基于石墨烯应变传感技术的工程结构裂缝监测技术研究

Research on crack monitoring technology in engineering structures based on technology of graphene-based strain sensor

基于大量程石墨烯基应变传感元件,分析工程结构从连续应变到裂缝出现及扩展过程中监测元件的工作特征及输出信号的变化规律,解析传感元件输出信号的函数关系及关键特征参数,分析裂缝监测原理并建立裂缝宽度监测模型,通过设计试验对模型进行验证。研究结果表明:石墨烯基应变传感技术能够实现对工程结构从微应变到开裂的全过程连续监测,裂缝宽度监测模型所得裂缝宽度与实测结果较吻合,相对误差在10%以内;该模型能为工程结构服役期间的智能养维提供有效监测手段,实现对实际工程结构应变-开裂及裂缝扩展的全过程监测和预警。

Based on the graphene-based strain sensor with large range,the working characteristics of the monitoring sensor and the change rule of the output signal in the process of the engineering structure from continuous strain to crack appearance and expansion were analyzed.The theoretical model of crack width monitoring was established by analyzing the function relationship and key characteristic parameters of the output signal of sensing element.Through the tensile test,the crack width monitoring model was verified.The results show that the graphene-based strain sensor can realize the continuous monitoring of the whole process of engineering structures from micro strain to cracking,and the results of the crack monitoring model are in good agreement with the measurement results,and the relative error is within 10%.The model provides an effective monitoring technical means for intelligent maintenance of engineering structures during service,and it is applicable to the monitoring and early warning of structural crack cracking in the early stage.