基于数字图像处理技术的沥青混合料微观结构有限元分析(英文)

Microstructural Finite Element Analysis of Asphalt Mixture Using Digital Image Processing

论述一种将沥青混合料微结构和其力学行为仿真联系在一起的方法。该方法利用数字图像处理技术将计算机断层扫描(CT)图像转换为数字格式,并与有限元建模结合,使得根据CT图像建立的有限元模型可以较真实地再现沥青混合料的微结构,进行有限元分析时可以充分考虑沥青混合料颗粒和微空隙分布非均匀特性。计算分析了各向异性和空隙分布对沥青混合料劈裂试验的影响,数值计算结果发现沥青混合料颗粒和空隙分布的非均匀性对拉应力分布影响极大。研究结果表明:采用基于CT图像处理技术的有限元模型进行沥青混合料粘弹特性的研究是可行的。

A methodology for relating the microstructure of asphalt mixture to its mechanical behavior was presented. Digital image processing technique was applied to convert computerized tomography （CT） image into a digital format that can be incorporated into finite element modeling. This CT discrimination based on finite element modeling is used to analyse mechanical behavior of asphalt mixture indirect tensile test by taking into account the actual heterogeneity and microstructures, especially air void distribution. It was pointed that the material heterogeneity and air voids distributions have significant effects on the tensile stress distribution along the loading directions of the specimen. The results indicate that it is feasible to use the finite element model based on CT image and digital image processing techniques to study the viscoelastic property of asphalt mixture.