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Journal articles on the topic 'Hole shrinkage'

Author: Grafiati
Published: 4 June 2021
Last updated: 26 July 2025

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1

Duan, Zhi Dong, Ya Ping Duan, and Pei Wu Yan. "Influencing Factors Analysis of Stability of Hole Wall of Bored Pile in Seasonal Frozen Ground in the West of China." Applied Mechanics and Materials 256-259 (December 2012): 441–44. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.441.

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Collapsing and shrinkage of hole wall are two troubles to drilling of bored pile. In order to avoid such troubles, ultimate hole depth of bored pile was deduced with dry excavation technology. To hydraulic excavation technology, by the method of finite element numerical simulation and finite element strength reduction, excavation process of hole of bored pile are simulated in ADINA and ANSYS software, The influences of hole radius, hole depth, power of rotary drilling rig and pressure of auger boring tool on stability of hole wall are analyzed. The analysis indicate that the major problem of s
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2

Li, Jian Zhong, Tao Wu, and Long Zhang. "A Method of Machining Micro Hole and Micro Cavity in Ceramics." Applied Mechanics and Materials 130-134 (October 2011): 923–26. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.923.

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For machining micro hole and micro cavity in ceramics, a manufacturing methods based on green machining have been systematically researched. The micro tool was prepared on-machine by micro electrical discharge machining (EDM). The tool size for micro hole drilling was determined based on extensive experimental results of the sintering shrinkage ratio and the gap caused by the removed ceramics particles between the tool and the workpiece to achieve the desired hole diameter. The tool path design was based on the tool size, the shrinkage ratio and the gap which is different from that in micro ho
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3

Zhu, Lei, Tongxing Zuo, Chong Wang, Qianglong Wang, Zhengdong Yu, and Zhenyu Liu. "Hole Appearance Constraint Method in 2D Structural Topology Optimization." Mathematics 12, no. 17 (2024): 2645. http://dx.doi.org/10.3390/math12172645.

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A 2D topology optimization algorithm is proposed, which integrates the control of hole shape, hole number, and the minimum scale between holes through the utilization of an appearance target image. The distance between the structure and the appearance target image is defined as the hole appearance constraint. The appearance constraint is organized as inequality constraints to control the performance of the structure in an iterative optimization. Specifically, hole shapes are controlled by matching adaptable equivalent shape templates, the minimum scales between holes are controlled by a hole s
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4

Xu, Zhen Ying, Yun Wang, Pei Long Dong, and Kai Xiao. "Shrinkage Optimization of Flat Receptacle Using the Finite Element Method." Materials Science Forum 575-578 (April 2008): 478–82. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.478.

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Flat receptacle, which is used in extruding the large aluminum profiles, is in harsh work conditions. Due to the irregularity of inner hole of flat receptacle, inconsistent resistance of shrinking fitting affects the inner hole within which nonuniform deformation occurs. If the nonuniformity exceeds the specified dimension accuracy, tiresome work including mould repairing and structure optimization has to be done. ANSYS is used to simulate the flat receptacle. It is shown that the maximum stress appears in the arc area of inner hole. Therefore, we present one new method using the preloaded lay
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5

Peng, Xianwei, Dongmei Ji, and Yuxin Zhang. "Analysis of cooling characteristics of the fan-shaped hole in a flame tube of gas turbine." Journal of Physics: Conference Series 3021, no. 1 (2025): 012050. https://doi.org/10.1088/1742-6596/3021/1/012050.

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Abstract In order to further improve the cooling performance of the combustion chamber flame tube, a fan-shaped hole film cooling structure with higher cooling performance is proposed. The numerical simulation method is used to compare and analyze the flow heat transfer and cooling characteristics of traditional cylindrical holes, shrinkage holes, crescent holes, and fan-shaped holes when the blowing ratio is 0.5-2.5. The calculation results show that: The comprehensive cooling efficiency of the four types of holes has the same trend along the mainstream flow direction and increases with the i
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6

Wei, Zhong Liang, and Lin Ge. "The Research and Application of Drilling Fluids Technology in Zhoushen Well X1." Advanced Materials Research 201-203 (February 2011): 1558–61. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.1558.

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Zhoushen Well X1 is a deep and exploration well, there are some difficulties in drilling fluids treating: The borehole is large, the open hole is long and the rock density proportion is high in the overlying strata. So the drilling fluids must have good suspended and sand carrying; there are brown mudstone, gypsum mudstone and light gray fine sandstone in the lower strata, swelling and hole shrinkage always happen. So the key point is ensuring well wall stability and preventing swelling and hole shrinkage. The drilling fluids must have strong Calcium-tolerance and good compatibility with forma
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7

Shyrin, Leonid, Yevhenii Koroviaka, Valerii Rastsvietaiev, and Oleksandr Denyshchenko. "Substantiating rational parameters of a method for shrinkage ore stoping while developing thin-vein steeply inclined deposits." E3S Web of Conferences 60 (2018): 00022. http://dx.doi.org/10.1051/e3sconf/20186000022.

