ANSYS中如何施加预紧力

1、ansys中螺栓的预紧力如何施加我是初学者，螺栓中预紧力的施加不是很清楚，solve之后的预紧力方向为轴向（图见附件）,我觉得不符合实际情况，是不是预紧力施加的方法不对啊，请各位指教给螺栓加预紧力，必须先在螺栓上建立一个预紧力截面，然后在截面上施加预紧力，方向为轴向！在ansys帮助文件里有螺栓加载的例子，找找就能找到！把通过公式F=T/K*d的力值直接加在预紧力截面上。不过存在一个问题，就是利用公示所计算得到的预紧力数值较大，因此所计算出的应力结果也比较大。我查看过一些别的资料,有同行也讨论过这个问题，也认为应力结果与实际不太相符，偏大！所以有人认为K值应该较理论值大一点，取到0.3左右可能

2、更接近实际！采用PSMESH命令定义预紧截面，用SLOAD命令加预紧力可以在ANSYS里面搜一下，有这样的例子.ansys10自带的帮助文件里有一个例子，2.8.DefiningPretensioninaJointFastener大家可以参考一下，大家共同研究研究。/prep7/title,SampleapplicationofPSMESHet,1,92mp,ex,1,1e7mp,alpx,1,1.3e-5mp,prxy,1,0.30mp,ex,2,3e7mp,alpx,2,8.4e-6mp,prxy,2,0.30tref,70/foc,-.09,.34,.42/dist,.99/ang,-5

3、5.8/view,.39,-.87,.31/pnum,volu,1/num,1cylind,0.5,-0.25,0,0,180cylind,0.5,1,1.25,0,180cylind,0.25,0,1,0,180wpoff,.05cylind,0.35,1,0,0.75,0,180wpoff,-.1cylind,0.35,1,0.75,1,0,180wpstyle,0vglue,allnumc,allvplotmat,1smrt,offvmesh,4,5mat,2vmesh,1,3/pnum,mat,1eplotpsmesh,example,volu,1,0,z,0.5,elemsCM,li

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