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PhD positions in Controls are available at George Mason University

<p>Applications are invited for PhD positions at the Algorithms in Medicine and Neuro-Technology Lab (AIMAN Lab) in the Department of Mechanical Engineering at George Mason University, Fairfax, VA. "Research" The AIMAN Lab pursues fundamental breakthroughs in biomedical cyber-physical systems.

Postdoctoral position in computational damage geomechanics

A postdoctoral position in the field of Computational damage geomechanics is open at Université Côte d'Azur.

This project is the result of a collaboration between Geoazur at Université de Nice, the Centre for Material Forming (CEMEF) at Mines ParisTech and the Laboratoire Jean-Alexandre Dieudonné (LJAD) at Université de Nice.

Question about implicit creep subroutine in Abaqus

The implicit implementation of creep in abaqus requires dh/d(\delta \epsilon_c ) as Jacobian in Newton-Raphson's iteration. The derivative can be expanded as shown in the figure attached. The term dh/dq, the one underlined by a green stroke, is expected to be provided by users through specifying DECRA, whereas the term dq/d(\delta \epsilon), underlined by a red one, is confusing me. It seems that that term is computed by Abaqus but I have no idea how it is done. The same question applies to the last derivative on the right hand side.

A tutorial on Bayesian inference in mechanics

Hussein Rappel's new paper is out.

— STEPHANE Try out MuLib 

35 PhD positions open - apply online

Cohesive element modelling problem in ABAQUS

Dear All,

I am modelling a 3 point bend specimen with Cohesive elements tied to the upper and lower halves of the specimen in 2d.

The problem is that the CZ elements perform properly only for a combination of element sizes, i.e. a combination of element size of structure and CZ elements, for instance in my case the structure/specimen element size is 0.2mm and CZ is 0.001 or 0.002. For any other combination the adjacent elements bend as shown in the attached image.

I will be glad if someone could explain this behaviour and the solution.

KevinGE's picture

Fast-Response, Stiffness-Tunable Soft Actuator by Hybrid Multimaterial 3D Printing


Fast‐Response, Stiffness‐Tunable Soft Actuator by Hybrid Multimaterial 3D Printing

Yuan-Fang Zhang, Ningbin Zhang, Hardik Hingorani, Ningyuan Ding, Dong Wang, Chao Yuan, Biao Zhang, Guoying Gu,* and Qi Ge*

Emilio Martínez Pañeda's picture

Steady-state fracture toughness of elastic-plastic solids: Isotropic versus kinematic hardening

I hope some of you may find this work interesting. We show that kinematic hardening effects play a significant role in monotonic/static fracture.

Steady-state fracture toughness of elastic-plastic solids: Isotropic versus kinematic hardening

K.J.Juul, E.Martínez-Pañeda, K.L.Nielsen, C.F.Niordson

Engineering Fracture Mechanics, 207, pp. 254-268 (2019)

Volume 207, 15 February 2019, Pages 254-268

peppezurlo's picture

Nonlinear elasticity of incompatible surface growth

In this manuscript with Lev Truskinovsky, we developed a new nonlinear theory of large-strain incompatible surface growth. Surface growth is a crucial component of many natural and artificial processes from cell proliferation to additive manufacturing. In elastic systems, surface growth is usually accompanied by the development of geometrical incompatibility leading to residual stresses and triggering various instabilities. Here we developed a nonlinear theory of incompatible surface growth which quantitatively linkes deposition protocols with post-growth states of stress.

Harold S. Park's picture

Designing Highly Stretchable Kirigami Using Machine Learning

Accelerated Search and Design of Stretchable Graphene Kirigami Using Machine Learning

P.Z. Hanakata, E.D. Cubuk, D.K. Campbell and H.S. Park

Zhaohe Dai's picture

Strain Engineering of 2D Materials: Issues and Opportunities at the Interface

In this progress report, we reviewed recent advances in strategies for applying mechanical strain into 2D materials and recent state‐of‐the‐art characterizations of interface mechanics for 2D material–substrate systems.

Zhengwei Li's picture

A biohybrid valveless pump-bot powered by engineered skeletal muscle

Pumps are critical life-sustaining components for all animals. At the earliest stages of life, the tubular embryonic heart works as a valveless pump capable of generating unidirectional blood flow. Inspired by this elementary pump, we developed the first example of a biohybrid valveless pump-bot powered by engineered skeletal muscle. Our pump-bot consists of a soft hydrogel tube connected at both ends to a stiffer polydimethylsiloxane (PDMS) scaffold, creating an impedance mismatch.

