单轴拉伸条件下先进增强结构力学性能研究

目的研究单轴拉伸条件下先进增强结构的力学性能。方法开展先进增强结构以0.02 mm/s匀速加载至20 000 N的静力拉伸实验,采用应变检测方法获取先进增强结构复合材料结构和金属基体结构的应力应变分布特点,研究先进增强结构对金属基体应力水平的降低程度。结果在确保先进增强结构完好的情况下,先进增强结构能大幅度降低金属基体结构的应力水平,降低程度约为85%。结论按照飞机高应力区结构特点和载荷分布特点,合理布置先进增强结构,能增加局部区域的传递路径,减小局部区域的应力水平,提高该区域的疲劳和损伤容限性能。

Mechanical Properties of Advanced Reinforced Structures under Uniaxial Tension

The work aims to study mechanical properties of advanced reinforced structures under uniaxial tension. A static tensile test was conducted on an advanced reinforcement structure loaded at a constant speed of 0.02 mm/s to 20 000 N. The strain detection method was applied to obtain the stress and strain distribution characteristics of advanced reinforced composite structure and metal matrix and investigate the extent to which advanced reinforcement structures reduce the stress level of metal substrates. Research showed that the advanced reinforcement structure can greatly reduce the stress level of the metal matrix structure, and the reduction degree was about 85% when the advanced reinforcement structure was intact. According to the structural characteristics and load distribution characteristics of the aircraft high stress zone, the rational arrangement of advanced reinforcement structures can increase the transmission path in the local area, reduce the stress level in the local area and improve the fatigue and damage tolerance performance of the area.