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Three-Dimensional Mesoscopic Investigation on the Impact of Specimen Geometry and Bearing Strip Size Article

Zhangyu Wu, Jinhua Zhang, Hongfa Yu, Qin Fang, Haiyan Ma, Li Chen

Engineering 2022, Volume 17, Issue 10,   Pages 110-122 doi: 10.1016/j.eng.2021.02.024

Abstract: geometry and bearing strip size, a three-dimensional (3D) mesoscale modeling approach with considerationWe established 12 different specimen models with two specimen shapes (i.e., a cube with an edge lengthThe effects of specimen geometry and strip width on the splitting-tensile properties of CAC, such asThe fst values of CAC are associated with both the specimen geometry and width of the bearing strip.are slightly higher than those of the cylinder model for the same bearing strip size, representing geometry

Keywords： Coral aggregate concrete     3D mesoscopic modelling     Split-tension test     Tensile strength     Specimen geometry    

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Russian school of the theory and geometry of gearing: Its origin and golden period (1935 --1975)

Dmitry BABICHEV,Sergey LAGUTIN,Natalya BARMINA

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 1,   Pages 44-59 doi: 10.1007/s11465-015-0360-z

Abstract: second half of the twentieth century, Soviet scientists were among the world leaders in the theory and geometry

Keywords： theory of gearing (TG)     gear geometry     generating surface     gear synthesis     gear analysis    

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A new proof of Honeycomb Conjecture by fractal geometry methods

Tong ZHANG, Kai DING

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 4,   Pages 367-370 doi: 10.1007/s11465-013-0273-7

Abstract:

Based on fractal geometry, we put forward a concise and straightforward method to prove Honeycomb

Keywords： Honeycomb Conjecture     fractal geometry     hierarchical fractal structure    

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Transmission probability method based on triangle meshes for solving the unstructured geometry neutron

WU Hongchun, LIU Pingping, ZHOU Yongqiang, CAO Liangzhi

Frontiers in Energy 2007, Volume 1, Issue 2,   Pages 158-166 doi: 10.1007/s11708-007-0020-z

Abstract: The fuel assembly or core with unstructured geometry is frequently used in the advanced reactor.The triangle meshes are most useful for expressing the complicated unstructured geometry.though the finite element method and Monte-Carlo method are well suited for solving the unstructured geometryThis code was applied to the hybrid fuel geometry, and compared with the results of the MCNP code and

Keywords： unstructured geometry     assembly     transmission probability     TPM     rectangular    

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Experimental studies of ash film fractions based on measurement of cenospheres geometry in pulverized

Siqi LIU, Yanqing NIU, Liping WEN, Yang LIANG, Bokang YAN, Denghui WANG, Shi’en HUI

Frontiers in Energy 2021, Volume 15, Issue 1,   Pages 91-98 doi: 10.1007/s11708-020-0806-9

Abstract: A scanning electron microscope (SEM) and cross-section analysis have been used to study the geometry

Keywords： ash film fraction     cenospheres     coal combustion     fly ash    

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Effects of delamination in drilling glass/polyester composite

Mehdi GANJIANI, Majid SAFARABADI, Nabi MEHRI-KHANSARI, Hossein ORUJI

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2,   Pages 552-567 doi: 10.1007/s11709-021-0699-7

Abstract: Considering failures during machinery processes such as drilling, a precautionary analysis involving delamination and the corresponding dissipated energy is required, especially for composite structures. In this context, because of the complexity of both the analysis procedure and experimental test setup, most studies prefer to represent mode I and III interlaminar crack propagation instead of that involving mode II. Therefore, in this study, the effect of mode delamination and corresponding interlaminar crack propagation was considered during the drilling process of multilayered glass/polyester composites using both numerical and experimental approaches. In the experimental procedure, the mechanical properties of the glass/polyester specimens were obtained according to ASTM D3039. In addition, the interlaminar mixed-mode (I/II) loadings were determined using an ARCAN test fixture so that the fracture toughness of glass/polyester could then be identified. The mode II critical strain energy release rate (CSERR) was then obtained using an experimental test performed using an ARCAN fixture and the virtual crack closure technique (VCCT). It was determined that the numerical approach was in accordance with the experiments, and more than 95% of crack propagation could be attributed to mode II compared to the two other modes.

Keywords： delamination     VCCT     ARCAN specimen     drilling     mode II    

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Numerical verification of geometry control theory of the construction for super-span cable-stayed bridge

Huang Can, Bu Yizhi, Zhang Qinghua

Strategic Study of CAE 2009, Volume 11, Issue 1,   Pages 87-91

Abstract: style="text-align: justify;">Take Sutong Bridge as the subject investigated, the correctness of the geometryTaking the impact of geometry non-linear during construction into account, the simulation results indicateGeometry control theory applied to control the super-span cable-stayed bridge construction, and satisfiedoutcome of construction control can be achieved based on geometry control theory.

