摘要
应用线弹性断裂力学理论结合考虑交通与温度荷载的有限元方法研究沥青路面表面裂纹扩展路径。采用1/4等参奇异性单元模拟裂纹尖端的应力奇异性,运用窗口移动技术模拟裂纹扩展路径,并开发了沥青路面裂纹扩展模拟程序。计算了三种不同长度的路面表面裂纹分别在5种荷载工况作用下的应力强度因子及裂纹起裂角,并模拟了表面裂纹向下扩展的情况。模拟表明,该方法能较好地模拟裂纹扩展路径,有助于更好地了解沥青路面的开裂行为。
In order to study asphalt pavement crack propagation paths,the linear elastic fracture mechanics (LEFM) theory and finite element method (FEM) that incorporate traffic load and temperature stress are used in this paper.Using quarter point collapsed singular isoparametric element,the stress singularity at the vicinity of crack tip is simulated.The crack propagation paths are simulated by using window moving technique.Based on these,an asphalt pavement crack propagation paths simulation (APCPPS^(2D)) program is developed.Under the five various load cases,the stress intensity factors and initiation angle of three various length of surface crack are calculated using APCPPS^(2D) and surface crack propagation paths are simulated.The simulation results indicate that this method can simulate crack propagation paths and help to understand crack behavior of asphalt
出处
《公路交通科技》
CAS
CSCD
北大核心
2005年第3期35-38,共4页
Journal of Highway and Transportation Research and Development
基金
教育部高等学校博士学科点专项科研基金(20020613007)
关键词
沥青路面
表面裂纹
裂纹扩展路径
应力强度因子
温度应力
Asphalt pavement
Surface crack
Crack propagation paths
Stress intensity factor
Temperature stress
