玻璃/环氧圆柱管能量吸收细观机理

研究了玻璃纤维增强环氧圆柱管轴向撞击和准静态压缩下的能量吸收特性。总结了稳态压缩的三种宏观破坏模式,即层束弯曲、局部屈曲和横向剪切。从细观角度出发,详细研究了不同宏观破坏模式的复合材料圆柱管的能量耗散机理,并比较了吸能能力。随着铺设角度增大,能量吸收机理由基体控制向纤维与基体共同控制转化,因此能量吸收逐渐增大。本文还比较了撞击和准静态下能量吸收的特点。

MICROSCOPIC MECHANISM OF ENERGY ABSORPTION BEHAVIOR FOR GLASS/EPOXY TUBES UNDER IMPACT LOADING

Axial crushing energy dissipation behavior of glass/epoxy round tubes is investigated both dynamically and quasi-statically. Three macroscopic collapse modes are observed and summarized during the stable crushing process: they are lamina bending, local buckling and transverse shearing. From the view-point of microscopic mechanism, energy dissipation mechanisms are studied for different macro collapse modes, and their energy absorption capabilities are compared in details. As the winding angle increased, energy absorption efficiency of the composite tube is improved, because the controlling energy dissipation mechanism is changing from matrix fracture to fiber/matrix fracture. Energy absorption characteristics are also compared between the impact test and quasi-static test; for tubes of 5 and 5, energy absorption capability in the impact test is higher than that in quasi-static loading, whereas for tubes with the plying angle greater than 45°, the situation is opposite.