Unlock instant, AI-driven research and patent intelligence for your innovation.

Improved contact algorithm-based material point method applied to imprint forming simulation

A material point and mass point technology, applied in the field of imprinting, can solve problems such as virtual contact

Pending Publication Date: 2021-03-16
JIANGSU UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that point-to-point contact will cause virtual contact in the material point method, and to provide a material point method based on an improved contact algorithm applied in imprinting forming simulation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Improved contact algorithm-based material point method applied to imprint forming simulation
  • Improved contact algorithm-based material point method applied to imprint forming simulation
  • Improved contact algorithm-based material point method applied to imprint forming simulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0068] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail in conjunction with the accompanying drawings and examples. The present invention is a material point method based on an improved contact algorithm applied to embossing forming simulation, comprising the following steps:

[0069] Step 1: Establish a mathematical physical model for the embossing process;

[0070] Similar to the finite element method in the imprinting process, the equilibrium governing equation for the coin is as follows:

[0071]

[0072]

[0073] where σ is the Cauchy stress, is the gradient operator, b is the body force per unit mass, ρ is the current material density, ü is the acceleration, i and j represent the components of the space variables, respectively, is the boundary force.

[0074] Step 2: Carry out quadrilateral mesh discretization on the mold;

[0075] The finite element open...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an improved contact algorithm-based material point method applied to imprint forming simulation. The method comprises the following steps: establishing a mathematical physical model for an imprint forming process; performing finite element quadrilateral shell element discretization on the mold; carrying out hexahedron unit discretization on the workpiece, establishing a masspoint set of a blank cake, and establishing a background grid; calculating a background grid node load; mapping physical quantities carried by the mass points to background grid nodes through a background grid shape function; solving a momentum equation and applying boundary conditions; updating physical quantities of the mass points; updating the physical quantity of the background grid node; updating the mold position; judging the penetration state of the material point and solving the penetration distance and the contact force; applying boundary conditions; and calculating the strain increment and spin rate increment of the mass point, solving the stress and elastic-plastic related variables of the mass point according to the constitutive model, and updating the density of the mass point. The bottleneck problem that the time step length is infinitely small in impressing forming finite element simulation is solved through a material point method.

Description

technical field [0001] The invention relates to the technical field of embossing, in particular to a material point method based on an improved contact algorithm applied in embossing simulation Background technique [0002] During the forming process of commemorative coins or coins, craftsmen often eliminate the defects of bright bands and flash lines and determine the size of the embossing force through experience and multiple trial molds. With the replacement of the base cake material, the accumulated experience and the results of multiple trial molds can no longer be used as a reference, and the craftsmen have to repeat the above complicated trial mold work, resulting in a long production cycle and high cost of commemorative coins or coins. At the same time, it also hinders the development of new products and the application of new materials. Therefore, it is of great significance to improve product quality, shorten product design cycle and reduce production cost to use ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G06F30/23G06F119/14
CPCG06F30/23G06F2119/14
Inventor 王运许江平陈笑天
Owner JIANGSU UNIV