Impact-induced fracture mechanisms of immiscible PC/ABS (50/50) blends

3rd International Conference on Chemical Engineering Sciences and Applications 2017

Machmud, M.N.^1 ; Omiya, M.^2 ; Inoue, H.^3 ; Kishimoto, K.^4

Division of Alternative Materials for Components and Structures, Department of Mechanical Engineering, Syiah Kuala University, Darussalam, Banda Aceh

23123, Indonesia^1

Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Kanagawa, Yokohama

223-8522, Japan^2

Department of Mechanical and Control Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo

152-8552, Japan^3

Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo

152-8552, Japan^4

关键词: Drop weight impact;    Fracture mechanisms;    Fracture surfaces;    Interface delamination;    Secondary cracking;    Secondary cracks;    Stress whitening;    Transverse shear stress;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/334/1/012078/pdf
DOI  :  10.1088/1757-899X/334/1/012078

来源: IOP

【 摘 要 】

This paper presents a study on fracture mechanisms of polycarbonate (PC)/acrylonitrile-butadiene-styrene (ABS) (50/50) blends with different ABS types under a drop weight impact test (DWIT) using a circular sheet specimen. Formation of secondary crack indicated by a stress-whitening layer on the mid-plane of scattered specimens and secondary surface of fracture perpendicular to primary fracture surface were captured under scanning electron microscope (SEM). Although the both blends finally failed in brittle modes, SEM observation showed that their secondary fracture mechanisms were completely different. Observation through the thickness of the etched PC/ABS specimen samples using SEM also clearly showed that PC and ABS were immiscible. The immiscibility between PC and ABS was indicated by presence of their layer structures through the thickness of the blends. It was revealed that layer of ABS structure was influenced by size of rubber particle and this latter parameter then affected microstructure and fracture mechanisms of the blends. Impact-induced fracture mechanisms of the blends due to such microstructures are discussed in this paper. It was also pointed out that the secondary cracking was likely caused by interface delamination between PC and ABS layers in the core due to transverse shear stress generated during the impact test.