Experimental investigation of acrylonitrile butadiene styrene fracture

Society of Plastics Engineers (SPE), Plastics Research Online, 10.2417/spepro.005184
Experimental investigation of acrylonitrile butadiene styrene fracture
Abuzar Es’hagi Oskui, and Naghdali Choupani
Institute of Polymeric Materials, Sahand University of Technology, Tabriz, Iran
Elyas Haddadi
Technical and Vocational University, Tabriz, Iran
Abstract
A new loading device was developed to determine the mixed-mode critical stress intensity factors of acrylonitrile butadiene styrene.
Although stress-based approaches have been the subject of a vast amount of research, fracture mechanics is also a proven tool for failure analysis. Because of the complex failure modes and mechanics present in polymeric materials (and the involvement of many geometric, material, and fabrication variables), a deeper understanding of polymers’ fracture behavior is needed in order to fully gain their benefits.
A number of test methods have been proposed to determine fracture toughness. The double cantilever beam test is the most widely used method for measuring mode-I (opening) fracture toughness. The endnotched flexure has emerged as one of the most convenient mode-II (shear) type fracture tests. Various attempts have been made to characterize fracture toughness under mixed-mode loading conditions, where mostly beam-type specimens were used. The mixed-mode bending test specimens combine the schemes used for double cantilever beam and end-notched flexure tests to study the mixed-mode fracture. However, for these test methods it is difficult to create a wide range of mixedmode ratios, and this limits their usefulness. Also, different beam-type specimens would be required in order to obtain reliable results for fracture toughness in pure mode-I, pure mode-II, and mixed-mode loading. It is therefore necessary to develop other test methods to evaluate the mixed-mode fracture toughness under all in-plane loading.1
In this study, researchers made a new loading device for the mixed-mode fracture test of specimens, which allows mode-I, mode-II, and almost any combination of mode-I and mode-II loading to be tested with the same test specimen configuration.
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