The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
S.v. Kamat - One of the best experts on this subject based on the ideXlab platform.
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Influence of mixed mode I/III loading on Dynamic Fracture Toughness of mild steel at room and low temperatures
Materials Science and Engineering: A, 2014Co-Authors: Kartik Prasad, M. Srinivas, S.v. KamatAbstract:Abstract The effect of loading angle, ϕ , on the Dynamic Fracture Toughness at room and low temperatures (−60 and −196 °C) as well as the effect of temperature on mode I and mixed mode I/III Dynamic Fracture Toughness for mild steel was studied using a modified Charpy test specimen. The Dynamic Fracture Toughness was found to increase with increasing loading angle or increasing mode III loading component at all three test temperatures. The mode I as well as mixed mode I/III Dynamic Fracture Toughness was also found to decrease with decrease in temperature below room temperature. The results were explained on the basis of the operative Fracture mechanisms and the nature of stress field ahead of crack under mode I and mixed-mode loading.
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Dynamic Fracture Toughness of a near alpha titanium alloy Timetal 834
Journal of Alloys and Compounds, 2009Co-Authors: Kartik Prasad, S.v. KamatAbstract:Abstract The Dynamic Fracture Toughness of Timetal 834 alloy under impact loading was evaluated using fatigue pre-cracked specimens and compared with the Fracture Toughness under static loading condition evaluated in an earlier study. It was found that the Dynamic Fracture Toughness under impact loading was higher than the Fracture Toughness value under static loading conditions. This behaviour was attributed to the effect of strain rate on strain hardening exponent and yield strength. The effect of notch root radius on Dynamic Fracture Toughness of this alloy was also studied. It was found that there exists a critical notch radius ( ρ 0 ) of ∼150 μm below which the Dynamic Fracture Toughness was independent of notch root radius. Above ρ 0 , the Dynamic Fracture Toughness increased linearly with square root of notch root radius.
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Static and Dynamic Fracture Toughness of an Al-Li 8090 alloy plate
Fatigue & Fracture of Engineering Materials and Structures, 1994Co-Authors: N. Eswara Prasad, S.v. Kamat, G. Malakondaiah, V. V. KutumbaraoAbstract:— The static and Dynamic Fracture Toughness of an Al-Li 8090 alloy plate was evaluated as a function of notch orientation. Static Fracture Toughness is marginally lower than the Dynamic Fracture Toughness in all the three notch orientations that were studied. The Fracture mechanism remains unchanged and the degree of in-plane anisotropy is significant, but more or less similar under static and Dynamic conditions.
Cao Mao - One of the best experts on this subject based on the ideXlab platform.
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A study of the method for Dynamic Fracture Toughness testing of laminated composites by SHPB technique
Materials Science and Technology, 2002Co-Authors: Cao MaoAbstract:In order to obtain Dynamic Fracture Toughness of laminates, the Hopkinson Pressure Bar technique was improved on basis of traditional testing system. The threepoint bending specimen was adopted in the Dynamic Fracture experiment, and the response curve of Dynamic stress intensity factor was obtained by the ANSYSED54 experimental system. Thus the Dynamic Fracture Toughness was determined. The representative testing results of laminates show that the equipment is effective and the testing method is a promising attempt,which can be used for reference.
C Han - One of the best experts on this subject based on the ideXlab platform.
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A method for testing interlaminar Dynamic Fracture Toughness of polymeric composites
Composites Part B: Engineering, 2004Co-Authors: C T Sun, C HanAbstract:Static and Dynamic Mode I delamination Fracture in two polymeric fiber composites was studied using a WIF test method. The Dynamic test was conducted on a Split Hopkinson Pressure Bar apparatus. Crack speeds up to 1000 m/s were achieved. Dynamic Fracture and crack propagation were modeled by the finite element method. Dynamic initiation Fracture Toughness of S2/8552 and IM7/977-3 composites were obtained. The Dynamic Fracture Toughness of IM7/977-3 associated with the high speed propagating crack was extracted from the finite element simulation based on the measured data. It was found that the Dynamic Fracture Toughness of the delamination crack propagating at a speed up to 1000 m/s approximately equals the static Fracture Toughness.
C T Sun - One of the best experts on this subject based on the ideXlab platform.
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A method for testing interlaminar Dynamic Fracture Toughness of polymeric composites
Composites Part B: Engineering, 2004Co-Authors: C T Sun, C HanAbstract:Static and Dynamic Mode I delamination Fracture in two polymeric fiber composites was studied using a WIF test method. The Dynamic test was conducted on a Split Hopkinson Pressure Bar apparatus. Crack speeds up to 1000 m/s were achieved. Dynamic Fracture and crack propagation were modeled by the finite element method. Dynamic initiation Fracture Toughness of S2/8552 and IM7/977-3 composites were obtained. The Dynamic Fracture Toughness of IM7/977-3 associated with the high speed propagating crack was extracted from the finite element simulation based on the measured data. It was found that the Dynamic Fracture Toughness of the delamination crack propagating at a speed up to 1000 m/s approximately equals the static Fracture Toughness.
Chen Jie - One of the best experts on this subject based on the ideXlab platform.
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Experimental Research of Quasi-static and Dynamic Fracture Toughness of 685 Homogeneous Steel
Journal of Experimental Mechanics, 2012Co-Authors: Chen JieAbstract:In order to investigate the crack initiation and development of 685 homogeneous steel under quasi-static loading and Dynamic loading,quasi-static Fracture Toughness and Dynamic Fracture Toughness were tested respectively by using quasi-static loading testing machine and modified Hopkinson bar and adopting three-point bend specimen.Fractographs reveal that twinned martensite causes the Fracture Toughness decline of 685 homogeneous steel.Carbon is the element that strongly promotes the formation of twinned martensite.So carbon content should be reduced properly to improve the Fracture Toughness of 685 homogeneous steel.When the loading rate I is under 1.8778×106MPam/s,the Dynamic Fracture Toughness of 685 homogeneous steel decreases with the increase of the loading rate.However,when the loading rate I is higher than 1.8778×106MPam/s,the Dynamic Fracture Toughness of 685 homogeneous steel rises due to the effect of thermal softening near the crack tip.Crack initiation and development were recorded by high speed camera technique.Crack propagation velocity was measured.The calculated Dynamic Fracture Toughness by using(Crack Mouth Opening Displacement) CMOD method is consistent with that calculated from the signal of resistance strain gauge.
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Progress in the research of Dynamic Fracture Toughness based on Hopkinson bar technique
Ordnance Material Science and Engineering, 2010Co-Authors: Chen JieAbstract:The experimental techniques of Dynamic Fracture Toughness based on Hopkinson bar technique were summarized.Some new improvements on the technique such as pulse shaping technique and force transducer were introduced.The methods of calculating Dynamic stress intensity factor and determining crack-initiation time were generalized briefly.The viewpoint of future development of Dynamic Fracture Toughness was proposed.
