Composite material fracture toughness test device

Abstract

The invention provides a composite material fracture toughness test device, comprising an actuating rod, a first rolling shaft support, a sample piece clamping component, a second rolling shaft support and a bracket, wherein the sample piece clamping component is fixed between the actuating rod and the bracket, the first rolling shaft support is located at the bottom of the actuating rod and is fixedly connected with the actuating rod, the second rolling shaft support is fixed on the bracket, the first rolling shaft support is located between the second rolling shaft support and the sample piece clamping component, and an actuating mechanism for driving the actuating rod to move downward is arranged above the actuating rod; the first rolling shaft support comprises a connection seat and asupporting shaft; and the structure of the second rolling shaft support is the same as that of the first rolling shaft support. The composite material fracture toughness test device according to the invention completes a fracture toughness test in a tensile direction through a compression mode, and can adjust different test torques and test fulcrum positions to meet the requirements of sample pieces of different sizes and different test conditions.

Description

technical field [0001] The invention belongs to the field of fracture toughness testing, in particular to a composite material fracture toughness testing device. Background technique [0002] At present, lightweight composite materials have been more and more involved in practical engineering applications, and their mechanical behaviors under complex stress conditions have attracted more and more attention in engineering, especially their fracture failure and fracture toughness. With the increasing design accuracy of various composite materials, the testing and characterization of the fracture toughness of composite materials has become an inevitable requirement for engineering product development. However, most of the current test methods are cantilever beam tests. During the test, the actuation trajectory of the actuating end cannot be strictly controlled, and since the actuation torque is determined by the size of the sample, the crack propagation of the sample during the...

AI Technical Summary

Problems solved by technology

[0004] Existing testing institutions conduct fracture toughness testing through tensile action. During the testing process, the rear part of the sample is free and the stability is poor, and the cracks expand during the testing process. The torque keeps changing throughout the testing process, and the fracture toughness of the material cannot be accurately calculated.

At the same time, the existing testing mechanism cannot adjust the working dynamics and fulcrum position with the sample, and cannot meet the testing requirements of different sizes and different conditions

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