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Objective of the paper is to substantiate rational ore-stoping technique while using small wells in the context of thin-vein steeply inclined deposit mining. The technique is based upon the repeated field studies and simulation of ore drawing processes for shrinkage ore stoping in terms of the oriented drilling of periphery holes. A design of a blast-hole charge with low-density porous intermediate layer has been proposed as a result as well as a mechanism of shock-wave propagation within rock mass in the process of thin steeply inclined vein stoping. Scientific novelty is represented by means
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8

Jiang, Yin Fang, Yi He, Yu Zhong He, Xiao Ming Qian, and Yu Huang. "Analysis and Optimization on the Gating System of Aluminum Alloy Piston in Casting." Applied Mechanics and Materials 80-81 (July 2011): 32–35. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.32.

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Shrinkage porosity defects occurring in ring groove underside the pin hole of aluminum piston are strongly influenced by the time-varying temperature profiles inside the solidifying casting. By adopting the finite element analysis software PROCAST and combining with production practice, the gating system which has open-cycle ring feeding channel in the bottom of the piston was compared with conventional techniques; the influence of opening angle of ring feeding channel and different process parameters on shrinkage distribution was researched. The results show the gating system with open-cycle
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9

Son, Keunbada, and Kyu-Bok Lee. "A Novel Method for Precise Guided Hole Fabrication of Dental Implant Surgical Guide Fabricated with 3D Printing Technology." Applied Sciences 11, no. 1 (2020): 49. http://dx.doi.org/10.3390/app11010049.

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A dental implant surgical guide fabricated by 3-dimensional (3D) printing technology is widely used in clinical practice due to its convenience and fast fabrication. However, the 3D printing technology produces an incorrect guide hole due to the shrinkage of the resin materials, and in order to solve this, the guide hole is adjusted using a trimmer or a metal sleeve is attached to the guide hole. These methods can lead to another inaccuracy. The present method reports a technique to compensate for a decreased guide hole caused by shrinkage that can occur when a computer-guided implant surgical
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10

Duan, Zhi Dong, Ya Ping Wu, and Pei Wu Yan. "Numerical Analysis of Drilling Process of Bored Pile in Seasonal Frozen Ground in the West of China." Applied Mechanics and Materials 256-259 (December 2012): 503–6. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.503.

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In order to research shrinkage of hole-wall and plastic region around hole-wall of bored pile in drilling process, a porous analysis model was built, and drilling process of bored pile, under dry excavation technology and hydraulic excavation technology, were simulated by element birth and death feature in ADINA software. Numerical analysis results show that to seasonal frozen ground in the west of China, dry excavation technology is not appropriate, consolidation settlement caused by drilling is small and can be taken into no consideration in design, major problem in hydraulic excavation tech
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11

Zhao, Xiu Shao, Lin Li Mo, and Da Xin Geng. "The Analysis of Long Spiral Drilling Hole’s Deformation with Finite Element." Advanced Materials Research 168-170 (December 2010): 206–10. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.206.

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The long spiral CFG pile construction often causes crack while in saturated slit. 3D finite element model is carried out, and the deformation of drilling hole is analyzed. The deformation’s factors are emphtically discussed such as drilling depth, dumped-soil load, soil strength, groundwater level etc. The results show that uneven settlement and horizontal displacement are relatively small while silt has high strength. The reduced soil strength is the main factor of drilling holes’ deformation, which causes serious hole shrinkage and the soil is brought to surface with spiral blade, and then c
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12

Wang, Changrui, Zhen Lu, and Kaifeng Zhang. "Fabrication of Micro-Parts with High-Aspect Ratio Micro-Hole Array by Micro-Powder Injection Molding." Materials 11, no. 10 (2018): 1864. http://dx.doi.org/10.3390/ma11101864.

