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一般化されたフックの法則
1. 多軸応力状態の応力ーひずみ関係を導出できる
目標
2. 一般化されたフックの法則を説明できる
3. 体積ひずみを説明できる
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多軸応力状態の応力ーひずみ関係
σy
σy
σyによるひずみ
εy=
E
1 σy εx εz= =
E
ν
σy−
σxによるひずみ
εx=
E
1 σx εy εz= =
E
ν
σx−
σz によるひずみ
εz =
E
1 σz εx εy= =
E
ν
σz−
( )εx=
E
1 σx ν σy− σz+
ν= − (横ひずみ/縦ひずみ)
ν= εy− εx / = εy− /εz
単軸応力状態
多軸=単軸の重ね合わせ
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一般化されたフックの法則
τxy=
G
1
γxy
τzx=
G
1
γzx
τyz=
G
1
γyz
( )εx=
E
1 σx ν σy− σz+
( )εy=
E
1 σy ν σz− σx+
( )εz =
E
1 σz ν σx− σy+
3/6
ひずみから応力
σx= ( )( )1 ν 1 2ν−+
E ( )1 ν− εx ( )ν +εy εz+
σy= ( )( )1 ν 1 2ν−+
E ( )1 ν− εy ( )ν +εz εx+
σz= ( )( )1 ν 1 2ν−+
E ( )1 ν− εz ( )ν +εx εy+
τxy γxy=G τzx γzx=G τyz γyz=G
4/6
体積ひずみ
V=dx dzdy V’= dx( )εx1+ dy( )1+εy dz( )1+εz
V
V’ − V
= εx εy εz+ + +εx εy + εy εz + εz εx + εx εy εz
~− εx εy εz+ +
εV =
=
E
1 2ν−
( )σx+σy+σz
dx dx( )εx1+
dy( )1+εy
dy
dz( )1+εzdz
5/6
まとめ:一般化されたフックの法則
2. 一般化されたフックの法則 3. 体積ひずみ
1. 多軸応力状態の応力ーひずみ関係
多軸=単軸の重ね合わせ
① 単軸応力状態のひずみを考える
② 単軸応力状態のひずみを成分ごとに加える
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Hinweis der Redaktion

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