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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

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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. https://www.sciencedirect.com/science/article/pii/S0021979718315108#f0040

Hypothesis

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. https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.266101

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ABSTRACT

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.

hyunwoo's picture

Multifunctional “Hydrogel Skins” on Diverse Polymers with Arbitrary Shapes

In this paper, we introduce a new simple yet effective strategy to form "hydrogel skins" on polymer-based medical devices with arbitrary shapes. Hydrogel skins can convert any surface of polymer devices into robust, wet, soft, slippery, antifouling, and ionically conductive without affecting the original properties and geometries.

Abstract

Soft wall-climbing robots

Soft wall-climbing robots

Guoying Gu, Jiang Zou, Ruike Zhao, Xuanhe Zhao and Xiangyang Zhu

Science Robotics, 2018, Vol. 3, Issue 25, eaat2874

keyhani's picture

Energy dissipation in polymer-bonded explosives with various levels of constituent plasticity and internal friction

The ignition of energetic materials (EM) under dynamic loading is mainly controlled by localized temperature spikes known as hotspots. Hotspots occur due to several dissipation mechanisms, including viscoplasticity, viscoelasticity, and internal friction along crack surfaces. To analyze the contributions of these mechanisms, we quantify the ignition probability, energy dissipation, damage evolution, and hotspot characteristics of polymer-bonded explosives (PBXs) with various levels of constituent plasticity of the energetic phase and internal crack face friction.

A novel technology on dynamic interlaminar fracture toughness measurement of composites

Huifang Liu, Hailiang Nie, Chao Zhang, Yulong Li

Composites Sciene and Technology, 2018, https://doi.org/10.1016/j.compscitech.2018.07.040

 

Hailiang Nie, Tao Suo, Xiaopeng Shi, Huifang Liu, Yulong Li, Han Zhao

Antonio Papangelo's picture

Bio-inspired solution for optimal adhesive performance

In recent years there has been a growing interest into high performance bioinspired adhesives. This communication focuses on the adhesive behavior of a rigid cylinder that indents an elastic layer coated on a rigid substrate. With the assumption of short range adhesive interactions (JKR type) the adhesive solution is obtained very easily starting from the adhesiveless one.

Mukunda Madhava Nath's picture

Converting viscoelastic Prony Series terms from ABAQUS to LS-DYNA

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In Abaqus, 

g(t) = 1 - ∑(gi * (1-exp(-t/taui)); 

in which g and gi are dimensionless. 

 

In LS-DYNA, 

G(t) = ∑( Gi * exp(-betai * t) ); 

in which G and Gi are in N/m2

 

Based on this information, how do we transform the Prony Series terms from one code to another or vice-versa given I don't have the test data available.

 

Also, if I have the test data, what is a recommended process to determine Prony Series terms from the same?

hyunwoo's picture

Our new review on "Hydrogel Bioelectronics"

It is my first blog entry to iMechanica after long period of only reading.

In this review published in Chemical Soceity Reviews, we systematically revealed the design principles for bioelectronics and discussed hydrogels' merits and potential in bioelectronics.

 

Abstract

 

Shuze Zhu's picture

Nanomanufacturing of graphene nanosheets through nano-hole opening and closing

Materials Today, in press, 2018, https://doi.org/10.1016/j.mattod.2018.09.001

Yanan Chen, Yilin Wang, Shuze Zhu, Kun Fu, Xiaogang Han, Yanbin Wang, Bin Zhao, Tian Li , Boyang Liu , Yiju Li , Jiaqi Dai , Hua Xie , Teng Li , John W. Connell , Yi Lin, Liangbing Hu

Fan Xu's picture

A modeling and resolution framework for wrinkling in hyperelastic sheets at finite membrane strain

Wrinkles commonly occur in uniaxially stretched rectangular hyperelastic membranes with clamped-clamped boundaries, and can vanish upon excess stretching. Here we develop a modeling and resolution framework to solve this complex instability problem with highly geometric and material nonlinearities. We extend the nonlinear Foppl-von Karman thin plate model to finite membrane strain regime for various compressible and incompressible hyperelastic materials.

Theories used in Abaqus for composite plate modeling

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Which plate theories are used in Abaqus for composite plate modeling? 

I am studying how delaminations in a composite plate affect its damping properties (by contact friction) and thereby to use for Structural health monitoring. Normally, in a metallic plate, no transverse normal stresses (S33) will be generated during pure bending. But, in a laminated composite plate, around discontinuities, S33 have been observed to be generated. But many plate theories neglect S33. But Reddys Layerwise theory and 3D plate theories consider S33 in the analysis. 

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