1、Plane183 Prony级数
（1）不输入弹性属性EX和PRXY
运算报错，
*** ERROR *** CP = 66.250 TIME= 13:11:30 Element 1 references undefined EX of material 1.
*** ERROR *** CP = 66.312 TIME= 13:11:35 The step data was checked and there were errors found. Please check output or errors file ( G:\\ANSYS work file\\test case\\case_z\\test.err ) for messages.
（2）输入弹性属性EX和PRXY
计算运行正常。
（3）不输入EX
报错：
*** ERROR *** CP = 81.641 TIME= 13:19:28 Element 1 references non-positive EX of material 1.
*** ERROR *** CP = 81.750 TIME= 13:19:31 The step data was checked and there were errors found. Please check output or errors file ( G:\\ANSYS work file\\test case\\case_z\\test.err ) for messages.