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由于制造上的原因,钢管厚度受到一定限制,在特别高的水头下,必须管外加箍,其方式有两种,一种为箍内径较管外径略小,箍在加热后套至管上,使管壁预受压应力。另一种为箍内径较管外径略大,冷套至管上,再在管内施高压,使管壁发生塑流,在各箍之间形成皱纹。本文对第一种情况进行分析,从管壁与箍变形一致的概念出发提供两个计算应力的方法。其一为利用福里哀级数逼近,适用于箍的刚度较小时;其二视箍为刚性压模,当作弹簧基垫上的长梁处理,适用于箍的刚度较大时。所得到的公式只要系数略加改变,即可用以分析等距矩形分布荷重及等距刚性压模作用下弹簧基垫上的无限长梁。
Due to manufacturing reasons, the thickness of the pipe is subject to certain restrictions, especially in the water head, the pipe must be added plus, there are two ways, one for the hoop diameter slightly smaller than the outer diameter of the tube, the hoop after heating set to the tube , So that pre-stress tube wall. The other is that the inner diameter of the hoop is slightly larger than the outer diameter of the pipe, the pipe is sleeved on the pipe, and then high pressure is applied inside the pipe to generate plastic flow in the pipe wall to form wrinkles between the hoops. In this paper, we analyze the first case and provide two methods to calculate stress from the concept that the wall and hoop deformation are consistent. One is the use of Forressee series approximation, suitable for small hoop stiffness; the second visual hoop for rigid stamper, as a long spring girder pad processing, suitable for large hoop stiffness. As long as the coefficient is slightly changed, the obtained formula can be used to analyze the infinite beam on the spring pad under the load of equidistant rectangle and the equidistant rigid stamper.