一、基本计算机1.计算齿根应力σ_F 大家知道,齿根危险截面的位置可以用多种方法确定,其中有代表性的是抛物线法(图1a)及30°切线法(图1b)。由于30°切线法与试验结果相比有足够的精确度,而且危险截面的位置不因载荷作用点不同而变化,使用起来方便,因此航标是采用30°切线法来确定危险截面的位置。 First, the basic computer 1. Calculate the root stress σ_F As we all know, the location of the root of the dangerous cross section can be determined by a variety of methods, of which the typical parabolic method (Figure 1a) and 30 ° tangent method (Figure 1b). 30 ° tangent method compared with the test results have enough accuracy, and the location of the dangerous cross-section does not vary due to the role of the load point of change, easy to use, so the buoy is the 30 ° tangent method to determine the location of the dangerous cross-section.