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各位高手，我在做一个模型的拓扑优化，约束应力最大不超过材料的疲劳极限，优化过程中出现如下错误，忘哪位大神给帮忙解答！！
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*** ERROR # 1800 ***
Stress/strain/force response is applied to topology or
free-size domain. For stress-constrained topology or
free-size optimization, please use the STRESS option
on the design variable definition card.
Property ID = 1
Stress/strain/force response is applied to topology or
free-size domain. For stress-constrained topology or
free-size optimization, please use the STRESS option
on the design variable definition card.
Property ID = 1
821549081 
