Sebastian Noller, Roland Heiler and Anja Pfennig
Scientific Tracks Abstracts: J Material Sci Eng
Statement of the Problem: The standard material for cable ducts is polyvinyl chloride (PVC). To prevent PVC
releasing hydrochloric acid (HCl) during heating thermal stabilizers are mixed into the polymer granules. The
stabilizers work sufficiently for moderate temperature rises but fails when PVC burns. Therefore, industry started
using the thermoplastic polymer blend polycarbonate acrylonitrile-butadiene-styrene (PC-ABS) for cable ducts.
PC-ABS is self-extinguishing and reaches the highest level V-0 in the UL94 test for flammability of plastic materials.
Unfortunately, PC-ABS tends to ridge and formats films during stamping. The purpose of this study is to reduce
ridge and film formation during stamping PC-ABS and to identify the dominating failure cause.
Methodology & Theoretical Orientation: First investigations focus on the usage, processing and material properties
of PC-ABS. Test coupons were taken from in-situ cable ducts including further additives generally used in industry.
Vickers hardness (DIN EN ISO 6507), tensile testing (DIN EN ISO 527) and Charpy impact testing (DIN EN ISO
179) as well as microscopic fracture analysis and microstructural analysis was performed.
Findings: Significant differences of PC-ABS tensile properties with and without mineral reinforcement were
observed. The hardness of mineral reinforced PC-ABS is significantly dependent on the geometry of the cable ducts.
The fracture behavior and morphology of the fracture surface is directly related to the coupon temperature during
Charpy impact testing.
Conclusion & Significance: The process temperature influences the failure behavior during high impact processing
such as stamping. Due to the lower fracture toughness of mineral reinforced PC-ABS less film and ridge formation
compared to pure PC-ABS are likely. However, the mineral distribution is not homogeneous and therefore subject to
further investigation. This study aims at a better understanding of process properties of PC-ABS products, parameter
selection, quality improvement and general understanding of underlying microstructural and surface properties.
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2. Machmud M N, Omiya M, Inoue H and Kishimoto K (2018) Impact-induced fracture mechanisms of immiscible PC/ABS (50/50) blends. IOP Conference Series: Materials Science and Engineering 334:012078.
3. Ansari F, Lyons C, Siskey R, Donthu S and MacLean S (2017) Mechanical characterization and fractography of PC, ABS and PMMA Ô?? a comparison of tensile, impact and esc fracture surfaces. SPE ANTEC Anaheim 1220-1227
Sebastian Noller studied mechanical engineering at HS Ulm, Germany while simultaneously graduating with an apprenticeship as an industrial mechanic at a provider for brick production plants. After this he did his master’s degree in mechanical engineering at HTW Berlin, Germany. His thesis he was conducted at a provider for minimum quantity lubrication systems in Berlin. Up to now Sebastian Noller is research fellow at HTW Berlin. Here he uses his earlier experience on manufacturing processes to research on the ridge and film origin in the procedure of stamping PC-ABS during the production of cable ducts.
E-mail: [email protected]