Antonio Papangelo's picture

On unified crack propagation laws

The anomalous propagation of short cracks shows generally exponential fatigue crack growth but the dependence on stress range at high stress levels is not compatible with Paris’ law with exponent m=2. Indeed, some authors have shown that the standard uncracked SN curve is obtained mostly from short crack propagation, assuming that the crack size a increases with the number of cycles N as da/dN=H\Delta\sigma^h where h is close to the exponent of the Basquin’s power law SN curve.

mohsenzaeem's picture

A Review of Computational Modeling Techniques in Study and Design of Shape Memory Ceramics

Shape memory ceramics are a unique family of shape memory materials with a wide variety of applications, such as ultra-high energy dissipation and high-temperature actuation. Along with significant progress in the experimental study of zirconia-based shape memory ceramics in recent years, computational simulations have exhibited powerful capabilities in revealing nano/microstructure-dependent deformation and failure mechanisms in these materials.

Arash_Yavari's picture

Nonlinear Mechanics of Accretion

We formulate a geometric nonlinear theory of the mechanics of accretion. In this theory the reference configuration of an accreting body is represented by a time-dependent Riemannian manifold with a time-independent metric that at each point depends on the state of deformation at that point at its time of attachment to the body, and on the way the new material is added to the body. We study the incompatibilities induced by accretion through the analysis of the material metric and its curvature in relation to the foliated structure of the accreted body.

Regina's picture

PhD and Postdoctoral Research Positions Available Immediately at the University of Haifa, Israel

Project title: Dynamics of methane bubbles ascent in fine-grained aquatic sediments. The project implies conducting modeling and simulations in the field of solid mechanics/linear elastic fracture mechanics.


This study aims at:

Matt Pharr's picture

In-situ measurements of stress evolution in composite sulfur cathodes

Owing to their enormous capacities, Li-S batteries have emerged as a prime candidate for economic and sustainable energy storage. Still, potential mechanics-based issues exist that must be addressed: lithiation of sulfur produces an enormous volume expansion (~80%). In other high capacity electrodes, large expansions generate considerable stresses that can lead to mechanical damage and capacity fading.

noushadbinjamal's picture

ParaDis : Discrete Dislocation Dynamics Simulation

Choose a channel featured in the header of iMechanica: 

Forum to discuss all about use of ParaDis in discrete dislocation dynamics simulation


Tailoring porous media for controllable capillary flow

Liu, M., Suo, S., Wu, J., Gan, Y., Hanaor, D. A. H., & Chen, C. Q. Journal of Colloid and Interface Science, 2019, 539: 379-387.


Zhaohe Dai's picture

Interface-Governed Deformation of Nanobubbles and Nanotents Formed by Two-Dimensional Materials

In this paper, we experimentally characterize a simple and unified power law for the profiles of a variety of nanobubbles and nanotents formed by 2D materials such as graphene and MoS2 layers.

Key image


Optimal-Feedback Accelerated Picard Iteration Method and a Fish-Scale Growing Method for Wide-Ranging and Multi-Revolution Perturbed Lambert's Problems

Wide-ranging and multiple-revolution perturbed Lambert’s problems are building blocks for practical missions such as development of cislunar space, interplanetary navigation, orbital rendezvous, etc. However, it is of a great challenge to solve these problems both accurately and efficiently, considering the long transfer time and the complexity of high-fidelity modeling of space environment. For that, a methodology combining Optimal-Feedback Accelerated Picard Iteration methods and Fish-Scale Growing Method is demonstrated.

A review on modeling of electro-chemo-mechanics in lithium-ion batteries

Investigations on the fast capacity loss of Lithium-ion batteries (LIBs) have highlighted a rich field of mechanical phenomena occurring during charging/discharging cycles, to name only a few, large deformations coupled with nonlinear elasticity, plastification, fracture, anisotropy, structural instability, and phase separation phenomena. In the last decade, numerous experimental and theoretical studies have been conducted to investigate and model these phenomena.

Fan Xu's picture

On the wrinkling and restabilization of highly stretched sheets

Wrinkles are commonly observed in uniaxially stretched rectangular sheets with clamped-clamped boundaries, and can disappear upon excess stretching. Here we explore this wrinkling and restabilization behavior both analytically and numerically. We find that Poisson’s ratio plays a crucial role in the wrinkling and restabilization behavior. Smaller Poisson’s ratio makes later onset of wrinkling, lower amplitude and earlier disappearance of wrinkles.


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