变幅荷载作用下沥青混合料的疲劳损伤试验

发布时间：2018-05-22 08:08

本文选题：道路工程 + 沥青　；参考：《材料科学与工程学报》2017年02期

【摘要】：为了深入研究沥青混合料的疲劳性能,解决现有疲劳性能研究中没有考虑实际路面所受荷载是变幅、重复的加卸载过程这一关键问题,本文通过加载顺序和加载幅值对沥青混合料粘弹性指标的影响进行试验研究,分析了变幅荷载作用下沥青混合料劲度模量、相位角的变化,并选取耗散能作为损伤变量分析了变幅荷载下沥青混合料的疲劳损伤。试验结果表明:劲度模量与应变加载顺序有关;在低高加载顺序中,相位角在两阶段都表现为随着荷载作用次数的增加而增大,在高低加载顺序中,相位角的变化与高低应变的幅值相关;应变在高低顺序加载下累积耗散能要高于低高顺序下的累积耗散能;当采用的前后加载幅值较大时,这种现象更加明显。
[Abstract]:In order to deeply study the fatigue performance of asphalt mixture and solve the key problem of repeated loading and unloading process, the existing fatigue performance research does not consider that the actual pavement load is amplitude change. In this paper, the influence of loading sequence and loading amplitude on the viscoelastic index of asphalt mixture is studied, and the change of stiffness modulus and phase angle of asphalt mixture under variable amplitude load is analyzed. The fatigue damage of asphalt mixture under variable amplitude load is analyzed by selecting dissipative energy as damage variable. The experimental results show that the stiffness modulus is related to the strain loading sequence, and in the low and high loading sequence, the phase angle increases with the increase of the number of loads at both stages, and in the high and low loading sequence, The change of phase angle is related to the amplitude of high and low strain, the cumulative dissipation energy of strain under high and low order loading is higher than that of low high order, and this phenomenon is more obvious when the amplitude of loading before and after loading is larger.
【作者单位】：长安大学材料科学与工程学院;中交第一公路勘察设计院有限公司;
【基金】：青海省科技资助项目(2014-GX-A2A) 中央高校基本科研业务费专项资金资助项目(310831151080,310831153409,310831153315) 中国博士后科学基金资助项目(2015M582592)
【分类号】：U414

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