Last. Na Qin(SWJTU: Southwest Jiaotong University)H-Index: 2
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Abstract null null Semi-circular bend specimens are used to measure the brittle materials' fracture toughness, such as brittle metals, rocks, and ceramic materials. The quasi-static and dynamic model I fracture toughness of tungsten heavy alloy, a typical brittle metal material, are measured using the semi-circular bend specimens under quasi-static compression and dynamic impact loadings. For quasi-static cases, the specimens are loaded on a universal testing machine with a constant loading spee...
#1Yan Wang(USST: University of Shanghai for Science and Technology)
#2Bocheng Zhao(USST: University of Shanghai for Science and Technology)
Last. Zhaofeng Qian(USST: University of Shanghai for Science and Technology)
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Abstract null null Diamond wire sawing is one of the key technologies in solar cell manufacturing process and semiconductor chip manufacturing process. The subsurface damage depth (SSD) affects the quality of machined surface in diamond wire sawing, which must be evaluated. In this paper, a mathematical model of the SSD in monocrystalline silicon wafers induced by ultrasonic vibration assisted diamond wire sawing (UAWS) was proposed. In this model, the input is the depth and deflection angle of ...
#1Zhiyang Zhao(USTB: University of Science and Technology Beijing)H-Index: 5
#2Renbo Song(USTB: University of Science and Technology Beijing)H-Index: 6
Last. Chunyang Hu(USTB: University of Science and Technology Beijing)H-Index: 1
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Abstract null null The in-plane impact test on non-standard samples limited by original materials is essential in assessing crack resistance due to its emersion of realistic stress conditions. The thickness effect on fracturing behaviors and crack resistances was investigated, based on Fe-3Si-0.9Al non-oriented silicon steel, one kind of brittle ferritic sheets. The “V-notch” impact samples with different thicknesses were obtained alternately with uniform microstructure. The crack resistances of...
Abstract null null Damage mechanics continuum criteria have been shown to provide an effective alternative to conventional fracture mechanics parameters to simulate ductile crack initiation in mild steel under large scale yielding and variable stress states. In this study, a damage mechanics initiation criterion, called the Stress Weighted Damage Model, is extended to simulate ductile crack propagation through an Adaptive Cohesive Zone model. The proposed approach regularizes the crack tip singu...
Abstract null null This study developed a novel approach to measure the intrinsic fracture toughness of full-depth fiber reinforced concrete (FRC) and functionally graded concrete (FGC) beams. Three concrete mixes were prepared to cast FGC beams, namely normal strength concrete to be cast in the middle layer of the FGC beams, FRC with 1% hooked-end steel fiber, to be cast in the bottom layer (tensile layer), and high strength concrete (HSC) to be cast in the top layer (compressive layer). Ninety...
Abstract null null In this study, detailed experimental results of a series of concrete fracture tests on published literatures were collected into a database named as CFT-DB. Based on large amount of experimental data, an artificial neural network (ANN) approach was employed to build connections between some influential factors and certain fracture parameters, and therefore to predict the corresponding fracture parameters. The fracture parameters investigated mainly were the initial cracking fr...
Abstract null null Asymmetric four-point bend fracture (AFPBF) tests and three-point bend end-notched flexure (3ENF) tests were performed on groove-free and side-grooved samples of western hemlock, and the Mode II fracture critical stress intensity factor (KIIc) was obtained. Differences in the KIIc values obtained from the AFPBF and 3ENF tests were significant. However, these differences were effectively reduced when the additional crack length Δ was introduced into the data reduction process. ...
#1Peng Hou(CDUT: Chengdu University of Technology)H-Index: 12
#2Shan-Jie Su(XZIT: Xuzhou University of Technology)H-Index: 2
Last. Zhizhen Zhang(CUMT: China University of Mining and Technology)H-Index: 7
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Abstract null null To enhance the ability of tight sandstone gas extraction, liquid nitrogen (LN2) freeze-thaw cycle method can be employed to improve the physical and mechanical properties of the sandstone. Rock fracture behaviors and mechanical properties after fracturing play an important role to successfully implement reservoir stimulation. Since tight sandstone gas reservoirs are usually characterized by high water content, the influences of LN2 freeze-thaw cycle on the fracture toughness a...
Last. Chun-Qing Li(RMIT: RMIT University)H-Index: 24
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Abstract null null The fracture resistance of elasto-plastic materials varies significantly depending on the mode mixities, i.e., the loading combinations. This paper aims to experimentally investigate the fracture resistance and behaviour of two grades of mild steel under various in-plane loading combinations. A loading fixture with high loading capacity and modified compact tension shear (CTS) specimen are designed to conduct fracture tests on elasto-plastic materials under various mode mixiti...
Abstract null null This paper proposes a machine learning strategy using radial basis function (RBF) as surrogate models for uncertainty quantification of age and time-dependent fracture mechanics problems. The RBF surrogate models are trained to replace the time-consuming evaluations of the mapping integral of the time-dependent energy release rate. The probabilistic problem considers input random variables of geometry, loading, and material parameters for a concrete plate section with the pres...
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