沥青路面内桥式压电换能器性能分析

Analysisof Performance of Bridge Piezoelectric Transducers within Asphalt Pavement

对埋置于沥青路面内部的桥式压电换能器的电压、应力等性能进行分析。通过室内试验和有限元分析相结合的方法,获得了圆弧形及矩形桥式压电换能器在荷载作用下产生的电压值与破坏规律,以及两种压电换能器应力集中处水平最大拉应力及最大剪应力的变化趋势。结果表明,圆弧形及矩形桥式压电换能器所产生的电压值基本与外加应力呈线性关系,且与加载频率无关。当外部荷载的应力水平达到0.5MPa时,圆弧形换能器的压电陶瓷在应力集中处发生断裂,而矩形压电换能器可承受0.7MPa以上的应力作用。为使压电换能器能承受0.7MPa的行车荷载作用,建议压电换能器水平最大拉应力不应超过31.5 MPa,最大剪应力的不应大于14.5MPa。

The performance of voltage and stress of bridge piezoelectric transducers within asphalt pavement were analyzed.Through laboratory tests and finite element methods,generated voltage and failure laws of arc-shaped bridge and side-curved bridge piezoelectric transducers under vehicle loads were obtained,also the trend of maximum horizontal tensile stress and shear stress where stress concentration of the two piezoelectric transducers happens were obtained.The results showed that there existing a linear relationship between generated voltage of arc-shaped bridge and side-curved bridge piezoelectric transducers and applied stress,also it has nothing to do with loading frequency.When applied stress was 0.5MPa,piezoelectric ceramic of arc-shaped bridge transducers was broken in the stress concentration.However,side-curved bridge piezoelectric transducers can sustain stress of 0.7MPa or more.In order to ensure piezoelectric transducers can sustain traffic loads of 0.7MPa,it's recommended that value of maximum horizontal tensile stress should be less than 31.5MPa and maximum shear stress should be less than 14.5MPa.