Dynamic tension fracture experiment method of material

Abstract

The invention relates to a dynamic tension fracture experiment method of a material, which is a manner of striking a target plate (2) with a flying sheet (1) to make the target plate (2) generate lamination crack or damage and is characterized in that the target plate (2) is a double-layer target comprising a first-layer target plate (10) and a second-layer target plate (11) which are clung together and prepared from an identical material; after the flying sheet (1) strikes the first-layer target plate (10), impact waves (3) are respectively generated to the flying sheet (1) and the first-layer target plate (10), when the impact waves arrive at the free surface of the flying sheet (1) and the free surface of the second-layer target plate (11), the impact waves are reflected to form rarefaction waves (4), and two bundles of rarefaction waves (4) move oppositely and encounter in the second-layer target plate (11) or the first-layer target plate (10) so as to generate enough strong tensile stress; and after a certain incubation time, a stress tensile region (5) generates lamination crack or damage to form a lamination crack surface or a maximal damage surface (8).

Description

1. Technical field [0001] The invention belongs to the field of impact dynamics, and in particular relates to a material dynamic tensile fracture test method, through which physical images and data information of material micro-damage evolution with time under strong dynamic loading can be obtained. 2. Background technology [0002] Spallation is a typical form of dynamic tensile fracture failure. Among them, spallation under one-dimensional strain (hereinafter referred to as spallation) is the simplest and most important tensile fracture phenomenon. Because it is a one-dimensional strain problem, the theoretical analysis is relatively simple, and the experiment is also relatively easy to realize; at the same time, it contains a wealth of content about the failure process of materials under strong dynamic loads. Therefore, in the process of understanding the dynamic damage of materials, the problem of plane spallation has always been studied as the main content. [0003] A...

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Problems solved by technology

Under the premise of the current level of testing technology, it is difficult to realize the above-mentioned spallation experiment principle while keeping other factors (stress amplitude, impact hardening effect and loading strain rate, etc.) unchanged, while investigating the physical image of micro-damage evolution over time.

For example, by controlling the speed of the flyer to produce stress loading pulses of different amplitudes, but also changing the loading strain rate, impact hardening effect, etc.; by changing the thickness of the flyer to produce different tensile durations, but also changing the compression Factors such as duration, loading strain rate and impact hardening effect

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