Anti-bending fixture and design method for single-lap riveted joints

Abstract

The invention relates to a single lap riveted joint anti-bend fixture which is characterized by comprising an upper clamping plate, a lower clamping plate and a single lap joint test piece, wherein the lower clamping plate comprises a first clamping plate section at a fixing end and a second clamping plate section at a riveting end; the single lap joint test piece is fixedly riveted with the second clamping plate section of the lower clamping plate by virtue of rivets; the upper clamping plate and the first clamping plate section of the lower clamping plate are fixed by a countersunk screw. The invention further relates to a design method of the single lap riveted joint anti-bend fixture. The design method comprises the following steps: 1) determining a thickness of the single lap joint test piece and a diameter of a rivet mounting hole according to test requirements; 2) calculating to analyze the maximum turning angle and maximum deflection at the single lap riveted joint; 3) optimizing and determining the thickness of the upper clamping plate. The single lap riveted joint anti-bend fixture disclosed by the invention is scientific and reasonable in structural design and convenientto clamp, excessive bending deformation of the single lap riveted joint can be effectively avoided, and the influence of bending on fatigue test results are avoided.

Description

technical field [0001] The invention belongs to the technical field of fatigue experiments and relates to a single-lap riveted joint anti-bending fixture and a design method thereof. Background technique [0002] The single-lap riveting connection method is widely used in various mechanical connection components, especially in the aircraft skin riveting structure. These connection parts are dangerous parts of aircraft structure fatigue and need to be verified by fatigue tests. In practical applications, most of the single-lap riveted joints are large-area multi-rivet plates, and the bending of the riveted joints is alleviated. However, since the two joints of single lap riveting are not on the same plane after all, and the length of the experimental specimen is limited, the force of the two joints in the riveting fatigue test is obviously not on the same plane, resulting in bending deformation of the single lap riveting joint If the length of the test piece is too short, it...

AI Technical Summary

Problems solved by technology

However, since the two joints of single lap riveting are not on the same plane after all, and the length of the experimental specimen is limited, the force of the two joints in the riveting fatigue test is obviously not on the same plane, resulting in bending deformation of the single lap riveting joint Phenomenon, if the length of the test piece is too short, it will have a great influence on the test results, and it is not realistic

Some of the existing anti-bending fixtures for single-lap riveted joints use additional anti-bending devices to prevent out-of-plane bending of the test piece, which will cause distortion of test results and affect actual use. The bending fixture has problems such as complex structure and inconvenient clamping

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