Engineering Transactions, 62, 4, pp. 329–354, 2014

Description of the Yield State of Bioplastics on Examples of Starch-Based Plastics and PLA/PBAT Blends

Teresa FRAS
French-German Research Institute of Saint-Louis (ISL)

Masahiro NISHIDA
Nagoya Institute of Technology, Department of Mechanical Engineering Gokiso-cho, Showa-ku, Nagoya, Aichi, 466-8555, Japan

Laboratory of Mechanics, Biomechanics, Polymers and Structures (LaBPS), National Engineering School of Metz (ENIM), Route d’Ars Laquenexy, 57000 Metz, France

Ryszard Bolesław PĘCHERSKI
Institute of Fundamental Technological Research of the Polish Academy of Sciences, A. Pawińskiego 5B, 02-106 Warsaw, Poland

Aichi Center for Industry and Science Technology, 1267-1 Akiai, Yakusa-cho, Toyota-shi, Aichi, 470-0356, Japan

The present work concerns the description of the yield state of biodegradable materials. As examples, biodegradable polymers are chosen – cornpole CRP-M2, starch fatty acid ester, and PLA/PBAT, poly(lactic acid) (PLA) blended with poly(butylene adipate/terephthalate) (PBAT), [1-2]. These biodegradable, plant-derived bioplastics are a promising alternative to petroleum-based plastics. To describe the onset of plasticity in the bioplastics under discussion, Burzyński ´s hypothesis of material effort has been applied, [3-4]. The applied criteria account for the differential strength effect and for the shear correction resulting from the difference between experimental and theoretical values obtained as a result of the Huber-Mises approach, [5-6]. In general, these properties of yield state are characteristic for polymers. The description of yield state for bioplastics is an issue that has hardly been investigated, where illustrates the novel nature of this paper in which this topic is discussed.
Keywords: bioplastics, strength differential effect, shear correction, yield surface, Burzyński yield condition.
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