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Offset yield strength. Arbitrary approximation of elastic limit. It is the stress that corresponds to the point of intersection of a stress-strain diagram and a line parallel to the straight line portion of the diagram. Offset refers to the distance between the origin of the stress-strain diagram and the point of intersection of the parallel line and the 0 stress axis. Offset is expressed in terms of strain (often 0.2%).
残余变形屈服强度。是指弹性极限的任意近似。它是应力对应于应力应变图与平行于该图的直线部分的直线的交点。偏移量是指应力应变图的原点和平行线与零应力轴的交点之间的距离。偏移量用应变表示(通常为0.2%)。
Olsen cup test. Method for measuring metal ductility by determining cup height. A sheet metal blank, restrained on all edges, is deformed by pressing a specified steel ball at its center. Height (or depth) of the cup when rupture occurs is reported in thousandths of an inch.
Olsen杯突试验。通过测定杯突高度来测量金属韧性的方法。该试验是将一个所有边缘均受约束的指定钢球压入钣金坯料的中心，使其变形。当断裂发生时，杯突的高度(或深度)以千分之一英寸记录。
Operating stress Stress imposed on a part in service.
工作应力。施加在服务部件上的应力。
Overstressing. Application of high fluctuating loads at the beginning of a fatigue test and lower loads toward the end. It is a means for speeding up a fatigue test.
超限应力。在疲劳试验开始时施加较高的脉动负荷，而在试验结束时施加较低的脉动负荷。这是加速疲劳试验的一种手段。
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