以下为句子列表：
英文: At the same time, the PUR foam plastics has some brittle features and its stress-strain curve is obviously nonlinear characteristics when it is deformed.
中文: 在拉伸加载下泡沫塑料具有明显的脆性变形特征，其应力－应变曲线存在明显的非线性。
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英文: But the stress-strain relationship is in complex stress condition after the necking starts.
中文: 但是，从颈缩开始，其应力应变关系处于复杂应力状态。
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英文: Consequently, although the initial part of the unloading stress-strain curve might be approximately linear, this did not mean that the system response was elastic, as frequently assumed in continuum theories.
中文: 因此，尽管在卸载应力应变曲线的初始段约为线性，但这并不意味着颗粒系统的响应如传统连续力学中假定的那样为弹性。
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英文: Experiments are carried out to determine the high-temperature mechanical properties, such as yield strength, tensile strength, elongation, Poisson ratio and stress-strain relationship, of fire-resistant steel made by the Maanshan Iron &Steel Co.
中文: 摘要为了得到高温下耐火钢的材料特性，对马钢集团开发的耐火钢在高温下的力学性能进行了试验研究。
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英文: For metals that experience the gradual elastic-plastic transition, the point of yielding is determined as the initial departure from linearity of the stress-strain curve and this is sometimes called the proportional limit.
中文: 对于金属逐步的弹塑性形变转变，其屈服点确定为应力－应变曲线非线性关系的开始，这个点也被称为比例极限。
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