Method and device for measuring r-value of tube in circumferential direction
US12352565B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 2023 |
| Grant date | Jul 8, 2025 |
| Priority date | — |
| Expiry date | Feb 24, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0274
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.