The fatigue test of the bellows expansion joints is replaced by the bent fatigue test of plates when the maximum strain of bent test plates equals to the local strain of bellows expansion joints.
当弯曲试板上的最大应变等于波纹管的最大局部应变时，板的弯曲疲劳试验寿命即可代替波纹管的试验寿命。
The fatigue test of the bellows expansion joints is replaced by the bent fatigue test of plates when the maximum strain of bent test plates equals to the local strain of bellows expansion joints.
当弯曲试板上的最大应变等于波纹管的最大局部应变时，板的弯曲疲劳试验寿命即可代替波纹管的试验寿命。
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