EML Webinar on 14 October 2020 will be given by Prof. Howard Stone, Princeton University; Manouk Abkarian and Simon Mendez, CNRS, France.
Title: Fluid dynamics of speech: Mechanisms underlying pathogen transmission
This paper describes a data-driven approach to predict mechanical properties of auxetic kirigami metamaterials with randomly oriented cuts. The finite element method (FEM)was used to generate datasets, the convolutional neural network (CNN) was introduced to train these data, and an implicit mapping between the input orientations of cuts and the output Young’s modulus and Poisson’s ratio of the kirigami sheets was established. With this input–output relationship in hand, a quick estimation of auxetic behavior of kirigami metamaterials is straightforward.
Dear Colleagues,
This is the preprint of an article on the design of elastomer networks for optimal electromechanical response that will appear in JMPS. We explore how various structural properties of an elastomer network (e.g. density of cross-links, fraction of loose-end monomers, orientation density of chains, etc.) affects both its bulk elastic and dielectric properties, and its performance as an actuator. (https://doi.org/10.1016/j.jmps.2020.104171).
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EML Webinar on 7 October 2020 will be given by Prof. Kaushik Bhattacharya, Caltech, Discussion leader: Shengqiang Cai, UCSD
Title: Title: Liquid crystal elastomers
Time: 7 am California, 10 am Boston, 3 pm London, 10 pm Beijing on 7 October 2020
Zoom Link: https://harvard.zoom.us/j/271079684
Zoom ID: 271 079 684
Toughening Transparent Ceramics with Bio-inspired Architectures
Zhen Yin (1, 2)
1 McGill University, Canada
2 Max Planck Institute for Intelligent Systems, Germany
Acknowledgement: This journal club was posted on my last day in Montreal. Thanks Prof. Francois Barthelat and all the group memebers for the wonderful six years. A special thanks goes to Prof. Francois Barthelat for his advisory in these years that makes this journal club possible.
A phase-field model based on a modified form of the regularized formulation of Griffith’s fracture theory is presented to investigate intergranular and transgranular crack propagations in polycrystalline brittle materials. Grains and grain boundaries are incorporated in the crack initiation and propagation model based on a phase-field model for grain growth, in which the elastic anisotropy varies based on the grain orientation angle, and the grain boundary energy is related to the misorientation angle of the adjacent grains.
