sagging moment meaning in English

下垂力矩
下垂弯曲力矩
正弯矩
中垂力矩

3 ) based on the asymmetrical beam bending theory , the deflections of damaged hull subjected to hogging and sagging moments and shear forces are analyzed accounting for the external loads listed from previous chapter . the effect of shearing deflection on total hull deflection is discussed
3 )在非对称弯曲梁模型的基础上，考虑外载荷变化下，计算了宏观破损后船体弯曲挠度和剪切挠度，并分析了剪切挠度对总挠度的影响。