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

A metal sheet, low-velocity impact technology, applied in the direction of testing the strength of materials with one-time impact force, special data processing applications, instruments, etc., can solve the problems of high test cost, complicated analysis method, inconvenient theoretical solution, etc.

Active Publication Date: 2015-11-04
北京堂仁翔科技有限公司
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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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  • Method for predicting size of low-speed impact dent of circular metal sheet
  • Method for predicting size of low-speed impact dent of circular metal sheet
  • Method for predicting size of low-speed impact dent of circular metal sheet

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Embodiment Construction

[0095] Figure 4 It is a flow chart of the method of the present invention. The present invention is implemented in 4 steps, specifically:

[0096] Step 1. Propose the assumptions of a new method for predicting the size of circular metal sheet low-velocity impact pits.

[0097] Assumptions include:

[0098] (1) The shape of the impact pit of the thin metal plate is rotationally symmetric, and the influence of springback deformation on the size of the pit is not considered;

[0099] (2) The Kirchhoff-Love thin plate hypothesis is satisfied, so the influence of out-of-plane normal stress and transverse shear stress can be ignored, mainly radial tensile stress, radial bending stress and circumferential bending stress;

[0100] (3) The material of the metal sheet is an elastic-plastic linear strengthening material, and its stress-strain relationship is as image 3 As shown, the line segment OA is the elastic phase, and the line segment AB is the plastic phase, and the corresponding slopes a...

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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 ...

Claims

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Application Information

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IPC IPC(8): G06F19/00G01N3/30
Inventor 白江波熊峻江刘猛
Owner 北京堂仁翔科技有限公司
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