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the errors shown is no power

the errors shown is no power

the errors shown is no power

(OP)
Hello, everyone,

I have made a sandwich composite under three point bending.
The model is a 2D model. The interface between skin and core is adopted by cohesive element, and the skin and core meshed by solid elements. But there is a error which is show that the power is not specified or the specified value is equal to or smaller than zero

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