Mechanical如何实现分步骤/时间步施加约束？比如0~2秒约束状态为两个面固定，2~3秒时为一个面固定。
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Ø 加约束时，使用Displacement的约束方式，而不是Fixed的support方式时，可以实现。
Ø 需要分别设置两个面的位移约束。0-2S， 面A，面B都起作用; 2-3秒，对面B的约束条件的表格，右键执行deactive，此时该载荷步的颜色变灰。
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