EML Webinar (Young Researchers Forum) on 18 April 2024 will be given by Tongqing Lu at Xi'an Jiaotong University
Title: High throughput rupture experiments of soft materials
Discussion leader: Zhigang Suo, Harvard University
Time: 10:00 am Boston, 3:00 pm London, 4:00 pm Paris, 10:00 pm Beijing on Thursday, 18 April 2024
In classical experiments, it has been found that a rigid cylinder can roll both on and under an inclined rubber plane with a friction force that depends on a power law of velocity, independent of the sign of the normal force. Further, contact area increases significantly with velocity with a related power law. We try to model qualitatively these experiments with a numerical boundary element solution with a standard linear solid and we find for sufficiently large Maugis–Tabor parameter � qualitative agreement with experiments.
In this pair of preprints (see also attached PDFs):
Quenched disorder and instability control dynamic fracture in three dimensions
The composite tape-spring hinge (CTSH) is a lightweight structural connector widely employed in space structures, including spacecraft and satellites, due to its high specific strength and stiffness. Introducing cutouts enables CTSH to possess folding and deployment capability, while optimizing the cutouts finely to optimize the performance of CTSH. However, the interaction between cutout size and the dynamic deployment of CTSH is a novel topic.
The ABD matrix is a fundamental method to characterize the overall stiffness behavior of laminated composite structures. Although classical laminate theory has been widely used, it has limitations in predicting the ABD matrix for woven composites. To address this issue, this paper presents a mesoscale homogenization approach aimed at computing the ABD matrix for thin woven composites accurately. The mesoscale representative volume element (RVE) of the woven composite is generated using TexGen and imposed with periodic boundary conditions to enforce the Kirchhoff thin plate assumption.
To address the significant challenges in predicting high-dimensional chaotic systems, this paper introduces a novel hybrid strategy that combines proper orthogonal decomposition (POD), which serves as reduced order modeling (ROM), with next generation reservoir computing (NGRC), a data-driven prediction model. The POD-NGRC strategy harnesses the strengths of POD in extracting principal evolutionary features and reducing system complexity, along with the high accuracy, ease of design, enhanced robustness, and high computational efficiency offered by NGRC.
The International Journal of Solids and Structures is pleased to institute an annual Best Paper Award for Young Investigators. The award will be given annually to a paper published in the previous year whose principal or corresponding author is under the age of 38 or within 10 years of the completion of their PhD.
Please pardon me if I am preaching to the choir here. Rules of mixtures (ROM) are very simple mechanics models. Everybody on this site has a very good understanding of it. However, confusion and mistakes on ROM constantly appear in textbooks, journal articles, online learning materials, etc. See attached two wiki articles. The major confusing point is that vf*Ef+vm*Em is derived from the isostrain assumption and the upper bound. Both statements are incorrect. There might be two main reasons contributed to this mistake/confusion.
I am modelling a 3D solid model of simply supported sandwich plate with foam core, the core is modelled as Johnson-Cook material model with damage definitions, so the element deletion can be acheived. I tried using tie constraints between the core and face sheets, but due to the deletion of elements in the core at the interface, the face sheet is penetrating into the core beyond the supports. I tried using nodal surfaces and surface interactions, which avoids this issue but after defining the cohesive propeties for the interaction, the analysis is shutting abruply.
