关键词: 复合材料结构, 大跨距, 弯曲载荷, 载荷定位, 载荷监测

Abstract:  Because of the load monitoring requirements and real-time monitoring problems faced by composite components during service, fiber Bragg grating (FBG) sensors were pasted on the surface of carbon fiber composite materials to measure the strain of carbon fiber composite materials. The bending load size and loading position of carbon fiber composite materials were monitored by establishing theoretical models of strain, load size, and loading position. The method and technical support were provided for overload warning of composite materials in service. The composite components under the bending load, the finite element analysis strain were compared with the theoretically calculated strain to verify the validity of the finite element analysis model, and then the errors between the strain values monitored by the FBG sensor and the theoretically calculated was compared. Finally, the size and position of the bending load subjected to the composite materials were calculated based on the FBG monitoring strain. The results show that under the central load, the maximum error of strain measured by FBG and theoretical calculation value is not more than 16.22%, the maximum error of load size is not more than 10.37%, and the maximum error of load position is not more than 2.83%. Under the action of eccentric 20 mm load, the maximum error of FBG monitoring strain and theoretical calculation value is not more than 10.69%, the maximum error of load size is not more than 13.89%, and the maximum error of load position is not more than 5.70%.

Key words: composite structure, long-span, bending load, load positioning, load monitoring