Method and device for measuring yield limit of super-high pressure thick-wall cylinder

Abstract

According to the regularities of distribution of stress-strain of a super-high pressure thick-wall cylinder and characteristics of a plastic layer and an elastic layer of the cylinder, a static super-high pressure value provided by a hydraulic system thick wall cylinder is increased by equal step, and is loaded inside the cylinder to be measured; and an initial yield pressure of the super-high pressure cylinder is determined according to whether strain of the unloaded cylinder changes. Therefore, the invention provides an efficient quick method and a device for measurement of yield limit of the super-high pressure thick-wall cylinder.

Description

technical field [0001] The invention relates to the measurement of the yield limit of a cylinder, in particular to a method and device for measuring the yield limit of an ultra-high pressure thick-walled cylinder. technical background [0002] Ultra-high pressure thick-wall cylinders are widely used in petrochemical, artificial crystal, synthetic diamond isostatic pressure treatment, ultra-high pressure hydrostatic extrusion, powder metallurgy, metal forming and geological research and other fields. How to quickly and effectively measure the yield pressure of the cylinder is of great significance to practical engineering applications. The existing methods for determining the yield limit of materials are mainly tensile tests, which have the following defects: (1) The structural dimensions of tensile test pieces must meet the national standards; (2) The tested materials should have obvious plastic characteristics. [0003] Since the determination of yield limit by tensile...

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Problems solved by technology

The existing methods for determining the yield limit of materials are mainly tensile tests, which have the following defects: (1) The structural dimensions of the tensile test pieces must meet the national standards; (2) The tested materials should have obvious plastic characteristics

[0003] Since the determination of yield limit by tensile test is suitable for specimens with obvious plastic characteristics and structural dimensions in compliance with national standards, for special working conditions where material structural dimensions do not conform to national tensile test specimen standards, material plasticity is not obvious, or material yield limit attenuation is caused (such as corrosive medium environment), the tensile test is not suitable for the determination of the yield limit of this type of material

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