Universal deformations of an elastic solid are deformations that can be achieved for all possible strain-energy density functions and suitable boundary conditions. They play a central role in nonlinear elasticity and their classification has been mostly accomplished for isotropic solids following Ericksen's seminal work. Here, we address the same problem for transversely isotropic, orthotropic, and monoclinic solids.
Have you ever though about what make composite materials fail under cyclic loading? In the paper we collect evidence of what is fatigue damage actually is. We combine the collected clues into a conceptual model for fatigue damage in unidirectional composites. Next, we formulate a mathematical micromechanical model. The model can predict the fatigue life of a unidirectional fibre composites from the basic mechanics properties of the fibre, matrix and the fibre/matrix interface.
Dear colleagues,
The Frontiers in Robotics and AI has launched a new Research Topic, Soft Robotics based on Liquid Crystal Elastomers (LCEs).
The submission deadline is 19 January 2022.
Here is the homepage for this research topic:
https://www.frontiersin.org/research-topics/23109/soft-robotics-based-o…
As a contributing author, you will benefit from:
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EML Webinar (Season 2) on 16 July 2021 will be given by Dae-Hyeong Kim on Unconventional Bioelectronoics for Heart and Brain Diseases. Host: John A. Rogers, Northwestern University
Time: 9:30 am Boston, 2:30 pm London, 9:30 pm Beijing on 14 July 2021
Zoom Link: https://ter.ps/EMLWebinarS2
Live streaming on YouTube: https://ter.ps/EMLYouTubeLV
We report phenomenal yield strengths—up to one-fourth of the theoretical strength of silver—recorded in microcompression testing of initially dislocation-free silver micro- and nanocubes synthesized from a multistep seed-growth process. These high strengths and the massive strain bursts that occur upon yield are results of the initially dislocation-free single-crystal structure of the pristine samples that yield through spontaneous nucleation of dislocations.
We introduce a class of parity-time symmetric elastodynamic metamaterials (Ed-MetaMater) whose Hermitian counterpart exhibits unfolding (fractal) spectral symmetries. Our study reveals a scale-free formation of exceptional points in those Ed-MetaMaters whose density is dictated by the fractal dimension of their Hermitian spectra.
Jessica McWilliams (jmcw [at] seas.upenn.edu), Wei-Hsi Chen (weicc [at] seas.upenn.edu), Cynthia Sung (crsung [at] seas.upenn.edu)
General Robotics, Automation, Sensing & Perception (GRASP) Laboratory, University of Pennsylvania, USA
The non-transforming intermetallic Ni3Ti phase generated in NiTi matrix by additive manufacturing was previously reported to create elastocaloric composites with a great coefficient of performance (COP) between 11 and 22 [Hou et al., Science 366 (6469) (2019) 1116–1121]. In this work, we use a fully thermomechanical coupled phase-field model to design microarchitectures with very high COP considering the effects of all the possible non-transforming intermetallics (Ni4Ti3, Ni3Ti, and Ti2Ni) in NiTi.
Studying fatigue properties of small specimens can be challenging, yet is needed for research purposes as well as for product and verification testing in industries like the medical device and additive manufacturing.
Fatigue testing allows manufacturers and researchers to get a critical understanding of how a material or component will perform in real-world loading scenarios over the course of time. Common fatigue testing definitions and keywords include:
