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Artículos de revistas sobre el tema "Joint roughness number"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 17 de febrero de 2022

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1

Yong, Rui, Leiyu Gu, Jun Ye, et al. "Neutrosophic Function with NNs for Analyzing and Expressing Anisotropy Characteristic and Scale Effect of Joint Surface Roughness." Mathematical Problems in Engineering 2019 (April 14, 2019): 1–11. http://dx.doi.org/10.1155/2019/8718936.

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The shear behavior of rock mass significantly depends upon the surface roughness of rock joints which is generally characterized by the anisotropy characteristic and the scale effect. The large-scale natural rock joint surfaces, at Qingshi Town, southeast of Changshan County, Zhejiang Province, China, were used as a case study to analyze the roughness characteristics. A statistical assessment of joint roughness coefficient (JRC) indicated the roughness anisotropy of different sized rock joints. The lower limit (JRCmean-σ) was regarded as the determinate information, and the difference between

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2

Cao, Congcong, Keke Zhang, Baojin Shi, et al. "The Interface Microstructure and Shear Strength of Sn2.5Ag0.7Cu0.1RExNi/Cu Solder Joints under Thermal-Cycle Loading." Metals 9, no. 5 (2019): 518. http://dx.doi.org/10.3390/met9050518.

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The interface microstructure and shear strength of Sn2.5Ag0.7Cu0.1RExNi/Cu solder joints under thermal-cycle loading were investigated with scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and physical and chemical tests. The results show that an intermetallic compound (IMC) layer of Sn2.5Ag0.7Cu0.1RExNi/Cu solder joints evolved gradually from the scalloped into larger wavy forms with increasing number of thermal cycles. The roughness and average thickness of IMC increased with thermal-cycle loading. However, at longer thermal-cycle loading, the

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3

Ye, Jun, Jiqian Chen, Rui Yong, and Shigui Du. "Expression and Analysis of Joint Roughness Coefficient Using Neutrosophic Number Functions." Information 8, no. 2 (2017): 69. http://dx.doi.org/10.3390/info8020069.

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4

XIE, HEPING, WEIHONG XIE, and PENG ZHAO. "PHOTOELASTIC STUDY ON THE MECHANICAL PROPERTIES OF FRACTAL ROCK JOINTS." Fractals 04, no. 04 (1996): 521–31. http://dx.doi.org/10.1142/s0218348x96000637.

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In this paper, the fractal rock joints are manufactured on the photoelastic material plate. Based on the visualized photoelastic experiments, the mechanical properties of the fractal joints with different roughness (different fractal dimensions) are investigated under uniaxial and shear compression. The research results indicate that the joint roughness (the fractal dimension of the joints) significantly influences the peak shear strength, the position of the maximum shear stress, and the number of contact points.

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5

Yong, Rui, Shaonan Tan, Jun Ye, and Shigui Du. "Neutrosophic Function for Assessing the Scale Effect of the Rock Joint Surface Roughness." Mathematical Problems in Engineering 2021 (July 3, 2021): 1–11. http://dx.doi.org/10.1155/2021/6611627.

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A new investigation method is proposed for recording large-sized joint profiles and making statistical analyses of the joint roughness coefficient (JRC) values of the 10–300 cm sized profiles. The mechanical hand profilograph is used for joint roughness measurement due to its advantage of easy operation and high accuracy in recording joint traces. Based on the proposed method, it provides sufficient samples from various positions on the large joint profile, which allows the statistical evaluation of JRC values. A neutrosophic number (NN) is employed for revealing determinate and/or indetermina

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6

Lin, Hang, Jianxin Qin, Yixian Wang, and Yifan Chen. "Determination of Joint Surface Roughness Based on 3D Statistical Morphology Characteristic." Advances in Civil Engineering 2021 (September 3, 2021): 1–12. http://dx.doi.org/10.1155/2021/8813409.

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Roughness significantly affects the shear behavior of rock joints, which are widely encountered in geotechnical engineering. Since the existing calculation methods on the joint roughness coefficient (JRC) fail to obtain a sufficiently accurate value of JRC, a new determination method was proposed in this study, where the 3D laser scanning technique and self-compiled Python code, as well as the statistical parameter methods, were applied. Then, the shear strength of jointed rock was evaluated via Barton's model, and therefore, a comprehensive comparison between the calculating results and exper

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7

Choopani, Yahya, Mohsen Khajehzadeh, and Mohammad Reza Razfar. "Optimal parameters of abrasive flow finishing for hip joint implants." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 235, no. 11 (2021): 1818–31. http://dx.doi.org/10.1177/0954405421995614.

