Pure shear fatigue test device for metal web plate

Abstract

The invention provides a pure shear fatigue test device for a metal web plate, comprising a square metal web plate provided with four chamfer parts and a clamp assebly, wherein the metal web plate comprises a central region and a peripheral region, and the thickness of the peripheral region is greater than the thickness of the central region; and the clamp assembly comprises two clamps for clamping the metal web plate, and each clamp comprises two draw plates arranged mutually in parallel along the horizontal direction, a loading single ear arranged between the two draw plates and fixed to one side of the two draw plates, and a first clamp plate and a second clamp plate arranged between the two draw plates and fixed to the other side of the two draw plates. The device can reduce the damaged probability of a non-fatigue examined detailed part, and completely meets the design requirements of a test for allowable values of a fatigue sheared plate.

Description

technical field [0001] The invention belongs to the design field of fatigue strength devices, in particular to a metal web pure shear fatigue test device comprising a sheared metal web and a clamp assembly. Background technique [0002] Tensile and shear loads are the two main types of loads that cause fatigue damage to aircraft structures. Webs such as ribs, stringers, and beams can have tensile stresses equal to or less than shear stresses. The test method is one of the most common and preferred methods for determining the performance of structures against fatigue loading. The navigation mark HB5287-96 "Metallic Material Axial Loading Fatigue Test Method" stipulates the sample shape of the tensile test piece, the test loading equipment and other related content, but the navigation mark, the national standard and the American ASTM test standard do not specify the shear fatigue test piece. The corresponding design reference standard is given. [0003] The more typical sta...

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Problems solved by technology

However, it is usually difficult to meet the requirements of fatigue strength tests by using these specimens and device types for fatigue tests.

For example, the square device is prone to damage at the loading openings clamped by the web and the rivet holes around the web, and the fatigue test usually hopes to initiate cracks at the design assessment part of the center of the web; the S-shaped tensile device not only itself The geometrical form is complex, and the fatigue weak point is difficult to determine, and if it is to be installed on a standard fatigue testing machine, another set of complicated fixtures needs to be designed

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