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The present study investigated high-aspect ratio micro-hole array parts which were made by ZrO2 micro-powder with different particle sizes and micro-powder injection molding technology. It analysed the influence of particle sizes on feedstock, debinding and sintering of ceramic nozzles with multi-micro-holes. The forming quality of ceramic nozzles with multi-micro-holes was discussed in this paper. The results show that the two mixed ZrO2 feedstocks have fine uniformity. The average deviation of the feedstock made with 200 nm powder was −2%, and the average deviation of the feedstock made with
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13

Gao, Cun Zhen, Di Xin Yang, Jing Pei Xie, Ai Qin Wang, and Wen Yan Wang. "Casting Process Optimization for Large Bearing Bush of Zinc-Base Alloy." Materials Science Forum 704-705 (December 2011): 40–44. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.40.

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The numerical simulation of temperature gradient in the solidification process for large bushing castings of zinc-base alloy was made with HUAZHU CAE/Inte-CAST10.0 software in this paper. Tendency and the position of shrinkage were predicted,and the effect of cooling water rate and cooling time on temperature gradient and shrinkage during the molten metal solidification was discussed. The results show that:seting chilled iron at bottom of bearing bush and using water-cooling metal core in inner cavity of casting simultaneously, can eliminated shrinkage hole and porosity.
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14

Bikbova, Guzel, Toshiyuki Oshitari, Takayuki Baba, Shuichi Yamamoto, and Keisuke Mori. "Pathogenesis and Management of Macular Hole: Review of Current Advances." Journal of Ophthalmology 2019 (May 2, 2019): 1–7. http://dx.doi.org/10.1155/2019/3467381.

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Macular hole has been believed to be a disorder of vitreomacular interface, which forms as a result of abnormal vitreous traction from incomplete vitreous detachment. However, our recent studies demonstrated that dynamic forces, caused by mobile posterior cortical vitreous with fluid currents, exist already at early stages of macular hole development. Therefore, in eyes with flexible vitreous, the contributions of tractional forces due to vitreous shrinkage are unlikely. These facts indicate that in the development of idiopathic macular holes, there is a greater contribution of dynamic forces
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15

Merzouki, Johan, Gérard Poulachon, Frédéric Rossi, Yessine Ayed, and Guillaume Abrivard. "Method of Hole Shrinkage Radial Forces Measurement in Ti6Al4V Drilling." Procedia CIRP 58 (2017): 629–34. http://dx.doi.org/10.1016/j.procir.2017.03.226.

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16

Merzouki, Johan, Gérard Poulachon, Frédéric Rossi, Yessine Ayed, and Guillaume Abrivard. "Effect of cryogenic assistance on hole shrinkage during Ti6Al4V drilling." International Journal of Advanced Manufacturing Technology 108, no. 9-10 (2020): 2675–86. http://dx.doi.org/10.1007/s00170-020-05381-z.

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17

Wang, Ji, Yue Li, and Ming Zhong Zhang. "Shrinkage Performance and Cracking Resistance Mechanism of Rubberized Lightweight Aggregate Concrete with Polymer." Key Engineering Materials 385-387 (July 2008): 817–20. http://dx.doi.org/10.4028/www.scientific.net/kem.385-387.817.

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To improve the cracking resistance of lightweight aggregate concrete, rubber particles and polymer were added. Experimental results showed that the shrinkage rate increased when rubber particles were added into lightweight aggregate concrete, but when polymer was mixed, the shrinkage rate decreased dramatically. Microstructure analysis indicated that the interface transition zone (ITZ) influenced the shrinkage performance of rubberized lightweight aggregate concrete with polymer directly; the ITZ bondage between rubber particles and cement matrix was very poor and the restriction to shrinkage
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18

BURAEVA, G. M., A. V. SHISTEEV, and M. K. BURAEV. "PROCESSING THE HOLE OF THE SUPPORT ROLLER FOR TRACTOR SUSPENSION SYSTEM BY STITCHING." Tekhnicheskiy servis mashin 62, no. 3 (2024): 91–96. http://dx.doi.org/10.22314/2618-8287-2024-62-3-91-96.

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Restoring the surface of the roller treadmill to its nominal value using automatic surfacing technology makes it possible to obtain a significant surfacing layer with a sufficient degree of strength and wear resistance. At the same time, as a result of thermal action, the metal of the roller receives a linear shrinkage, due to which the diameter of the hole for the bearing of the roller axis decreases. In this case, it becomes impossible to install the outer bearing cage. (Research purpose) The research purpose is substantiating the method of processing the seat under the outer bearing cage af
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19

Xu, Shaoyun, Peiwei Gao, Lingling Huang, Longlong Tang, Xingqing Gu, and Limin Wang. "Experimental Research on Mechanical and Shrinkage Properties of Alkali Activated Low-Carbon Green Concrete." Materials 15, no. 17 (2022): 5984. http://dx.doi.org/10.3390/ma15175984.

