Development of Simulation Method for Predicting Compact Shape in HIP and CIP
HIP 和 CIP 中预测致密形状的模拟方法的开发
基本信息
- 批准号:62850027
- 负责人:
- 金额:$ 4.54万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Developmental Scientific Research
- 财政年份:1987
- 资助国家:日本
- 起止时间:1987 至 1988
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The main objiective of this study is to develop simulating methods to predict the shape of compacts and sensity distribution in the compacts in isostatic pressing of powders. For HIP, a visco-plastic finite element method was developed, whereas for cip a formulation was developed for rigid-plastic finite element analysis; an attempt was also made to analyze by an elastoplastic finite element method.The conventional vonstitutive equation appeared not to apply to alumina powders tested. A new constitutive equation was therefore presented. Further, a non-associated flow rule was also proposed, since the deformation of the ceramic powders is attributed to the relative sliding between particles, which means that internal friction exists.The rigid-plastic finite formulation was developed based on the newly developed constitutive equations, and the results were compared with experimental ones. It appeared that the non-associated flow rule provided better agreement with that of expermental compared with the associated one. Howeber, the non-associated flow rule should be investigated further.An attempt was also made to examine the constitutive equation by the three-dimensional compaction. Also a plane-strain compacting device on which stress ration can be varied during a compacting process was newly designed and built. It was thus found that anisotyopy was apparently induced in the powder during compaction, althoug the constitutive equations, both conventional and newly developed, are isotropic.Generalization of the constitutive equations including anisotropy is a further woek and a systematic study of the mechanics of granular matreials will be pursued.
本研究的主要目的是开发模拟方法来预测粉末等静压过程中压坯的形状和压坯中的密度分布。对于热等静压,建立了粘塑性有限元方法,而对于CIP,建立了刚塑性有限元分析公式,并尝试用弹塑性有限元方法进行分析。传统的本构方程似乎不适用于所测试的氧化铝粉末。由此提出了一种新的本构方程。此外,由于陶瓷粉末的变形归因于颗粒之间的相对滑动,即存在内耗,因此提出了一种非关联流动规律。基于新建立的本构方程,建立了刚塑性有限元方程,并将结果与实验结果进行了比较。与关联流动规律相比,非缔合流动规律与实验结果吻合得更好。然而,非伴生流动规律仍需进一步研究,并尝试用三维压实的方法检验本构方程。此外,还设计并制造了一种可在压实过程中改变应力比的平面应变压实装置。结果表明,尽管传统的本构方程和新发展的本构方程都是各向同性的,但粉末在压制过程中明显地产生了各向异性,包括各向异性的本构方程的推广将是进一步的工作,并将对颗粒材料的力学进行系统的研究。
项目成果
期刊论文数量(23)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
S.Shima;T.Nakanishi: Current Japanese Materials Research,Society of Material Science,Japan. (1989)
S.Shima;T.Nakanishi:当前日本材料研究,材料科学学会,日本。
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A.Nohara;T.Nakagawa;T.Soh;T.Shinke: Int.J.Num.Neth.Engng. 25. 213-225 (1988)
A.野原;T.中川;T.Soh;T.Shinke:Int.J.Num.Neth.Engng。
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Susumu,Shima; Takayuki,Kondo; Mohamed,A.,Saleh: "Compaction Behaviour of Ceramic Powder in CIP" J. Japan Soc. Powder and Powder Metallurgy. 35. 599-602 (1988)
进、志摩;
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島進、中西利介: 塑性と加工. 29. 139-144 (1988)
Susumu Shima,Risuke Nakanishi:可塑性与加工。29. 139-144 (1988)
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島進、近藤隆幸、M.A.E.Saleh: 粉体および粉末冶金. 35. 599-602 (1988)
Susumu Shima、Takayuki Kondo、M.A.E. Saleh:粉末和粉末冶金。35. 599-602 (1988)
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SHIMA Susumu其他文献
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