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Linear perturbation analysis in ABAQUS with surface to surface contact

Submitted by Surendran M on
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#Structural dynamics
# Finite Element modeling; Contact Mechanics; Multiscale Modeling

Hi, I tried a Linear perturbation analysis in ABAQUS with surface-to-surface contact. The parts that are defined as contacting surfaces are 0.2mm apart. They are also given a normal behavior with a pressure overclosure option using "hard" contact. However, in some modes where it is expected to be in contact, there is interpenetration. The problem is that it depends on the scale of deformation too. So my question is how to make this generalised, i.e., include no contact in case of tensile mode behaviour and include high stiffness in case of mode involving compressive type behaviour?

Modeling fatigue life and hydrogen embrittlement of bcc steel with unified mechanics theory

Submitted by Cemal Basaran on
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Fatigue
corrosion
hydrogen embrittlement
unified mechanics theory

50 days' of free access to the article. Anyone clicking on this link before May 12, 2023, will be taken directly to the latest version of the article on ScienceDirect, which you are welcome to read or download. No sign-up, registration, or fees are required.

Article: Viscous Theory for the Vibrations of Coaxial Cylinders: Analytical Formulas for the Fluid Forces and the Modal Added Coefficients

Submitted by lagrangr on
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Fluid-structure Interactions

This article addresses the small-amplitude forced beam vibrations of two coaxial finite-length cylinders separated by a viscous Newtonian fluid. A new theoretical approach based on an Helmholtz expansion of the fluid velocity vector is carried out, leading to a full analytical expression of the fluid forces and subsequently of the modal added mass and damping coefficients. Our theory shows that the fluid forces are linear combinations of the Fourier harmonics of the vibration modes.

Distal and non-symmetrical crack nucleation in delamination of plates via dimensionally-reduced peridynamics

Submitted by Luca-Deseri on
research

R Cavuoto, A Cutolo, K Dayal, L Deseri *, M Fraldi*, Journal of the Mechanics and Physics of Solids 172 (2023) 105189 https://doi.org/10.1016/j.jmps.2022.105189

 

Abstract

Exploiting the framework of peridynamics, a dimensionally-reduced formulation for plates is developed that allows for the through-thickness nucleation and growth of fracture surfaces,

Finite Extension of Accreting Nonlinear Elastic Solid Circular Cylinders

Submitted by arash_yavari on
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Accretion mechanics
Surface growth
Nonlinear elasticity
residual stress
Universal deformations
Geometric mechanics

In this paper we formulate and solve the initial-boundary value problem of accreting circular cylindrical bars under finite extension. We assume that the bar grows by printing stress-free cylindrical layers on its boundary cylinder while it is undergoing a time-dependent finite extension. Accretion induces eigenstrains, and consequently residual stresses. We formulate the anelasticity problem by first constructing the natural Riemannian metric of the growing bar. This metric explicitly depends on the history of deformation during the accretion process.

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