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Total hip arthroplasty (THA) is one of the most well-known orthopedic surgeries in the world which involves the substitution of the natural hip joint by prostheses. In this process, the surface roughness of the femoral head plays a pivotal role in the performance of hip joint implants. In this regard, the nano-finishing of the femoral head of the hip joint implants to achieve a uniform surface roughness with the lowest standard deviation is a major challenge in the conventional and advanced finishing processes. In the present study, the inverse replica fixture technique was used for automatic

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8

Mandolfino, Chiara, Enrico Lertora, and Carla Gambaro. "Effect of Surface Pretreatment on the Performance of Adhesive-Bonded Joints." Key Engineering Materials 554-557 (June 2013): 996–1006. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.996.

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This paper presents a systematic investigation of the influence of sandblasting pretreatment parameters on the surface roughness and mechanical characteristics of adhesive-bonded joints. The preliminary surface treatment in a bonding process has two important aims: first of all, it eliminates contaminants (dust, grease, humidity and corrosion products) which can modify the wettability of the substrate, then it increases surface roughness and, consequently, the contact area between substrate and adhesive, creating a mechanical interlocking that maximizes adhesion. To enhance the strength and av

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9

Baino, Francesco, Maria Angeles Montealegre, Joaquim Minguella-Canela, and Chiara Vitale-Brovarone. "Laser Surface Texturing of Alumina/Zirconia Composite Ceramics for Potential Use in Hip Joint Prosthesis." Coatings 9, no. 6 (2019): 369. http://dx.doi.org/10.3390/coatings9060369.

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The use of metal shell to fix an acetabular cup to bone in hip joint prosthesis carries some limitations, including restrictions in prosthetic femur ball diameter and in patient’s range of motion. These drawbacks could be ideally overcome by using a monolithic ceramic acetabular cup, but the fixation of such an implant to host bone still remains a challenge. Since porous surfaces are known to promote more bone tissue interlocking compared to smooth materials, in this work the surfaces of sintered alumina/zirconia composite ceramics were treated by a pulsed laser radiation at 1064 nm with a pul

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10

Lancaster, J. G., D. Dowson, G. H. Isaac, and J. Fisher. "The wear of ultra-high molecular weight polyethylene sliding on metallic and ceramic counterfaces representative of current femoral surfaces in joint replacement." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 211, no. 1 (1997): 17–24. http://dx.doi.org/10.1243/0954411971534647.

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A number of studies have investigated the influence of surface roughness on the wear of ultra-high molecular weight polyethylene (UHMWPE) in total joint replacement. The results of these studies have shown that the wear factor is proportional to the counterface roughness raised to a power greater than one. In this laboratory study, the effect of surface finish of several biomaterials on the wear of UHMWPE was studied. The study was conducted using reciprocating pin-on-plate wear tests with bovine serum as a lubricant. The biomaterials investigated as the counterface material included stainless

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11

Tayeh, Bassam A., B. H. Abu Bakar, and Megat Azmi Megat Johari. "Assessment of Adhesion between RPC Overlay and Existing Concrete Substrate." Applied Mechanics and Materials 802 (October 2015): 95–100. http://dx.doi.org/10.4028/www.scientific.net/amm.802.95.

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The number of existing structures under repair and rehabilitation has extensively increased over the past two decades; these structures typically require performance enhancements including durable and safe repair and strengthening. The experimental program aimed to investigate the bond strength at the joint surfaces between conventional concrete substrate as existing concrete and reactive powder concrete RPC as new overlay concrete. Pull off test was used to quantify the direct tension of the bond strength. Different surfaces roughness were used for existing concrete. The obtained results, cle

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12

Reza Borghei, Hamid, Bashir Behjat, and Mojtaba Yazdani. "The impact of graphene nanoparticle additives on the strength of simple and hybrid adhesively bonded joints." Journal of Composite Materials 53, no. 23 (2018): 3335–46. http://dx.doi.org/10.1177/0021998318817588.

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In this paper, the effect of graphene nanoparticle additive on the strength of simple and hybrid (rivet-bonded) single-lap joints is studied using the experimental method. Two different types of graphene with different number of layer and thicknesses are used in adhesive-graphene nanoparticle composite construction. At first, tensile tests are done on bulk specimens of adhesive with different additives. It is found that adding 0.5 wt% of graphene to the neat adhesive leads to an increase in the ultimate tensile strength of bulk specimens almost 24% and 12% for two graphene types compared to th

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13

Koike, Hitonobu, Katsuyuki Kida, Kenji Kanemasu, et al. "Influence of Wear and Backlash on Machined PEEK Polymer Bushes and 7075 Aluminium Alloy Cam Plates Used in Robot Joints." Applied Mechanics and Materials 157-158 (February 2012): 1178–85. http://dx.doi.org/10.4028/www.scientific.net/amm.157-158.1178.