Keywords： cable-stayed bridge     geometry control     geometrical nonlinear     numerical verification    

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Experimental study of the effects of structured surface geometry on water spray cooling performance in

Minghou LIU, Yaqing WANG, Dong LIU, Kan XU, Yiliang CHEN

Frontiers in Energy 2011, Volume 5, Issue 1,   Pages 75-82 doi: 10.1007/s11708-010-0014-0

Abstract: Experiments were conducted to study the effects of enhanced surfaces on heat transfer performance during water spray cooling in non-boiling regime. The surface enhancement is straight fin. The structures were machined on the top surface of heated copper blocks with a cross-sectional area of 10 mm×10 mm. The spray was performed using Unijet full cone nozzles with a volumetric flux of 0.044–0.053 m /(m ·s) and a nozzle height of 17 mm. It is found that the heat transfer is obviously enhanced for straight fin surfaces relative to the flat surface. However, the increment decreases as the fin height increases. For flat surface and enhanced surfaces with a fin height of 0.1 mm and 0.2 mm, as the coolant flux increases, the heat flux increases as well. However, for finned surface with a height of 0.4 mm, the heat flux is not sensitive to the coolant volumetric flux. Changed film thickness and the form of water/surface interaction due to an enhanced surface structure (different fin height) are the main reasons for changing of the local heat transfer coefficient.

Keywords： spray cooling     finned surface     heat transfer    

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The research on method of geometry-control during erection of the short-line bridge

Wang Min,Zhang Yongtao,Liu Jinghong,Liu Yi,Huang Yue

Strategic Study of CAE 2009, Volume 11, Issue 11,   Pages 79-81

Abstract:

Focus on error control during fabricating and suspended splicing of box girders with segmentation method. After the analysis of the error reasons, and the combination with practical engineering—Sutong B2, it discussed control method, computing method and sensitive analysis method of linear control of prefabricated pre-stressed continuous beam bridge assembly with short line method.

Keywords： geometry-control     error analysis     least square method     erection of the short-line method    

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Edge preparation methods for cutting tools: a review

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 4, doi: 10.1007/s11465-023-0766-y

Abstract: Edge preparation can remove cutting edge defects, such as burrs, chippings, and grinding marks, generated in the grinding process and improve the cutting performance and service life of tools. Various edge preparation methods have been proposed for different tool matrix materials, geometries, and application requirements. This study presents a scientific and systematic review of the development of tool edge preparation technology and provides ideas for its future development. First, typical edge characterization methods, which associate the microgeometric characteristics of the cutting edge with cutting performance, are briefly introduced. Then, edge preparation methods for cutting tools, in which materials at the cutting edge area are removed to decrease defects and obtain a suitable microgeometry of the cutting edge for machining, are discussed. New edge preparation methods are explored on the basis of existing processing technologies, and the principles, advantages, and limitations of these methods are systematically summarized and analyzed. Edge preparation methods are classified into two categories: mechanical processing methods and nontraditional processing methods. These methods are compared from the aspects of edge consistency, surface quality, efficiency, processing difficulty, machining cost, and general availability. In this manner, a more intuitive understanding of the characteristics can be gained. Finally, the future development direction of tool edge preparation technology is prospected.

Keywords： edge preparation method     preparation principle     cutting edge geometry     edge characterization     tool performance    

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Effect of strata restraint on seismic performance of prefabricated sidewall joints in fabricated subway stations

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 5,   Pages 763-779 doi: 10.1007/s11709-023-0917-6

Abstract: A disadvantage of the conventional quasi-static test method is that it does not consider the soil restraint effect. A new method to test the seismic performance of prefabricated specimens for underground assembled structures is proposed, which can realistically reflect the strata restraint effect on the underground structure. Laboratory work combined with finite element (FE) analysis is performed in this study. Three full-scale sidewall specimens with different joint forms are designed and fabricated. Indices related to the seismic performance and damage modes are analyzed comprehensively to reveal the mechanism of the strata restraint effect on the prefabricated sidewall components. Test results show that the strata restraint effect effectively improves the energy dissipation capacity, load-bearing capacity, and the recoverability of the internal deformation of the precast sidewall components. However, the strata restraint effect reduces the ductility of the precast sidewall components and aggravates the shear and bending deformations in the core region of the connection joints. Additionally, the strata restraint effect significantly affects the seismic performance and damage mode of the prefabricated sidewall components. An FE model that can be used to conduct a seismic performance study of prefabricated specimens for underground assembled structures is proposed, and its feasibility is verified via comparison with test data.

