金属材料形变硬化指数测定实验

1.实验数据记录及处理

原始数据记录与处理表Ai0.1Ri(Mpa)435.18εi0.095320钢σi(Mpa)478.7Xi-1.02Yi2.68Ai0.075Ri(Mpa)493.46εi0.0723铝σi(Mpa)530.47Xi-1.14Yi2.7250.125461.590.1178519.29-0.932.7150.1530.650.0953583.72-1.022.7660.15477.580.1398549.22-0.852.740.125556.070.1178625.58-0.932.7960.175487.040.1613572.27-0.792.7580.15572.550.1398658.43-0.852.8190.2492.20.1823590.-0.742.7710.175582.20.1613684.09-0.792.8350.225494.570.2029605.85-0.692.7820.25494.760.2231618.45-0.652.791 n根据Holloman公式，即 k ○2

：真实应力（MPa）；：真实应变；k ：强度系数（MPa）；n:硬化指数 将上式两边取对数得，lglgknlg ○3

所以，只要通过作lglg曲线，拟合直线，得到的直线斜率就为硬化指数n。

2.实验结果

硬化指数及可靠度参数表20钢铝k(Mpa)nS(n)V(n)Q978.360.29850.04010.13420.99491230.60.31860.05870.18420.99 附：真实应力-应变对