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Due to constant exposure to high torque and loads toughness, compressive durability and light weight of joint parts are crucial factors for biped walking humanoid robot parts. When polymer transmission parts are used for the manufacture of humanoid robot joint, wear becomes an important factor in terms of transmission error (backlash) between the input and output axes, ex. between the motor and the robot’s leg joint. In such joint system, a polymer bushes is directly connected to a cam plate, playing an important role in the robot's movement ability. In this work, the influence of wear of rein

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14

Tikhomirov, Victor, and Mikhail Izmerov. "IMPACT OF CORRUGATION AND ROUGHNESS OF SURFACE UPON NORMAL CONTACT STIFFNESS OF FLAT JOINT." Bulletin of Bryansk state technical university 2019, no. 12 (2019): 4–12. http://dx.doi.org/10.30987/1999-8775-2019-2019-12-4-12.

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A contact stiffness of a flat join in engineering surfaces depends upon the presence of corrugation and roughness which are actually on any surface. An efficient method for the analysis of a contact interaction between wavy surfaces is a simulation: statistical methods for the estimate are unacceptable because of a small number of waves and the absence of a proper statistical distribution of their height, and a fractal model manifesting the peculiarities of rough layer structure and the presence of self-affinity is most suitable for the estimate of contact stiffness.  In this paper there

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15

Shirvani, Abootaleb. "Stock Returns and Roughness Extreme Variations: A New Model for Monitoring 2008 Market Crash and 2015 Flash Crash." Applied Economics and Finance 7, no. 3 (2020): 78. http://dx.doi.org/10.11114/aef.v7i3.4824.

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We use Student’s t-copula to study the extreme variations in the bivariate kinematic time series of log–return and log–roughness of the S&P 500 index during two market crashes, the financial crisis in 2008 and the flash crash on Monday August 24, 2015. The stable and small values of the tail dependence index observed for some months preceding the market crash of 2008 indicate that the joint distribution of daily return and roughness was close to a normal one. The volatility of the tail and degree of freedom indices as determined by Student’s t-copula falls down substantially after the stoc

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16

Ramírez-Martínez, Israel, Susanna Stea, and Thomas J. Joyce. "Analysis of the surface topography of retrieved metal-on-polyethylene reverse shoulder prostheses." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 234, no. 12 (2020): 1353–62. http://dx.doi.org/10.1177/0954411920935757.

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Despite the encouraging short- and medium-term clinical results and increased usage of reverse shoulder replacements, a higher revision rate is documented compared with other major joint arthroplasties. Adverse reaction to polyethylene wear debris is still an important factor which may influence the long-term survival of reverse shoulder arthroplasty. To date, only a small number of retrieval studies of reverse shoulder arthroplasty have reported the different damage modes on polyethylene components, but none have quantified the ex vivo surface roughness on both articulating surfaces. The main

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17

Nagdeve, Leeladhar, V. K. Jain, and J. Ramkumar. "Development of inverse replica fixture for nano-finishing of knee joint using R-MRAFF process." Journal of Micromanufacturing 2, no. 1 (2018): 35–41. http://dx.doi.org/10.1177/2516598418811460.

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Rotational-Magnetorheological Abrasive Flow Finishing (R-MRAFF) process is a technique of nano-finishing in general and free-form/sculptured surfaces in particular. Knee joint is one such example of free-form surface which is used by orthopedic surgeons. Knee joints are usually made of cobalt chromium alloy which is bio-compatible material, and it is difficult to finish. The present work deals with the development of an inverse replica for a knee joint. This inverse replica is used as a fixture so that the fluid can flow with constant velocity within the confined gap between the workpiece and

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18

WIERZCHOLSKI, Krzysztof. "SURFACE RANDOM PARAMETERS FOR ENDOPROSTHESIS LUBRICATION." Tribologia 265, no. 1 (2016): 117–27. http://dx.doi.org/10.5604/01.3001.0010.7593.

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Within the last ten years in the European Union the number of bone fractures caused by the osteoarthritis increased twofold. More than 100000 hip or knee joints in total have been implanted in Germany during one year. Within ten years, 5% of them have failed by aseptic loosening. The non-invasive determination of friction forces and the control of their values during lubrication of cartilage cells on the superficial layer of human joint surfaces before implantation have a significant but not sufficient influence on the observation of the early abrasive wear of cartilage joint and the developme

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19

Lysenko, V. I., S. A. Gaponov, B. V. Smorodsky, Yu G. Yermolaev, A. D. Kosinov, and N. V. Semionov. "Combined influence of coating permeability and roughness on supersonic boundary layer stability and transition." Journal of Fluid Mechanics 798 (June 9, 2016): 751–73. http://dx.doi.org/10.1017/jfm.2016.347.