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This paper describes orthogonal experiments to investigat the effects of content of fly ash and slag, sol ratio, modulus of sodium silicate and expander on the compressive strength and shrinkage of alkali activated low-carbon green concrete (AAGC) of different ages. The microstructures and hydration product compositions of AAGC with different proportions were further studied by Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Mercury Intrusion Porosimetry (MIP). The results show that with an increase of fly ash content, the compressive strength of AAGC gradually decreases, the d
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20

Qiao, Hong Xia, Long Hua, Zhong Mao He, and Jin Mei Dong. "Research on Performance of Green Light Aggregate Six Hole Brick." Applied Mechanics and Materials 99-100 (September 2011): 1171–74. http://dx.doi.org/10.4028/www.scientific.net/amm.99-100.1171.

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This paper researches the green six hole brick with crushing autoclaved aerated concrete block and fly ash as the main raw material, and researches its strength, shrinkage and frost resistance in natural maintenance condition and wet maintenance condition by experiment. Research results show that the six hole brick not only keeping environmental health, saving energy and recycling, but also its performance meet the relevant requirements, so it deserves popularization and application.
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21

Lukash, A. A., and N. P. Lukutsova. "Determination of the Geometric Parameters of Round Logs as Functional Materials for Wooden Housing Construction." Solid State Phenomena 284 (October 2018): 944–49. http://dx.doi.org/10.4028/www.scientific.net/ssp.284.944.

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The article is devoted to the study of strength and thermal insulation properties of logs OBrien. To prevent shrinkage and surface cracks it is proposed to dry logs through the through longitudinal hole. The proposed method is the method of determining geometric parameters of longitudinal openings for the drying of logs, provided that the strength of the logs for a given it load in the design of the exterior walls of the typical wooden house. The stress-strain state of round logs in the outer walls of a wooden frame with a longitudinal hole diameters was studied. It was found that the most dan
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22

Kim, Sang-Kon. "Modeling and analyzing for contact hole shrinkage by directed self-assembly." Journal of the Korean Physical Society 65, no. 10 (2014): 1701–5. http://dx.doi.org/10.3938/jkps.65.1701.

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23

Jang, J.-H., S.-H. Park, and I.-N. Hwang. "Polymerization Shrinkage and Depth of Cure of Bulk-Fill Resin Composites and Highly Filled Flowable Resin." Operative Dentistry 40, no. 2 (2015): 172–80. http://dx.doi.org/10.2341/13-307-l.

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SUMMARY The aim of this study was to evaluate the polymerization behavior and depth of cure (DOC) of recently introduced resin composites for posterior use: highly filled flowable composite and composites for bulk fill. A highly filled flowable (G-aenial Universal Flo [GUF]), two bulk-fill flowables (Surefil SDR Flow [SDR] and Venus Bulk fill [VBF]), and a bulk-fill nonflowable composite (Tetric N-Ceram Bulk fill [TBF]) were compared with two conventional composites (Tetric Flow [TF], Filtek Supreme Ultra [FS]). Linear polymerization shrinkage and polymerization shrinkage stress were each meas
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24

Qian, Kuang Liang, Tao Meng, Xiao Qian Qian, and Shu Lin Zhan. "Research on Some Properties of Fly Ash Concrete with Nano-CaCO3 Middle Slurry." Key Engineering Materials 405-406 (January 2009): 186–90. http://dx.doi.org/10.4028/www.scientific.net/kem.405-406.186.

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Some long-term properties such as anti-carbonation properties, shrinkage, penetrability of chloride ion of fly ash concrete with nano-CaCO3 middle slurry were studied. Test results showed that the properties of anti-carbonation and impenetrability for chloride of fly ash concrete increased by adding nano-CaCO3 middle slurry because the tiny hole was filled by nano-CaCO3 and the density of concrete increased. But at the same time, the shrinkage of fly ash concrete with and without nano-CaCO3 was the same. Results of SEM also implied the hydration degree of fly ash could be increased by nano-CaC
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25

Maiorova, Kateryna, Iurii Vorobiov, Oleksii Andrieiev, Borys Lupkin, and Valeriy Sikulskiy. "Forming the geometric accuracy and roughness of holes when drilling aircraft structures made from polymeric composite materials." Eastern-European Journal of Enterprise Technologies 2, no. 1 (116) (2022): 71–80. http://dx.doi.org/10.15587/1729-4061.2022.254555.

