求助一道预应力金属波纹管的题目 [复制链接]

直径为55mm,长1m金属波纹管径向刚度（集中荷载）数据如下：ƒ‡Ï nkRFbbs.3c3t.com©öJÞ@½¡Ã×
ƒ‡Ï nkRFbbs.3c3t.com©öJÞ@½¡Ã×
   荷载  50N    100N    200N    400N    600N     800Nƒ‡Ï nkRFbbs.3c3t.com©öJÞ@½¡Ã×
ƒ‡Ï nkRFbbs.3c3t.com©öJÞ@½¡Ã×
   表1   3.36    3.87    5.63     6.40      7.45      9.67ƒ‡Ï nkRFbbs.3c3t.com©öJÞ@½¡Ã×
   表2  21.48   22.27  25.26   26.51    28.26    32.09ƒ‡Ï nkRFbbs.3c3t.com©öJÞ@½¡Ã×
ƒ‡Ï nkRFbbs.3c3t.com©öJÞ@½¡Ã×
请问下变形平均值是多少啊？（附上计算过程，谢谢）ƒ‡Ï nkRFbbs.3c3t.com©öJÞ@½¡Ã×