NDLI: Effect of Notch-Tip Radius on Dynamic Brittle Fracture of Polycarbonate

Content Provider	Springer Nature Link
Author	Faye, Anshul Parameswaran, Venkitanarayanan Basu, Sumit
Copyright Year	2016
Abstract	Polycarbonate (PC), which is considered to be a ductile amorphous polymer, is prone to brittle fracture in the presence of sharp notches. In the present work, effect of notch-tip radius on brittle fracture of PC is studied under static and under dynamic loading (high loading rates) conditions. Towards this end, a hybrid experimental and numerical approach is adopted. Dynamic fracture experiments using Hopkinson bar setup are performed on single-edge notched specimen of PC having different notch-tip radii. Ultra-high speed imaging is used for real-time observation of the fracture process. Finite element simulations are simultaneously performed using a well calibrated elastic-viscoplastic constitutive model for polymers. In the presence of a notch, brittle fracture in PC starts with a defect nucleation ahead of it. For each notch-tip radii, we are experimentally able to capture the process of defect initiation and quantify the mean stress required, static as well as dynamic loading. We found that the mean stress required for defect nucleation increases with decreasing notch-tip radius due to increased triaxility at the notch-tip. Defect initiation stresses are also higher for dynamic conditions compared to static loading. Defect initiation toughness for dynamic loading is always higher than those for static loading, but reduction in defect initiation toughness with decreasing notch-tip is severe for dynamic loading.
Starting Page	1051
Ending Page	1061
Page Count	11
File Format	PDF
ISSN	00144851
Journal	Experimental Mechanics
Volume Number	56
Issue Number	6
e-ISSN	17412765
Language	English
Publisher	Springer US
Publisher Date	2016-03-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polycarbonate Notch-tip radius High-speed imaging Hopkinson bar Dynamic Fracture Continuum Mechanics and Mechanics of Materials Characterization and Evaluation of Materials Optics, Optoelectronics, Plasmonics and Optical Devices Structural Mechanics Vibration, Dynamical Systems, Control Mechanics
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Mechanical Engineering Aerospace Engineering

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