Wp=Ip/R, Wp称为___________________
举一反三
- 设直径分别为d和D的两个实心圆截面,其极惯性矩分别为IP1和IP2、抗扭截面模量分别为WP1和WP2。则内、外径分别为d、D的空心圆截面的极惯性矩IP 和抗扭截面模量WP分别为() A: IP = IP2 – IP1,WP = WP2 – WP1 B: IP = IP2 – IP1,WP ≠ WP2 – WP1 C: IP ≠IP2 – IP1,WP = WP2 – WP1 D: IP ≠IP2 – IP1,WP ≠WP2 – WP1
- 设直径分别为d和D的两个实心圆截面,其极惯性矩分别为IP1和IP2、抗扭截面模量分别为WP1和WP2。则内、外径分别为d、D的空心圆截面的极惯性矩IP 和抗扭截面模量WP分别为( )。 A: IP = IP2 - IP1,WP = WP2 - WP1; B: IP = IP2 - IP1,WP ≠ WP2 - WP1; C: IP ≠IP2 - IP1,WP = WP2 - WP1; D: IP ≠IP2 - IP1,WP ≠WP2 - WP1。
- 设空心圆轴的内径为d,外径为D,d/D=α,则其横截面的极惯性矩Ip和抗扭截面模量Wp的表达式为( ) 。 A: Ip=1/32 π(D4-d4), Wp =1/16 π(D3-d3) B: Ip=1/32 πD4(1-α4), Wp =1/16 πD3(1-α3) C: Ip=1/32 πD4(1-α4), Wp =1/16 πD3(1-α4) D: Ip=1/64 πD4(1-α4), Wp =1/32 πD3(1-α3)
- 高级优质碳素钢S、P的含量分别为( )? WS≤0.035%、WP≤0.035%|WS≤0.030%、WP≤0.020%|WS≤0.020%、WP≤0.030%|WS≤0.030%、WP≤0.030%
- 普通钢的硫含量()、磷含量() A: ws≤0.045%;wP≤0.045% B: ws≤0.035%;wP≤0.035% C: ws≤0.020%;wP≤0.020% D: ws=0;wP=0