Influence of edge connection structure on tensile and fatigue properties of transparent parts of aircraft canopy
The materials used for the transparent parts of aircraft canopy are primarily consist of directional polymethylmethac-rylate(PMMA),polycarbonate(PC),or laminated materials of both PMMA and PC.The connection points between the transparent parts and the frame represent the weakest areas in the aircraft canopy structure.These areas are crucial components for ensuring the sealing and integrity of the transparent parts of the canopy,directly affecting the safety of pilots during flight.The tensile strength and fatigue performance of the transparent parts with soft and rigid edge connections in single-layer PMMA and laminated structures of PMMA and PC were evaluated,providing data support for the service life and reliability assessment of different edge structures.The causes and manifestations of fracture and fatigue failure in single-layer PMMA transparent parts and laminated structure trans-parent parts during axial tension and fatigue testing were analyzed,and the possible impact of defects on the tensile and fatigue performances of the canopy transparent parts was proposed.The results show that the tensile fracture stress of the laminated soft connection,single-layer soft connection,laminated rigid connection,and single-layer rigid connection structure samples are 21.5,17.58,16.55,21.55 MPa,and their conditional fatigue limits obtained through the up and down test method are 10.15,10.52,8.01,9.77 MPa,respectively.Considering the lightweight and impact resistance requirements of transparent components in aircraft cano-pies in practical applications,the laminated soft connection structure is selected as the optimal edge connection structure under four conditions.
万方数据
维普
