光纤光栅传感器与沥青混合料协同变形分析

Analysis of coordination between asphalt mixture and fiber Bragg grating sensor

为研究光纤光栅传感器与基体沥青混合料间的协调变形性,采用大型有限元软件ABAQUS建立两者协调变形评价的四点弯曲加载沥青混凝土梁试件模型,分析有无传感器存在对模拟结果的影响以及不同模量的封装材料和沥青混合料组合下传感器所在区域的应变分布规律.结果表明,相同条件下高模量传感器的存在改变了梁体应力场及应变场的分布,使水平拉应力集中在传感器附近,降低了梁底拉应变和梁体应变场的整体变化幅度;传感器模量大小的变化对局部区域影响不大,但对梁整体应变分布影响较大,传感器模量的增大致使梁底水平拉应变和梁体应变场的整体变化幅度均逐渐降低,但其降低的速率在逐渐减小而趋于稳定.

To research the coordination between asphalt mixture and fiber Bragg grating sensor （FBG）, we used the large-scale finite element software ABAQUS to establish a coordination distortion appraisal model, which was the four-point-bend beam specimen, and analyzed the influence on simulation results with or without a FBG as well as the strain distribution around the sensor at different seal material modules. The result indicates that, under the same condition, the existence of high module sensor changes the distribution of stress and strain field, which causes the concentration of horizontal tensile stress around the sensor and reduces the tensile strain at the beam bottom and the changing range of the stress field. The influence on the local region is little, but it is great on the strain distribution of the whole beam ; with the increase of the module, the tensile strain at the beam bottom and the changing range of the stress field are decreased gradually, while the decreasing rate falls gradually and tends to be stable.