research

Dear colleagues,

We invite you to see the preprint of our new paper "Accretion and Ablation in Deformable Solids with an Eulerian Description: Examples using the Method of Characteristics" which will appear in Mathematics and Mechanics of Solids. Recent work has proposed an Eulerian approach to the surface growth problem, enabling the side-stepping of the issue of constructing the reference configuration. However, this raises the complementary challenge of determining the stress response of the solid. To resolve this, the approach introduced the elastic deformation as an additional kinematic descriptor of the added material, and its evolution has been shown to be governed by a transport equation. Here, we applied the method of characteristics to solve concrete simplified problems motivated by surface growth in biomechanics and manufacturing (https://journals.sagepub.com/doi/10.1177/10812865211054573)

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

Title: Fibrous Shell Approach and 3D Second Gradient Modeling for Textile Composite Draping 

Speaker: Dr.  Philippe Boisse

Time: 12/9, 11AM-12PM EST.

Please go to https://bit.ly/3l6LUgT to register for this webinar.

Dear iMechanica Community, I hope that you find the below work of interest to you - We present a generalised phase field formulation for metallic fatigue, where cyclic deformation is modelled by means of a combined non-linear kinematic/isotropic hardening law.

Hi all,

We at iDICs (International Digital Image Correlation Society) are thrilled to invite you to join the most recent DVC (Digital Volume Correlation) challenge! The DVC Challenge 2.0 has two sub-challenges. The first part is an interlaboratory study on the temporal stability of laboratory X-ray Computed Tomography systems. The second part is to identify available experimental and synthetic images and develop a standardized set of high-quality and other challenging datasets from different imaging modalities, which will be further used for DVC code assessment.

50 days' free access to the article. Anyone clicking on this link before December 26, 2021 will be taken directly to the final version of the article on ScienceDirect, which they are welcome to read or download. No signup, registration or fees are required

Hi everyone, I am a postdoc at Yale University. I am posting on some of my previous work on fiber networks and heterogeneous materials. We reported that effective stiffness is a concave function of inhomogeneity properties, and effective stiffness becomes smaller with increasing heterogeneity as an example consequence. 

Our new paper on ultrasonic vibration fatigue [a collaboration between 4 universities & 3 countries] is available for free access until  December 21, 2021, 

Wei Gao

Department of Mechanical Engineering, University of Texas at San Antonio

In this journal club, we provide a brief summary on the concept, recent progress and tools of machine learning (ML) potential for atomistic materials modelling. We hope that it could benefit to the readers who are new to this filed and plan to develop their own or use others ML potentials. Comments and disscussions are welcomed. 

Our recent paper on predicting hydrogen damage in FCC steel single crystals. Most important thing about this paper is that the special issue is dedicated to Professor Siegfried Schmauder on his 65th birthday. Happy birthday Professor Schmauder and thanks for all your guidance, support and collaborations throughout my journey which still continues.

EML Webinar (Season 2) on 4 November 2021 will be given by Hanqing Jiang on origami-based metamaterials: mechanics and devices. Discussion leader: Pradeep Sharma, University of Houston

Time: 10 am Boston, 3 pm London, 10 pm Beijing on 4 November 2021

Predicting high cycle fatigue life with unified mechanics theory - ScienceDirect

Have you ever wondered that you can visually see the stress patterns live in a loaded structure! I am not speaking about the contours that you see in commercial finite element software #fea .

For e.g. see the colorful image attached. The fringe patterns are the live stress field around a crack in a loaded structure.

Find more answers on how to interpret these images using state of the art image processing technology in the newly published book:

Towards the development of reusable space systems, high emissivity coatings on fibrous ceramic substrates with improved thermal resistance are needed. In this study WSi2–MoSi2–Si–SiB6-borosilicate glass coatings were prepared on fibrous ZrO2 by slurry dipping and subsequent high temperature rapid sintering. A coating with 20 wt% WSi2 and 50 wt% MoSi2 presents optimal thermal stability with only 10.06 mg/cm2 mass loss and 4.0% emissivity decrease in the wavelength regime 1.27–1.73 μm after 50 h oxidation at 1773 K. The advantages of double phase metal-silicide coatings combining WSi2 and MoSi2 include improved thermal compatibility with the substrate and an enhanced glass-mediated self-healing ability.

Nearly 50 years ago, Eringen developed a nonlocal theory of elasic solids according to which the Causchy stress tensor "sigma" at a point x depends upon the strain tensor "epsilon" not only at the point x but also at all other points in the body.  For homogeneous solids, and a few additional assumptions, he showed that the constitutive relation can be reduced to a differential form that has become popular among people studying deformations of functionally graded materials (FGMs).  However, an FGM is inhomogeneous

Dear colleagues,

We invite you to see the preprint of our new paper "Statistical mechanics of a dielectric polymer chain in the force ensemble" that will appear in Journal of the Mechanics and Physics of Solids. Here we compute the electroelasticity of single polymer chains using both analytical approximations and novel MCMC techniques. Working in the fixed force ensemble facilitates the derivation of the analytical approximations, which are shown to agree well with the MCMC results. This work complements prior work on the statistical mechanics of dielectric polymers chains obtained in a different ensemble. (https://doi.org/10.1016/j.jmps.2021.104658).

EML Webinar (Season 2) on 13 October 2021 will be given by Alain Goriely on dynamics of active filaments. Discussion leader:Krishna Garikipati, University of Michigan

Time: 10 am Boston, 3 pm London, 10 pm Beijing on 13 October 2021

Mechanobiology and Mechanomedicine: tuning the tension in the life

Baohua Ji (bhji@zju.edu.cn)

Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027

Abstract

FYI, this is a recent review article titled, “Physics of surface vibrational resonances: pillared phononic crystals, metamaterials, and metasurfaces,” which has recently appeared in Reports on Progress in Physics.

Rep. Prog. Phys. 84, 086502, 2021
https://iopscience.iop.org/article/10.1088/1361-6633/abdab8

Dynamic Systems and Intelligent Machines (DSIM) Lab at the San Diego State University has an open PhD position in the areas of perception, planning, and control of autonomous systems. Highly motivated applicants with prior experience in robotics, control, and machine learning and strong programming skills and mathematical background are encouraged to apply. Applicants should have B.Sc. and M.Sc.

Dear iMechanicians. I hope that you find the below work interesting - we have developed the first phase field formulation for hydrogen assisted fatigue. Fatigue crack nucleation and growth is predicted for arbitrary geometries, loading histories, and H contents. Virtual S–N curves are also obtained. You can check it here: https://doi.org/10.1016/j.ijfatigue.2021.106521