigation of the system response due to the occurrence of tangential tractions, which are at the origin of important phenomena such as wear and fretting fatigue, together with the analysis of the effects of coupling between normal and tangential contact tractions.

TL;DR: In this article, a moving-mesh type Finite Element Method (ST/FEM) is proposed for the computation of the transient unconfined seepage flow through the porous medium.

TL;DR: In this paper, a finite element-based simulation method is proposed for fused deposition modeling in two dimensions, which assumes full coupling between the mechanical and thermal response under the assumptions of infinitesimal deformation and finite temperature variation.

TL;DR: A shifting technique is used to enforce compatibility in the direction perpendicular to the crack path, while a blending technique has been adopted to remove the effect of the discontinuity in the extension of the cohesive crack.

TL;DR: In this paper, the authors have modified the stress integration scheme proposed by Choi and Yoon to implement in the finite element code ABAQUS three elastic isotropic, plastic anisotropic constitutive models with yielding described by Yld2004-18p [2], CPB06ex2 [3] and Yld2011-27p [4] criteria, respectively.

TL;DR: In this paper, a unified formulation is proposed in the phase field framework for modeling fracture in polycrystalline materials, which allows modeling competition and interactions between intergranular and transgranular fracture.

TL;DR: In this paper, a finite element model (FEM) is developed to predict the dynamics of polyurea composites by integrating the dynamic properties of the solid steel sections with those of polyuresa using the Golla-Hughes-Mctavish (GHM) mini-oscillator approach.

TL;DR: Kernel Principal Component Analysis (kPCA) is found to be effective to simplify the model outcome description and a benchmark crash test is used to show the efficiency of combining metamodels with kPCA.

TL;DR: In this article, the authors presented a trans-scale finite element model based on hydraulic-thermal-mechanical coupling equations of porous medium to simulate the behavior of concrete during freezing and thawing.

TL;DR: Treating element-based support locations as additional design variables can effectively obtain efficient and innovative structural designs, and is shown to be effective in finite element models.

TL;DR: In this article, a numerical method for analyzing the mechanical deformation and electric polarization of flexoelectric solids is proposed that considers the electric interactions among flexolectric, electric charges, and their surrounding medium.

TL;DR: In this article, a thermodynamics-based material model was used to predict the deformation of single particles at different impact velocities, and the model showed excellent agreement with experimental single particle impact data provided by other universities.

TL;DR: In this article, an enhanced solid finite element formulation for rotor dynamics analysis is presented, where the element kinematics is first defined with a Total Lagrangian formulation in order to account for possible centrifugal stiffening effect and its associated pre-stressed deformation.

TL;DR: In this paper, the authors proposed a new approach to the prediction of multiaxial fatigue with proportional and non-proportional loading based on a recently developed three-dimensional small-strain microplasticity-based constitutive theory.

TL;DR: In this paper, the authors present a principled design evolution that moves from FSI model verification, through a series of bridge simulations (bringing the verification case incrementally closer to the application), in order that they may identify material properties for an underwater, unmanned, autonomous vehicle (UUAV) sail plane.

TL;DR: Comparisons of the performances of second-order finite elements for nodal lumped-mass explicit methods in nonlinear solid dynamics, with a particular emphasis on 10-node “serendipity” and 15- node “Lagrange” tetrahedral elements indicate benefits of including both 10- and15-node tetrahedrons in an explicit code's element library.