在弹性限度内，应力发光的发光强度与所施应力成正比。
The luminous intensity of stress luminescence is in direct ratio with the applied stress in the elastic limit.
大多数结构材料不仅有弹性，而且在一定限度内具有线性弹性；其变形与负荷成正比。
Most structural materials are not only elastic but within limits, linearly elastic; their deformation is proportional to the load.
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