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Journal Article 62

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Hole quality in longitudinal–torsional coupled ultrasonic vibration assisted drilling of carbon fiber

Guofeng MA, Renke KANG, Zhigang DONG, Sen YIN, Yan BAO, Dongming GUO

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 4, Pages 538-546 doi: 10.1007/s11465-020-0598-y

Abstract: characteristics, CFRP composites are considered difficult-to-cut materials and are prone to generating serious holea potential application for drilling CFRP composites.At present, LTC-UAD is mainly adopted for drilling metal materials and rarely for CFRP.Furthermore, LTC-UAD can decrease the delamination and burr factors and improve the surface quality of the holeThus, LTC-UAD is an applicable process method for drilling components made with CFRP composites.

Keywords： longitudinal–torsional coupled ultrasonically drilling CFRP thrust force hole quality

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Experimental investigation of multiphase flow behavior in drilling annuli using high speed visualization

Alap Ali ZAHID, Syed Raza ur REHMAN, Anwarul HASAN, S. RUSHD, Mohammad Azizur RAHMAN

Frontiers in Energy 2020, Volume 14, Issue 3, Pages 635-643 doi: 10.1007/s11708-018-0582-y

Abstract: Imaging with high definition video camera is an important technique to visualize the drilling conditionsand to study the physics of complex multiphase flow associated with the hole cleaning process.The main advantage of visualizing multiphase flow in a drilling annulus is that the viewer can easilyIn this paper the hole cleaning process which involves the transportation of cuttings through a horizontalthis paper has a direct application in investigating the critical conditions required for efficient hole

Keywords： visualization horizontal annulus hole cleaning multiphase flow image analysis flow regime

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Study on Blasting at Ever-frost Ground in Qinghai-Tibet Plateau

He Guangyi

Strategic Study of CAE 2001, Volume 3, Issue 6, Pages 57-64

Abstract:

The paper introduces the research achievements on blasting while the writer participated the railway experimental engineering projects in ever-frost ground in Qinghai-Tibet Plateau in seventies. It describes the blasting methods and technology, and practicable cumulative blasting technology according to the features of ever-frost ground.

Keywords： ever-frost ground cutting foundation pit drilling hole cumulative shell cumulative blasting

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Investigation on drilling-grinding of CFRP

Yanming QUAN, Wenwang ZHONG

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1, Pages 60-63 doi: 10.1007/s11465-009-0008-y

Abstract: It is difficult to machine polymer matrix composites reinforced by carbon fibre, and the hole-makingConventional drills have a very short life in the drilling of this kind of composites and the qualityof the hole is very poor.The effects of machining parameters, cooling and chip removal on the tool life, and the hole qualitymechanism of the two kinds of diamond tools is not like the cutting effect of the conventional solid twist drilling

Keywords： composites drilling-grinding cemented/plated diamond tool life machined quality

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Improving hole transfer of boron nitride quantum dots modified PDI for efficient photodegradation

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 11, Pages 1718-1727 doi: 10.1007/s11705-023-2319-7

Abstract: In recent years, organic photocatalyst under visible-light absorption has shown significant potential for solving environmental problems. However, it is still a great challenge for constructing a highly active organic photocatalyst due to the low separation efficiency of photogenerated carriers. Herein, an effective and robust photocatalyst perylene-3,4,9,10-tetracarboxylic diamide/boron nitride quantum dots (PDI/BNQDs), consisting of self-assemble PDI with π–π stacking structure and BNQDs, has been constructed and researched under visible light irradiation. The PDI/BNQDs composite gradually increases organic pollutant photodegradation with the loading amount of BNQDs. With 10 mL of BNQDs solution added (PDI/BNQDs-10), the organic pollutant photodegradation performance reaches a maximum, about 6.16 times higher with methylene blue and 1.68 times higher with ciprofloxacin than that of pure PDI supramolecular. The enhancement is attributed to improved separation of photogenerated carriers from self-assembled PDI by BNQDs due to their preeminent ability to extract holes. This work is significant for the supplement of PDI supramolecular composite materials. We believe that this photocatalytic design is capable of expanding organic semiconductors’ potential for their applications in photocatalysis.

