The Experts below are selected from a list of 66312 Experts worldwide ranked by ideXlab platform
H Arikan - One of the best experts on this subject based on the ideXlab platform.
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failure analysis of 55 3 filament wound composite pipes with an inclined Surface Crack under static internal pressure
Composite Structures, 2010Co-Authors: H ArikanAbstract:Abstract This study conducts failure analysis of filament wound glass reinforced plastic (GRP) pipes made of E-glass/epoxy with an inclined Surface Crack under open-ended internal pressure. Test specimens are composed of six antisymmetric layers with (±55°)3 winding angles. Tests have been performed at seven different Crack angles: 0 ° , 15 ° , 30 ° , 60 ° , 45 ° , 75 ° , and 90 ° , with Crack-to-thickness ratio of a / t = 0.50 . The burst strengths of the specimens were determined, and the dependence of the burst strength on the Crack angle was examined.
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the fatigue behavior of 55 3 filament wound grp pipes with a Surface Crack under internal pressure
Composite Structures, 2007Co-Authors: Necmettin Tarakcioglu, Ahmet Samanci, H Arikan, Ahmet AkdemirAbstract:Abstract In this study, the fatigue behavior of (±55°) 3 filament wound composite pipes with a Surface Crack under alternating internal pressure has been investigated. Glass reinforced plastic (GRP) pipes were made of E-glass/epoxy and tested in an open-ended condition. For this study, a PLC controlled hydraulic test stand has been established. Test specimens have antisymmetric six layers which have ±55 ° winding angles. Fatigue tests of the pipes with a Surface Crack which have notch aspect ratio a / c = 0.2 and notch-to-thickness ratios a / t = 0.25, 0.38 and 0.50 in the axial direction have been carried out in accordance with ASTM D-2992. This standard allows a frequency of 25 cycles per minute and an R = 0.05 stress ratio. Tests have been performed at three different maximum stress levels, which were 50%, 40% and 30% of the ultimate hoop stress. Final failure of the GRP pipes has been examined and fatigue test results are presented by means of ( S – N ) curves and delamination damage zone area–cycle ( A – N ) curves.
Shunpeng Zhu - One of the best experts on this subject based on the ideXlab platform.
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probabilistic modeling and simulation of multiple Surface Crack propagation and coalescence
Applied Mathematical Modelling, 2020Co-Authors: Shunpeng Zhu, Yongzhen Hao, Ding LiaoAbstract:Abstract In the low cycle fatigue (LCF) regime, fatigue failure of metallic materials with high strength and less impurities generally dominates by multiple Surface Crack propagation and coalescence, in which its final failure shows a stochastic nature on Crack initiation, propagation and coalescence under cyclic loadings. According to this, the competing failure modes of multiple Surface Cracks and interior Cracks are studied through coupling numerical simulations with fracture mechanics methods. In particular, a probabilistic procedure for modeling multiple Surface Crack propagation and coalescence is established by incorporating Monte Carlo simulation with experimental evidences, including Surface Crack density and Crack length distributions measured from LCF replica tests of 30NiCrMoV12 steel. In addition, it calculates the probability of coalescence of neighboring Cracks with allowance for their interactions and local plastic deformation at the Crack tips. Finally, it estimates the remaining usage lives of specimens from initial state to critical Cracks by propagation and coalescence of dispersed Cracks.
Ahmet Akdemir - One of the best experts on this subject based on the ideXlab platform.
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the fatigue behavior of 55 3 filament wound grp pipes with a Surface Crack under internal pressure
Composite Structures, 2007Co-Authors: Necmettin Tarakcioglu, Ahmet Samanci, H Arikan, Ahmet AkdemirAbstract:Abstract In this study, the fatigue behavior of (±55°) 3 filament wound composite pipes with a Surface Crack under alternating internal pressure has been investigated. Glass reinforced plastic (GRP) pipes were made of E-glass/epoxy and tested in an open-ended condition. For this study, a PLC controlled hydraulic test stand has been established. Test specimens have antisymmetric six layers which have ±55 ° winding angles. Fatigue tests of the pipes with a Surface Crack which have notch aspect ratio a / c = 0.2 and notch-to-thickness ratios a / t = 0.25, 0.38 and 0.50 in the axial direction have been carried out in accordance with ASTM D-2992. This standard allows a frequency of 25 cycles per minute and an R = 0.05 stress ratio. Tests have been performed at three different maximum stress levels, which were 50%, 40% and 30% of the ultimate hoop stress. Final failure of the GRP pipes has been examined and fatigue test results are presented by means of ( S – N ) curves and delamination damage zone area–cycle ( A – N ) curves.
Ding Liao - One of the best experts on this subject based on the ideXlab platform.
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probabilistic modeling and simulation of multiple Surface Crack propagation and coalescence
Applied Mathematical Modelling, 2020Co-Authors: Shunpeng Zhu, Yongzhen Hao, Ding LiaoAbstract:Abstract In the low cycle fatigue (LCF) regime, fatigue failure of metallic materials with high strength and less impurities generally dominates by multiple Surface Crack propagation and coalescence, in which its final failure shows a stochastic nature on Crack initiation, propagation and coalescence under cyclic loadings. According to this, the competing failure modes of multiple Surface Cracks and interior Cracks are studied through coupling numerical simulations with fracture mechanics methods. In particular, a probabilistic procedure for modeling multiple Surface Crack propagation and coalescence is established by incorporating Monte Carlo simulation with experimental evidences, including Surface Crack density and Crack length distributions measured from LCF replica tests of 30NiCrMoV12 steel. In addition, it calculates the probability of coalescence of neighboring Cracks with allowance for their interactions and local plastic deformation at the Crack tips. Finally, it estimates the remaining usage lives of specimens from initial state to critical Cracks by propagation and coalescence of dispersed Cracks.
Bo Chen - One of the best experts on this subject based on the ideXlab platform.
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transition from internal to Surface Crack initiation of a single crystal superalloy in the very high cycle fatigue regime at 1100 c
International Journal of Fatigue, 2021Co-Authors: Zihua Zhao, F Zhang, Bo ChenAbstract:Abstract Transition from internal to Surface Crack initiation is controlled by oxidation assisted fatigue-Crack process in the very-high-cycle fatigue regime. Between 760 and 1000 °C, single Crack initiation site is associated with internal casting defect, followed by a crystallographic Stage I propagation. By contrast, multiple Surface Crack initiation sites appear at 1100 °C, as the consequence of internal oxide penetration. The fatal Crack follows a Mode I propagation and oxygen can diffuse into the material along the Crack path. γ′-phase depletion appears surrounding the oxidised and Cracked regions, while localised rafting can occur close to the Crack tip.
