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: 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: 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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英文: The paper studied controlling rotor vibration with the super-elasticity of SMA and SFD, set up the new equation of sys tern vibration according to the stress-strain curve of SMA in super-elasticity state, used the nonlinear theory and the dynamic stabilit
中文: 摘要研究利用形状记忆合金的超弹性和挤压油膜阻尼器控制转子振动，利用形状记忆合金在超弹性状态下的应力－应变曲线，建立了新的系统振动方程，运用非线性理论和运动稳定性理论研究转子在形状记忆合金控制下的振动状态，讨论了系统的稳定性条件，获得系统发生分岔时系统参数之间的关系；并提出了通过改变参数来提高系统稳定性和抑制振幅的方法，最后通过仿真验证了改进后的系统振动抑制效果。
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