Stereological Analysis of Diformation Mechanism of Granular Materials

颗粒材料变形机制的体视学分析

基本信息

  • 批准号:
    60460156
  • 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 General Scientific Research (B)
  • 财政年份:
    1985
  • 资助国家:
    日本
  • 起止时间:
    1985 至 1987
  • 项目状态:
    已结题

项目摘要

The objective of this research is to investigate the complicated deformation mechanism of granular materials through the studies both on the microscopical behaviors of granular assemblies and on the statistical characteristics as continuum bodies.In this research, a new simulation method for the granular assemblies in two dimensions was developed. The applications to various statical problems show that the mehod presented here is a useful tool for the investigations of mechanical behaviors of granular materials. Especially, it enables us to study in the way of the statistical approach which is represented by the stereological method. The main results obtained through the analyses using this method are the followings: (1) The distribution of dissipation energy calculated at each contact point has the fractal property that the mean value of the energy level is not specified (2) The total dissipation energy changes linearyl with the shear strain except for the sudden changes observed at the steps where the compactions are obsrved with the internal fabric changes. (3) The induced anisotrpy is characterized by a newly defined fabric tensor whose trace represents the co-ordination number and the minor principal value of the tensor changes remarkably with the development of anisotropy.Through the consideration on the macroscopical behaviors of granular materials, several new ideas were presented. A new extremum proinciple for the work done by the deviational stress was proposed. Using this principle topether with approapriate dissipation functions, flow rules for the granular materials can be derived. A reasonable flow rule was derived through the statistical consideration on the dissipation mechanism in grnnular materials. Another new idea is the concept of the work increment tensor. Using this tensor, the Rowe's stress dilatancy equation in two dimensions was extended to the therr dimensional representation which has the suitable form as a tensor equation.
本研究旨在通过对颗粒集合体微观行为和连续体统计特性的研究,探讨颗粒材料复杂的变形机制,提出了一种新的二维颗粒集合体模拟方法。各种静力学问题的应用表明,该方法是研究颗粒材料力学行为的有效工具。特别是,它使我们能够以体视学方法为代表的统计方法进行研究。用该方法分析得到的主要结果是:(1)计算得到的各接触点的耗散能分布具有分形性质,即能级的平均值不确定。(2)总耗散能与剪应变呈线性关系,但在压实度随内部组构变化的台阶处出现突变。(3)引入一个新的组构张量来表征诱导各向异性,其迹代表配位数,且张量的次主值随各向异性的发展而发生显著变化,通过对颗粒材料宏观行为的考虑,提出了一些新的观点。提出了一种新的偏应力做功极值原理。利用这一原理,结合适当的耗散函数,可以导出颗粒物质的流动规则.通过对颗粒材料中耗散机制的统计考虑,导出了合理的流动规则。另一个新的想法是功增量张量的概念。利用这一张量,将二维的Rowe应力双折射方程推广到三维表示,使之具有张量方程的适当形式。

项目成果

期刊论文数量(34)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
佐武正雄: Proc of US-Japan Seminar on Micromechanics of Granular Materials, Elsevier. (1988)
Masao Satake:美日颗粒材料微观力学研讨会论文集,爱思唯尔 (1988)。
  • DOI:
  • 发表时间:
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    0
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  • 通讯作者:
佐藤亮一,佐武正雄,岸野佑次: 昭和61年度土木学会東北支部技術研究発表会講演概要集. 246-247 (1987)
Ryoichi Sato、Masao Satake、Yuji Kishino:1985 年日本土木工程师学会东北分会技术研究演示摘要 246-247 (1987)。
  • DOI:
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    0
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  • 通讯作者:
Yuji Kishino: "On the dirivation of Flow Rules for Granular Materials Based on Dissipation Functions" Proceedings of JSCE. III-9. (1988)
Yuji Kishino:“基于耗散函数的颗粒材料流动规则的推导”JSCE 论文集。
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    0
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岸野佑次: 土木学会第41回年次学術講演会講演概要集. 3. 243-244 (1986)
岸野雄二:日本土木工程学会第 41 届学术年会摘要 3. 243-244 (1986)。
  • DOI:
  • 发表时间:
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  • 影响因子:
    0
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  • 通讯作者:
佐武正雄: Proc of the First International Symposium for Science on Form, KTK Scientific Publishers, Tokyo. 191-200 (1986)
Masao Satake:第一届国际形式科学研讨会论文集,KTK 科学出版社,东京 191-200(1986 年)。
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    0
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SATAKE Masao其他文献

SATAKE Masao的其他文献

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{{ truncateString('SATAKE Masao', 18)}}的其他基金

Development of Method Evaluating Damaged places and Levels in Concrete Structures Through AE Monitoring
通过声发射监测评估混凝土结构受损部位和程度的方法的开发
  • 批准号:
    61850084
  • 财政年份:
    1986
  • 资助金额:
    $ 4.54万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research
Development of Techniques Searching Damaged Locations and Evaluating their Damage Levels in Concrete Structures Through AE Wave Monitoring
通过声发射波监测寻找混凝土结构损坏位置并评估其损坏程度的技术开发
  • 批准号:
    59850076
  • 财政年份:
    1984
  • 资助金额:
    $ 4.54万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research

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