Procedia Materials Science 3 (2014) 764 – 771 Available online at www.sciencedirect.com 2211-8128 © 2014 Published by Elsevier Ltd. Open access under CC BY-NC-ND license. Selection and peer-review under responsibility of the Norwegian University of Science and Technology (NTNU), Department of Structural Engineering doi:10.1016/j.mspro.2014.06.125 ScienceDirect 20th European Conference on Fracture (ECF20) Investigation of crack tip stress and strain fields at crack initiation of A106 Gr. B carbon steels under high strain rates Hyun-Suk Nam a , Jin-Ho Je a , Jae-Jun Han a , Yun-Jae Kim a * a Department of Mechanical Engineering, Korea University, 1-5ka, Anam-dong, Sungbuk-ku, Seoul 136-713, Repiblic of korea Abstract This paper analyzes crack tip stress and strain fields at crack initiation under high strain rates. In the range of high strain rates, the mechanical behavior of a material is characterized by an increased in strain rate sensitivity. However, due to geometry and constraint of various test specimen, it is difficult to quantify strain rate on the at constant test speed. To quantify the strain rate, we simulate crack tip stress and strain fields using three-dimensional finite element model. Our analysis models are fracture toughness (CT) specimen and full scale circumferential cracked pipe component. Dynamic material properties used in the finite element analysis are based on Pipe Fracture Encyclopedia. Pipe Fracture Encyclopedia provides strain rate dependent tensile test, fracture toughness test and full-scale four point bending test. All experiments were tested at 288°C and test specimens were extracted from A106 Gr, B carbon steel pipes. Three different strain rate tensile test (4 x 10 -4 /s, 3.4/s and 11.6/s) are fitted using Johnson-Cook model. Our results show that, applied strain rate and strain rate at characteristic length have similar values as in the CT specimen simulation result. Similar outcomes were shown in the pipe simulation result. Keywords: high strain rate,dynamic loading, crack tip plasticity, dynamic fracture * Corresponding author. Tel.: +82-3290-3372; fax: +82-929-1718. E-mail address: [email protected] © 2014 Published by Elsevier Ltd. Open access under CC BY-NC-ND license. Selection and peer-review under responsibility of the Norwegian University of Science and Technology (NTNU), Department of Structural Engineering brought to you by CORE View metadata, citation and similar papers at core.ac.uk provided by Elsevier - Publisher Connector
Investigation of crack tip stress and strain fields at crack initiation of A106 Gr. B carbon steels under high strain rates
May 21, 2023
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