基于离散元方法的沥青混合料力链演化及分布量化分析
发布时间：2019-03-21 18:50
【摘要】：为了研究沥青混合料内部颗粒间力链的演化及分布规律,以AC-13沥青混合料作为研究对象,利用离散元方法重构沥青混合料数字试件,模拟简单性能试验,提取试件内部颗粒间的力链信息进行力链演化、概率分布和角度分布分析。结果表明,通过比较预测结果和实测结果,基于离散元方法重构的AC-13沥青混合料细观模型用于模拟其细观力学特性是可行的。试件内部力链空间分布具有各向异性,以垂直方向的压力力链为主,承受大部分的半正弦荷载。法向力链概率分布随加载时间的变化规律基本一致,法向接触力与平均法向接触力比值f最小时,概率分布出现最大值,f=1.75时,概率分布再次达到峰值,然后逐渐减小并趋于稳定。法向力链角度分布主要位于90°和270°附近,第一、二象限的角度分布比例远大于第三、四象限,60~120°、30~150°中法向力链角度分布比例均大于70%,最小为72.733%。
[Abstract]:In order to study the evolution and distribution of the inter-particle force chain in asphalt mixture, AC-13 asphalt mixture is taken as the research object, the digital specimen of asphalt mixture is reconstructed by discrete element method, and the simple performance test is simulated. The force chain evolution, probability distribution and angle distribution were analyzed by extracting the information of force chain between particles. The results show that the meso-model of AC-13 asphalt mixture reconstructed based on discrete element method is feasible to simulate the meso-mechanical properties of asphalt mixture by comparing the prediction results with the measured results. The spatial distribution of the force chain in the specimen is anisotropic, mainly in the vertical direction of the pressure chain, bearing most of the semi-sinusoidal load. The probability distribution of normal force chain is basically consistent with the loading time. The ratio of normal contact force to average normal contact force f is the smallest, and the probability distribution reaches the maximum value. When f is 1.75, the probability distribution reaches its peak again. Then gradually decrease and tend to stabilize. The angle distribution of the normal force chain is mainly in the vicinity of 90 掳and 270 掳. The proportion of angle distribution in the first and second quadrant is much larger than that in the third quadrant, the fourth quadrant, the angle distribution proportion of the normal force chain in the range of 60 掳120 掳and 30 掳150 掳are all more than 70% and the minimum is 72.733%.
【作者单位】： 长安大学材料科学与工程学院;长安大学公路学院;长安大学特殊地区公路工程教育部重点实验室;
【基金】：国家自然科学基金(51408047;51378073;51408043) 中央高校基本科研业务费专项资金(310831161002;310821153502;310821152003)
【分类号】：TB33
本文编号：2445222
[Abstract]:In order to study the evolution and distribution of the inter-particle force chain in asphalt mixture, AC-13 asphalt mixture is taken as the research object, the digital specimen of asphalt mixture is reconstructed by discrete element method, and the simple performance test is simulated. The force chain evolution, probability distribution and angle distribution were analyzed by extracting the information of force chain between particles. The results show that the meso-model of AC-13 asphalt mixture reconstructed based on discrete element method is feasible to simulate the meso-mechanical properties of asphalt mixture by comparing the prediction results with the measured results. The spatial distribution of the force chain in the specimen is anisotropic, mainly in the vertical direction of the pressure chain, bearing most of the semi-sinusoidal load. The probability distribution of normal force chain is basically consistent with the loading time. The ratio of normal contact force to average normal contact force f is the smallest, and the probability distribution reaches the maximum value. When f is 1.75, the probability distribution reaches its peak again. Then gradually decrease and tend to stabilize. The angle distribution of the normal force chain is mainly in the vicinity of 90 掳and 270 掳. The proportion of angle distribution in the first and second quadrant is much larger than that in the third quadrant, the fourth quadrant, the angle distribution proportion of the normal force chain in the range of 60 掳120 掳and 30 掳150 掳are all more than 70% and the minimum is 72.733%.
【作者单位】： 长安大学材料科学与工程学院;长安大学公路学院;长安大学特殊地区公路工程教育部重点实验室;
【基金】：国家自然科学基金(51408047;51378073;51408043) 中央高校基本科研业务费专项资金(310831161002;310821153502;310821152003)
【分类号】：TB33
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1 Wei—MingShen;Ching—FengChang;魏太昭;;挤压工艺的模拟试验[J];炭素技术;1991年02期
2 龚平,唐志平,沈兆武;冲击下材料质量混合的实验研究及离散元模拟[J];高压物理学报;2004年01期
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