• 2022-11-02
    如图所示应力状态,斜边为自由表面(应力为零),则该点的三个主应力为:[img=398x319]18034a2493726a6.png[/img]
    A: 0,0,-80MPa
    B: 20MPa,0,-80MPa
    C: 0,-20MPa,-80MPa
    D: 80MPa,0,-20MPa