Browsing by Author "Manurung, Y.H.P."
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Item Numerical Analysis of Single Edge Notched Tension Specimen with Fatigue Crack Parameter of Conventional Specimen Using Linear Elastic Fracture Mechanics(Universiti Tun Hussein Onn Malaysia, 2021) Busari, Y. O.; Abdullah, S.; Manurung, Y.H.P.; Shuaib-Babata, Y. L.This paper describes the numerical analysis of planar crack growth in high strength steel API 5L X70 whose crack growth parameter is adopted from experimental compact tension (CT) specimen in previous literature. Apart from the fact that conventional fatigue crack growth specimen has bogus geometry constraints, the Single Edge Notched Tension (SENT) better replicate the crack-tip constraint conditions experienced in structures. Linear elastic fracture mechanics (LEFM) crack orientation is modelled with the finite element method in SENT model considering its geometry functions a/W ratio to determine its crack growth rate based on constant amplitude load. The virtual crack closure technique tool in MSC Marc/Mentat software with adaptive and global remeshing is applied to assess high cycle fatigue crack propagation using the SENT model. The crack growth pattern for the 3-dimensional simulation characteristics is similar with that of the CT Specimen experimental procedure. Furthermore, the results of the crack propagation and the cycle count demonstrated good agreement with bearable discrepancy with maximum percentage difference of about 14.1 % for the HAZ and 6.4% for the weld and parent metal compared to the experimental results from literature.Item Numerical Evaluation of Fatigue Crack Growth of Structural Steels using Energy Release Rate with VCCT.(MDPI, Basel, Switzerland, 2022-03) Busari, Y. O.; Manurung, Y.H.P.; Leitner, M.; Shuaib‐Babata, Y. L.; Mat, M. F.; Ibrahim, H. K.; Simunek, D.; Sulaiman, M. S.This research presents the numerical evaluation of fatigue crack growth of structural steels S355 and S960 based on Paris’ law parameters (C and m) that are experimentally determined with a single edge notched tension (SENT) specimen using optical and crack gauge measurements on an electromotive resonance machine at constant amplitude load. The sustainable technique is replacing destructive, time‐consuming and expensive approaches in structural integrity. The crack propagation is modelled using the 3D finite element method (FEM) with adaptive remeshing of tetrahedral elements along with the crack initiator elements provided in simulation software for crack propagation based on linear elastic fracture mechanics (LEFM). The stress intensity is computed based on the evaluation of energy release rates according to Irwin’s crack closure integral with applied cyclic load of 62.5 MPa, 100 MPa and 150 MPa and stress ratios of R = 0 and 0.1. In order to achieve optimized mesh size towards load cycle and computational time, mesh and re‐mesh sensitivity analysis is conducted. The results indicate that the virtual crack closure technique VCCT‐based 3D FEM shows acceptable agreement compared to the experimental investigation with the percentage error up to 7.9% for S355 and 12.8% for S960 structural steel.