【摘要】 用0°纤维铺设的单向复合材料梁弯曲时易发生剪切破坏。本文提出了一种能承受较大弯曲负荷的复合材料箱形梁。其腹板用±45°纡维缠绕,上、下翼板用0°层纤维增强。並在棱条处局部加强。这样,可充分发挥复合材料抗拉、抗压强度高的优点,又不易发生剪切破坏。对±45°缠绕梁进行了实测应力分析,並按文中提出的确定棱条处应力的计算模式进行了数值计算分析。该箱形梁可望用作载重汽车的板簧悬挂系统。更多还原

【Abstract】 Shear failure often occurs on a unidirectional composite beam with 0°(with respect to beam axis) fiber-plys during bending. This paper presents a composite boxbeam with new ply design such that the boxbeam can carry larger loads than the unidirectional composite beam. The ply design is that: on the web ±45°fibers are winded, on the flange of the boxbeam (on the top and on the bottom) again reinforced by 0°fiber-plys and at ribs is reinforced also. Thus, high tensile and compressive strengths are adequately brought into play and shear failure may be reduced to the least. To compute the stresses in the ribs, this paper presents a numerical model for the computation.The boxbcam thus designed can be used in the plates-pring suspension system of a car.更多还原