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The subject of this study is indicators of the quality, geometric accuracy, and roughness of holes in aviation structures (AS) made from polymeric composite materials (PCM) produced by drilling. The indicators of quality, geometric accuracy, and roughness of PCM holes were investigated by using kinematic hole drilling schemes and the creation of PCM chips. A kinematic scheme has been built of the cutting forces operating in PCM when drilling with the distribution of zones from 0° to 360°. Experimental studies on the establishment of characteristic shrinkage zones in the drilling of PCM, as wel
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26

Maiorova, Kateryna, Oleksii Andrieiev, Borys Lupkin, Victor Antonyuyk, and Sergii Vysloukh. "Formation of the quality of holes obtained by drilling in aviation structures made from polymer composite materials." Eastern-European Journal of Enterprise Technologies 3, no. 1 (123) (2023): 59–67. http://dx.doi.org/10.15587/1729-4061.2023.279618.

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The subject of this study is the quality indicators (geometric accuracy, roughness, cylindricity and taperness) of holes obtained by drilling in aircraft structures (AS) made of polymeric composite materials (PCM). The quality indicators of holes in AS made from PCM were studied by using kinematic schemes across and along the direction of drilling. A kinematic scheme of formation of the predicted surface roughness of the hole in AS made from PCM has been built. The calculation of the predicted roughness of PCM holes taking into account the geometry of the drill and drilling modes has been prop
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27

Sydor, Maciej, Jerzy Majka, and Nadežda Langová. "Effective diameters of drilled holes in pinewood in response to changes in relative humidity." BioResources 16, no. 3 (2021): 5407–21. http://dx.doi.org/10.15376/biores.16.3.5407-5421.

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Wood swelling and shrinkage affect the cooperation among the elements of furniture and should be considered during design. This study investigated the influence of moisture changes to the effective diameter of holes drilled in narrow and in wide sides of pine blanks. The moisture content (MC) of all samples has been averaged to 11.3-11.8% (air-conditioning for 4 month with RH = 60 ± 1% and t = 20 ± 1 °C). The 12 mm holes were drilled in radial and tangential directions of the samples. The MC in half of the samples was increased to 17.4-17.9% (air-conditioning for 6 months with RH = 85% and t =
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28

Kateryna, Maiorova, Vorobiov Iurii, Andrieiev Oleksii, Lupkin Borys, and Sikulskiy Valeriy. "Forming the geometric accuracy and roughness of holes when drilling aircraft structures made from polymeric composite materials." Eastern-European Journal of Enterprise Technologies 2, no. 1 (116) (2022): 71–80. https://doi.org/10.15587/1729-4061.2022.254555.

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The subject of this study is indicators of the quality, geometric accuracy, and roughness of holes in aviation structures (AS) made from polymeric composite materials (PCM) produced by drilling. The indicators of quality, geometric accuracy, and roughness of PCM holes were investigated by using kinematic hole drilling schemes and the creation of PCM chips. A kinematic scheme has been built of the cutting forces operating in PCM when drilling with the distribution of zones from 0° to 360°. Experimental studies on the establishment of characteristic shrinkage zones in the drilling of PCM
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29

Cao, Shou Qi, Shu Man Fu, Ya Wen Zhu, and Yan Ling Han. "Finite Element Method Analysis for Marine Semi-Built-Up Crankshaft Shrinkage Fitting." Applied Mechanics and Materials 472 (January 2014): 693–98. http://dx.doi.org/10.4028/www.scientific.net/amm.472.693.

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Based on the theories of induction heating and thermal conductivity, and by establishing a three-dimensional finite element analysis model including the induction coil, crank cheek and air, the pattern of temperatures field distribution and thermal deformation condition of the crank cheek during the period of induction heating were numerically simulated with software ANSYS. The simulation result showed that, by setting a circular coil inside the crank cheek, a uniform temperatures field around the hole would be obtained after a certain period of induction heating. As a result, the crankshaft w
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Fu, Shu Man, Zi Yue Wu, and Shou Qi Cao. "Finite Element Method Simulation of Induction Heating for a Large Marine Crankshaft." Advanced Materials Research 753-755 (August 2013): 1035–39. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.1035.

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Shrink fit is an important method used to connect mechanical parts but less studied by three-dimensional finite element method. Based on the theories of induction heating and thermal conductivity, we established a three-dimensional FEM. The model included the induction coil, crank throw and air. The pattern of temperature field distribution during the period of induction heating were numerically simulated with software ANSYS .The simulation showed that, crank throw can obtain a uniform temperature field around the hole after induction heating .As a result, the crankshaft reaches a highquality
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Xia, Jianbo, Yong Cheng, Mingliang Zhao, Cong Liu, and Yiming Wen. "Study on Mining Technology of Shallow Hole + Deep Hole Shrinkage method with Ductule Grouting in Advance for Roof Reinforcement." IOP Conference Series: Earth and Environmental Science 295 (July 25, 2019): 042123. http://dx.doi.org/10.1088/1755-1315/295/4/042123.

