基于CT技术和有限元方法的沥青混合料数值蠕变试验研究

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大连海事大学学报 ›› 2014, Vol. 40 ›› Issue (1) : 123-127.

王聪^1,2,郭乃胜^1,2 ,赵颖华^1,2,谭忆秋³

作者信息 +

Numerical creep test of asphalt mixture based on X-ray computed topography and finite element method

WANG Cong^1,2, GUO Nai-sheng^1,2, ZHAO Ying-hua^1,2, TAN Yi-qiu³

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文章历史 +

摘要

考察沥青混合料黏弹性的试验方法较多，在处理疲劳破损时，通常采用蠕变试验.其中，单轴静载蠕变试验被大量用于分析沥青混合料的黏弹性能，但是室内蠕变试验对试验仪器精度要求较高，而且耗费大量时间、人力和财力.WANG L B［1］提出利用CT X-ray技术（CT技术）、有限元或离散元数值工具及高效率的计算手段，对材料性能进行数值模拟以节省大量成本.因此，基于CT技术和有限元方法或离散元方法，建立反映材料真实内部结构的非均质数值模型成为分析沥青混合料性能的研究趋势.

Abstract

To analyze the effect of homogeneous model and heterogeneous model on the results of numerical simulation and the choice of optimum test section in creep test under two-dimension numerical condition, X-ray computed technique and digital image processing technique were performed and the Burgers model was adopted to characterize the viscoelasticity of asphalt mortar and asphalt mixtures, and furthermore numerical model was established based on finite element method to study creep behaviors for homogeneous model and heterogeneous model and analyze the location of the optimum test section through choosing three sections along the height direction of the specimen. Results show that creep deformation curves of numerical test of heterogeneous model was close to laboratory test, and the variety of creep deformation curves of numerical experiment for different sections along the height direction of the specimen is almost consistent . Moreover, heterogeneous model displays the distribution of complicated stress of every component in the specimen. Therefore, heterogeneous model can simulate the laboratory creep test more accurately, and every test section of it can be chosen arbitrarily to be the optimum test section.

导出引用

王聪, 郭乃胜, 赵颖华, 谭忆秋. 基于CT技术和有限元方法的沥青混合料数值蠕变试验研究[J]. 大连海事大学学报. 2014, 40(1): 123-127

WANG Cong, GUO Nai-sheng, ZHAO Ying-hua, TAN Yi-qiu. Numerical creep test of asphalt mixture based on X-ray computed topography and finite element method[J]. Journal of Dalian Maritime University. 2014, 40(1): 123-127

参考文献

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基金

“十一五”国家科技支撑计划资助项目(2008BAG10B02)；教育部博士点专项基金资助项目(20092125120005)；中央高校基本科研业务费专项资金项目(2011QN136；3132013315) ；国家自然科学基金资助项目（51308084）；中央高校基本科研项目（3132014223）.