本文采用了两种销钉，一种是直径为20mm的圆销钉和边长为20mm的方形

This article uses two kinds of pins, one is a round pin with a diameter of 20mm and a square pin with a side length of 20mm. Through the test, it is found that the square pin will wear out during the stress process, but because this test uses a one-way Load, so the amount of wear is not large, see Figure 13.

In this paper, two pins are used, one is a diameter of 20mm round pins and a 20mm edge length of square pins, through the test found that the square pins in the process of force angle wear, but because this test is a one-way load, so the amount of wear is not large, see Figure 13.

In this paper, two kinds of pins are used, one is round pin with diameter of 20 mm and square pin with side length of 20 mm. Through the test, it is found that the edges and corners of square pin will wear during the stress process. However, due to the unidirectional loading used in this test, the wear amount is not large, as shown in FIG. 13.