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在双轴向疲劳试验中,试件有失稳的可能.本文采用能量准则分析了十字形板试件的屈曲现象,并根据表征临界状态时系统总势能的二阶变分为零的条件,推得结构的特征值.在有限元分析中采用了ASKA程序,应用完全协调的TRIB3三角形板弯元对试件进行了总体稳定性的计算,得到了双轴向疲劳试件的临界载荷.计算结果和实验情况基本相符,表明采用有限元法进行稳定性分析其结果是可靠的.
In the biaxial fatigue test, the specimen may have the possibility of instability. In this paper, the buckling phenomenon of the cruciform plate specimen is analyzed using the energy criterion, and according to the condition that the second-order variation of the total potential energy of the system is zero when the critical state is represented, The eigenvalues of the structure are obtained. The ASKA program is used in the finite element analysis. The overall stability of the specimen is calculated using the fully-coordinated TRIB3 triangular plate bending element, and the critical load of the biaxial fatigue specimen is obtained. The results are basically consistent with the experimental conditions, indicating that the results of the stability analysis using the finite element method are reliable.