[理工] [材料力學] 100年成大對答案~
1.
(a).剪應變定義為一個矩形元素變形成為平行四邊形後造成的角度變化量。
(b).線彈性材料滿足應力與應變的線性關係。
(c).聖維南說應力集中只會發生在受力點附近
而距離受力點一段距離後應力會靜力等效並且平均分佈。
(d).施加負載在剪力中心時，只會產生樑的彎曲，反之如果沒有加載於剪力中心上
樑會產生彎曲與與扭轉。
2.
a.錯
b.錯
d.錯
f.錯
3.這題應該要稱為平面應力
σ1 = 180 MPa , σ2 = 80 MPa , σ3 = 0 MPa
ε1 = 0.00032 , ε2 = 0.00022 , ε3 = -0.00026
4.
2
PL δo
ν(x) = ───────── sinπx/L
2
π EI - PL^2
2
π EI
Pcr = ───
L^2
5.
3
P R 4 P 2 2 3
δ = ──── + ───── ( 3R L + 3RL + L )
V E r^4 3πE r^4
δ = 0
H
歡迎大家互相討論^^
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