Top > Search of Japanese Patents > PHASE TRANSFORMATION BEHAVIOR MEASURING METHOD WITH CONSIDERATION TO ACCOMMODATION BEHAVIOR OF POLYCRYSTALLINE SHAPE MEMORY ALLOY

PHASE TRANSFORMATION BEHAVIOR MEASURING METHOD WITH CONSIDERATION TO ACCOMMODATION BEHAVIOR OF POLYCRYSTALLINE SHAPE MEMORY ALLOY meetings

Patent code P120008303
Posted date Nov 21, 2012
Application number P2010-244919
Publication number P2012-098104A
Patent number P5521162
Date of filing Nov 1, 2010
Date of publication of application May 24, 2012
Date of registration Apr 18, 2014
Inventor
  • (In Japanese)佐久間 俊雄
  • (In Japanese)山本 隆栄
  • (In Japanese)長 弘基
  • (In Japanese)鈴木章彦
Applicant
  • (In Japanese)国立大学法人大分大学
Title PHASE TRANSFORMATION BEHAVIOR MEASURING METHOD WITH CONSIDERATION TO ACCOMMODATION BEHAVIOR OF POLYCRYSTALLINE SHAPE MEMORY ALLOY meetings
Abstract PROBLEM TO BE SOLVED: To provide a measuring method of transformation strain of a shape memory alloy in the case where stress and temperature are specified.
SOLUTION: A measuring method of transformation strain of a shape memory alloy comprises the steps of: describing accommodation behavior by representing a shape memory alloy as a parallel connection of crystals having different crystal orientations from one another and further dividing each crystal grain into partial elements; calculating elastic strain and stress of the each crystal grain from average transformation strain, to which the transformation strain of the each crystal grain becomes equal, of the partial elements; and calculating resolved shear stress of the each crystal grain in each transformation plane and defining that transformation occurs in order of value of the resolved shear stress. An expression of the stress is induced when strain and temperature are given by representing the above described step as an expression 1. An expression 5 for obtaining the strain is induced when the stress and the temperature are given by transforming the expression 1. By using the expression 5, the strain is calculated. However, since the transformation strain contained in the expression 5 is represented as a function of the strain, calculated values of the transformation strain are different from each other before and after calculation thereof if it is left as it is. In order to solve the above described problem the transformation strain is caused to converge by performing repeated calculations thereof.
Outline of related art and contending technology (In Japanese)

形状記憶合金の相変態挙動を精密に予測するためには相変態挙動がアコモデーション機構のもとで生じることを正確に把握する必要がある.形状記憶合金の相変態を伴う応力・ひずみ挙動を予測する技術は下記非特許文献1のようにいくつか提案されているが,そのいずれもが相変態におけるアコモデーション挙動を正確に記述したものでなく,予測技術としては不完全なものである.

Field of industrial application (In Japanese)

本発明は,多結晶形状記憶合金のアコモデーション挙動を考慮した相変態挙動測定方法に関するものである.

Scope of claims (In Japanese)
【請求項1】
 
多結晶形状記憶合金を結晶方位の異なる結晶粒の並列結合により示し,各結晶粒をさらに部分要素に分割し.部分要素の変態ひずみの平均を結晶粒の変態ひずみとし,各々の結晶粒はさらに変態抵抗の異なる部分要素の直列結合で示し、当該部分要素にひずみと温度が与えられた時、その変態面における分解せん断応力を求めこれの限界値と当該部分要素の体積率とにより結晶粒の平均変態ひずみを求め、その都度、前記平均変態ひずみの収束を繰り返し行って応力と温度の負荷履歴に対応するひずみ履歴を計算することを特徴とする多結晶形状記憶合金のアコモデーション挙動を考慮した相変態挙動測定方法
IPC(International Patent Classification)
F-term
State of application right Registered
(In Japanese)ライセンスをご希望の方、特許の内容に興味を持たれた方は、下記「問合せ先」まで直接お問い合わせください。


PAGE TOP

close
close
close
close
close
close
close