RESEARCH INITIATION: Modeling the Deformation Processing ofSolid Thermoplastics

热塑性塑料大变形加工模型 在固相将开发基于粘塑性有限 元素公式，以利用固有速率- 固体热塑性塑料在成型过程中的相关行为。 一个 隐式时间积分方案将用于解释弹性 形成过程中的影响。 将特别注意形式 材料描述的来源。 模特的动机是 微观结构的考虑将优先考虑一些 这方面的发展努力。 的应用 成型模型将被制成热塑性成型工艺， 该实验数据可在文献中获得。 将考虑到瞬态问题，如表 成形，并且涉及可以被建模为稳态的过程，例如 如挤压和冷拔。 研究的最终成果 应该是一个预测模型与应用程序的设计和 开发热塑性塑料的生产工艺。

A model for the large deformation processing of thermoplastics in the solid phase will be developed based on a viscoplastic finite element formulation in order to take advantage of the inherent rate- dependent behavior of solid thermoplastics during forming. An implicit time integration scheme will be used to account for elastic effects during forming. Special attention will be paid to the form and origin of the material descriptions. Models motivated by microstructural considerations will be given preference with some developmental effort expected in that area. Application of the forming model will be made to thermoplastic forming processes for which experimental data is available in the literature. Consideration will be given to transient problems, such as sheet forming, and to processes which may be modeled as steady-state, such as extrusion and cold-drawing. The ultimate product of the research should be a predictive model with application to the design and development of processes for the manufacturing of thermoplastics.