Mechanical properties of foamed long glass fiber reinforced polyphenylene sulfide integral sandwich structures manufactured by direct thermoplastic foam injection molding
Mechanical properties of foamed long glass fiber reinforced polyphenylene sulfide integral sandwich structures manufactured by direct thermoplastic foam injection molding
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DOI：
10.1016/j.compstruct.2019.03.056
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发表时间：
2019-07-15
影响因子：
6.3
通讯作者：
Elsner, Peter
中科院分区：
文献类型：
--
作者：
Lohr, Christoph;Beck, Bjoern;Elsner, Peter
为了在汽车或航空航天工业中实现高水平的轻量化设计，有必要对某些复合材料系统进行优化，以考虑其轻量化潜力。对于夹层复合材料，通常由覆盖有两个面层的芯层组成，在非均匀分布载荷下，可以减轻总体部件重量，同时提高特定的力学性能。因此，夹芯确保了载荷的传递，同时面层吸收了弯曲应力下产生的拉伸和压缩载荷。其目的是通过使用例如(纤维)增强面层和泡沫芯材料来提高所述三明治的效率，同时将单位面积的重量降至最低。聚苯硫醚(PPS)是一种重要的高温工程热塑性聚合物。由于其特性，它被用于汽车、航空航天和电子工业。由于聚苯硫醚具有较高的加工温度和加工技术，对其发泡行为的科学研究较少。为了解该材料体系的工艺-结构-性能关系，采用高压泡沫注射成型工艺对纯聚苯硫醚和长玻璃纤维增强聚苯硫醚的发泡行为进行了实验研究。由于从制造的角度来看，减少制造步骤的数量并从工艺一开始就使用原始材料进行操作也是有吸引力的，因此使用了在线复合和泡沫注塑工艺。这使得可以通过“直接热塑性泡沫注塑”一次性制造具有连接的、纤维增强的表面和发泡芯层的整体夹层结构。通过本研究的发现，整洁和纤维增强聚苯硫醚零件的研究人员和制造商能够确定工艺参数边界以及这些参数对夹层结构和力学性能的影响。
To achieve high levels of lightweight design in automotive or aerospace industry, it is necessary to optimize certain composite material systems concerning their lightweight potential. With sandwich composites, which generally consist of a core which is coated with two face-layers, it is possible to reduce the overall part weight while increasing the specific mechanical properties under inhomogeneously distributed loads. Hereby the sandwich core ensures the load transmission while the face layers absorb the tensile and compressive loads occurring at bending stress. The aim is to increase the efficiency of said sandwiches while minimizing the weight per area by using for example (fiber-) reinforced face layers and foamed core materials. Polyphenylene sulfide (PPS) is an important high temperature, engineering thermoplastic polymer. Because of its properties it is used in the automotive, aerospace and electronics industry. As polyphenylene sulfide has a high processing temperature and requires processing know-how, there a few scientific studies on its foaming behavior. To understand the process-structure-property relationship of this material system, an experimental study on the foaming behavior of neat polyphenylene sulfide and long glass fiber reinforced polyphenylene sulfide using the high-pressure foam injection molding process is conducted. As it is also attractive from a manufacturing point of view to reduce the number of manufacturing steps and to operate with the source materials from the beginning of the process an in-line compounding and foam injection molding process is used. This allows the manufacturing of integral sandwich structures with connected, fiber reinforced face and foamed core layers in one shot via "direct thermoplastic foam injection molding". With the findings of this study researchers and manufacturers of neat and fiber reinforced PPS parts are able to identify process parameter boundaries and the influence of these parameters on the sandwich structure and mechanical properties.