Re: [理工] [材力] 清大98
y※ 引述《gnsh (泳鏡)》之銘言:
: http://ppt.cc/AnOM
: 第四題
: 這題不知道用什麼方法比較好@@
: 我用能量法,但做起來怪怪的
: 想請問大家這題怎麼做呢?
k1 k2
z z
z z
z z
─────────
Mo
左端受力 FL = Mo/L
右端受力 FR = Mo/L
2 2
彈簧應變能 FR / 2k1 + FL / 2k2
M
── 圖
EI
1
──
Mo 2
─── █
4EI ██
███
▁▂▃▄▅▆ █████
─────────── ─────────
█████ █████
███ ███
██ ██
█ █
Mo 1
- ─── - ──
2EI 2
dU MoL Mo L Mo Mo
── = ─── + ─── + ─── + ──── = θc = 0.00078125 rad
dMo 48EI 24EI k1 L^2 k2 L^2
亂做>.< 有錯請指正!
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※ 編輯: ntust661 來自: 218.161.125.126 (02/15 20:56)
※ 編輯: ntust661 來自: 218.161.125.126 (02/15 21:00)
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M
向下 Q 力造成的 ── 圖
EI
L
QL QL ──
── ── 搭配上面那張 4
8EI █ 4EI ██
██ ████
███████ ██████
███████████ ██████████
─────────── ──────────
2 2
dU MoL MoL (Mo/L+Q/2) (Mo/L-Q/2)
── = ── + ── + ───── - ────── = 1.71 mm (向下)
dQ 96EI 48EI 2k1 2k2
Q = 0
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※ 編輯: ntust661 來自: 218.161.125.126 (02/15 21:38)
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※ 編輯: ntust661 來自: 61.231.49.247 (02/16 15:05)
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