CAJ | 학술논문

针对混凝土内部动态应力直接测量需求，设计制作了软基底的PVDF压力传感器，传感器为夹心式结构，PVDF压电薄膜厚度为50μm，传感器的有效工作区域为1 cm×1 cm的矩形。对传感器防护后将其直接埋入混凝土内部进行动态应力测量，获得了冲击压缩实验中混凝土内部动态应力的有效数据，实现了混凝土内部动态应力的直接测量。与应变片测得的应力信号相比，PVDF压力传感器测得的铝合金试件中应力峰值偏差为10.7％，混凝土中应力峰值偏差为19.3％。
침대혼응토내부동태응력직접측량수구，설계제작료연기저적PVDF압력전감기，전감기위협심식결구，PVDF압전박막후도위50μm，전감기적유효공작구역위1 cm×1 cm적구형。대전감기방호후장기직접매입혼응토내부진행동태응력측량，획득료충격압축실험중혼응토내부동태응력적유효수거，실현료혼응토내부동태응력적직접측량。여응변편측득적응력신호상비，PVDF압력전감기측득적려합금시건중응력봉치편차위10.7％，혼응토중응력봉치편차위19.3％。
To measure the internal-stress of concrete directly ,a kind of PVDF stress sensor of soft underlayer was designed . The PVDF film was conglutinated between two pieces of insulating film .The thickness of the PVDF film was 50 microns,and the ef-fective work area of the sensor was 1 centimeter by 1 centimeter .The sensor was encapsulated and then fixed inside the concrete specimen .The experiments were carried out ,and the internal-stress history of concrete was obtained .Compare with data obtained by strain gauge,the peak value of internal-stress of aluminium alloy and concrete obtained by PVDF stress sensor are 10.7%and 19.3%lower separately .