On an application of multi-material composite laminates in the aerospace sector
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On an application of multi-material composite laminates in the aerospace sector Hans Luinge 1 & Laurent L. Warnet 2 Received: 19 January 2020 / Revised: 29 May 2020 / Accepted: 20 June 2020 # The Author(s) 2020
Abstract This paper explores the possibility to use shredded thermoplastic laminates as one of the plies within a laminate. The focus lies in potential performance decrease due to the presence of such compounds within the laminate. For this purpose, a typical application of a stampformed thermoplastic-based laminate is taken as a basis. In this application, the replacement of mid-plane layers by a moulding compound is considered. The performance knockdown is evaluated using a series of tests typically related to the application. The results of bending, bearing and curved beam tests are reported and analysed. The results show that the replacement of continuous fibres by shredded laminates does not affect significantly the performance of the material for the chosen properties. The applicability of such hybrid laminates is further discussed based on these results. Keywords Thermoplastic composites . Hybrid laminates . Recycling
1 Introduction Thermoplastic-based composite materials meant for (semi) structural applications can be categorised according to their fibre length, fibre content and processability. Continuous fibre-reinforced systems are often pressed or stampformed into shell-like products having a relatively low degree of complexity, which are subsequently assembled into more complex structures [1]. Discontinuous long fibre-reinforced systems can be processed with compression moulding, leading to products potentially having a higher degree of complexity though showing generally lower mechanical performance than the continuous fibre-reinforced materials. An interesting recent application of compression moulding is the reprocessing of recycled shredded thermoplastic composites, as illustrated for example by Abdul Rasheed [2] and Vincent [3], where ground (production) laminate scrap is
* Laurent L. Warnet [email protected] Hans Luinge [email protected] 1
Toray Advanced Composites, G. van der Muelenweg 2, Nijverdal, the Netherlands
2
University of Twente, Drienerlolaan 5, Enschede, the Netherlands
used. Here again, the mechanical properties of such products remain way lower to those of their original counterparts. The study presented in this paper proposes to evaluate the use of thermoplastic composite production cut-outs in the form of shredded moulding compound in combination with continuous fibre-reinforced thermoplastic laminates. The main goal is to demonstrate the potential of using thermoplastic composite scrap in a (semi) structural application, by choosing the recycled material as one of the plies within a traditional laminate. The key element in order to prevent the performance knock-down of the moulding compound will be to prevent having the recycled material along the main loading path. When successful, the use of recycled materials in traditional lamin
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