Fatigue damage estimating method and monitoring device under multi-axis random load

Abstract

The invention provides a mechanical fatigue damage monitoring device and method under a multi-axis random load, which belong to the field of mechanical fatigue damage monitoring. The device mainly comprises a data collecting system (1), a data processing system (2) and a data monitoring system (3). The data collecting system (1) comprises a mechanical key part A2, a strain sensor A1 and a data transmission line A3; the data processing system (2) comprises a data collecting card B1, an alternating current power supply B2, a USB transmission line B3, a power amplifier B4 and an A / D (Analog to Digital) converter B5; and the data monitoring system (3) comprises a computer C1. According to the invention, as a multi-axis fatigue damage estimating theory based on a critical plane method is applied to a monitoring system, common fatigue damage monitoring problems under the multi-axis load in the actual construction are solved; and as shown by a predication result, the fatigue damage under the multi-axis load can be preferably estimated by using the algorithm.

Description

technical field [0001] The invention relates to a mechanical fatigue damage monitoring device and method under multi-axis random loads, belonging to the field of mechanical fatigue damage monitoring. Background technique [0002] Some important components in various aerospace vehicles, pressure vessels, nuclear power plants, power plants and daily vehicles in service are usually subjected to complex multi-axis random or random interactive cyclic loads. In long-time work, mechanical fatigue becomes the main failure mode, and the occurrence of fatigue fracture often brings great economic losses to national production, and even endangers personnel safety. Therefore, monitoring the fatigue damage status of important components in operation has become one of the essential safety assurance methods. [0003] At present, with regard to fatigue damage assessment and monitoring, the main work focuses on uniaxial fatigue. However, the vast majority of engineering structural parts in ...

AI Technical Summary

Problems solved by technology

However, most engineering structural parts in modern industry work under complex multi-axial loading history and harsh environmental conditions, so the traditional uniaxial fatigue strength theory is far from meeting the actual engineering requirements such as major equipment strength evaluation and life prediction.

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