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32

Carpenter, Chris. "Testing and Evaluation Method Investigates Cement Expansion in Cased-Hole Wells." Journal of Petroleum Technology 74, no. 05 (2022): 96–98. http://dx.doi.org/10.2118/0522-0096-jpt.

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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 208679, “Cement Expansion in Cased-Hole Environments: A Novel Laboratory Testing and Evaluation Method With Successful Field Implementation,” by Vasilii Sukhachev, Amir Salehpour, SPE, and Ilshat Akhmetzianov, SPE, Schlumberger, et al. The paper has not been peer reviewed. Preventing bulk shrinkage of cement in cased-hole wells is important when dealing with the risk of sustained casing pressure (SCP). Current studies based on membrane tests suggest that, even with a high-percentage content of expa
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33

Li, Sheng, and Xilin Lü. "Analysis of hole wall stability in saturated clay using undrained solution for cylindrical cavity contraction." IOP Conference Series: Earth and Environmental Science 1332, no. 1 (2024): 012029. http://dx.doi.org/10.1088/1755-1315/1332/1/012029.

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Abstract To investigate the stress state of soil during the instability of the hole wall (hole shrinkage) in saturated clay, the theory of cylindrical cavity contraction in an infinite medium is applied, utilizing the modified Cam-Clay (MCC) model. By employing intermediate variables, the issue of cylindrical cavity contraction is reformulated into a first-order ordinary differential equation in Lagrangian form, with three effective stress components and pore pressure as the unknowns. In MATLAB, the stress conditions at the elastoplastic boundary serve as the initial values for solving the ini
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34

Chen, Wen-Cong, and Philipp Podsiadlowski. "Fast Orbital Shrinkage of Black Hole X-Ray Binaries Driven by Circumbinary Disks." Astrophysical Journal 876, no. 1 (2019): L11. http://dx.doi.org/10.3847/2041-8213/ab1b44.

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35

Sydor, Maciej, Jerzy Majka, Michał Rychlik, and Wojciech Turbański. "Application of 3D Scanning Method to Assess Mounting Holes’ Shape Instability of Pinewood." Materials 16, no. 5 (2023): 2053. http://dx.doi.org/10.3390/ma16052053.

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Swelling and shrinkage anisotropy affect the susceptibility to an assembly of wooden elements by changing designed clearances or interference fits. This work described the new method to measure mounting holes’ moisture-induced shape instability and its verification using three sets of twin samples made of Scots pinewood. Each set of samples contained a pair with different grain patterns. All samples were conditioned under reference conditions (relative air humidity–RH = 60% and temperature 20 °C), and their moisture content (MC) reached equilibrium (10.7 ± 0.1%). On the side of each sample, th
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36

Verma, Vinod, Sandeep Phogat, and Sanjeev Sharma. "Reduction Of Blow Hole Formation In Die Casting And Enhancement Of Strength Of Casting." International Journal of Engineering and Computer Science 12, no. 04 (2023): 25706–16. http://dx.doi.org/10.18535/ijecs/v12i04.4705.

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In automotive and other manufacturing industries making light weight part with corrosion resistance was the challenges. Looking at these challenges, casting part is the best replacement which can fulfil both the requirements corrosion resistance and light weight. Minimizing the operational cost is the today’s requirement .High pressure die casting process is the best solution, multicavity die can be used to produce the components with in few seconds. In HDPC there is inherent characteristics of porosity or voids or shrinkage porosity these casting defects can be managed and controlled but it c
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37

Lin, Bin. "Effect of CeO2/Ag2O on Etching Ratio and Crystallization Shrinkage of Photosensitive Glass-Ceramics." Materials Plus 2, no. 1 (2023): 1–6. http://dx.doi.org/10.37256/mp.2120233017.

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Based on Li2O-Al2O3-SiO2 system, photosensitive glass-ceramics with different CeO2/Ag2O ratios were prepared using the melting method. To improve the yield of through-hole processing in photosensitive glass-ceramics and the service life of Micro Electro Mechanical systems (MEMS), the effect of CeO2 content on the transmittance of various samples before and after UV exposure was examined. Additionally, the effect of CeO2/Ag2O ratio on the crystallization shrinkage and etching performance of photosensitive microcrystalline glass was studied both before and after heat treatment. The research resu
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Spurzem, R., P. Berczik, I. Berentzen, D. Merritt, M. Preto, and P. Amaro-Seoane. "Formation and Evolution of Black Holes in Galactic Nuclei and Star Clusters." Proceedings of the International Astronomical Union 3, S246 (2007): 346–50. http://dx.doi.org/10.1017/s1743921308015901.

