[問題] 力學一問,請教板上先進
【出處】(習題或問題的出處)
自訂題目
【題目】(題目的文字敘述,如有圖片亦可提供圖片)
各位力學 MASTER大家好,
小弟手上有一個和人討論到走火入魔,還是沒得到的解答問題需要讓大家幫忙思考
還請先進不吝幫忙
https://www.dropbox.com/s/xg7b7djgzplfrjb/Q1.jpg?dl=0
https://www.dropbox.com/s/zpjnfis1tqghddp/Q2.jpg?dl=0
有四根同樣的方管(或方柱)(強度完全一樣)
固定在牆壁上如圖一,(靠牆的端點與牆壁為強力鎖死或焊死,不考慮會被拔下來)
四個方條管徑不可忽略(管徑 X 或自訂),
四根方條間彼此之間沒有焊接或其他接合,只是擺在一起
前端置一相同重物 (重量 W 或自訂)
請問這兩種放法的撓曲量(下垂量)會不會相等,或是哪一方會下垂比較多
(或換個方式說 F=KX 來說,這四根方管變成的系統,
在這兩種安裝法上,彈性係數K是否相同,或哪個K值會較高,讓而撓曲量較少)
【瓶頸】
探討時兩人在討論中各有意見
一方認為兩邊的撓曲量會相同
這一方認為兩個系統中,四根管彼此若焊死,毫無疑問直列較強,但未焊死就無效
(也就是認為沒焊死跟焊死的狀況不同)
另一方認為因為管徑的存在,在直列安排的時候抗力矩能力較強,撓曲量較少
但是也列不出有說服力的算式,甚至會列錯算式
大家討論到頭昏腦脹了
請板上先進不吝幫忙解惑跟說明,也能救贖此兩人XD,非常感謝 : )
(複雜因素可簡化)
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別再怨了,現在正是好時光
17jump/sleeplist
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※ 文章網址: https://www.ptt.cc/bbs/Mechanical/M.1462639641.A.241.html
※ 編輯: sleeplist (61.228.98.107), 05/08/2016 00:47:58
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05/08 02:31, , 1F
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05/08 02:32, , 2F
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05/08 02:35, , 3F
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05/08 02:44, , 10F
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05/08 02:45, , 11F
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05/08 08:00, , 12F
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05/08 23:50, , 44F
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05/08 23:50, , 45F
05/08 23:50, 45F
※ 編輯: sleeplist (61.228.98.78), 05/08/2016 23:51:28
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05/09 00:14, , 46F
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05/09 00:18, , 53F
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05/09 00:27, , 56F
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05/09 09:04, , 57F
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05/09 09:04, , 58F
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05/09 09:36, , 60F
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05/09 21:24, , 61F
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05/09 21:28, , 62F
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05/09 21:33, , 63F
05/09 21:33, 63F
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