第二步，模拟实验条件，对模型施加边界约束，把实体模型转换为有限元的数学模型，并利用屈曲分析，对瓦楞纸板竖向边压的临界载荷进行计算。

Second, Simulating experiment condition, putting constraint on boundary of model, changing entity model to finite element model and using buckled analysis to calculate the CD critical load.

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利用ANSYS建立了牙轮钻头滑动轴承副实体，与前人所不同的是增加了牙齿实体，并在牙齿顶部加上了面载荷，因此数字模型更能反映实际情况；

The solid of journal bearing pair is created with ANSYS. Some inserts are built and added to the cone solid. The pressure load is applied on the several insert surface, which is more practical.

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