Problem Set 1 Prof. Gene Chang Due on Dec.5 5th in the class,orta' 's office(经院220室) Late turn-in may result in a penalty in the grade 1. The consumption set is={x X E}. Suppose the utility function representing the preference
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例题2-5求例题2-4中所示薄壁圆环在内压力 b p=2MPa作用下的径向应变和圆环直径的改变量。 已知材料的弹性模量E=210GPa p 解:在例题2-4中已经求出圆环在任一横截面 上的正应力=40MPa,若正应力不超过材料的比 例极限,则可按公式(2-6)算出沿正应力方向 (a) (即沿圆周方向)的线应变为