全级配混凝土二维细观模型的自动生成

将COMSOL软件与MATLAB软件有机结合,提出基于数值图像处理技术和骨料嵌入判别准则的混凝土细观数字模拟方法,实现了全级配混凝土二维细观几何模型和有限元模型的自动生成.骨料的生成主要依据混凝土级配中的骨料粒径分布,骨料的投放以骨料颗粒不相互嵌入为原则.为了验证该方法的有效性,采用4种形状的粗骨料试件进行模拟.结果表明:对于骨料含量高的全级配混凝土细观模拟试件,无论是骨料投放还是有限元网格自动剖分,此方法均可获得较高效率.

Automatic Generation of 2D Mesoscale Models for Fully Graded Concrete

A method which allows for the random structure of aggregates in the numerical simulation of fully graded concrete at a mesoscopic level was developed. Two dimensional geometrical model and the finite element model were automatically generated by coupling the commercial software COMSOL with MATLAB. The generation process was based upon the proposed numerical image processing technology and the different interfacial embedding criterions wherein the aggregate particles were generated from a certain aggregate size distribution and then placed into the concrete specimen in such a way that there was no intersection between the particles. The effectiveness of the proposed method had been assessed by simulating four kinds of coarse aggregate shapes. It is shown that a high efficiency can be achieved in placing aggregates and automatic meshing preprocess for high volume fractions of aggregates in fully graded concrete.