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A joint theoretical and experimental investigation of the influence of the surface permeability and roughness on the stability and laminar–turbulent transition of a supersonic flat-plate boundary layer at a free-stream Mach number of $M_{\infty }=2$ has been performed. Good quantitative agreement of the experimental data obtained with artificially generated disturbances performed on models with various porous inserts and calculations based on linear stability theory has been achieved. An increase of the pore size and porous-coating thickness leads to a boundary layer destabilization that accel

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20

Li, Jinglong, Xianghui Li, Bo Zhang, Bin Sui, Pengcheng Wang, and Mi Zhang. "Effect of Lower Surface Roughness on Nonlinear Hydraulic Properties of Fractures." Geofluids 2021 (February 11, 2021): 1–9. http://dx.doi.org/10.1155/2021/6612378.

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This study investigates the effect of fracture lower surface roughness on the nonlinear flow behaviors of fluids through fractures when the aperture fields are fixed. The flow is modeled with hydraulic pressure drop = 10 − 4 ~ 10 5 Pa / m by solving the Navier-Stokes equations based on rough fracture models with lower surface roughness varying from JRC = 1 to JRC = 19 . Here, JRC represents joint roughness coefficient. The results show that the proposed numerical method is valid by comparisons between numerically calculated results with theoretical values of three parallel-plate models. With t

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21

Wierzcholski, Krzysztof. "Geometrical Structure for Endoprosthesis Surface Lubrication and Wear Prognosis." Solid State Phenomena 251 (July 2016): 206–11. http://dx.doi.org/10.4028/www.scientific.net/ssp.251.206.

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It can be stated that over the last ten years in the European Union, the number of bone fractures caused by osteoarthritis has increased twofold. More than 100,000 hip or knee joints in total were implanted in Germany during one year. Within ten years, 5% of them have failed by aseptic loosening.The non-invasive determination of friction forces and control of their values during lubrication of cartilage cells on the superficial layer of human joint surfaces before implantation has a significant but not sufficient impact on the observation of the early abrasive wear of the cartilage joint and d

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22

Theophanatos, A., and J. Wolfram. "Hydrodynamic Loading on Macro-Roughened Cylinders of Various Aspect Ratios." Journal of Offshore Mechanics and Arctic Engineering 111, no. 3 (1989): 214–22. http://dx.doi.org/10.1115/1.3257150.

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This paper describes experiments which comprise part of the UK joint SERC/industry-sponsored program on fluid loading. The experiments have been undertaken in a novel test rig which accelerates a cylinder from rest to a constant velocity in a still water tank and cover the Reynolds number range 105 to 106. Results are presented for 30 cylinders ranging in diameter from 150 mm to 400 mm. The test program comprised: (a) cylinders with different distributions of marine growth (mussels and kelp) and artificial roughness at low surface cover; (b) fully sand/gravel-roughened cylinders with aspect ra

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23

Li, Biao, Weiya Xu, Long Yan, Jianrong Xu, Mingjie He, and Wei-Chau Xie. "Effect of Shearing on Non-Darcian Fluid Flow Characteristics through Rough-Walled Fracture." Water 12, no. 11 (2020): 3260. http://dx.doi.org/10.3390/w12113260.

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The heterogeneous fracture geometry induced by the presence of roughness and shearing complicates the fracture flow. This paper presents a numerical investigation of the non-Darcian flow characteristics of rough-walled fractures during shear processes. A series of fracture flow simulations were performed on four types of fractures with different joint roughness coefficients (JRCs), and the different shear displacements were imitated by degrees of mismatch on two fracture surfaces. The results show that the disorder of fracture geometries and the increase in flow rate are the main causes for th

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24

Blumenstein, Valeriy, Andrey Krechetov, Maksim Mahalov, and Oleg Ostanin. "Dimensional Joint Running-in of Cylindrical Parts of Mining Machinery." E3S Web of Conferences 174 (2020): 03001. http://dx.doi.org/10.1051/e3sconf/202017403001.

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The current task of engineering is to ensure the quality and reliability of critical parts of an extended cylindrical shape. This task is especially relevant in the production of power hydraulics parts for mining equipment (ME). One of the ways to ensure the required quality of the surface layer (SL) of mining equipment parts is the use of combined and joint methods of parts hardening by surface plastic deformation (SPD). Combined methods present sequential machining in which the methods used are separated into different technological steps, while the joint machining is carried out by concentr

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25

А.А., Gaisin. "Commissioning experiment for joint physical and numerical analysis." Ekologiya i stroitelstvo 1 (2015): 4–7. http://dx.doi.org/10.35688/2413-8452-2015-01-001.

