2000 Fiscal Year Final Research Report Summary
Transformation-start/finish conditions in an Fe-based shape memory alloy under multiaxial stresses
| Project/Area Number |
11650095
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Tokyo Metropolitan Institute of Technology |
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Principal Investigator |
TANAKA Kikuaki Department of Engineering, Tokyo Metropolitan Institute of Technology, Professor, 工学部, 教授 (80081256)
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| Project Period (FY) |
1999 – 2000
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| Keywords | Fe-based Shape memory alloy / Multiaxial stresses / Transformation-start condition / Transformation-start curve / Reverse transformation-start curve / Reverse transformation-start cone |
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| Research Abstract |
The transformation-start and -finish conditions are identified in an Fe-based shape memory alloy by carrying out the tension/compression-torsion tests of thin-walled tubular specimens.
The martensite-start condition determined in the isothermal proporional loading is represented by the ovalshape curves on the axial stress-shear stress plane, thus being different from the von Mises yield condition in plasticity. The temperature effect is isotropic. The third invariant of the stress should, therefore, be taken into account when constructing a transformation thermomechanical theory.
The austenite-start condition (the reverse transformation-start condition) is represented by a plane in the stress-temperature space. The direction of its unit normal depends on the direction of the pre-stressing, meaning on the type of the martensite variants induced in the pre-stressing process. When several types of variants are induced during pre-stressing, a polygonal cone is formed to represent the austenite-start condition in the stress-temperature space. The position of the plane in the stress-temperature space is governed by the amount of the variants.
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Research Products
(18 results)
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[Publications] Nagayama,K.,Kitajima,Y.,Kigami,S.,Tanaka,K.,Fischer,F.D.and Cailletaud,G.,: "Transformation induced plasticity in maraging steel : An experimental study"Key Engineering Materials. 177/180. 443-448 (2000)
Description
「研究成果報告書概要(和文)」より
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