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Core compression in sandwich beams under contact loading

机译：接触载荷下夹芯梁的芯压缩

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Failure of the core in sandwich structures under concentrated loading is of potential concern, and it is difficult to compute the core compressive stress by simple means. Contact loading adds additional complexity, as surface displacements are imposed and the contact zone size and pressure distribution is initially unknown. However contact loading is important as it is widely used in three or four point bend tests to determine failure properties, and is also typically involved in impact loading. The calculation of core compressive stress was addressed in the present work by utilizing an elasticity solution due to Pagano and Srinivas and Rao for transverse loading of layered orthotropic materials. Contact pressure distributions were obtained by systematically varying pressures and comparing the computed surface displacements with the indentor profile. The results show that the pressure distribution for an orthotropic half-space is applicable to sandwich beams over a wide range of variables. A beam-on-elastic-foundation model was found to be useful in correlating the analysis results for core compressive stress.
机译：夹心结构在集中载荷作用下的核心破坏是潜在的问题，并且很难通过简单的方法来计算核心的压缩应力。接触载荷增加了额外的复杂性，因为施加了表面位移并且接触区的大小和压力分布最初未知。但是，接触载荷很重要，因为它广泛用于三点或四点弯曲测试中以确定破坏性质，并且通常还涉及冲击载荷。在当前工作中，通过利用由Pagano和Srinivas和Rao引起的弹性解对层状正交各向异性材料的横向载荷进行了计算，从而解决了岩心压应力的计算问题。通过系统地改变压力并将计算出的表面位移与压头轮廓进行比较，可获得接触压力分布。结果表明，正交各向异性半空间的压力分布适用于各种变量的夹层梁。发现弹性基础上的梁模型对于关联岩心压应力的分析结果很有用。

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