Device and method for measuring high-temperature ejection strength and damage of composite material pin structure

Abstract

The invention discloses a device and a method for measuring high-temperature ejection strength and damage of a composite material pin structure, the device comprises a high-temperature furnace, an ejection sample fixing structure, an ejection strength loading structure and a damage detection structure based on acoustic emission, the ejection sample fixing structure comprises a loading ejector rod and a replaceable ejector pin, and the loading ejector rod is connected with the ejection strength loading structure. The sample outlet fixing structure comprises a fixing clamp and a fixing clamp upper cover plate, the middle of the fixing clamp and the middle of the fixing clamp upper cover plate are each provided with a vertically-through testing window, the ejection strength loading structure comprises a clamping ring and a high-temperature waveguide rod, and the clamping ring is clamped and fixed to the upper portion of a loading ejection rod located outside the high-temperature furnace. Cooling devices are arranged on the high-temperature waveguide rod and the loading ejector rod; and the cooling devices are used for cooling the high-temperature waveguide rod and the loading ejector rod. The problem that the ejection strength of the composite material pin connection structure and the damage to the sample are difficult to detect at the same time in a high-temperature environment is solved, the accuracy of test data is ensured, the test reliability is improved, and the test cost is reduced.

Description

technical field [0001] The invention relates to the field of mechanical testing of composite materials, in particular to a device and method for measuring the high-temperature ejection strength and damage of a composite material pin structure. Background technique [0002] The composite pin connection structure has the advantages of simple structure, high connection strength and high reliability. It is an important connection technology for preparing complex components of composite materials, and has been widely used in the aerospace field. The composite pin connection structure is subjected to complex stress during use, and it is easy to become the weakest area. This situation is particularly prominent in the ceramic matrix composite pin connection structure working in a high temperature environment. Therefore, the accuracy of the mechanical performance test results of the composite pin connection structure at room temperature and high temperature is directly related to the...

AI Technical Summary

Problems solved by technology

Some researchers have conducted ejection strength tests on composite pins, but the test device is centered by manual visual inspection, which has large visual errors, and is only suitable for ejection strength measurements at room temperature

Images