When a ductile material is tested, the reduction in cross-sectional area due to waisting causes an increased stress without an increased force, to ensure that extension proceeds uniformly.
当韧性材料被测试时，由于颈缩使横载截面面积减小，以至在受力没有增加的情况下引起应力的增加，以保证延伸继续如常进行。
However, under most conditions this reduction in cross-sectional area is more than offset by the reduction in fatigue failures.
但在大多数条件下，这种在截面区域的减少远远小于疲劳失效的影响。
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