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学术报告:Multiscale materials modeling and applications in aerospace, biomedical engineering and 3D printing

【题目】Multiscale materials modeling and applications in aerospace, biomedical engineering and 3D printing
【主讲人】李俊博士(美国麻省大学)
【时间】2017年5月26日(星期五)9:30-12:00
【地点】大学城校园工学二号馆603会议室
【备注】报告会安排问答环节,欢迎参会师生准备好相关问题讨论交流

【主讲人简介】
  Dr. Jun Li is an assistant professor in the Department of Mechanical Engineering at the University of Massachusetts Dartmouth since September 2016. He has industrial experience as an R&D quality assurance manager in ABAQUS solver group at Dassault Systemes Simulia Corp before joining UMass. Prior to that, he was a postdoctoral scholar at the Graduate Aerospace Laboratories in the California Institute of Technology. He obtained his Ph.D. in Mechanical Engineering from the University of Illinois at Urbana-Champaign in 2012, where he also earned M.S. degrees in Mathematics and in Theoretical and Applied Mechanics. He completed his B.S. in Power and Energy Engineering with a minor in Mathematics from Shanghai Jiao Tong University in 2015. His research interest is to develop theoretical and computational methods combined with experiments for the assessment, design, optimization, and manufacturing of novel materials and structures in various applications.

【内容简介】
  Multiscale approaches of materials modeling are coming of age and represent a technology shift. The use of computation to understand and design multiscale materials is becoming a trend. However, the predictive power of computational simulations is hindered by enormous information across multiple scales. In this talk, I will discuss examples from aerospace, biomedical engineering and 3D printing with the aim of developing effective multiscale approaches in application. First, I will present a top-down approach to model viscoelastic polymer thin films up to yielding for aerospace balloons. An anisotropic continuum membrane model was developed using a modified free volume theory based on the microscopic molecular mobility. This allows the macroscopic model calibrated to capture both long-duration uniaxial tension and biaxial inflation test results over a wide temperature range for balloon design. Then, I will briefly discuss a bottom-up approach to model elastic modulus of trabecular bone. It employs lamination theories, micromechanics and cellular solid models at hierarchical levels spanning from the collagen-mineral nanoscale to the trabecular macroscale, with experimental inputs from SEM, Micro-CT, and optical microscopy at each level. Finally, I will present a workflow integrating topology optimization, multiscale modeling, and 3D printing for material-by-design.

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