Prediction of the constitutive equation for uniaxial creep of power-law materials through instrumented indentation testing and modeling

通过仪器化压痕测试和建模预测幂律材料单轴蠕变本构方程

• 批准号: 22560660
• 负责人: FUJIWARA Masami
• 金额: $ 2.83万
• 依托单位: Nihon University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22560660/
• 关键词: 力学特性; 計装化押込み試験; クリープ変形; クリープ構成式の予測; クリープ特性値; 高温変形律速機構; 金属物性; 力学物性; 物性実験; 高温変形; 構成式; クリープ; インデンテーション; 有限要素法; 押込み試験; クリープ試験; 高温変形機構; 自己相似形圧子; コントロールボリューム

Indentation creep tests and finite element simulations were performed on a model material to show that a constitutive equation for conventional uniaxial creep can be derived using the instrumented indentation testing technique. Whenthe indentation pressure and the indentation creep rate maintain constant values of Ps and α, respectively, the contours of the equivalent stress and the equivalent plastic strainrate in the region beneath the conical indenter expand according to the increase in the indenter displacement while maintaining the geometrical self-similarity. These findings indicate that a pseudo-steady state deformation takes place around the indenter tip. The representative points exhibiting the creep behavior within the limited region, which actually determines the indenter velocity,is defined as the location where the equivalentstress 〓 is equal to Ps/3.The equivalent plastic strain rate at the correspondingpoint is found to α/3.6 in the case that the creep stress exponent is n=3.0.The stressexponent and the activation energy for creep extracted from the results of Al-5.3mol%Mgsolid-solution alloy and Mg-based dual phase alloy indentation tests are in close agreementwith those of tensile creep tests reported in the literature. In addition, the values for〓and〓 agree well with the values for the applied stress and the corresponding creep ratein tensile creep tests at the same temperature. The above results show not only that thecreep characteristics of advanced materials, which are often available in minute quantities or as small-volume specimens, can be obtained from carefully designed indentation creep tests, but also that the constitutive equation for tensile creep can be predicted with sufficient precision through indentation creep test results.

在模型材料上进行了压痕蠕变测试和有限元模拟，以表明可以使用仪表式压痕测试技术得出常规单轴蠕变的本构对等。当压力压力和压痕蠕变速率分别保持PS和α的恒定值时，根据凹痕缩进器位移的增加，在锥形凹痕下方的区域中，等效应力的轮廓和等效的塑性劳累量在维持几​​何学自相关性的同时扩大。这些发现表明，伪造状态变形发生在凹痕尖端周围。在有限区域内表现出蠕变行为的代表性点（实际上决定了压痕速度），被定义为等效性等效性〓等于ps/3的位置。相应点处的等效塑性应变速率在α/3.6的情况下，在蠕变应力指数为n = 3.0的情况下。和基于MG的双相合金凹痕测试与文献中报道的拉伸蠕变测试的合金凹痕测试非常吻合。此外，在相同温度下的施加应力值和相应的蠕变拉伸测试的值和相应的蠕变速率蠕变测试。以上结果不仅表明，通常以分钟数量或小体积标本可用的高级材料的蠕变特性可以从精心设计的凹痕蠕变测试中获得，而且还可以通过凹痕蠕变测试结果进行足够的精度来预测拉伸蠕变的本构方程。

项目成果

計装化押込み試験法によるLPSO型マグネシウム合金の高温クリープ特性評価

仪器化压痕测试法评价LPSO型镁合金高温蠕变性能

• 发表时间: 2011
• 作者: S. Inagaki;T. Tokuzawa;K. Itoh;K. Ida;S.-I. Itoh;N. Tamura;S. Sakakibara;N. Kasuya;A. Fujisawa;S. Kubo;T. Shimozuma;T. Ido;S. Nishimura;H. Arakawa;T. Kobayashi;K. Tanaka;Y. Nagayama;K.Kawahata;S. Sudo;H. Yamada;and A. Komori;竹田大介
• 通讯作者: 竹田大介

Creep characterization of power-law materialsthrough pseudo-steady indentation tests and numerical simulations

通过伪稳态压痕测试和数值模拟对幂律材料进行蠕变表征

• 发表时间: 2010
• 期刊: Journal of Physics
• 作者: H. Takagi;M. Dao and M. Fujiwara
• 通讯作者: M. Dao and M. Fujiwara

Creep Characterization of Power-Law Materials through Pseudo-Steady Indentation Tests and Numerical Simulations

通过伪稳态压痕测试和数值模拟对幂律材料进行蠕变表征

• 发表时间: 2010
• 期刊: Journal of Physics : Conference Series
• 作者: H.Takagi;M.Dao;M.Fujiwara
• 通讯作者: M.Fujiwara

押込み試験による超微細結晶粒Al-Mg固溶体合金のクリープ挙動

超细晶Al-Mg固溶体合金的蠕变行为的压痕试验

• 发表时间: 2012
• 作者: 若生啓;小島謙一;渡邉貴久,竹田大介,藤原雅美,高木秀有,東田賢二,河村能人;小野寺秀博;塚島史朗,藤居大毅,若生啓,小島謙一,橘勝;山梨直紀,高木秀有,藤原雅美;若生啓,藤居大毅,塚島史朗,橘勝,小島謙一;小野寺秀博;H.Takagi and M.Fujiwara;山梨直紀,高木秀有,藤原雅美
• 通讯作者: 山梨直紀,高木秀有,藤原雅美

マグネシウム基延性二相合金押出材の等ひずみ速度変形モデル

镁基韧性两相合金挤压材料等应变率变形模型

• 发表时间: 2012
• 作者: 渡邊貴久;竹田大介;高木秀有;藤原雅美
• 通讯作者: 藤原雅美