Shearing test piece for researching type II fracture of viscoelastic material under condition of high strain rate

Abstract

The invention discloses a shearing test piece for researching type II fracture of a viscoelastic material under the condition of high strain rate. A radial through groove is formed in one end of a cylinder, a radial through convex platform is arranged at the other end of the cylinder, the diameter and height of the cylinder are less than or equal to the diameter of an experimental Hopkinson bar, the radial through groove and the radial through convex platform are parallel to each other, the area of the end surface of the radial through convex platform is equal to the area of the bottom surface of the radial through groove and half of the sectional area of the cylinder, and two ends of the radial through groove are provided with prefabricated cracks along the direction of the side end surface of the radial through groove. The shearing test piece is relatively simple in structure, and meets the requirements on wave propagation in the test piece and a calculation method; the shearing test piece can be used for researching the mechanical properties of metal, brittle and the viscoelastic material in the Hopkinson bar and a quasi static experiment, so that experimental results have comparability.

Description

technical field [0001] The invention belongs to the field of material performance testing, in particular to a shear test piece for studying type II fracture of viscoelastic materials under the condition of high strain rate. Background technique [0002] Since the research on the mechanical properties of materials under static or quasi-static conditions can no longer meet the mechanical properties of materials in various working environments, Hopkinson first proposed the Hopkinson compression bar to study materials under high strain rate stress conditions. The mechanical response of the material is used to study the dynamic mechanical behavior of materials under high strain rates and its mathematical model-material dynamic constitutive relationship. SHPB (Separated Hopkinson Bar) puts forward two basic assumptions: 1. One in the bar 2. Assumption of uniform distribution of stress / strain along the length of the short specimen. [0003] At present, the experimental device has ...

AI Technical Summary

Problems solved by technology

Some existing type II shear specimens can also be applied to the experimental device, but these specimens are limited to most brittle materials of metals, and are not suitable for viscoelastic materials during processing and testing

Images