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This work is devoted to carrying out commissioning experiments to verify the acceptability of the mathematical model, computational grid and boundary conditions for numerical modeling of fluid flow in the hydrodynamic flow regulators. Verification of a numerical experiment was conducted using laboratory studies. The physical experiment was constructed in a reversed hydraulic tray. Measurements of local velocities in the outlet section of the diffuser was performed in the control points using utrirovannoe tube Prandtl-Pitot. Numerical simulation was performed in STAR-CMM+. The model is based on

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26

Gallardo‐Delgado, Luis A., Marco Antonio Pérez‐Flores, and Enrique Gómez‐Treviño. "A versatile algorithm for joint 3D inversion of gravity and magnetic data." GEOPHYSICS 68, no. 3 (2003): 949–59. http://dx.doi.org/10.1190/1.1581067.

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We describe the implementation of a versatile method for interpreting gravity and magnetic data in terms of 3D structures. The algorithm combines a number of features that have proven useful in other algorithms. To accommodate structures of arbitrary geometry, we define the subsurface using a large number of prisms, with the depths to the tops and bottoms as unknowns to be determined by optimization. Included in the optimization process are the three components of the magnetization vector and the density contrast, which is assumed to be a continuous function with depth. We use polynomial varia

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27

Li, Ling, Haifei Tian, Qiangqiang Yun, and Wei Chu. "Study on temperature rise distribution of contact surface under cyclic load." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 235, no. 1 (2020): 138–48. http://dx.doi.org/10.1177/1350650120919877.

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A large amount of heat is generated during the friction of joint surfaces, which has a significant influence on the contact characteristics of surfaces, causing deformation or failure of key components. A two-dimensional friction-thermal structure coupling contact model of cylinder/plane was established in ABAQUS. The effects of roughness under different fractal parameters, tangential load amplitude and cycle number on the temperature rise distribution of a contact surface under normal cyclic loading were studied. The results show that with the increase of roughness and tangential load amplitu

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28

Zhu, Linbo, Jun Hong, Guoqing Yang, and Xiangjun Jiang. "Experimental study on initial loss of tension in bolted joints." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 10 (2015): 1685–96. http://dx.doi.org/10.1177/0954406215583080.

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The initial loss of tension in individual bolts after initial tightening obviously affects the level and the stability of the clamp load in bolted joints. A high-precision instrument to analyze the clamp load loss was developed. In this instrument, an Atlas Copco’s high performance spindle with an accuracy of ±2.5% under the conditions of one million duty cycles was used to tighten the test bolts and nuts. A rotary torque-angle transducer was integrated in the tightening spindle to measure the tightening torque. KMR force washer with a repeatability of < ±1% was applied to monitor the clamp

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29

Li, Zhenyuan, Yimin Zhang, Changyou Li, and Zhi Tan. "Dynamic and Stability Analysis of Multibolt Plane Joints under Normal Forces." Applied Sciences 9, no. 24 (2019): 5521. http://dx.doi.org/10.3390/app9245521.

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In this paper, a stiffness model of contact surfaces based on a modified three-dimensional fractal contact model is built, which is in accordance with the experiment results. Additionally, the static, dynamic, and stable behaviors of the bolt joint between the spindle box and the machine bed are analyzed. The mathematical relationship between fractal parameters of the surface topography and the stiffness of the system was established to accurately study its static behaviors. Asymmetric curves are observed from the load–deflection results and the nonlinear stiffness characteristic is also prese

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30

Raj, Arun P., Ankush Bhatti, and P. B. Dhanish. "Combined effect of cylindricity, roundness and roughness on axial load-carrying ability of interference fits." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 11 (2020): 1697–711. http://dx.doi.org/10.1177/1350650120919883.

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Interference fits are commonly used in engineering for various applications. While the effect of many factors on the load-carrying ability of interference fits has been studied extensively, the combined effect of cylindricity, roundness and roughness does not appear to have been considered to that extent, and this paper is an attempt to remedy the situation. As a first step, finite element method was used to verify that there will be a reduction in the load-carrying ability due to the introduction of perfect geometrical deviations on the shaft. Thereafter, a detailed experimental investigation

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31

Caliendo, Ciro, Maurizio Guida, and Emiliana Pepe. "Seemingly Unrelated Regression Equations for Developing a Pavement Performance Model." Modern Applied Science 9, no. 13 (2015): 199. http://dx.doi.org/10.5539/mas.v9n13p199.

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<p>The paper presents a joint analysis of some pavement performance indicators based on a system of seemingly unrelated regression equations (SURE) which allows to handle correlated error terms. In particular, three major indicators such as the side friction coefficient (SFC20°C), mean-profile depth (MPD), and international roughness index (IRI), were measured in a case study and subsequently used in analysis. Regression parameters were estimated by the Maximum Likelihood Method and the t-statistic was considered to show the statistical significance of regression coefficients. The result

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32

Terefe, Tesfaye Olana, Hirpa G. Lemu, and Addisu K/Mariam. "Review and synthesis of a walking machine (Robot) leg mechanism." MATEC Web of Conferences 290 (2019): 08012. http://dx.doi.org/10.1051/matecconf/201929008012.