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AbstractWe study the formation, growth, and co-evolution of single and multiple supermassive black holes (SMBHs) and compact objects like neutron stars, white dwarfs, and stellar mass black holes in galactic nuclei and star clusters, focusing on the role of stellar dynamics. In this paper we focus on one exemplary topic out of a wider range of work done, the study of orbital parameters of binary black holes in galactic nuclei (binding energy, eccentricity, relativistic coalescence) as a function of initial parameters. In some cases the classical evolution of black hole binaries in dense stella
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Orr, J. F., and N. J. Dunne. "Measurement of Shrinkage Stresses in PMMA Bone Cement." Applied Mechanics and Materials 1-2 (September 2004): 127–32. http://dx.doi.org/10.4028/www.scientific.net/amm.1-2.127.

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Polymethyl methacrylate (PMMA) bone cement comprises liquid methyl methacrylate monomer and PMMA beads, the former encapsulating the beads and polymerising within 10 minutes of mixing. Up to 7% volumetric shrinkage accompanies the exothermic polymerisation reaction and subsequent cooling induces residual thermal stresses when the cement is restrained around implant components. The authors have measured shrinkages, calculated residual stresses by closed form solutions and measured stresses by a range of methods. Full field optical displacement measurement has been used to derive strains and str
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Julian, Moh Rofi, and Yopi Handoyo. "ANALISIS PENGARUH VARIASI MATERIAL CORE TERHADAP KUALITAS NIPPLE." JURNAL ILMIAH TEKNIK MESIN 8, no. 2 (2020): 82–88. http://dx.doi.org/10.33558/jitm.v8i2.2186.

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This study aims to determine the effect of variations in core material made of iron and resin sand on the Nepel Brass smelter on hardness, surface results of castings, shrinkage, density apparent, time, and cost. To find out which core material is more efficient for use in large quantities. The product material used is Brass in the form of Hose Nipple with a size of 1/5 x 5/8 inch. The average specimen weight in this study was 8.33 gr. From the research conducted, the differences were found, namely the hardness of the smelting process with the core material of iron castings and resin sand is 3
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Sun, Zhongguang, Xuelong Li, Kequan Wang, Fakai Wang, Deyou Chen, and Zhen Li. "Determination of Key Technical Parameters in the Study of New Pressure Sealing Technology for Coal Seam Gas Extraction." International Journal of Environmental Research and Public Health 19, no. 9 (2022): 4968. http://dx.doi.org/10.3390/ijerph19094968.

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Coal is affected by the concentrated stress disturbance of mining, the disturbance of drilling hole formation, and the concentrated stress of coal shrinkage and splitting of gas desorption from the hole wall; these result in a large number of secondary cracks that collect and leak gas. As a result, it is difficult for the coal seam sealing process to meet engineering quality sealing requirements, which results in problems such as low gas concentration during the extraction process. In this paper, based on the analysis of coal pore and fissure characteristics, and in view of the current situati
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42

Yamamoto, Shigehisa, Yukiyasu Nakao, Nobuyuki Tomita, Shuhei Nakata, and Satoshi Yamakawa. "Development of 3.3 kV SiC-MOSFET: Suppression of Forward Voltage Degradation of the Body Diode." Materials Science Forum 778-780 (February 2014): 951–54. http://dx.doi.org/10.4028/www.scientific.net/msf.778-780.951.

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In order to achieve cost reduction or shrinkage of power devices, an internal body diode, which forms in a MOSFET parasitically, can be designed as a free-wheeling diode in substitution for an external Schottky barrier diode (SBD). However, in a SiC p-i-n diode, forward current stress causes reliability degradation due to expansion of the electron-hole recombination-induced stacking faults. Applying the process optimization of the epitaxial layer for the reduction of recombination-induced stacking faults and the body diode screening method to 3.3 kV SiC-MOSFETs, we obtained more stable devices
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Hempel, Nico, Thomas Nitschke-Pagel, and Klaus Dilger. "Residual Stresses in Multi-Pass Butt-Welded Tubular Joints." Advanced Materials Research 996 (August 2014): 488–93. http://dx.doi.org/10.4028/www.scientific.net/amr.996.488.

