Fatigue test design method of aircraft engine suspension joint

Abstract

The invention discloses a fatigue test design method of an aircraft engine suspension joint and belongs to the technical field of aircraft structural part fatigue tests. The method comprises the following steps of: firstly, obtaining suspension joint load under respective load conditions; secondly, distributing the suspension joint load according to a rigidity ratio of rims on the suspension joint to simplify the structural form of a test piece; during a test, loading the suspension joint by using a two-way independent loading way; monitoring the state of the to-be-checked part of the suspension joint to acquire experimental data; and finally, comparing the acquired experimental data and a theoretical analysis result and correcting a calculation model and a calculation result. The fatigue test design method simplifies the test piece according to a law of load distribution according to stiffness, monitors the test piece and corrects the calculation model and the calculation result by using a smart coating and a strain gauge, achieves a test checking and monitoring purpose, and simplifies a test scale and reduces test cost.

Description

technical field [0001] The invention belongs to the technical field of fatigue tests of aircraft structural parts, and in particular relates to a fatigue test design method for hanger joints of aircraft engines. Background technique [0002] The aircraft engine suspension joint is used to suspend the engine, which is subjected to a relatively large force and needs to be subjected to a fatigue test. Usually, the aircraft engine suspension joint is a lug joint. [0003] The core of the aircraft lug joint structure fatigue test is usually reflected in the planning and formulation of the test program. When formulating the test plan, the designer must do comprehensive theoretical analysis and finite element calculation to ensure that the test plan can not only simulate the real loading state of the test piece, but also take into account the implementation and monitoring of the test. [0004] For the one-way connection joint structure, the position and direction of the load actio...

AI Technical Summary

Problems solved by technology

However, for the connection joint structure with a structure like the engine suspension joint and a complex stress state, the joint load and the direction of the action point are different under different load conditions, so it is impossible to load through the one-way actuator, and the test implementation often requires a lot of time. One actuator is used for collaborative loading, and the test implementation often requires multiple actuators for coordinated loading. For the above-mentioned specific lug joint structure, considering the scale of the test piece and the test cost, it is impossible to carry out the test according to the large component level support method.

In order to simplify the test, the relevant

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