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A walking machine (robot) is a type of locomotion that operates by means of legs and/or wheels on rough terrain or flat surface. The performance of legged machines is greater than wheeled or tracked walking machines on an unstructured terrain. These types of machines are used for data collections in a variety of areas such as large agricultural sector, dangerous and rescue areas for a human. The leg mechanism of a walking machine has a different joint in which a number of motors are used to actuate all degrees of freedom of the legs. In the synthesis of walking machine reported in this article

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33

deGroot‐Hedlin, C., and S. Constable. "Occam’s inversion to generate smooth, two‐dimensional models from magnetotelluric data." GEOPHYSICS 55, no. 12 (1990): 1613–24. http://dx.doi.org/10.1190/1.1442813.

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Magnetotelluric (MT) data are inverted for smooth 2-D models using an extension of the existing 1-D algorithm, Occam’s inversion. Since an MT data set consists of a finite number of imprecise data, an infinity of solutions to the inverse problem exists. Fitting field or synthetic electromagnetic data as closely as possible results in theoretical models with a maximum amount of roughness, or structure. However, by relaxing the misfit criterion only a small amount, models which are maximally smooth may be generated. Smooth models are less likely to result in overinterpretation of the data and re

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34

Nelson, M. A., E. R. Pardyjak, M. J. Brown, and J. C. Klewicki. "Properties of the Wind Field within the Oklahoma City Park Avenue Street Canyon. Part II: Spectra, Cospectra, and Quadrant Analyses." Journal of Applied Meteorology and Climatology 46, no. 12 (2007): 2055–73. http://dx.doi.org/10.1175/2006jamc1290.1.

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Abstract Velocity data were obtained within Park Avenue in Oklahoma City, Oklahoma, using three-dimensional sonic anemometers under unstable atmospheric conditions. These data are used to produce velocity spectra, cospectra, and weighted joint probability density functions at various heights and horizontal locations in the street canyon. This analysis has helped to describe a number of physically interesting urban flow phenomena. Previous research has shown that the ratio of Reynolds shear stresses to normal stresses is typically much smaller deep within the canopy than those ratios found at t

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35

Shao, Jianli, Qi Zhang, Wenbin Sun, Zaiyong Wang, and Xianxiang Zhu. "Numerical Simulation on Non-Darcy Flow in a Single Rock Fracture Domain Inverted by Digital Images." Geofluids 2020 (June 27, 2020): 1–13. http://dx.doi.org/10.1155/2020/8814327.

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The influence of rock seepage must be considered in geotechnical engineering, and understanding the fluid flow in rock fractures is of great concern in the seepage effect investigation. This study is aimed at developing a model for inversion of rock fracture domains based on digital images and further study of non-Darcy flow. The visualization model of single rock fracture domain is realized by digital images, which is further used in flow numerical simulation. We further discuss the influence of fracture domain geometry on non-Darcy flow. The results show that it is feasible to study non-Darc

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Lewis, R., M. B. Marshall, and R. S. Dwyer-Joyce. "Measurement of interface pressure in interference fits." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 219, no. 2 (2005): 127–39. http://dx.doi.org/10.1243/095440605x8432.

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When components such as bearings or gears are pressed onto a shaft, the resulting interference induces a pressure at the interface. The size of this pressure is important as many components fail because fatigue initiates from press-fit stress concentrations. The aim of the present work was to develop ultrasound as a tool for non-destructive determination of press-fit contact pressures. An interference fit interface behaves like a spring. If the pressure is high, there are few air gaps, so it is very stiff and allows transmission of an ultrasonic wave. If the pressure is low, then interface sti

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Mamot, Philipp, Samuel Weber, Tanja Schröder, and Michael Krautblatter. "A temperature- and stress-controlled failure criterion for ice-filled permafrost rock joints." Cryosphere 12, no. 10 (2018): 3333–53. http://dx.doi.org/10.5194/tc-12-3333-2018.

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Abstract. Instability and failure of high mountain rock slopes have significantly increased since the 1990s coincident with climatic warming and are expected to rise further. Most of the observed failures in permafrost-affected rock walls are likely triggered by the mechanical destabilisation of warming bedrock permafrost including ice-filled joints. The failure of ice-filled rock joints has only been observed in a small number of experiments, often using concrete as a rock analogue. Here, we present a systematic study of the brittle shear failure of ice and rock–ice interfaces, simulating the

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Ivanschikov, Yuriy, Vasiliy Skovorodin, Yuriy Dobrohotov, Roman Andreev, Aleksandr Vasil'ev, and Ayrat Valiev. "RESEARCH OF THE WEAR MECHANISM OF BEARING SEATS OF AUTOMOTOR-TRACTOR TRANSMISSIONS." Vestnik of Kazan State Agrarian University 16, no. 4 (2021): 71–79. http://dx.doi.org/10.12737/2073-0462-2021-71-79.

