bending moment arm
... bending modulus 弯曲模量 bending moment arm 弯曲力臂 bending moment 挠矩 ...
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试验表明，这是由于管道受载后，裂纹处管道截面变椭圆及由于管道弯曲变形导致加载过程中力臂的变化所引起。
It is mainly caused by the ovalization of the cracked cross section and the changing of the lever-arm while the pipe is deformed when being bended.
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