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xiangzhang's picture

Rapid synchronized fabrication of vascularized thermosets and composites

Dear colleagues,

We are happy to share a recent collaborative study on experimental and numerical investigation of  rapid synchronized fabrication of vascularized thermosets and composites. This study demonstrated that a thermoset polymer or polymer composites with embedded microvascular systems can be fabricated in a single step, using a self-propagating polymerization reaction front.  For more details, please see: https://www.nature.com/articles/s41467-021-23054-7

mohsenzaeem's picture

Nanotwin-induced strengthening in silicon: A molecular dynamics study

Mechanical performance of silicon nanopillars with homogeneous and gradient nanotwinned structures are investigated through a series of molecular dynamics simulations. The most observed Σ3 twin boundary (TB) with two preferable (lowest surface energy) planes of {111} and {001} are used to generate homogeneous and gradient nanotwinned structures. Simulations of compression and tension of nanotwinned pillars reveal an extra strengthening behavior due to the addition of Σ3 TBs when compared to the single crystalline nanopillar without any TBs.

Teng Li's picture

Keep EML Webinar going!

Keep EML Webinar going by donating at: 

https://www.gofundme.com/f/keep-eml-webinar-going

We gratefully acknowledge the financial support for Season 2 of EML Webinar by (as of 18 May 2021):

Denian Zhuang, Jimmy Hsia, Zhigang Suo, Ruobing Bai, Teng Li, Liqing Jiao, Shengqiang Cai, Grace Gu, Xin Wen, Jianyu Li, Jin Yang, Nitesh Arora, and anonymous donors. 

Teng Li's picture

EML Webinar (Season 2) by Eduard Arzt, on 19 May 2021: Designing with gaps – functional surfaces for sustainable gripping

EML Webinar (Season 2) on 19 May 2021 will be given by Eduard Arzt, Saarland University. Designing with gaps – functional surfaces for sustainable gripping. Discussion Leaders: Huajian Gao, Nanyang Technological University

Time: 10 am Boston, 3 pm London, 10 pm Beijing on 19 May 2021

What makes plant cell walls both strong and extensible?-----a collaborative study led by Prof. Sulin Zhang and Prof. Daniel Cosgrove in Science

The plant cell wall possesses an unusual combination of strength and ability to expand without weakening or breaking (a quality required for plant growth), but the molecular basis for these traits has long been unclear. In a collaborative study led by Prof. Sulin Zhang and Prof.

Hangbo Zhao's picture

PNAS: Compliant 3D frameworks instrumented with strain sensors for characterization of millimeter-scale engineered muscle tissues

In this work published in PNAS (https://www.pnas.org/content/118/19/e2100077118), we present compliant 3D frameworks that incorporate microscale strain sensors for high-sensitivity measurements of contractile forces of engineered optogenetic muscle tissue rings, supported by quantitative simulations.

Abstract: 

Phase field modelling in octave

Choose a channel featured in the header of iMechanica: 

Hi I tried to code a basic phase field model for fracture in octave.

It doesn't seem to converge to the correct load. It fails later.

Also mesh refinement did not improve the results.

The link to the GIT is here

https://github.com/dontcallmesuren/Phase-field-modelling.git

 

Any idea where I am wrong?

Ping me. Thanks in advance.

Pradeep Sharma's picture

Mechanics to explain tsunamis---Rosakis and co-workers in PNAS

Ares Rosakis and collaborators across three other institute have just published a fascinating account of a rather unexpected mechanism for generating  tsunamis. The paper, published in PNAS, is attached with this post.

The associated press-release provides a compelling lay-person summary: https://www.caltech.edu/about/news/contrary-to-previous-belief-strike-sl...

 

Wenbin Yu's picture

Global Composites Experts Webinar by Dr. Pascal Hubert

cdmHUB invites you to attend the Global Composites Experts Webinar Series. 

Title: Sustainable Manufacturing of Composite Materials

Speaker: Dr.  Pascal Hubert

Time: 5/13, 11AM-12PM EST.

Please go to https://www.purdue.edu/cmsc/events/2020-webinars/ to register for this webinar.

