Variable pressing head dynamic pressing test device based on Hopkinson pressing rod system

Abstract

The invention discloses a variable pressing head dynamic pressing test device based on a Hopkinson pressing rod system, which can realize in-situ test of the dynamic mechanical property of a material.A structure of the pressing device is: a pressing head is in seamless joggle joint with a pressing head supporting object made of a material the same as that of the pressing head; the tail end of thepressing head supporting object and an incident rod end coaxially through a screw rod; a cushion block made of a material the same as that of the incident rod is placed between the tail end of the pressing head supporting object and the incident rod end; the material of each section of the screw rod which is screwed into the cushion block / incident rod and the pressing head supporting object is the same as that of the supporting object; in addition, the tail end of the pressing supporting object adheres to the cushion block as well as the interface of the cushion block and the incident rod end; the pressing head supporting object and the end part of the incident rod are in sleeving connection through a polytetrafluoroethylene sleeve; the variable pressing head dynamic pressing test devicebased on the Hopkinson pressing rod system can realize dynamic pressing test based on the traditional Hopkinson pressing rod device, and is reasonable and reliable in structural design, the pressing head is convenient to disassemble, assemble and replace, and the accuracy of the dynamic pressing test is guaranteed under the condition of meeting wave impedance matching, so that a dynamic mechanicalproperty test method of the material is enriched.

Description

technical field [0001] The invention relates to the field of dynamic indentation mechanical testing devices, in particular to a dynamic indentation testing device with a variable indenter based on a Hopkinson pressure bar system applied to a dynamic mechanical testing system. Background technique [0002] Engineering materials used in aerospace, national defense engineering and other fields are often subjected to short-term strong dynamic loads, and their mechanical responses under high loading rates are significantly different from those under quasi-static loading. To carry out testing and characterization of dynamic mechanical properties of engineering materials under dynamic loads Research contributes to its design and application in engineering. [0003] At present, a series of split Hopkinson bars (split Hopkinson bar) (tension, compression, torsion bars, etc.), Taylor impact, expansion ring, drop hammer, and light gas gun plate impact have been developed. The mechanica...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of non-replaceable indenter, inflexible test and large result error in the existing dynamic indenter test device, the present invention provides a variable indenter dynamic indenter test device based on the Hopkinson pressure bar system

Images