对于没有明显特征的材料 屈服点 在它们的应力-应变曲线上,例如铝或高强度钢,工程上等同于“屈服强度”。它被定义为 压力 需要产生少量特定量的永久(塑性)变形,通常为原始标距长度的 0.2%。该值 [latex]sigma_{0.2}[/latex] 在设计计算中用作材料的实际弹性极限。

(图片仅供参考)
对于没有明显特征的材料 屈服点 在它们的应力-应变曲线上,例如铝或高强度钢,工程上等同于“屈服强度”。它被定义为 压力 需要产生少量特定量的永久(塑性)变形,通常为原始标距长度的 0.2%。该值 [latex]sigma_{0.2}[/latex] 在设计计算中用作材料的实际弹性极限。
Many engineering materials, particularly ductile metals like aluminum alloys, copper alloys, and certain types of steel, do not exhibit the clear, sudden yielding behavior seen in mild steel. Their stress-strain curve transitions from elastic to plastic behavior gradually. For design and safety purposes, engineers need a consistent point to define the onset of permanent deformation. This is where proof stress, also known as offset yield strength, becomes crucial. To determine it, a tensile test is performed while plotting stress versus strain. A line is drawn on this graph parallel to the initial linear (elastic) portion of the curve, but offset from the origin by a specified strain value, most commonly 0.2% (or 0.002 strain). The stress at which this offset line intersects the stress-strain curve is defined as the 0.2% proof stress ([latex]\sigma_{0.2}[/latex]).
该值是衡量材料弹性极限的一种实用且可重复的方法。它表示,如果材料被加载到该应力水平后卸载,则其将发生0.2%的永久变形。虽然发生了一些塑性变形,但其程度足够小,可以满足许多结构应用的需求。这种约定使得工程师能够使用没有明显屈服点的材料设计部件,并遵循与具有明显屈服点的材料相同的安全性和可靠性原则,从而确保结构在设计载荷下不会发生永久变形。
屈服强度
(如果日期未知或不相关,例如“流体力学”,则提供其显著出现的近似估计)
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