Adjustable supporting device for Hopkinson test bar piece

Abstract

The invention relates to a bar piece supporting device designed according to the Hopkinson test conditions. The bar piece supporting device mainly consists of adjusting parts, locking nuts, a support frame, an adapter block, a slide block and bar pieces, and is mainly and structurally characterized in that the three adjusting parts capable of freely extending and contracting along shaft lines of the adjusting parts are uniformly distributed on an annular framework, the center space size and the position of the supporting device are adjusted, and further, the center bar pieces are supported, and the axial motion of the bar pieces is limited; the bar pieces are supported by bearings at the end parts of the adjusting parts; and meanwhile, the free axial motion of the bar pieces is realized by utilizing the rotation of the bearings. The bar piece supporting device is formed by the simple parts and has the advantages of simplicity, reliability, small size, large adjustable scope, bearing rolling friction adopted in the bar pieces and small resistance, and the degree of freedom of the bar pieces and the rotation motion along shafts can be effectively limited; meanwhile, the axial motion of the bar pieces can not be influenced basically; and as the adjusting scope of the supporting device self is large, the bar piece supporting device can adapt to the bar pieces of which the diameters are within a certain scope.

Description

technical field [0001] The invention belongs to the field of material dynamic mechanics research, in particular to an adjustable support device for a Hopkinson test rod. Background technique [0002] The separate Hopkinson test device is one of the important methods to study the mechanical properties of materials, and its principle is based on the one-dimensional stress wave. Although the principle and technology of the separate Hopkinson test device have been developed and matured, the test device itself has not been standardized and needs to be further developed. According to the one-dimensional stress wave foundation, the horizontality and coaxiality of the Hopkinson rods are highly required in the test, so the adjustment and support of the rods are very important. At the same time, for the test of different materials, there are also different requirements for the diameter of the rod. Articles entitled "Mechanical behavior of acrylic under high strain rate tensile loadi...

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Problems solved by technology

Articles entitled "Mechanical behavior of acrylic under high strain rate tensile loading" (N.K.Naik, Polymer Testing, 27, 504–512, 2008) and "Combined experimental and numerical analysis of bulge test at high strain rates using split Hopkinson pressure bar apparatus” article (Maziar Ramezani, Journal of Materials Processing Technology, 210, 1061–1069, 2010) uses a gate-type device to support the bar. The accuracy of the seat and the support device itself puts forward higher requirements, and the diameter of the support rod is limited

The article titled "Creep, recovery and high strain rate response of soft roll cover materials" (T.Vuoristo, Mechanics of Materials, 34, 493–504, 2002) adopts a more complex support structure, using the level of the structure and vertical movement to adjust the position of the rod. This method has complex structure and process, high processing cost, and also has restrictions on the diameter of the rod.

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