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Shuze Zhu's picture

graphite structural material

Materials Today (2019), in press (https://doi.org/10.1016/j.mattod.2019.03.016).

Yubing Zhou, Chaoji Chen, Shuze Zhu, Chao Sui, Chao Wang, Yudi Kuang, Upamanyu Ray, Dapeng Liu, Alexandra Brozena, Ulrich H.Leiste, Nelson Quispe, Hua Guo, Azhar Vellore, Hugh A. Bruck, Ashlie Martini, Bob Foster, Jun Lou, Teng Li, Liangbing Hu

MNasr's picture

Further study on the existing controversy on the mechanical behaviour of silicon nanowires

A recent study has drawn a new aspect on the role played by the surface stress with a torsional profile on silicon nanowires to address the existing controversy from experimental and computational studies (https://www.researchgate.net/publication/327768951_Surface_Stress_Effect...).

MMSLab-CNR's picture

Paper "The influence of environmental parameters on the dynamic behaviour of the San Frediano bell tower in Lucca"

This paper aims at assessing the influence of environmental parameters on the modal characteristics of age-old masonry constructions. The results of a long-term ambient vibration monitoring of the San Frediano bell tower in Lucca (Italy) are reported. The tower, dating back to the 11th century, has been fitted along its height with four triaxial seismometric stations, which were left active for about one year.

https://doi.org/10.1016/j.engstruct.2017.10.045

Enjoy !

Emilio Martínez Pañeda's picture

Phase field modelling of crack propagation in functionally graded materials

Dear imechanicians

I hope that this paper is of interest to you. The phase field fracture code developed in FEniCS is available at www.empaneda.com/codes

Phase field modelling of crack propagation in functionally graded materials

Hirshikesh, S. Natarajana, R.K. Annabattula, E. Martínez-Pañeda

Composites Part B: Engineering 169, pp 239-248 (2019)

elishako's picture

S.P. Timoshenko and America

I uploaded a new paper titled "SP Timoshenko and America".

Will be appreciative for readers' comments.

Thanks,

Isaac Elishakoff

Nuwan Dewapriya's picture

Performing Uniaxial Tensile Tests of Graphene in LAMMPS

I would like to share the codes required to perform an end-to-end molecular dynamics simulation, which will be useful to the novice researchers in the filed of atomistic simulations. I focus on simulating uniaxial tensile tests of a graphene sample in the LAMMPS molecular dynamics simulator, and I have attached two MATLAB scripts to create the input files for LAMMPS and to extract data from the LAMMPS output file.

Jingjie Yeo's picture

Toward rational algorithmic design of collagen-based biomaterials through multiscale computational modeling

https://doi.org/10.1016/j.coche.2019.02.011 We review the most recent developments in multiscale computational modeling of collagen-based biomaterials to determine their structural, mechanical, and physicochemical properties.

UMAT non-associated Drucker Prager

Hello,

 

I am looking for a UMAT or some sort of reliable piece of code to implement the non-associated Drucker-Prager plasticity. I appreciate your help.

 

Setareh

Torso Model Generation for Simulating Pacemaker Performance

MicroPort develop lifesaving medical products for patients around the world. One of MicroPort’s specialties is in manufacturing cardiac rhythm management devices (CRM) for treating cardiac rhythm disorders and heart failures. The company use Synopsys Simpleware software to model complex pacemaker geometries to better understand patient therapies for conditions such as bradycardia and tachycardia.

Refat_Islam's picture

Parameters controlling the strength of stochastic fibrous materials

Many materials of everyday use are fibrous and their strength is important in most applications. In this work we study the dependence of the strength of random fiber networks on structural parameters such as the network density, cross-link density, fiber tortuosity, and the strength of the inter-fiber cross-links. Athermal networks of cellular and fibrous type are considered. We conclude that the network strength scales linearly with the cross-link number density and with the cross-link strength for a broad range of network parameters, and for both types of networks considered.

Qiming Wang's picture

Journal Club for April 2019: Self-Healing Soft Materials: from Theoretical Modeling to Additive Manufacturing

Journal Club for April 2019: Self-Healing Soft Materials: from Theoretical Modeling to Additive Manufacturing

Qiming Wang

University of Southern California

1. Introduction

Jingjie Yeo's picture

Carbon nanotube arrays as multilayer transverse flow carbon nanotube membrane for efficient desalination

https://doi.org/10.1016/j.memsci.2019.03.062 This work presents the multilayer transverse flow carbon nanotube (CNT) membrane (TFCM), which resembles vertically aligned CNT arrays, as an alternative candidate for efficient desalination. Using molecular dynamics, this work shows that multilayer TFCM can provide permeability and salt rejection on par with its single layer counterpart.

Antonio Papangelo's picture

Adhesion of multilayered materials

Adhesion is a key factor in many tribological processes, especially wear. We generalize a recent formulation for the indentation of a multilayered material using an efficient integral transform method, to the case of adhesion, using a simple energetic transformation in the JKR regime. Then, we specialize the study for the geometry of the Surface Force Apparatus, which consists of two thin layers on a substrate, where the intermediate layer is softer than the other two. We find the pull-off force under "force control" (i.e.

mohsenzaeem's picture

Evolution of solidification defects in deformation of nano-polycrystalline aluminum

Formation of solidification defects and their evolution in uniaxial tensile deformation of solidified polycrystalline aluminum (Al) were investigated by molecular dynamics (MD) simulations. First, solidification process was simulated both isothermally and with different quench rates. At the initial stages of nucleation, coherent twin boundaries and/or fivefold twins formed depending on the quench rate or the undercooling temperature.

Arash_Yavari's picture

Nonlinear and Linear Elastodynamic Transformation Cloaking

In this paper we formulate the problems of nonlinear and linear elastodynamic transformation cloaking in a geometric framework. In particular, it is noted that a cloaking transformation is neither a spatial nor a referential change of frame (coordinates); a cloaking transformation maps the boundary-value problem of an isotropic and homogeneous elastic body (virtual problem) to that of an anisotropic and inhomogeneous elastic body with a hole surrounded by a cloak that is to be designed (physical problem).

rajan_prithivi's picture

Critical porosity in the fatigue of additively manufactured IN718 via crystal plasticity modeling

https://doi.org/10.1016/j.matdes.2018.04.022

Highlights

1. Critical porosity is estimated in additively manufactured IN718 via crystal plasticity.

2. Porosity is characterized using high resolution tomography.

3. Non-local damage indicator parameters identify the location of fatigue crack initiation.

Emilio Martínez Pañeda's picture

Mode I crack tip fields: strain gradient plasticity theory versus J2 flow theory

I hope some of you may find this work interesting. We show, analytically and numerically, that strain gradient plasticity predicts the existence of an inner elastic field adjacent to the crack tip, reminiscent of a dislocation-free zone. The fact that elastic strains dominate plastic strains near the crack tip implies a paradigm-shift with respect to previous crack tip asymptotic studies in plasticity and gradient plasticity, which neglect elastic strains. 

 

Emilio Martínez-Pañeda, Norman A. Fleck

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