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Research on Deformation Control Simulation for Micro-Factory

微工厂变形控制仿真研究

基本信息

批准号：
11450039
负责人：
ISHIKAWA Hiromasa
金额：
$ 7.23万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

To aim at development of a simulator for micro-forming theoretical and experimental studies were conducted in this research. The discussions conducted are as follows:1. Clarification of macroscopic deformation: Since scale of materials used in micro-machines is a few millimeters, such micro structural material subjected to large deformation should be considered three dimensional deformations such as out-of-plane deformation, which can be neglected for large scale materials. Then, the secondary effect due to large deformation process was discussed from experiments used type 304 stainless steels.2. Clarification of micro structural change in internal structures of materials: A micro-constitutive model for plasticity should be constructed considering micro structural change in internal structure of materials. Then, characteristic deformation of materials for micro structure was bserved from both dislocations and geometric change in crystals using the ultrasonic nondestructive material evaluation method.3. Constructing micro constitutive model for plasticity: A plastic constitutive model for forming of macro structural materials is based on the classical plastic model considered the initial anisotropy of materials. However, micro constitutive model for micro forming should be considered the interaction between secondary effect due to the large deformation and the micro structural change in internal structure of materials. Then, a new constitutive model for micro forming process was discussed combining micro and macro deformation process reasonably.4. Constructing simulator for micro forming process: A simulator for micro forming process was discussed considering the micro constitutive model for plasticity constructed in above 3. The problems to incorporate the model into the simulator were clarified to apply the model to more actual cases.

本研究以开发微成形模拟器为目标，进行了理论和实验研究。1.宏观变形的澄清：由于微型机械所用材料的尺度只有几毫米，这种微结构材料受到较大变形时应视为三维变形，如平面外变形，对于大型材料可忽略不计。然后，通过对304不锈钢的实验，讨论了大变形过程的二次效应。阐明材料内部结构的微观结构变化：应考虑材料内部结构的微观结构变化，建立塑性的微观本构模型。然后，利用超声无损材料评价方法，从位错和晶体几何变化两个方面分析了微结构材料的特征变形。建立塑性的细观本构模型：宏观结构材料成形的塑性本构模型是在考虑材料初始各向异性的经典塑性模型的基础上建立的。然而，微成形的微观本构模型应考虑大变形引起的二次效应与材料内部结构的微观结构变化之间的相互作用。在此基础上，将微观变形过程与宏观变形过程合理地结合起来，探讨了一种新的微观成形过程本构模型。微成形过程模拟器的构建：结合前面3中建立的塑性微观本构模型，讨论了微成形过程模拟器的构建。阐明了将该模型集成到模拟器中的问题，以便将该模型应用于更实际的情况。