Failure mode maps for four-point-bending of hybrid sandwich structures with carbon fiber reinforced plastic face sheets and aluminum foam cores manufactured by a polyurethane spraying process
Failure mode maps for four-point-bending of hybrid sandwich structures with carbon fiber reinforced plastic face sheets and aluminum foam cores manufactured by a polyurethane spraying process
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DOI：
10.1177/1099636217722052
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发表时间：
2019-11
影响因子：
3.9
通讯作者：
P. Rupp;P. Elsner;K. Weidenmann
中科院分区：
文献类型：
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作者：
P. Rupp;P. Elsner;K. Weidenmann
这项工作集中在弯曲载荷作用下的夹芯板的破坏模式图，这是使用聚亚安酯喷涂工艺生产的。该工艺允许自动生产夹层板，省去了面片与芯材的单独粘合步骤。所研究的夹芯板由不同形状的碳纤维增强面板和四种不同的泡沫铝或Nomex蜂窝芯材结构组成。生产完成后，利用X射线CT对芯层泡沫结构内部的气孔、面层内的纤维包层厚度和芯层结构的密度均匀性进行了测量。失效模式图是基于面片和芯材的单独力学性能，通过力学测试确定的。对决定失效模式的临界力进行了部分修正，以适应泡沫芯材结构和具有多孔基质的面板的应用。通过四点弯曲试验对失效模式进行了验证。由于所有夹层试件的测试配置都是使用相同的工艺路线生产的，因此用于创建失效模式图的应用模型可以针对许多参数组合进行验证。除两个非恒定参数外，由失效模式图确定的失效模式与由弯曲试验确定的观察到的失效模式相匹配。
This work focuses on failure mode maps of sandwich panels exposed to bending load, which were produced using a polyurethane spraying process. This process allows for an automated production of sandwich panels omitting a separate bonding step of the face sheets to the core. The investigated sandwich panels consisted of carbon fiber reinforced face sheets in various configurations, and four different core structures of aluminum foam or Nomex honeycomb. After production, measurements of the pores inside the core foam structures, the fiber package thickness inside the face sheets, and the density homogeneity of the core structure were made using X-ray computed tomography. The failure mode maps were based on the individual mechanical properties of the face sheets and the core, determined by mechanical testing. The critical forces determining the failure modes were partially modified to fit the application on foam core structures and face sheets with a porous matrix. The verification of the failure modes was performed with four-point bending tests. Since all tested configurations of sandwich specimens were produced using the same process route, the applied models for the creation of the failure mode maps could be verified for numerous parameter combinations. Except for two parameters with inconstant properties, the failure modes determined by the failure mode maps matched the observed failure modes determined by the bending tests.