In-situ biaxial crack growth route auto-tracing measurement system and measurement method

Abstract

An in-situ dual-axis crack propagation path automatic tracking measurement system and measurement method. A cross slide is fixedly installed on the table of the optical platform, and a bidirectional loading device is fixedly installed on the table of the cross slide. The upper part of the bidirectional loading device corresponds to the tested The sample is equipped with an electron microscope for collecting images. The electron microscope is fixedly installed on the coarse and fine-tuning micro-support. The guide rail sliders in the X direction and Y direction are respectively provided with displacement sensors, and the signal terminals of the displacement sensors are connected to the XY bidirectional mobile platform controller. In the bidirectional loading device, a force sensor is respectively installed on the fixtures in the X direction and Y direction. The signal end of the sensor is connected to the controller of the bidirectional loading device, and the controller of the bidirectional loading device and the controller of the XY bidirectional moving platform are respectively connected to the computer. The invention can reveal the crack development process of the material at the microscopic scale.

Description

technical field [0001] The invention relates to a crack measuring device. In particular, it relates to an in-situ biaxial crack propagation path automatic tracking measurement system and measurement method that reveals the crack initiation, propagation, and cracking process of materials at the microscopic scale. Background technique [0002] During the use of structures or components, microscopic cracks will occur due to the action of alternating loads, or due to the combined action of loads and environmental corrosion. Cracks will gradually expand with the increase of alternating load cycles or the prolongation of environmental corrosion time. As the crack size increases, the remaining strength of the structure or element gradually decreases, eventually leading to fracture. Therefore, the force of fatigue damage is much smaller than that of static load damage, and generally there is no obvious deformation during fatigue damage, which is very harmful to engineering structu...

AI Technical Summary

Problems solved by technology

This requires the experimenters to be on guard at all times, waiting for changes, otherwise the crack tip may exceed the field of vision, and it is difficult to judge in which direction the crack tip is beyond the field of vision, it is not easy to track and observe, and it is impossible to accurately draw the expansion path

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