悬臂梁受力如图所示。已知P1=P9=P4=4P,Iz=3.49X107mm4,Iy=6.96X106mm4,材料的许用拉应力[σ]+=30MPa,材料的许用压应力[σ]-=90MPa,则许可荷载[P]为:
A.1605. 8N B.864. 4N C.680. 2N D.7522. 8N正确答案A
悬臂梁受力如图所示。已知P1=P9=P4=4P,Iz=3.49X107mm4,Iy=6.96X106mm4,材料的许用拉应力[σ]+=30MPa,材料的许用压应力[σ]-=90MPa,则许可荷载[P]为:
悬臂梁受力如图所示。已知P1=P9=P4=4P,Iz=3.49X107mm4,Iy=6.96X106mm4,材料的许用拉应力[σ]+=30MPa,材料的许用压应力[σ]-=90MPa,则许可荷载[P]为:
A.1605. 8N B.864. 4N C.680. 2N D.7522. 8N正确答案A