Clamping device of Hopkinson pull bar test-piece and experimental method

Abstract

The invention discloses a clamping device of a Hopkinson pull bar test-piece and an experimental method and belongs to the field of shock dynamics experiment. The experimental device is used in pairs. One end of an adapter is in threaded connection with an incident bar or transmission bar, and the threaded clearance is filled with thread seal tape so as to avoid the damage of shock wave to connecting thread; and the other end of the adapter is provided with a square groove to be connected to a flat test-piece. The square groove which matches the test-piece undergoes plane machining into tiny serrated teeth so as to increase frictional force during clamping. The outer rim of the adapter is processed into taper thread which matches a nut. When the clamping device is in use, clamping force perpendicular to the groove surface is provided by screwing-in the nut. According to the invention, the problem that screw thread is not easy to process in a composite material and high-strength glue is nonuniform during gluing process can be greatly avoided, connection type of a fibrous composite material under dynamic tension is studied, and a forceful foundation is laid for the constitutive relation of the fibrous composite material under dynamic tension.

Description

technical field

[0001] The invention discloses a clamping device and an experimental method for a Hopkinson tie rod test piece, in particular to the clamping mode of the Hopkinson tie rod and the test piece under the impact load of the tie rod, and belongs to the field of impact dynamics experiments. Background technique

[0002] In the dynamic tensile test of metal materials, the connection between the tensile sample and the loading rod is basically threaded. Composite material, as an anisotropic heterogeneous material with a high tensile / shear strength ratio, cannot be realized by direct screw connection, and the stress concentration problem caused by the end effect must be considered, that is, the experimental rod and the specimen The influence of the contact surface. Therefore, in the dynamic tensile experiment, the connection between the experimental rod and the specimen must consider the following issues. ① The stress concentration between the loading rod and the sam...

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