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Analysis of stress and failure in rock specimens with closed and open flaws on the surface

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5,   Pages 1222-1237 doi: 10.1007/s11709-021-0773-1

Abstract: The influence of closed and open surface flaws on the stress distribution and failure in rock specimens is investigated. Heterogeneous finite element models are developed to simulate the compression tests on flawed rock specimens. The simulated specimens include those with closed flaws and those with open flaws on the surface. Systematic analyses are conducted to investigate the influences of the flaw inclination, friction coefficient and the confining stress on failure behavior. Numerical results show significant differences in the stress, displacement, and failure behavior of the closed and open flaws when they are subjected to pure compression; however, their behaviors under shear and tensile loads are similar. According to the results, when compression is the dominant mode of stress applied to the flaw surface, an open flaw may play a destressing role in the rock and relocate the stress concentration and failure zones. The presented results in this article suggest that failure at the rock surface may be managed in a favorable manner by fabricating open flaws on the rock surface. The insights gained from this research can be helpful in managing failure at the boundaries of rock structures.

Keywords： surface flaw     heterogeneity     circular hole     numerical modeling     relative displacement    

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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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LEVERAGING LIVESTOCK TO PROMOTE A CIRCULAR FOOD SYSTEM

Zhengxia DOU

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,   Pages 188-192 doi: 10.15302/J-FASE-2020370

Abstract: animal-derived food is slowing while attention is growing over the role of livestock farming in an enhanced circular
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Study on Blasting Fragmentation Control for Moderate Deep Hole in Underground Mine

Zhao Yanwei,He Dongmei,Li Xianglong,Liu Junxuan

Strategic Study of CAE 2014, Volume 16, Issue 11,   Pages 48-52

Abstract: In order to realize the mine production efficient development, the circular moderate longhole blastingThe test results show that circular hole blasting can reduce the block rate is reduced to 10.3%, and

Keywords： The scallop moderate longhole blasting     the circular moderate longhole blasting     lump ore     blasting effect    

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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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LEVERAGING LIVESTOCK TO PROMOTE A CIRCULAR FOOD SYSTEM

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,

Abstract: animal-derived food is slowing while attention is growing over the role of livestock farming in an enhanced circular
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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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Circular economy：ideas and innovation

Jin Yong,Feng Zhijun,Chen Dingjiang

Strategic Study of CAE 2010, Volume 12, Issue 1,   Pages 4-11

Abstract: "text-align: justify;">It has been over a decade since China paid close attention to the concept of circularDuring this period the country made promoting circular economy as one of the basic national developmentimportant ideas and theories, which could be used as general guidelines for innovation to boost the circular

Keywords： circular economy     circular economics    

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Frequencies of circular plate with concentric ring and elastic edge support

Lokavarapu Bhaskara RAO,Chellapilla Kameswara RAO

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 2,   Pages 168-176 doi: 10.1007/s11465-014-0299-5

Abstract:

Exact solutions for the flexural vibrations of circular plates having elastic edge conditions alongValues of frequency parameter for the considered circular plate are computed for different sets of valuesrotational and linear restraints and the radius of the rigid ring support on the vibration behavior of circular

Keywords： circular plate     frequency     elastic edge     rigid ring     mode switching    

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Numerical analysis of hydrodynamic process of circular-translational-moving polishing (CTMP)

ZHAI Wenjie, LIU Changxiong, LIANG Yingchun

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 441-448 doi: 10.1007/s11465-008-0074-6

Abstract: By keeping a pad moving relative to a wafer along a circular path without rotation, we developed a polishingtechnique called circular-translational-moving polishing (CTMP), which permits multidirectional polishing

Keywords： numerical analysis     practical CTMP     circular-translational-moving polishing     CTMP     different    

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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 holeFurthermore, LTC-UAD can decrease the delamination and burr factors and improve the surface quality of the hole

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

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A new method for boring of non-circular holes

ZHANG Kai, HU De-jin

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 4,   Pages 456-460 doi: 10.1007/s11465-006-0058-3

Abstract: composed of an electromagnetic stator and an electromagnetic rotor has been developed for boring non-circular

Keywords： electromagnetic actuation     control method     displacement     flexible body     revolving electromagnetic    

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Fundamental buckling of circular plates with elastically restrained edges and resting on concentric rigid

Lokavarapu Bhaskara Rao, Chellapilla Kameswara Rao

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 3,   Pages 291-297 doi: 10.1007/s11465-013-0255-9

Abstract:

This work presents the existence of buckling mode switching with respect to the radius of concentric rigid ring support. The buckling mode may not be axisymmetric as previously assumed. In general, the plate may buckle in an axisymmetric mode but when the radius of the ring support becomes small, the plate may buckle in an asymmetric mode. The optimum radius of the concentric rigid ring support for maximum buckling load is also determined. Introducing internal rigid ring support, when placed at an optimal position increases the elastic buckling load capacity by 149.39 percent. The numerical results obtained are in good agreement with the previously published data.

Keywords： buckling     circular plate     elastically restrained edge     rigid ring support     mode switching    

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Title Author Date Type Operation

Analysis of stress and failure in rock specimens with closed and open flaws on the surface

Journal Article

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

Journal Article

LEVERAGING LIVESTOCK TO PROMOTE A CIRCULAR FOOD SYSTEM

Zhengxia DOU

Journal Article

Study on Blasting Fragmentation Control for Moderate Deep Hole in Underground Mine

Zhao Yanwei,He Dongmei,Li Xianglong,Liu Junxuan

Journal Article

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

Junhong GUO, Zixing LU

Journal Article

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

Shaochun WANG, Xi JIANG, Yun BAI

Journal Article

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

Journal Article

LEVERAGING LIVESTOCK TO PROMOTE A CIRCULAR FOOD SYSTEM

Journal Article

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

Liu Wei,Tang Wencheng

Journal Article

Circular economy：ideas and innovation

Jin Yong,Feng Zhijun,Chen Dingjiang

Journal Article

Frequencies of circular plate with concentric ring and elastic edge support

Lokavarapu Bhaskara RAO,Chellapilla Kameswara RAO

Journal Article

Numerical analysis of hydrodynamic process of circular-translational-moving polishing (CTMP)

ZHAI Wenjie, LIU Changxiong, LIANG Yingchun

Journal Article

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

Journal Article

A new method for boring of non-circular holes

ZHANG Kai, HU De-jin

Journal Article

Fundamental buckling of circular plates with elastically restrained edges and resting on concentric rigid

Lokavarapu Bhaskara Rao, Chellapilla Kameswara Rao

Journal Article