This work addresses the determination of yield surfaces for geometrically exact elastoplastic rods. Use is made of a formulation where the rod is subjected to an uniform strain field along its arc length, thereby reducing the elastoplastic problem of the full rod to just its cross-section. By integrating the plastic work and the stresses over the rod's cross-section, one then obtains discrete points of the yield surface in terms of stress resultants. Eventually, Lamé curves in their most general form are fitted to the discrete points by an appropriate optimisation method.

We are looking for strongly motivated Postdocs and/or Ph.D. students to join our group in the Department of Mechanical Engineering & Materials Science at Duke University. Two openings with primary focuses on flexible electronics and programmable matter are available immediately. 

Position 1: The research will aim to create new classes of epidermal electronics for precision measurement of body mechanics and acoustics. The candidate is expected to collaborate with the school of medicine at Duke University to explore novel clinical applications.

One position for a PhD Student in Experimental Biomechanics for 3-4 years; expected from April 1, 2021 at the Institute of Biomechanics in Graz, Austria.

Acceptance conditions:
M.S. in Biomedical Engineering, Experimental Physics, Mechanical or Civil Engineering or related fields and experience, with the desire to pursue a PhD degree.

Dear iMechanicians, I hope that our latest JMPS paper is of interest to you. We show how the phase field paradigm can be extended to model localised corrosion (aqueous electrolyte-solid interface) and the associated damage mechanisms. 

C. Cui, R. Ma, E. Martínez-Pañeda. A phase field formulation for dissolution-driven stress corrosion cracking. Journal of the Mechanics and Physics of Solids 147, 104254 (2021)

https://www.sciencedirect.com/science/article/pii/S0022509620304622

A central tool of nonlinear anelasticity is the multiplicative decomposition of the deformation tensor that assumes that the deformation gradient can be decomposed as a product of an elastic and an anelastic tensor. It is usually justified by the existence of an intermediate configuration. Yet, this configuration cannot exist in Euclidean space, in general, and the mathematical basis for this assumption is on unsatisfactory ground.

3D Printing of Batteries: Fabrication, Materials and Challenges 

Yaokun Pang, Changyong Cao*

Laboratory for Soft Machines & Electronics, Michigan State University

1. Introduction

The Department of Mechanical Engineering at the University of California, Merced (UC Merced) is looking for highly competitive and enthusiastic applicants for our Master’s and Ph.D. programs, with a starting date of Fall 2021. The department is active in both classical end emerging areas of research in mechanical engineering. For more details about research activities, faculty profiles and graduate education, please visit: me.ucmerced.edu. 

The paper "Estimating static/dynamic strength of notched unreinforced concrete under mixed-mode I/II loading" by N. Alanazi and L. Susmel in Engineering Fracture Mechanics 240 (2020) 107329, pp. 1-18, is a readworthy and very interesting paper. Extensive fracture mechanical testing of concrete is throughly described in the paper. The tests are performed for different fracture mode mixities applied to test specimens with different notch root radii at various elevated loading rates. 

I would like to share another article from my group just published in CMAME. I think this is an interesting approach towards the automatic generation of constitutive laws for arbitrary microstructures:

https://authors.elsevier.com/a/1bxlSAQEIt1ls

The article focuses on how to systematically create constitutive laws using only:

1) Available microstructural models

2) Machine learning techniques