Monitoring system for crack growth conditions of pressure vessel containing vertical internal crack defects

Abstract

The invention discloses a monitoring system for crack growth conditions of a pressure vessel containing vertical internal crack defects, which belongs to the technical field of safety analysis of pressure vessels. The monitoring system comprises a sensor unit and an arithmetic unit. The sensor unit is connected with the arithmetic unit and sends monitored information to the arithmetic unit. The arithmetic unit comprises a strain value calculation module, which is connected with the sensor unit, acquires the data of the outer surface of the container detected by the sensor unit and calculates a corresponding strain value according to the data; a depth calculation module, which is connected with the strain value calculation module, acquires the strain value and calculates the depth of an internal crack of the container according to the strain value; a stress intensity factor calculation module, which is connected with the depth calculation module, acquires the value of the crack depth and calculates the value of a stress intensity factor at the tip of the crack according to the value of the crack depth; and a determination module, which is connected with the stress intensity factor calculation module, acquires the value of the stress intensity factor at the tip of the crack and compares the value with a fracture toughness value of a material from which the pressure vessel is made; wherein comparison results output by the determination module characterize the state of the crack and indicate whether the pressure vessel should be on service. According to the invention, the growth state of the crack is obtained through rational detection and calculation; and the safe service situation of the pressure vessel is determined, and high reliability is obtained.

Description

technical field [0001] The invention relates to the technical field of pressure vessel safety analysis, in particular to a crack extension monitoring system for pressure vessels with longitudinal internal crack defects. Background technique [0002] Pressure vessels are special pressure-bearing equipment with explosion hazards. The media they contain are often high-temperature, high-pressure, flammable, and explosive. Once leakage or explosion occurs, catastrophic accidents often occur, causing huge losses to people's lives and property. And directly affect social stability. [0003] For pressure vessels in high temperature, high pressure and corrosive environments, many engineering materials will inevitably have cracks during service, and the expansion of these cracks may lead to serious safety accidents. The development of modern material science and fracture mechanics has proved that materials with certain defects still have certain working ability, as long as the crack ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a crack growth monitoring system for pressure vessels containing longitudinal internal crack defects, which solves the technical problems of complicated monitoring and evaluation operations and low evaluation reliability of cracks in pressure vessels containing cracks in the prior art, and achieves the improvement of cracks. Monitor technical effects on efficiency and reliability