您的位置:首页  > 论文页面

数值试验多重随机等效平面桁架模型

发表时间:2009-01-31  浏览量:1945  下载量:651
全部作者: 远方,刁可
作者单位: 天津大学建筑工程学院
摘 要: 提出了一种模拟类似混凝土、岩石等非均匀脆性材料破坏过程的新的数值试验模型,称为多重随机等效平面桁架模型。非均匀脆性材料是一类内部充斥着微裂纹、微空隙的非均匀材料,在传统的数值仿真试验中,一般都要划分大量的计算单元来描述这类材料中的微裂纹和微空隙,使仿真数值试验用时较长,在一定程度上限制了技术的广泛应用。通过大量创建计算单元间的联系,而非计算单元本身,多重随机等效平面桁架模型提供了一种在任何尺度上描述材料内部微裂纹、微空隙以及不均匀性的新方法。单轴抗拉、单轴抗压数值试验结果表明:可以应用多重随机等效平面桁架模型模拟混凝土、岩石等非均匀脆性材料的开裂过程,研究分析材料的变形性质和力学性能。
关 键 词: 工程力学;多重随机等效平面桁架模型;数值仿真试验;非均匀脆性材料;自动格子机
Title: Multiple random equivalent plane truss model for numerical test
Author: YUAN Fang, DIAO Ke
Organization: School of Civil Engineering, Tianjin University
Abstract: A numerical approach based on multiple random equivalent plane truss model (MRETM-2D) is developed to simulating the fracture process of heterogeneous brittle material, such as concrete, geological materials and so on. Heterogeneous brittle material, having micro cracks and voids, is inhomogeneous. Generally a large number of computational elements have to be created to simulate those cracks and voids in common numerical test. This would be a time-consuming task and limit the application of this method. By using a large number of connections rather than computational elements, MRETM-2D gives a new method to describe micro cracks, voids and their heterogeneity in any scale level. The results of numerical uniaxial tensile and compression test show that MRETM-2D can satisfactorily simulate the breakage process and analyze the deformation and mechanical properties of heterogeneous brittle material.
Key words: engineering mechanics; multiple random equivalent plan truss model; numerical simulation test; heterogeneous brittle material; cellular automata
发表期数: 2009年1月第2期
引用格式: 远方,刁可. 数值试验多重随机等效平面桁架模型[J]. 中国科技论文在线精品论文,2009,2(2):134-140.
 
0 评论数 0
暂无评论
友情链接