However, the relation between the stress and the strain is nonlinear.

但却明显地表现出非线性的应力-应变关系。

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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。

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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。

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