Numerical results indicate that the nonlinear solution is (necessary) to stability analysis because linear buckling loads are much higher than those of nonlinear buckling.
计算得到的线性屈曲稳定系数远远大于非线性稳定系数，表明线性屈曲分析结果不可靠，而宜采用非线性进行计算。
Nonlinear solution, only if element has a nonlinear material.
只有单元定义了非线性材料才能用于非线性求解。
Nonlinear solution, only if element has a nonlinear material.
只有单元定义了非线性材料才能用于非线性求解。
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