Method for predicting size of low-speed impact dent of circular metal sheet

Abstract

The invention provides a method for predicting the size of a low-speed impact dent of a circular metal sheet. The method has the advantages of simplicity and convenience for calculation, high precision and the like. The technical scheme adopted by the invention is as follows: providing assumed conditions of a new method for predicating the size of the low-speed impact dent of the circular metal sheet; determining a deformation function of the impact dent according to a loaded form and dent features during low-speed impact of the circular metal sheet; further establishing a corresponding stress-strain relation by the provided deformation function of the impact dent of the circular metal sheet; according to a functional principle, establishing a control equation of the circular metal sheet in a low-speed impact condition, solving undetermined parameters of the control equation with a numerical solution method, and at last the size of the impact dent of the metal sheet is very conveniently determined.

Description

Technical field [0001] The invention provides a method for predicting the size of a circular metal sheet low-speed impact pit, which belongs to the field of mechanical design. Background technique [0002] Sheet metal is often susceptible to accidental low-speed impact events such as sand, gravel, maintenance tools, etc., resulting in unrecoverable plastic deformation, forming impact pits, directly affecting its static strength and fatigue properties. Therefore, such low-speed impact collision phenomena need to be evaluated The size of the impact pits of the sheet metal under low-velocity impact is one of the critical input parameters for designers, especially for material selection and size design. Therefore, how to obtain the size of the impact pits of the sheet metal under low-velocity impact is always It has always been a problem that engineers need to solve. Through the low-speed impact test of thin metal plates, the impact pit size can be directly determined, but the test ...

AI Technical Summary

Problems solved by technology

The size of the impact crater can be directly measured through the low-velocity impact test of the metal sheet, but the test cost is relatively high, and it is time-consuming and labor-intensive. Especially in the initial design stage, the size of the impact crater under any material, size and impact speed is passed. Experimental determination is impractical; the finite element numerical simulation method needs to establish a complex finite element model, the calculation is complicated, and the calculation efficiency is low; some existing analytical methods are relatively complicated, and the theoretical solution is inconvenient

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