能量滤( Energy Methoc 513-2杆件变形能的计算 Calculation of strain energy for various types of loading 、杆件变形能的计算( Calculation of strain energy for various types of loading) 1.轴向拉压的变形能( Strain energy for axial loads) 当拉力为F1时,杆件的伸长为81 当再增加一个dF1时,相应的变形增量为d(A1) 此外力功的增量为: dEl dW=F1d(Ml1)d(△1)=EA共1页 5 (Energy Method) §13-2 杆件变形能的计算 ( Calculation of strain energy for various types of loading ) 一、杆件变形能的计算（Calculation of strain energy for various types of loading） 1.轴向拉压的变形能（Strain energy for axial loads) 此外力功的增量为： d d(Δ ) 1 1 W = F l EA F l l 1 1 d d(Δ ) = 当拉力为F1 时,杆件的伸长为l1 当再增加一个dF1时,相应的变形增量为d(Δl1 )