In-situ measurement device for dynamic fracture stress intensity factor of material in humid and hot environment

Abstract

The invention discloses an in-situ measurement device for a dynamic fracture stress intensity factor of a material in a humid and hot environment. The device comprises a humid and hot environment box;a first transparent window and a second transparent window are mounted on the humid and hot environment box; an environment control system is connected with the humid and hot environment box; the humid and hot environment box is connected with a loading device; the loading control system is connected with the loading device; a clamp is connected to the center of the humid and hot environment box;a sample is installed on the clamp; the clamp is connected with the loading device; the laser, the beam expander and the first collimating mirror are arranged in front of the humid and hot environment box; the second collimating mirror and the high-speed camera are arranged behind the humid and hot environment box; and the loading control system, the environment control system and the high-speedcamera are connected with the computer. By collecting image information of laser after passing through the sample, the stress intensity factor of the material before and after stress is calculated based on the photomechanical principle, and then mechanical behaviors such as crack initiation, expansion and failure of the material in service in a humid and hot environment can be monitored in real time.

Description

technical field [0001] The invention relates to an in-situ measuring device for the dynamic fracture stress intensity factor of a material in a hot and humid environment, and belongs to the technical field of material mechanics. Background technique [0002] The existing mechanical behavior of materials is measured in a conventional environment, or placed in a temperature box after moisture absorption and saturation, and there is a lack of in-situ mechanical performance measurement devices in a humid and hot environment. In particular, there has been no report on an experimental setup that can measure the dynamic fracture properties of materials in a hot and humid environment in situ. [0003] However, quantitative testing and characterization of crack initiation, growth and failure of materials under dynamic loading is extremely important for material mechanical design, reliability design and safe service. Contents of the invention [0004] The invention provides an in-s...

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Problems solved by technology

[0004] The invention provides an in-situ measuring device for dynamic fracture stress intensity factors of materials in hot and humid environments, which is used to overcome the defect that the dynamic fracture of materials in hot and humid environments cannot be measured in situ in the prior art

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