stress against strain graph跟load against extention graph相同吗?

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stress against strain graph跟load against extention graph相同吗?
是在young modulus 的实验中,要画load against extention graph..
材料是铜.每次加200g的砝码.
如果可以,能不能描述一下那幅graph的特点?

load against extention graph应该就是典型的金属试样拉伸曲线图；
而stress against strain graph分为名义应力应变曲线（形状与load against extention graph一样）和真实应力应变曲线（即考虑拉伸过程中达到塑性变形之后的颈缩效应导致的试样截面缩小,可以由名义应力应变曲线转换,具体参见相关资料.）

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