Young’s Modulus, Tangent Modulus, and Chord Modulus

This blog post covers the description and determination of Young’s modulus, tangent modulus, and chord modulus. These properties, commonly used for product and material specification, can be calculated by subjecting a specimen to uniaxial force, measuring its stress and strain properties, and generating a stress-strain curve. The accuracy of the modulus determination depends on the precision of the load and strain measurements.

Arash_Yavari's picture

On Nye's Lattice Curvature Tensor

We revisit Nye's lattice curvature tensor in the light of Cartan's moving frames. Nye's definition of lattice curvature is based on the assumption that the dislocated body is stress-free, and therefore, it makes sense only for zero-stress (impotent) dislocation distributions. Motivated by the works of Bilby and others, Nye's construction is extended to arbitrary dislocation distributions. We provide a material definition of the lattice curvature in the form of a triplet of vectors, that are obtained from the material covariant derivative of the lattice frame along its integral curves.

Arash_Yavari's picture

Elastodynamic Transformation Cloaking for Non-Centrosymmetric Gradient Solids

In this paper we investigate the possibility of elastodynamic transformation cloaking in bodies made of non-centrosymmetric gradient solids. The goal of transformation cloaking is to hide a hole from elastic disturbances in the sense that the mechanical response of a homogeneous and isotropic body with a hole covered by a cloak would be identical to that of the corresponding homogeneous and isotropic body outside the cloak.

ebarbero's picture

Using Abaqus CZM, How can I get crack length for each increment?

When using CZM for crack propagation, for each CZM element, once the separation delta > delta_c, the adhesive is completely damaged, cannot transmit stress. delta_c is the separation on the right side of the bilinear or trapezoidal models. How can I get the length of the crack for each increment of applied displacement or load? I can see that the totally damage element disappear from the Visualization but I need a better way that gives me crack length, not just a picture that shows the crack longer for each increment.

N. Sukumar's picture

Exact imposition of boundary conditions in physics-informed neural networks

We recently proposed a method that uses distance fields to exactly impose boundary conditions in physics-informed neural networks (PINN).  This contribution is available as an arXiv preprint.

mohsenzaeem's picture

Quantitative prediction of rapid solidification by integrated atomistic and phase-field modeling

Dear iMechanica colleagues, I am pleased to share with you our newest paper on qauntitative prediction of rapid solidification. S. Kavousi, B. Novak, D. Moldovan, and M. Asle Zaeem. Quantitative prediction of rapid solidification by integrated atomistic and phase-field modeling.

Juner Zhu's picture

Postdoctoral Associate Position in the area of machine learning for solid-state batteries

Our team led by Professor Tomasz Wierzbicki at MIT Mechanical Engineering is looking for a highly motivated Postdoctoral Associate in the area of machine learning for solid-state batteries. The candidate is expected to develop machine-learning-based computational tools for the characterization of the interfacial failure in Li-metal all-solid-state batteries. Candidates who have experience in physics-informed machine learning, computational and solid mechanics, multiphysics modeling, and all-solid-state batteries are encouraged to apply by sending a CV to Dr.

Wenbin Yu's picture

Webinar: Efficient High-Fidelity Design and Optimization of Composite Blades/Wings Using VABS

On April 27th we will present a webinar hosted by our partner @Altair where we will share efficient high-fidelity design and optimization of composite blades using VABS. Register now at https://bit.ly/3gnQJAN

Jinxiong Zhou's picture

Implementation of Abaqus user subroutines and plugin for thermal analysis of powder-bed electron-beam-melting additive manufacturing process

Electron beam melting (EBM) is a metal powder bed fusion additive manufacturing (AM) technology that is widely used for making three-dimensional (3D) objects by adding materials layer by layer. EBM is a very complex thermal process which involves several physical phenomena such as moving heat source, material state change, and material deposition. Conventionally, these phenomena are implemented using in-house codes or embedding some user subroutines in commonly used commercial software packages, like Abaqus, which generally requires considerable expertise.

Wenbin Yu's picture

Global Composites Experts Webinar by Dr. R. Byron Pipes

cdmHUB invites you to attend the Global Composites Experts Webinar Series. 

Title: Rheology of Carbon Fiber Thermoplastic Polymer Composites

Speaker: Dr.  R. Byron Pipes

Time: 4/22, 11AM-12PM EST.

Please go to https://www.purdue.edu/cmsc/events/2020-webinars/ to register for this webinar.

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