Clamp for impact tensile fatigue test of round bar test piece

Abstract

The invention belongs to the technical field of impact fatigue test design of common materials of arresting hooks of carrier-based aircrafts, and particularly relates to a clamp for impact tensile fatigue test of a metal material, which comprises a hammer, a connecting cover plate, a support, a base, a lower chuck, a pressing strip, an adjusting screw and a locking nut. The connection matching mode of the hammer and the base can be changed according to the specific interface information of a testing machine. A lower clamping section of a test piece is connected with the lower chuck through threads, and then is locked by applying pretightening force through an upper nut and a lower nut. An upper clamping section of the test piece penetrates through a central round hole in the top of the support and is locked and fixed by applying pretightening force through double nuts. The cover plate is connected to two anvil blocks of the lower chuck, so that the contact area during impact is increased, and the stress balance of the two anvil blocks is facilitated. The support is fixed on the base through the pressing strip and the adjusting screw. During a test, an impact load applied by the hammer is transmitted to the test piece through the lower chuck, so that impact tensile loading of the test piece is realized. According to the method, the whole set of design and machining is completed, the clamp is successfully applied to a titanium alloy impact tensile fatigue test, and a foundation is laid for fatigue life evaluation of engineering structures bearing the impact load effect in the service process of a shipboard aircraft arresting hook, an ejection rod and the like.

Description

technical field [0001] The invention belongs to the technical field of metal material impact fatigue test design, and specifically relates to a metal material impact tensile fatigue test fixture, on which the metal material impact tensile fatigue test can be carried out, and is used for aircraft carrier-based aircraft arresting hooks, ejection rods, etc. It lays the foundation for the fatigue life assessment of engineering structures subjected to impact loads during service. Background technique [0002] Due to the limited length of the aircraft carrier's runway, the landing of carrier-based aircraft has become a difficult technology. At present, it mainly relies on the arresting cable on the ship's deck to hang on the arresting hook at the tail of the aircraft to quickly reduce the speed of the aircraft and make it safely land on the ship. As a necessary landing arresting system for carrier-based aircraft, the arresting hook is a special key part of carrier-based aircraft. ...

AI Technical Summary

Problems solved by technology

[0006] 1) There is a certain difference in the stress-strain response of the arresting hook of the carrier-based aircraft when it is subjected to impact tensile loads during service, and when it is subjected to impact compression and impact three-point bending loads;

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