好似呢一題咁，唔係應該用(stress z)^2+(stress y)^2搵返bending stress出黎咩?
[N展/物理]點解stress from bending moment 唔同方向可以直接相加?
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https://www.scribd.com/doc/297072883/Mechanics-of-Materials-Solutions-Chapter08-Probs65-81
好似呢一題咁，唔係應該用(stress z)^2+(stress y)^2搵返bending stress出黎咩?
好似呢一題咁，唔係應該用(stress z)^2+(stress y)^2搵返bending stress出黎咩?
因為你個i拎嘅係along section width and depth
咁你拆force要along翻個axis
否則你個i同y要計翻個rotation
然後strain同stress關係係linear
你apply 1kn嘅力會除翻個coefficient出翻個strain
所以兩個bending moment induce出黎嘅stress互加就得
留意翻compression and tension嘅正負號
咁你拆force要along翻個axis
否則你個i同y要計翻個rotation
然後strain同stress關係係linear
你apply 1kn嘅力會除翻個coefficient出翻個strain
所以兩個bending moment induce出黎嘅stress互加就得
留意翻compression and tension嘅正負號