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A significant number (up to 25%) of failures of automotive transmissions are associated with a loss of rigidity in the rolling bearings. One of the main reasons for the loss of stiffness in rolling bearings is a violation of the tightness of the bearing on the shaft and in the housing due to fretting corrosion. The paper presents the results of a study of the causes of fretting corrosion in bearing fits and the patterns of its development. The conditions promoting the occurrence of the fretting process are determined and the factors characterizing the nature and intensity of destruction of con

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Hong, Sungwook, Hwa-Jeong Seo, and Young-Joo Kwon. "A Unique Satellite-Based Sea Surface Wind Speed Algorithm and Its Application in Tropical Cyclone Intensity Analysis." Journal of Atmospheric and Oceanic Technology 33, no. 7 (2016): 1363–75. http://dx.doi.org/10.1175/jtech-d-15-0128.1.

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AbstractThis study proposes a sea surface wind speed retrieval algorithm (the Hong wind speed algorithm) for use in rainy and rain-free conditions. It uses a combination of satellite-observed microwave brightness temperatures, sea surface temperatures, and horizontally polarized surface reflectivities from the fast Radiative Transfer for TOVS (RTTOV), and surface and atmospheric profiles from the European Centre for Medium-Range Weather Forecasts (ECMWF). Regression relationships between satellite-observed brightness temperature and satellite-simulated brightness temperatures, satellite-simula

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Chen, Jiqian, Jun Ye, Shigui Du, and Rui Yong. "Expressions of Rock Joint Roughness Coefficient Using Neutrosophic Interval Statistical Numbers." Symmetry 9, no. 7 (2017): 123. http://dx.doi.org/10.3390/sym9070123.

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Courville, Zoe R., Ross Lieb-Lappen, Keran Claffey, and Bruce Elder. "Investigations of skeletal layer microstructure in the context of remote sensing of oil in sea ice." International Oil Spill Conference Proceedings 2017, no. 1 (2017): 2237–55. http://dx.doi.org/10.7901/2169-3358-2017.1.2237.

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ABSTRACT (2017-159) The Arctic Oil Spill Response Technology – Joint Industry Program (JIP) funded a controlled basin experiment in November 2014 to assess the relative capabilities of a variety of oil in ice remote sensing techniques. An 80-cm sheet of level salt-water ice was grown in the Test Basin facility at the US Army Corps of Engineers Cold Regions Research and Engineering Laboratory (CRREL) in Hanover, New Hampshire. The basin ice was representative of natural level sea ice grown under quiescent conditions. This created a controlled baseline environment to compare different sensors wi

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Chen, Jiqian, Jun Ye, and Shigui Du. "Scale Effect and Anisotropy Analyzed for Neutrosophic Numbers of Rock Joint Roughness Coefficient Based on Neutrosophic Statistics." Symmetry 9, no. 10 (2017): 208. http://dx.doi.org/10.3390/sym9100208.

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Majumdar, A., and B. Bhushan. "Fractal Model of Elastic-Plastic Contact Between Rough Surfaces." Journal of Tribology 113, no. 1 (1991): 1–11. http://dx.doi.org/10.1115/1.2920588.

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Roughness measurements by optical interferometry and scanning tunneling microscopy on a magnetic thin-film rigid disk surface have shown that its surface is fractal in nature. This leads to a scale-dependence of statistical parameters such as r.m.s height, slope and curvature, which are extensively used in classical models of contact between rough surfaces. Based on the scale-independent fractal roughness parameters, a new model of contact between isotropic rough surfaces is developed. The model predicts that all contact spots of area smaller than a critical area are in plastic contact. When t

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Dulucheanu, Constantin, Nicolai Bancescu, and Traian Severin. "Technological Characteristics of a Dual-Phase Steel with 0.09% C and 1.90% Mn Obtained by Intercritical Quenching." Advanced Materials Research 814 (September 2013): 60–67. http://dx.doi.org/10.4028/www.scientific.net/amr.814.60.

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With this article, the authors present a number of technological characteristics determined for a dual-phase steel with 0.09% C and 1.90% Mn. This steel was obtained through intercritical quenching: heating at 740, 780 and 820 °C, maintaining for 30 minutes and then cooling in water, oil, oil in magnetic field of direct current (DC) and oil in ultrasonic field. It was determined the degree of cold upsetting, the ultimate tensile strength of the resistance butt welded joints and the cutting property based on the study of cutting forces and surface roughness; it was analyzed the influence of hea

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Szymiczek, Małgorzata, and Błażej Chmielnicki. "Influence of epoxy resin curing systems and aluminium surface modification on selected properties of adhesive joints." Polish Journal of Chemical Technology 20, no. 4 (2018): 26–31. http://dx.doi.org/10.2478/pjct-2018-0050.

