To improve the jet performance of a fire water monitor,the monitor head with three different inner contour lines were *** on FLUENT,the calculation domain was defined geometrically and then
To improve the jet performance of a fire water monitor,the monitor head with three different inner contour lines were *** on FLUENT,the calculation domain was defined geometrically and then
In order to evaluate the hydraulic performance of a regulator,the pressure loss and the stabilization performance of the regulator installed in the fire water monitor were *** effects of st
In order to evaluate the hydraulic performance of a regulator,the pressure loss and the stabilization performance of the regulator installed in the fire water monitor were *** effects of st
The complex sand-casting process combined with the interactions between process parameters makes it difficult to control the casting quality,resulting in a high scrap rate.A strategy based on a data-driven model was p...
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The complex sand-casting process combined with the interactions between process parameters makes it difficult to control the casting quality,resulting in a high scrap rate.A strategy based on a data-driven model was proposed to reduce casting defects and improve production efficiency,which includes the random forest(RF)classification model,the feature importance analysis,and the process parameters optimization with Monte Carlo *** collected data includes four types of defects and corresponding process parameters were used to construct the RF *** results show a recall rate above 90% for all *** Gini Index was used to assess the importance of the process parameters in the formation of various defects in the RF ***,the classification model was applied to different production conditions for quality *** the case of process parameters optimization for gas porosity defects,this model serves as an experimental process in the Monte Carlo method to estimate a better temperature *** prediction model,when applied to the factory,greatly improved the efficiency of defect *** show that the scrap rate decreased from 10.16% to 6.68%.
In this paper, a 2R1T (two rotations and one translation) over-constrained parallel mechanism R(2RPR)R/SP with two ordered continuous rotational axes is proposed, which contains fewer joints, by concatenating a 2-degr...
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The simulation of drilling condition and swing condition is completed with *** cutting patterns of cutting process is drawn for cutting head of longitudinal axial *** variations of c
The simulation of drilling condition and swing condition is completed with *** cutting patterns of cutting process is drawn for cutting head of longitudinal axial *** variations of c
In order to implement the optimization design for a forging aluminum wheel, the wheel's structural optimization design software, i.e. DWheel, was developed in this paper. DWheel was programmed based on C# and ANSY...
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The macro-scale and meso-scale simulation models of stainless steel clad plate were established by DEFORM-3D. The multi-scale coupling simulations of clad plate with different rolling parameters were carried out. The ...
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The horizontal yaw cutting condition of the picks was analyzed to study the load characteristics of a roadheader’s cutting *** on theoretical calculation,the range of the cutting angle was cert
The horizontal yaw cutting condition of the picks was analyzed to study the load characteristics of a roadheader’s cutting *** on theoretical calculation,the range of the cutting angle was cert
The shortage of water resources is a major challenge of the world,seawater desalination is the best way to solve the crisis of water *** osmosis membrane desalination equipment needs to
The shortage of water resources is a major challenge of the world,seawater desalination is the best way to solve the crisis of water *** osmosis membrane desalination equipment needs to
Basal fracture due to dwell fatigue (DF) is primary cause of core material failure during aero-engine service, which highlights the importance of understanding the crack initiation mechanism. In this study, the relati...
Basal fracture due to dwell fatigue (DF) is primary cause of core material failure during aero-engine service, which highlights the importance of understanding the crack initiation mechanism. In this study, the relationship between activation of plastic slip within the [0001] basal plane orientation, local strain and crack initiation in near-α Ti60 alloys was investigated using coupled in situ and high-resolution digital image correlation (HR-DIC) methods. The results show that basal slip is preferentially activated resulting into a higher shear strain in DF compared to [10 1 ¯ 0] prismatic orientation grains. Two types of cracking induced by strong basal slip were identified in grains with medium to high basal Schmidt factor (SF): slip transgranular cracking and basal twist grain boundary (BTGB) cracking. The slip deformation and strain evolution of the two types of cracks before and after their initiation were observed for the first time on the sample surface by in-situ dwell, which provides experimental and theoretical support for their formation mechanism. In order to constitute potential locations for crack nucleation, these regions have high local and shear strains during the basal slip stage prior to crack initiation. The higher local strain in the former is attributed to the intrusion and extrusion mechanism of the slip bands, while the latter is attributed to the inconsistency of the slip deformation of the microscopic dislocations on both sides of the BTGB making the GB slip-shear. Additionally, the incoordination on both sides of the GB, coupled with the inherently low cleavage energy, makes the BTGB more susceptible to cracking compared to slip transgranular cracking. No elemental segregation or β-phase influence was observed at the grain boundary interface. This study provides new insights into the mechanisms involved basal slip-induced cracking in Ti alloys subjected to dwell loadings.
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