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"Ex situ analysis of high-strength quenched and micro-alloyed steel dur" by Yao Lu, Haibo Xie et al.

This paper compares the microstructure and mechanical evolution in a high-strength quenched and micro-alloyed steel during the austenitising bending process. Simulation results indicated a new finding that the stress neutral layer (SNL) tends to move to the tension zone during straining. The hardness gradient detected from the centre to compression/tension zones was resulted from comprehensive factors: First of all, the location of SNL revealed a prominent impact on strength. Second, the dislocation accumulation would be responsible for the hardness gradient on the surfaces. In addition, the overall strength decrease during straining was mainly ascribed to integrated effects of dynamic recovery (DRV) and dynamic recrystallisation (DRX). Apart from that, overall smaller martensite packet size and coarser prior austenite grains resulted in the increased hardness value at a lower bending degree. Also, the high consistency between experimental and simulation results is instructive for the ....

Austenite Reconstruction , Ustenitising Bending , Igh Strength Quenched And Micro Alloyed Steel , Mechanical Property , Numerical Simulation ,

"Angle Shear Testing of 15.2 mm Seven Wire Cable Bolt" by Naj Aziz, Ali Mirzaghorbanali et al.

This paper focuses on the experimental study of shear testing of 15.2 mm, 25 t capacity seven wire cables at zero, 30° and 45° angles using two different shear testing facilities at the University of Wollongong (UOW) and the University of Southern Queensland (USQ) in Toowoomba. A circular double-shear rig MK-IV was used for testing cable perpendicular to the sheared joint faces (zero angle of orientation), while testing the cable at 30° and 45° was carried out using a larger-size rectangular-shaped rig. Testing was carried out based on the double-shear testing methodology wherein cable bolts were fully encapsulated using Stratabinder HS inside of three concrete blocks representing host rocks. This study was part of the tri-universities-funded ACARP project C27040 awarded jointly to the University of New South Wales, University of Wollongong and University of Southern Queensland. The objective of the experimental testing programme was to provide the essential information for the dev ....

University Of New South Wales , University Of Wollongong , University Of Southern Queensland , Southern Queensland , New South Wales , Cable Bolt , Nstallation Angle , Numerical Simulation , Retension Load , Hear Strength Properties ,

"Effect of pretension on the performance of cable bolts and its optimis" by Xu Li, Guangyao Si et al.

Pretension is the pre-added axial tensile force on fully grouted bolt systems, which include rock bolts and cable bolts. Although a series of studies via lab testing and analytical modelling proved the importance of pretension in cable bolts, there is no systematic analysis to guide the optimal pretension values to be applied on cable bolts in different engineering geological conditions. Complicated geological conditions, such as anisotropic in-situ stress, bedding plane detachment and country rock deformation, cannot be fully represented in the lab or analytical work. In addition, field scale numerical models to investigate cable bolt performance and its interaction with various geological conditions are rare. This paper analyses the effect of pretension on the performance of cable bolts in underground coal mines via field scale numerical models, with considering different geological conditions (in-situ stress, bedding plane stiffness and rock mass properties). Numerical models were d ....

Cable Bolt , Cable Failure , Coal Mines , Numerical Simulation ,

GaAs Nanostructures Improve Solar Cell Optical Properties

Compared to Si-based nanostructures, (GaAs)-based solar cell nanostructures have been found to have higher absorption properties. ....

Kumar Tenwar , Gaas Nanostructures , Prakash Samajdar , Research Findings , Materials Today , Efficiency Improvement , Image Credit , Numerical Simulation , Absorption Properties , Enhancing Absorption , Pulse Optics System , Simulation Tool ,

Frontiers | Fine-Scale Structures in the Mid-Level Eyewall of Super Typhoon Rammasun (2014) Simulated With the WRF-LES Framework

It has been numerically demonstrated that the turbulence above the boundary is important to tropical cyclone intensification and rapid intensification, but the three-dimensional structures of the sub-grid-scale (SGS) eddy have not been revealed due to the lack of observational data. In this study, two numerical simulations of Super Typhoon Rammasun (2014) were conducted with the Advanced Weather Research and Forecast (WRF) model by incorporating the large-eddy simulation (LES) technique, in which the enhanced eyewall convection and the process of rapid intensification are captured. Consistent with previous observational studies, the strong turbulent kinetic energy (TKE) is found throughout the whole eyewall inside of the radius of maximum wind in both experiments. The simulations indicate that the strong TKE is associated with horizontal rolls with the horizontal extent of 2-4 km, which are aligned azimuthally in the intense eyewall convection. It is indicated that the three-dimensiona ....

United States , Hainan Island , South China Sea , Brunei General , Typhoon Warning Center , Scientific Research Program Of Shanghai Municipal Science , National Natural Science Foundation Of China , European Planetary Science Congress , Yonsei University , Weather Research , Hurricane Weather Research , European Centre For Weather Forecasting , Technology Commission , China Meteorological Administration , Advanced Weather Research , Typhoon Rammasun , Joint Typhoon Warning Center , Super Typhoon Rammasun , Rapid Radiative Transfer Model , Qizhou Island , European Centre , Medium Range Weather Forecasting , Associated Mid Level Fine , Hurricanes Isabel , National Natural Science Foundation , Scientific Research Program ,