但是，从颈缩开始，其应力应变关系处于复杂应力状态。
But the stress-strain relationship is in complex stress condition after the necking starts.
应变速率和应力呈非线性关系。
但却明显地表现出非线性的应力-应变关系。
However, the relation between the stress and the strain is nonlinear.
上下翼缘应力与应变关系均为直线。
The relation between stress and strain of upper or lower flange is linear.
上下翼缘应力与应变关系均为直线。
The relation between stress and strain of upper or lower flange is linear.
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