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Abstract The aim of the present study was to investigate the effect of epoxy resin curing agents and aluminium surface modification on the properties of adhesive joints which were subjected to aging under thermal shock conditions. Composites containing reinforced aramid and carbon fibres with aluminium flat profiles (alloy Al 5754) were tested under shear conditions. Epoxy resin (Araldite LY 1564) with amine curing agents (Aradur 3486, Aradur 3487 and Aradur 3405) was used as a matrix. Composites were made using vacuum-assisted contact lamination. The degree of degradation was assessed on the

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Shintoku, Kousuke, and Hirohisa Narita. "Study on Ball End Milling of Inclined Surfaces for Ultra High Molecular Weight Polyethylene." International Journal of Automation Technology 11, no. 6 (2017): 948–57. http://dx.doi.org/10.20965/ijat.2017.p0948.

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Ultra-high molecular weight polyethylene (UHMWPE) is a polyethylene with a molecular weight ranging from one million to seven million. UHMWPE is often used for constructing sliding parts such as artificial knees, hip joints, and gears owing to its self-lubrication, wear resistance, biocompatibility, and light weight structure. High accuracy and smooth surfaces are required for UHMWPE parts. Cutting operations of UHMWPE are particularly suitable for small numbers of products and to realize high shape accuracy. This paper describes some surface properties due to ball end mill operations of incli

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Gleb V, Martynov, Aleksey I. Makarov, Elena A. Morina, and Daria E. Monastyreva. "Stress-strain state of friction joints with laser treatment of contact surfaces." Vestnik MGSU, no. 1 (January 2019): 72–82. http://dx.doi.org/10.22227/1997-0935.2019.1.72-82.

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Introduction. Researched is conducted to determine the possibility of using an alternative method - laser cleaning. Laser systems have proven themselves in many areas and are a high-tech and effective solution for many construction problems. Despite this nowadays sandblasting is the most common method of processing contact surfaces of high-strength bolted joints - an outdated technology, with high equipment wear and even dangerous to people’s health. Materials and methods. Sandblast and laser-treated specimens were tested for shear. Before testing, the roughness of the contact surfaces and the

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Ragab, Mohamed, Hong Liu, Guan-Jun Yang, and Mohamed M. Z. Ahmed. "Friction Stir Welding of 1Cr11Ni2W2MoV Martensitic Stainless Steel: Numerical Simulation Based on Coupled Eulerian Lagrangian Approach Supported with Experimental Work." Applied Sciences 11, no. 7 (2021): 3049. http://dx.doi.org/10.3390/app11073049.

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1Cr11Ni2W2MoV is a new martensitic heat-resistant stainless steel utilized in the manufacturing of aero-engine high-temperature bearing components. Welding of this type of steel using fusion welding techniques causes many defects. Friction stir welding (FSW) is a valuable alternative. However, few investigations have been performed on the FSW of steels because of the high melting point and the costly tools. Numerical simulation in this regard is a cost-effective solution for the FSW of this steel in order to optimize the parameters and to reduce the number of experiments for obtaining high-qua

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49

Warpinski, N. R. "Measurement of Width and Pressure in a Propagating Hydraulic Fracture." Society of Petroleum Engineers Journal 25, no. 01 (1985): 46–54. http://dx.doi.org/10.2118/11648-pa.

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Abstract Measurements of width and pressure in a propagating hydraulic fracture have been made in tests conducted at the U.S. DOE's Nevada test site. This was accomplished by creating an "instrumented fracture" at a tunnel complex (at a depth of 1,400 ft [425 m]) where realistic insitu conditions prevail, particularly with respect to stress and geologic features such as natural fractures and material anisotropy. Analyses of these data show that the pressure drop along the fracture length is much larger than predicted by viscous theory, which currently is used in models, This apparently is caus

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BEREZIN, MIKHAIL. "METHODS AND RESULTS OF MICROMETER STUDIES OF HYDRAULIC SYSTEM SEALING UNITS OF AGRICULTURAL MACHINERY." Tekhnicheskiy servis mashin 4, no. 141 (2020): 12–19. http://dx.doi.org/10.22314/2618-8287-2020-58-4-12-19.

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End-type sealing units based on round-section rubber rings are the most common types of seals for volumetric hydraulic drive units of various agricultural machinery. Its service life depends on the correspondence of the geometric dimensions of the elements that make them up, as well as on the combination of limit deviations of the specified elements. (Research purpose) The research purpose is in studying deviations and identifying statistical distribution of the cross-section diameters of new rings and the depth of grooves under them in order to determine the number of connections that meet th

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