排水沥青混合料疲劳损伤耗散能变化比

发布时间：2018-01-07 08:25

本文关键词：排水沥青混合料疲劳损伤耗散能变化比　出处：《长安大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：为了给排水沥青路面的长期性能评价提供一定的研究基础,开展了高黏排水沥青混合料疲劳性能研究。在不同应变水平下对2种不同集料类型的高黏改性排水沥青混合料进行了四点弯曲小梁疲劳试验,采用劲度模量衰减以及能量法针对材料疲劳损伤过程进行分析;采用每一加载循环内材料耗散能变化比曲线跃变点进行材料疲劳损伤失效判定,并建立了包含耗散能变化比稳定值、材料组成体积参数等多因素在内的材料疲劳寿命预估模型。研究结果表明:应变控制模式下达到疲劳破坏标准时,高黏改性排水沥青混合料的劲度模量衰减仍处于平稳发展阶段,以此作为该材料疲劳失效判据并不恰当;传统累积耗散能与疲劳寿命存在良好的相关性,但低应变水平下稍有离散,且无法反映损伤过程的能量变化情况;而耗散能变化比曲线能够较为清晰地反映出材料在疲劳重复加载中的三阶段损伤过程,耗散能变化比稳定阶段表明整个损伤过程能量转化中材料自身损伤所需能量存在一固定比例,耗散能变化比稳定值表征了材料稳定的抵抗疲劳损伤的能力,并与材料疲劳寿命具有良好的幂函数关系,所建立的疲劳寿命预估模型能反映出材料疲劳损伤的本质;材料寿命预估模型拟合结果具有较高的拟合优度。
[Abstract]:To provide a research base for long-term performance evaluation of drainage asphalt pavement, the high viscosity of drainage asphalt mixture fatigue performance study. Under different strain levels of 2 different aggregate type high viscosity modified asphalt mixture of four point bending beam fatigue test, the stiffness modulus decay according to the energy method and the process of material fatigue damage analysis; using each loading cycle within the material energy dissipation curve change than the jump point of material fatigue damage failure criterion, and built a dissipated energy change than the stable value prediction model of multi factor material volume parameter, the fatigue life of the material. The results show that: strain control mode to reach the fatigue criterion, high viscosity modified asphalt mixture stiffness modulus decay is still in the stage of steady development, as the fatigue failure judgment It is not appropriate; the traditional cumulative dissipated energy has good correlation with the fatigue life, but low strain levels slightly discrete, and cannot reflect the changes of energy dissipation and damage process; change is clearly reflected in the material in the three stage of repeated loading fatigue damage ratio curve can change than the stable energy dissipation the stage show that there is a fixed proportion of the whole damage process of energy conversion materials required for energy dissipation damage, can change than the stable value to characterize the ability to resist fatigue damage of materials and stable, and has good power function and the fatigue life of the material, the fatigue life prediction model can reflect the essence of material fatigue damage; the material life prediction model has the advantages of high degree of fitting.

【作者单位】：云南省交通规划设计研究院陆地交通气象灾害防治技术国家工程实验室;重庆交通大学土木工程学院;云南省公路科学技术研究院;
【基金】：云南省科技创新强省国际科技合作专项项目(2009AC009) 云南省交通运输厅科技项目(云交科教2014[231]-(二))
【分类号】：U414
【正文快照】： Variation ratio of dissipated energy of fatigue failure forporous asphalt mixtureLI Xiao1,2,LIANG Nai-xing2,BAI Hong-tao1,CHENG Zhi-hao1,ZHAO Xiao-jie3(1.National Engineering Laboratory for Surface Transportation Weather Impacts Prevention,BroadvisionEng

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