Since we chose M16 bolts, the area of the dangerous section corresponding to the small diameter of the thread is about 140mm². According to the formula (3-8), C=43MPa, in addition to the tensile stress, the bolt is also subjected <br>to friction between the thread pairs during the tension process. The effect of the resistance moment produces shear stress. For bolts of M10~M64, TL=0.5Oi, and then according to the fourth strength theory
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