Span-adjustable bending test clamp with positioning function

Abstract

The invention discloses a span-adjustable bending test clamp with a positioning function, and belongs to the technical field of aircraft structure bending tests. The clamp comprises two clamp upper fulcrums, two clamp lower fulcrums, an upper clamp guide rail platform, a lower clamp guide rail platform and an acting barrel. The upper clamp guide rail platform and the lower clamp guide rail platform are provided with sliding rails respectively and provided with scales in the direction of the sliding rails. Threaded holes are formed in the sliding rails. The clamp upper fulcrums and the upper clamp guide rail platform are in sliding connection and are fixed through bolts. The clamp lower fulcrums and the lower clamp guide rail platform are in sliding connection and are fixed through bolts. The lower clamp guide rail platform is fixed to a test machine loading frame through a test machine lower chuck. The upper clamp guide rail platform is fixedly connected with the acting barrel through a test machine upper chuck. The problems that when large-load and large-deformation bend tests are carried out, the span of clamp fulcrums cannot be adjusted, and a clamp cannot adapt to test piece size changes or meet design requirements are solved.

Description

technical field [0001] The invention belongs to the technical field of aircraft structure bending tests, in particular to a bending test fixture with adjustable span and positioning function. Background technique [0002] There are a large number of beam structures in aircraft wing structures to resist bending loads and deformations. The determination of the bending performance data of materials and structures through three-point and four-point bending tests is the basic premise for reliability design, analysis and verification in the fields of aerospace, transportation, machinery and chemical industry. During the process of take-off-cruising-landing, the mid-spar structure of the wing mainly bears the repeated action of bending load, which is prone to fatigue failure. Sometimes under the action of gust load, the wing structure will be greatly deformed, which is not conducive to the safe control and normal flight of the aircraft. In addition, in the current aircraft struct...

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Problems solved by technology

[0004] In order to solve the above problems, the present invention proposes a bending test fixture device that can meet the requirements of three-point and four-point bending tests at the same time, is adjustable in span, easy to replace, has a positioning function, and can be used repeatedly. In the development of the No. 1 bending test fixture, the span is fixed and easy to wear, and the positioning accuracy of the test piece is insufficient, forming the test capability for large deformation, large load and high-precision control of the new bending test piece

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