Keywords： underground structures     precast sidewall specimen     seismic test method     bearing capacity     energy dissipation    

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Function-geometry integrated precision machining methodsand technologies for high performance workpieces

Guo Dongming

Strategic Study of CAE 2011, Volume 13, Issue 10,   Pages 47-57

Abstract: The machining of these key parts has changed from pure geometric accuracy requirements to performance-geometryDue to the case that the part performance has complex coupled effect with many factors such as part geometryIt provides an effective reference and guidance for the establishment of performance-geometry integrated

Keywords： high performance     function-geometry integration     precision machining     difficult-to-cut material     complex    

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Effects of rotor and stator geometry on dissolution process and power consumption in jet-flow high shear

Lin Yang, Wenpeng Li, Junheng Guo, Wei Li, Baoguo Wang, Minqing Zhang, Jinli Zhang

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 2,   Pages 384-398 doi: 10.1007/s11705-020-1928-7

Abstract: The jet-flow high shear mixer (JF-HSM) is a new type of intensified equipment with special configurations of the rotor and the stator. The mass transfer property and power consumption were studied in the solid-liquid system for a series of JF-HSMs involving different configuration parameters, such as rotor diameter, rotor blade inclination, rotor blade bending direction, stator diameter, and stator bottom opening diameter. The flow characteristics were examined by computational fluid dynamic simulations. Results indicate that the turbulent power consumption of the JF-HSM is affected by the change in rotor blade inclination and stator bottom opening. With the increase in the shear head size and the change in the rotor into a backward-curved blade, the solid-liquid mass transfer rate can be remarkably increased under the same input power. Dimensionless correlations for the mass transfer coefficient and power consumption were obtained to guide the scale-up design and selection of such a new type of equipment to intensify the overall mixing efficiency.

Keywords： jet-flow high shear mixer     solid particle dissolution     power consumption characteristics     CFD Simulation    

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Experimental study on compaction-induced anisotropic mechanical property of rockfill material

Xiangtao ZHANG, Yizhao GAO, Yuan WANG, Yu-zhen YU, Xun SUN

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 1,   Pages 109-123 doi: 10.1007/s11709-021-0693-0

Abstract: For high-density rockfill materials, a set of specimen preparation devices for inclined compaction planesprincipal stress direction angles can change the extent of the particle interlocking effect, causing the specimen

Keywords： rockfill     inclination of specimen preparation     anisotropy     mechanical property     mechanism    

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Modeling yarn-level geometry from a single micro-image Special Feature on Virtual Reality-Research Articl

Hong-yu WU, Xiao-wu CHEN, Chen-xu ZHANG, Bin ZHOU, Qin-ping ZHAO

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 9,   Pages 1165-1174 doi: 10.1631/FITEE.1800693

Abstract: Despite its importance in applications such as cloth rendering and simulation, capturing yarn-level geometryIn this paper, we propose a novel method that can produce the yarn-level geometry of real cloth usingGiven a single input image, our method estimates the large-scale yarn geometry by image shading, andExperimental results indicate that our method can capture the detailed yarn-level geometry of a wide

Keywords： Single micro-images     Yarn geometry     Cloth appearance    

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Title Author Date Type Operation

Three-Dimensional Mesoscopic Investigation on the Impact of Specimen Geometry and Bearing Strip Size

Zhangyu Wu, Jinhua Zhang, Hongfa Yu, Qin Fang, Haiyan Ma, Li Chen

Journal Article

Russian school of the theory and geometry of gearing: Its origin and golden period (1935 --1975)

Dmitry BABICHEV,Sergey LAGUTIN,Natalya BARMINA

Journal Article

A new proof of Honeycomb Conjecture by fractal geometry methods

Tong ZHANG, Kai DING

Journal Article

Transmission probability method based on triangle meshes for solving the unstructured geometry neutron

WU Hongchun, LIU Pingping, ZHOU Yongqiang, CAO Liangzhi

Journal Article

Experimental studies of ash film fractions based on measurement of cenospheres geometry in pulverized

Siqi LIU, Yanqing NIU, Liping WEN, Yang LIANG, Bokang YAN, Denghui WANG, Shi’en HUI

Journal Article

Effects of delamination in drilling glass/polyester composite

Mehdi GANJIANI, Majid SAFARABADI, Nabi MEHRI-KHANSARI, Hossein ORUJI

Journal Article

Numerical verification of geometry control theory of the construction for super-span cable-stayed bridge

Huang Can, Bu Yizhi, Zhang Qinghua

Journal Article

Experimental study of the effects of structured surface geometry on water spray cooling performance in

Minghou LIU, Yaqing WANG, Dong LIU, Kan XU, Yiliang CHEN

Journal Article

The research on method of geometry-control during erection of the short-line bridge

Wang Min,Zhang Yongtao,Liu Jinghong,Liu Yi,Huang Yue

Journal Article

Edge preparation methods for cutting tools: a review

Journal Article

Effect of strata restraint on seismic performance of prefabricated sidewall joints in fabricated subway stations

Journal Article

Function-geometry integrated precision machining methodsand technologies for high performance workpieces

Guo Dongming

Journal Article

Effects of rotor and stator geometry on dissolution process and power consumption in jet-flow high shear

Lin Yang, Wenpeng Li, Junheng Guo, Wei Li, Baoguo Wang, Minqing Zhang, Jinli Zhang

Journal Article

Experimental study on compaction-induced anisotropic mechanical property of rockfill material

Xiangtao ZHANG, Yizhao GAO, Yuan WANG, Yu-zhen YU, Xun SUN

Journal Article

Modeling yarn-level geometry from a single micro-image

Hong-yu WU, Xiao-wu CHEN, Chen-xu ZHANG, Bin ZHOU, Qin-ping ZHAO

Journal Article