@article{ObermeierKarlingerSchemmeetal.2022, author = {Obermeier, Frederik and Karlinger, Peter and Schemme, Michael and Altst{\"a}dt, Volker}, title = {Thermoplastic Hybrid Composites with Wood Fibers: Bond Strength of Back-Injected Structures}, series = {Materials}, volume = {15}, journal = {Materials}, number = {7}, pages = {2473}, year = {2022}, abstract = {Due to their lightweight potential and good eco-balance, thermoplastic hybrid composites with natural fiber reinforcement have long been used in the automotive industry. A good alternative to natural fibers is wood fibers, which have similar properties but are also a single-material solution using domestic raw materials. However, there has been hardly any research into wood fibers in thermoplastic back-injected hybrid composites. This article compares the bond strength of an injection molded rib from polypropylene (PP) and wood fibers to different non-wovens. The non-wovens consisted of wood fibers (spruce) or alternatively natural fibers (kenaf, hemp), both with a polypropylene matrix. Pull-off and instrumented puncture impact tests show that, given similar parameters, the natural and wood-fiber-hybrid composites exhibit very similar trends in bond strength. Further tests using viscosity measurements, microscopy, and computed tomography confirm the results. Wood-fiber-reinforced thermoplastic hybrid composites can thus compete with the natural fiber composites in terms of their mechanical behavior and therefore present a good alternative in technical semi-structural applications.}, language = {en} }