⑩例题 例题1 s11轴向拉压 已知:P=4KN 2P P E=210GPa ② d=10mm A I BLC b h1=l2=100mm 求△ AC 解:画轴力图 N AB段轴力:F1=P AB段变形: P =n(伸长) 4×103×102 0.0024mm EA EA 210×103×=×10已知: P = 4KN l 1 = l 2 =100mm d =10mm E = 210GPa AC 求 l 解:画轴力图 AB段轴力: FN1 = P m m EA Pl EA F l l N 0.0024 10 4 210 10 4 10 10 ( ) 3 2 3 2 1 1 1 1 = = = = 伸长 d A B C P P 2P 1 l 2 l 例 题 1 §11 轴向拉压 例题 ( ) FN P P AB段变形: