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Abstract

A method for measuring an r-value of a tube in a circumferential direction: determine a size of an annular sample, and cutting the sample from a to-be-measured tube; making speckles or circular grids on an outer surface of the sample; sleeving the annular sample in a middle of an outside of a ring segmented rigid die; filling a liquid bag with a fluid medium and controlling an internal pressure, and driving the ring segmented rigid die to move outward uniformly in a radial direction using a uniformly distributed load generated by pressurizing the liquid bag, so as to cause equal diameter bulging of the annular sample; measuring strain in width and circumferential directions in a speckle or circular grid region on the annular sample; and determining the plastic strain ratio of the tube in the circumferential direction according to the strain in the width and circumferential directions.

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First Claim