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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
From The Economist print edition Why the world cannot count on a repeat of the 1980s PARALLELS abound between Ronald Reagan and George Bush. Like the Gipper, Dubya is a sun- belt conservative with fondness for his ranch. In all, Mr Reagan spent about one year of his eight-year presidency at his California retreat. Mr Bush has turned his patch of Texan scrub near Crawford into the hottest destination for world leaders