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In this study, the mechanics of the residual stress development in multi-pass butt-welded joints of ferritic-pearlitic steel pipes are investigated. Therefore, the effects of the welding process and its parameters, as well as the impact of the preheating temperature on the residual stress state are studied by determining the temperature profile during welding and performing X-ray diffraction measurements on the pipes inner and outer surfaces. Additionally, residual stress depth distributions are determined using the incremental hole-drilling method. The residual stress distributions can be exp
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Xu, Xiao-Tian, and Xiang-Dong Li. "A Circumbinary Disk Model for the Rapid Orbital Shrinkage in Black Hole Low-mass X-Ray Binaries." Astrophysical Journal 859, no. 1 (2018): 46. http://dx.doi.org/10.3847/1538-4357/aabe91.

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Liu, Hongguang, Hélène Birembaux, Yessine Ayed, Frédéric Rossi, and Gérard Poulachon. "A hybrid modelling approach for characterizing hole shrinkage mechanisms in drilling Ti6Al4V under dry and cryogenic conditions." International Journal of Advanced Manufacturing Technology 118, no. 11-12 (2021): 3849–68. http://dx.doi.org/10.1007/s00170-021-08229-2.

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Lim, Chae-Jun, Min-A. Kang, and Min-Young Lyu. "Mold Shrinkage of PPS Resin According to Injection Molding Condition for the Rectangular Specimen with Rectangular Hole." Polymer Korea 47, no. 5 (2023): 686–94. http://dx.doi.org/10.7317/pk.2023.47.5.686.

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Tang, Jin Jun, Cui Liang, and Chen Guang Xu. "Effect of Pore Defect Size and Location on Damage Tolerance of Aluminum Alloy Piston and Fiber Ring Groove." Materials Science Forum 1053 (February 17, 2022): 205–11. http://dx.doi.org/10.4028/p-tm5h6i.

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The defects of high-power density piston aluminum alloy components involved in this paper include surface crack, internal crack, shrinkage cavity and cold shut. The service condition of piston components is 350°C-420°C, and the explosion pressure of piston crown is 28Mpa. The requirements for eddy current flaw detection of this component are in accordance with a and requirements in GB / T5126-2013 eddy current flaw detection standard, that is, it is not allowed to be greater than 0.12mm × 0.2mm × 3mm volumetric defects, and Ф1.0mm flat bottom hole equivalent point defect. For the piston compon
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Feng, Chen, Shiyuan Liu, Junjie Li, et al. "Molecular Understanding of Electrochemical–Mechanical Responses in Carbon-Coated Silicon Nanotubes during Lithiation." Nanomaterials 11, no. 3 (2021): 564. http://dx.doi.org/10.3390/nano11030564.

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Carbon-coated silicon nanotube (SiNT@CNT) anodes show tremendous potential in high-performance lithium ion batteries (LIBs). Unfortunately, to realize the commercial application, it is still required to further optimize the structural design for better durability and safety. Here, the electrochemical and mechanical evolution in lithiated SiNT@CNT nanohybrids are investigated using large-scale atomistic simulations. More importantly, the lithiation responses of SiNW@CNT nanohybrids are also investigated in the same simulation conditions as references. The simulations quantitatively reveal that
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Wang, Fei Fei, Yan Wei Sui, Yao Jian Ren, Xin Zhao, and Zhi Sun. "Defects Analysis and Improvement for Electricmotorcar Aluminum Alloy Wheel by Gravity Casting." Advanced Materials Research 189-193 (February 2011): 3880–85. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.3880.

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Analysis the electricmotorcar aluminum wheels’ hole defect on macroscopic and microscopic, observed that the main defects、concentrated site and the main alloy phase. Combined with the local casting technological parameters, the filling and solidification process of aluminium alloy hub was simulated by using Anycasting software. The results showed that: castings filling smoothly, at the junction of the spoke and the rim and the hub central are easy to produce casting defects. Using the optimized process parameters that is lower pouring temperature, higher pouring height and set the vent to expe
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Zhao, Zhuoran, Jun Zhu, Yi Xu, and Xingyun Geng. "Using Radiomic Features to Predict Visual Prognosis of Idiopathic Macular Hole Surgery." Journal of Medical Imaging and Health Informatics 10, no. 11 (2020): 2773–77. http://dx.doi.org/10.1166/jmihi.2020.3214.

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Idiopathic macular holes (IMH) are a leading cause of vision loss in middle-aged and older people. IMH is usually treated surgically by vitrectomy. Improvement in visual acuity is used to assess the prognosis of macular hole surgery. To achieve better diagnosis and treatment of IMH, Optical coherence tomography (OCT) technology is widely used. It will improve patient outcomes if parameters that are correlated with favorable prognoses are identified in OCT images. Both 2D OCT images and 3D OCT images can be obtained, which allows for the possibility of extracting 3D features. We propose the use
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