Keywords： PDI boron nitride quantum dots photocatalysis hole transfer

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Calculation and research on deepwater drilling riser flexural equation and natural frequency

Jiang Wei

Strategic Study of CAE 2011, Volume 13, Issue 5, Pages 66-73

Abstract: justify;">Flexural equation was established in this paper, which was based on application of deepwater drillingTherefore, simple calculation method for natural frequency of drilling riser was achieved.Free-hinged beam was taken as constraint condition of flexural equation combined with drilling stringPurpose of research was to provide reasonable design and selection for deepwater drilling riser, andprovide a more efficient and applied method, which would show guiding significance for deepwater drilling

Keywords： deepwater drilling drilling riser flexural equation natural frequency shape function

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The optimum drilling technique in the northeast area of Sichuan

Han Laiju,Ma Guangjun,Zhao Jinhai

Strategic Study of CAE 2010, Volume 12, Issue 10, Pages 44-49

Abstract: complicated, which causes many complex cases and accidents like lost circulation and collapse when drillingROP was slow and drilling cycle was long.deepwell in south China, through introducing and developing new technology and new tools, like gas drillingand vertical drilling equipments, combined with existing techniques such as underbalanced drilling,compound drilling, optimum drilling technique system fit for complicated deepwell in northeast area of

Keywords： northeast area of Sichuan optimum drilling gas drilling vertical drilling MPD with lower-densitydrilling fluid bit optimization compound drilling

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Fracture behavior of two non-symmetrical collinear cracks emanating from an elliptical hole in a piezoelectric

Junhong GUO, Zixing LU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3, Pages 296-300 doi: 10.1007/s11465-011-0236-9

Abstract: conformal mapping, the problem of two non-symmetrical collinear cracks emanating from an elliptical holeelectric loading and anti-plane mechanical loading, which allowed us to take the electric field inside the hole

Keywords： piezoelectric materials elliptical hole semi-permeable crack energy release rate analytic solution

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The influence of hand hole on the ultimate strength and crack pattern of shield tunnel segment joints

Shaochun WANG, Xi JIANG, Yun BAI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5, Pages 1200-1213 doi: 10.1007/s11709-019-0546-2

Abstract: The hand hole acts as a weak point and initial damage in the segment joint especially when the circumferentialThe experiment results show that the hand hole becomes the weakest point of the segment joint under ultra-highDifferent types and sizes of the hand hole have different degree of influences on the structural behavior

Keywords： shield tunneling structural synthetic fiber concrete hand hole segment joint ultimate bearing capacity

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characteristic evaluation and interpolation reconstruction for surface topography of drilled composite hole

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 4, Pages 840-854 doi: 10.1007/s11465-021-0643-5

Abstract: improved fractal interpolation model is proposed to reconstruct the surface topography of composite holeHole profiles in 24 directions are measured.The maximum and minimum fractal dimension of the hole wall are 1.36 and 1.07, whereas the maximum and

Keywords： surface topography fractal evaluation fractal interpolation reconstruction composite

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Development Path of Offshore Drilling Equipment in China

Liu Jian

Strategic Study of CAE 2020, Volume 22, Issue 6, Pages 40-48 doi: 10.15302/J-SSCAE-2020.06.006

Abstract:

China has made achievements in offshore drilling equipment, and it cannow develop the shallow-water drilling rigs independently.However, as far as deep-water drilling equipment is concerned, there still exists a big gap between ChinaTo accelerate the development of China’s offshore drilling equipment, this study first analyzesmachine, deep-water drilling machine, and new-type marine drilling machine; it then summarizes the development

Keywords： offshore drilling rig deep-water drilling rig development of equipment test sea test

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Effects of Structure of Opening Hole in Gas Distributor on Detained Mass of Material for Fluidized Drying

Liu Wei,Tang Wencheng

Strategic Study of CAE 2006, Volume 8, Issue 6, Pages 41-43

Abstract: In order to acquire the effect law of structure of opening hole in gas distributor on detained mass ofThe curves of detained mass of material for drier with vertical-hole distributor and tithed-hole distributorBased on the result, the relationship data of drier with tilted-hole distributor were determined betweenthe production capacity and the hole ratio of distributor.In addition, changing the hole shape of distributor from vertical-hole to tilted-hole and adding the

Keywords： inert particles fluidized drying gas distributor hole shape hole ratio detained mass of material

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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 involvingeffect of mode delamination and corresponding interlaminar crack propagation was considered during the drilling

Keywords： delamination VCCT ARCAN specimen drilling mode II

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Permeability testing of drilling core sample from pavement

WANG Suda, TANG Zhengguang, NING Xiaojun, WU Peiguan, XING Pingyi

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 4, Pages 391-394 doi: 10.1007/s11709-008-0045-3

Abstract: New equipment is used to measure the permeability coefficient of the pavement drilling core sample andTesting drilling core samples from a certain highway of Yunnan province has been proven to be feasible

Keywords： province material feasible permeability coefficient equipment

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Inspiring China’s oil drilling——60-year microcosm of China oil drilling

Sun Zhenchun,Wang Haige,Cui Longlian

Strategic Study of CAE 2010, Volume 12, Issue 5, Pages 91-96

Abstract: workload, footage and drilling team was shown.The tremendous progresses of China's drilling technology, including directional well drilling, horizontalwell drilling, underbalanced and gas drilling, deep well drilling, drilling equipment and well controlDrilling experience, scientific drilling, drilling optimization described the evolution developing processof China's drilling technology.

Keywords： China’s oil drilling developing process technology progress great achievement developing trend