主题：Orthotropic Tensor Averaging Model for Fiber-filled composite property calculation （纤维加强塑料的各向异性材性的张量平均模型）
报告人：金小石博士， 美国Autodesk 公司
Chopped fiber filled polymer composite material is widely used in the injection molded products. The composite properties which possess anisotropic nature have a direct influence on the produce-induced residual stress and the warpage of the molded part, as well as the structural performance. This paper presents a composite property calculation method based on fiber orientation tensor and fiber breakage models, micro-mechanics models including coefficients of thermal expansion (CTE) models, closure approximation models, and orientation average models. The nine parameters of orthotropic orientation tensor averaging model are derived based on Tandon-Weng’s fully-aligned model and 2D-random model; Two closure approximation models, orthotropic bilinear model and orthotropic biquadratic model, are developed to work with the 9-parameter orthotropic orientation averaging model, and it is found the 9-parameter averaging model is much more accurate than the commonly used 5-parameter Advani-Tucker model based on the original Cintra-Tucker orthotropic fitted models.
Dr. Xiaoshi Stone Jin was one of DUT alumni who graduated in 1982 and obtained MEng degree in 1985 in Department of Engineering Mechanics. After his PhD and a Post-Doc work in University of Glasgow, U.K., Dr. Jin went to Cornell University for his 2nd Post-Doc Fellowship. His solid knowledge and basic training in DUT on structural mechanics and CFD, as well as the long R&D experience in developing and applications of CFD codes for hypersonic turbulence flow and non-Newtonian polymer flow have made him a simulation expert in injection molding and polymer composite material scientist. He was the solver manager in MOLDFLOW Ithaca for 10 years and later became a senior principal research engineer in the commercial software company, C-MOLD -> Moldflow -> Autodesk. One of his key contributions was the development and implementation of CRIMS (Corrected Residual In-Mold Stress) model which laid the foundation of Moldflow for accurate warpage prediction of injection molded part and a high percentage of the market share in the simulation of injection molding.
A father of two boys, Dr. Jin was one of the original founders and is still an active member of Cornell Badminton Club.