instabilities

In this work, we show that the combination of material quenched disorder (of finite strength/amplitude and correlation length) and a 2D tip-splitting instability (that gives rise to extra fracture surfaces) is at the heart of the spatiotemporal dynamics of cracks in 3D. Specifically, it is shown to account for the widely observed limiting (terminal) velocity of cracks, mirror-mist-hackle sequence of morphological transitions, crack macro-branching and a 3D-to-2D transition, out-of-plane crack front waves and the properties of micro-branches.  

Following the previous Blog entry on 3D fracture and out-of-plane crack structures: the essential role of material disorder, we add here a related manuscript (see also attached PDF):

Size selection of crack front defects: Multiple fracture-plane interactions and intrinsic lengthscales

In this pair of preprints (see also attached PDFs):

Quenched disorder and instability control dynamic fracture in three dimensions

Facet formation in slow three-dimensional fracture

Dear Colleagues,

Our paper on elastic instabilities in soft fiber composites recently got published in International Journal of Engineering Science. In this paper, we explore how the stiffening behavior of composites phases influences the development of instabilities and associated buckling patterns. To do that, we use non-Gaussian hyperleastic  model to define the constitutive behavior of phases. 

MS-7-4

http://www.esmc2018.org/drupal8/node/93

Mini-Symposium 7-4 - Instabilities in Structural Mechanics and Fluid-Structure Interactions at ESMC 2018 in Bologna. Deadline for abstract submission: November 15, 2017. Organizers: Oleg Kirillov (Northumbria University), Olivier Doare (ENSTA Paristech). Mini-symposium description:

A. Goshkoderia and S. Rudykh, Composites Part B, 128:19-29 (2017) https://doi.org/10.1016/j.compositesb.2017.06.014

Department of Engineering (ENG), Aarhus University (AU) invites applications for a number of positions as tenure track assistant professors or associate professors in the field of Mechanical Engineering (ME). The University has ambitious plans to increase its activities significantly within research and education as well as public and industrial collaboration with the vision of bringing AU into the global engineering elite.

V. Slesarenko and S. Rudykh, Harnessing viscoelasticity and instabilities for tuning wavy patterns in soft layered composites. Soft Matter (2016)  DOI: 10.1039/C5SM02949J

Dear Colleagues,

I want to share with you our work on geometric instabilities in thin films, which was recently accepted in Soft Matter.

Understanding the dynamic stability of bodies in frictional contact steadily sliding one over the other is of basic interest in various disciplines such as physics, solid mechanics, materials science and geophysics. Here we report on a two-dimensional linear stability analysis of a deformable solid of a finite height H, steadily sliding on top of a rigid solid within a generic rate-and-state friction type constitutive framework, fully accounting for elastodynamic effects.

Stability of anisotropic magnetorheological elastomers in finite deformations: A micromechanical approach

Stephan Rudykh and Katia Bertoldi

Journal of the Mechanics and Physics of Solids 61 (2013) 949–967

Abstract:

http://www.springerlink.com/content/wx185g5301300521/fulltext.pdf