From the governing equations of the elastic plane problem and the Airy stress function, the fundamental analytical solutions are first derived and then used as the trial functions to formulate the elements: ATF-Q4a, ATF-Q4b and ATF-Q4q.

• 根据弹性力学平面问题的控制方程和艾雷应力函数,求出问题基本解析解,然后用其作为试函数来构造单元:ATF-Q4a、ATF-Q4b、ATF-Q4q。