• 2022-07-26
    23.冲床如图所示,若要在厚度为t的钢板上冲出直径为d的圆孔,则冲头的冲压力P必须不小于______________。已知钢板的剪切强度极限和屈服极限。/ananas/latex/p/153801/ananas/latex/p/43402https://p.ananas.chaoxing.com/star3/origin/3d71da08980c7d9e8c49430faafa12fa.png