An improved FEM-DEM coupling simulation for granular-media-based thin-wall elbow tube push-bending process

IF 0.3 4区工程技术 Q4 ENGINEERING, MULTIDISCIPLINARY Revista Internacional de Metodos Numericos para Calculo y Diseno en Ingenieria Pub Date : 2023-01-01 DOI:10.23967/j.rimni.2023.05.005

H. Liu, G. M, Z. Geng

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Abstract

The granular-media-based push-bending process has been developed to manufacture thin-wall elbow tube with t/D≤0.01 (the ratio of wall thickness to outer diameter) and R/D≤1.5 (the ratio of bending radius to outer diameter). In the process, a tubular blank is filled with granular media and then pushed into a die to form an elbow shape. To investigate the process, a FEM-DEM coupling model has been developed, in which FEM is used to simulate bending deformation of tubular blank, and DEM is used to calculate contact forces between spherical particles in granular media. In this work, an improved numerical formulation is proposed in order to reach mechanical equilibrium quickly and accelerate the convergence of DEM simulation, when the new contacts are no longer created and the old contacts are no longer deleted in granular media. Using the proposed numerical formulation, the improved FEM-DEM coupling simulation for granular-media-based thin-wall elbow tube push-bending process is less time-consuming than before under the same simulation condition.

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基于颗粒介质的薄壁弯头管推弯过程的改进FEM-DEM耦合模拟

开发了基于颗粒介质的推弯工艺，用于制造t/D≤0.01(壁厚与外径之比)、R/D≤1.5(弯曲半径与外径之比)的薄壁弯头管。在此过程中，管状坯料被填充颗粒状介质，然后推入模具，形成弯头形状。为了研究这一过程，建立了一种FEM-DEM耦合模型，利用FEM模拟管状坯料的弯曲变形，利用DEM计算颗粒介质中球形颗粒之间的接触力。本文提出了一种改进的数值公式，以便在颗粒介质中不再创建新接触和不再删除旧接触时快速达到力学平衡并加速DEM模拟的收敛。在相同的模拟条件下，基于颗粒介质的薄壁弯头管推弯过程的改进FEM-DEM耦合模拟比以前节省了时间。

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来源期刊

Revista Internacional de Metodos Numericos para Calculo y Diseno en Ingenieria 工程技术-工程：综合

CiteScore

0.70

自引率

0.00%

发文量

审稿时长

6 months

期刊介绍： International Journal of Numerical Methods for Calculation and Design in Engineering (RIMNI) contributes to the spread of theoretical advances and practical applications of numerical methods in engineering and other applied sciences. RIMNI publishes articles written in Spanish, Portuguese and English. The scope of the journal includes mathematical and numerical models of engineering problems, development and application of numerical methods, advances in software, computer design innovations, educational aspects of numerical methods, etc. RIMNI is an essential source of information for scientifics and engineers in numerical methods theory and applications. RIMNI contributes to the interdisciplinar exchange and thus shortens the distance between theoretical developments and practical applications.