ansys热力耦合问题？ 100

我是做ansys热力耦合的，我最近碰到一个问题，我才用solid226单元进行直接耦合，可是命令流运行到求解阶段就是求不出来，出现这样的错误， The calculated specific heat at constant strain (Cv) is negative. (See section "Thermoelasticity" of the Theory Reference for the definition of Cv.) Please verify the input of thermal material quantities for consistency. 我实在不知道哪里有问题，万分感谢。