言曲的几个 dditional remarks for bending四 四、横截面上的应力分析( Stress analysis of cross sections) 1与M相应的正应力为( The bending normal stress corresponding to Mv) 2与M2相应的正应力为( The bending normal stress corresponding to M2 C(pN/e C点处的正应力( The normal stress at point C J σ=a+a=1z-2y( Stresses in Beams) (Additional remarks for bending) 四 、横截面上的应力分析（Stress analysis of cross sections) m m z y My x Mz 1.与 My 相应的正应力为( The bending normal stress corresponding to My ) z I M y y = '  2.与 Mz 相应的正应力为(The bending normal stress corresponding to Mz ) y I M z z = ''  C 点处的正应力(The normal stress at point C) y I M z I M z z y y = + = − ' ''    C ( y,z )