简支梁式关键部件在蜂窝纸板缓冲作用下的冲击响应研究

具有简支梁式关键部件的电子产品,在运输过程中常用蜂窝纸板作为缓冲材料。为了分析这类易损部件在冲击载荷下的失效行为,先研究蜂窝纸板的压缩力学性能,并得到蜂窝纸板简化本构方程;然后在矩形加速度脉冲激励下,求解出最大应力与矩形脉冲峰值之间的关系,进而得到蜂窝纸板横截面积与厚度所满足的约束条件,推导出简支板弯曲应力的近似解析解;最后通过有限元分析验证解析法的可靠性。研究结果表明:蜂窝纸板在屈服阶段的应力可以表示为平台应力,且蜂窝纸板呈现率相关性;运用矩形加速度脉冲替代蜂窝纸板实际传递的加速度脉冲,在求解易损件的应力响应中具有较高的精度。

Study on Shock Response of Critical Component of Simply Supported Beam Under Cushion Action of Honeycomb Paperboard

Honeycomb paperboard is usually adopted as the cushioning material in the transportation process for electronic products with the critical components of simply supported beam. In order to analyze the failure behavior of this sort of fragile part under impact load, the compression mechanical properties of honeycomb paperboard were studied firstly, with the simplified constitutive equation of honeycomb paperboard obtained. Then the relation between the maximum stress and the peak value of rectangular pulse was solved under the excitation of rectangular acceleration pulse, the constraint conditions satisfying cross-sectional area and thickness of honeycomb paperboard were obtained, and the approximate analytical solution of bending stress of simply supported beam was derived. Finally, the reliability of the analytical method was verified by finite element analysis. The results showed that the stress of honeycomb paperboard in yield stage could be expressed as platform stress, and rate dependency was notable for honeycomb paperboard. The rectangular acceleration pulse was used to replace the actual acceleration pulse transmitted by honeycomb paperboard, and had a high accuracy in solving the stress response of the critical components.