低温下沥青中柔性短纤维桥联应力计算模型  

Computation model of bridging stress for flexible short fiber in asphalt at low temperature

作　　者：丁智勇[1] 彭波[2] 王振军[3] 

机构地区：[1]长安大学道路施工技术与装备教育部重点实验室,陕西西安710064 [2]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [3]长安大学材料科学与工程学院,陕西西安710064

出　　处：《交通运输工程学报》2011年第5期6-11,34,共7页Journal of Traffic and Transportation Engineering

基　　金：国家自然科学基金项目(50908021);中央高校基本科研业务费专项资金项目(CHD2011JC042)

摘　　要：分析了柔性纤维增强脆性材料特点,建立了单根纤维从沥青中拔出时的受力模型。采用球面坐标系建立空间均匀分布短纤维桥联应力的计算模型,计算了沥青断裂时短纤维产生的桥联应力。采用大尺寸的纤维沥青试件进行低温拉伸断裂试验,实测短纤维的桥联应力。通过对桥联应力的计算值和实测值进行试算拟合,修正了计算模型中的参数。分析结果表明:桥联应力的实测值和模型计算值的拟合误差最大值为6.67%,拟合效果比较理想。可见,采用力学-经验方法可以研究低温下柔性短纤维桥联应力。The characteristics of flexible-fiber-reinforced brittle materials were analyzed,and a mechanical model of single fiber pulled out from asphalt at low temperature was established.In spherical coordinate,a computation model of bridging stress for short fiber was established when short fibers uniformly distributed in asphalt,and the bridging stress was computed when asphalt ruptured.The bridging stress was measured by using tensile test and large size fiber asphalt samples at low temperature.The calculation model was corrected by fitting calculated and measured values of bridging stress.Analysis result shows that the maximal fitting error is 6.67%,so,the mechanics-experience method can be used to study the bridging stress of flexible short fiber at low temperature.1 tab,12 figs,12 refs.

关 键 词：路面材料 柔性短纤维 低温 沥青 桥联应力 计算模型 拉伸断裂试验 

分 类 号：U416.217[交通运输工程—道路与铁道工程]