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材料力學圓的慣性矩

Mar 8th 2015, 14:22

1.圓慣性矩I = pi*d^4/64 題解答過程I = pi*r^4/12 ?

Ans: 錯誤!!應該是 I = pi*r^4/4

2.應該用圓周率*半徑四次方/4 嗎?

Ans: Yes!!

3.如果圓洞換在下面有何差別?

Ans:

Ybar = 250 - 111.75 = 138.25 mm

4.材料力學Q是什麼?

Ans:

Q = ∫y*dA = A*ybar

A = 截面積

y = 中心軸到A的重心距離

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