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.

对模型材料进行了压痕蠕变试验和有限元模拟，结果表明，采用仪器化压痕试验技术可以推导出常规单轴蠕变的本构方程。当压痕压力和压痕蠕变速率分别保持Ps和α不变时，锥形压头下方区域的等效应力和等效塑性应变率等值线随着压头位移的增加而扩大，同时保持几何自相似性。这些结果表明，伪稳态变形发生在压头尖端周围。在有限区域内表现出蠕变行为的代表点实际上决定了压头速度，当蠕变应力指数n= 3.0时，对应点的等效塑性应变速率为α/3.6。由Al-5.3mol%的蠕变试验结果，得到了应力指数和蠕变激活能镁固溶体合金和镁基双相合金的压痕试验结果与文献报道的拉伸蠕变试验结果基本一致。此外，在相同温度下，蠕变试验中的应力值和蠕变速率值与σ_c和σ_c值吻合得很好。上述结果表明，先进材料的蠕变特性，这往往是在微量或小体积试样，可以得到精心设计的压痕蠕变试验，而且，本构方程的拉伸蠕变可以预测足够的精度由压痕蠕变试验结果。

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

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

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