Global Composites Experts Webinar by Ramesh Talreja
Title: A manufacturing sensitive design strategy for composite materials using physical modeling and stochastic simulation of defects
Speaker: Dr. Ramesh Talreja
research
Analysis of the influence of microstructural traps on hydrogen assisted fatigue
Dear iMechanicians,
I hope some of you find of interest our latest Acta Mat. paper. We show that the concept of "beneficial traps" can enlarge by an order of magnitude the range of "safe loading frequencies" at which hydrogen embrittlement is not observed.
Analysis of the influence of microstructural traps on hydrogen assisted fatigue
Rebeca Fernández-Sousa, Covadonga Betegón, Emilio Martínez-Pañeda
Acta Materialia 199, 253-265 (2020). Link
Hydrolysis-induced large swelling of polyacrylamide hydrogels
By Yu Zhou and Lihua Jin
Kinetic relations and local energy balance for LEFM from a nonlocal peridynamic model
Journal: International Journal of Fracture
Abstract: A simple nonlocal field theory of peridynamic type is applied to model brittle fracture. The kinetic relation for the crack tip velocity given by Linear Elastic Fracture Mechanics (LEFM) is recovered directly from the nonlocal dynamics, this is seen both theoretically and in simulations. An explicit formula for the change of internal energy inside a neighborhood enclosing the crack tip is found for the nonlocal model and applied to LEFM.
Roughness-Induced Adhesion
Usually, roughness destroys adhesion and this is one of the reasons why the "adhesion paradox", i.e. a "sticky Universe", is not real. However, at least with some special type of roughness, there is even the case of adhesion enhancement, as it was shown clearly by Guduru, who considered the contact between a sphere and a wavy axisymmetric single scale roughness, in the limit of short-range adhesion (JKR limit).
EML Webinar by Prof. Robert Ritchie on September 9, 2020: Damage-Tolerance in Engineering and Biological Materials
EML Webinar on 9 September 2020 will be given by Prof. Rob Ritchie, University of California, Berkeley, Discussion leader: Nanshu Lu, University of Texas at Austin.
Title: Damage-Tolerance in Engineering and Biological Materials
Time: 7 am California, 10 am Boston, 3 pm London, 10 pm Beijing on 9 September 2020
Fracture in distortion gradient plasticity
Dear iMechanicians,
I hope that the following paper is of interest to you. We use for the first time Gurtin (2004) gradient plasticity theory to investigate crack tip mechanics, revealing the existence of an elastic core adjacent to the crack tip, resembling a dislocation-free zone. Also, we show that the combination of strain gradient hardening and dislocation blockage can rationalise brittle fracture in elastic-plastic material interfaces.
Journal Club for September 2020: The Biofilm Matrix - A Living Engineering Material
The Biofilm Matrix - A Living Engineering Material
Chenxi Zhai, Haoyuan Shi, Tianjiao Li, Liming Zhao, Jingjie Yeo
J2 Lab for Engineering Living Materials, Sibley School of Mechanical and Aerospace Engineering, Cornell University
Introduction
EML Webinar by Prof. Costantino Crest on 2 September 2020: Using light emission to report damage in soft materials. Can we be quantitative?
EML Webinar on 2 September 2020 will be given by Prof. Costantino Creton, ESPCI Paris. Discussion leader: Tian Tang, University of Alberta.
Title: Using light emission to report damage in soft materials. Can we be quantitative?
Time: 7 am California, 10 am Boston, 3 pm London, 10 pm Beijing on 2 September 2020