Maximum residual contact stress in spinning process of SS304/20 bimetallic pipe

Background: Nanofiber’s productivity plagues nanofibrous membranes’ applications in many areas. Herein, we present the needle-disk electrospinning to improve throughput. In this method, multiple high-curvature mentals are used as the spinning electrode. Methods: Three aspects were investigated: 1) mechanism elucidation of the needle-disk electrospinning; 2) parameter optimization of the needle-disk electrospinning; 3) productivity improvement of the needle-disk electrospinning. Results: Results show that high-curvature electrode evokes high electric field intensity, making lower voltage supply in spinning process. The needle number, needle length and needle curvature synergistically affect the spinning process and nanofiber morphology. Additionally, higher disk rotation velocity and higher voltage supply can also result in higher nanofiber’s productivity. Conclusion: Compared with previous patents related to this topic, the needle-disk electrospinning is featured with the merits of high throughput, low voltage supply, controllable spinning process and nanofiber morphology, benefiting the nanofiber practical industrial employment and further applications of nanofiber-based materials.

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Meshing and Bearing Analysis of Nutation Drive with Face Gear

Recent Patents on Mechanical Engineering ◽

10.2174/2212797613999200420161031 ◽

2020 ◽

Vol 13 (4) ◽

pp. 352-365

Author(s):

Guangxin Wang ◽

Lili Zhu ◽

Peng Wang ◽

Jia Deng

Keyword(s):

Contact Stress ◽

High Efficiency ◽

Transmission Ratio ◽

Contact Strength ◽

Hertz Contact ◽

Face Gear ◽

Compact Structure ◽

Gear Teeth ◽

Gear Drive ◽

Number Of Teeth

Background: Nutation drive is being extensively investigated due to its ability to achieve a high reduction ratio with a compact structure and the potential for low vibration, high efficiency and design flexibility. However, many problems including the difficulty to process the inner bevel gear, less number of teeth in engagement and not being suitable for high-power transmission have restricted its development. Objective: The purpose of this paper is to analyze the contact strength of a patent about a new nutation drive developed based on meshing between two face gears, which has the advantages of both face gear and nutation drive, including large transmission ratio, large coincidence, small size, compact structure and strong bearing capacity. Methods: Based on the meshing principle and basic structure of the nutation face gear drive, the contact strength of nutation face gear transmission is analyzed by the Hertz contact analysis method and FEM method. Results: The maximum stress values of nutation face gear teeth are compared by two methods, which verify the accuracy of Hertz contact analytical method in calculating the contact strength of nutation face gear teeth. Furthermore, nine groups of three-dimensional models for the nutation face gear drive with a transmission ratio of 52 and different cutter parameters are established. Conclusion: The study analyzes the contact stress of fixed and rotary face gears in meshing with planetary face gears, and obtains the distribution law of contact stress and the influence of the number of teeth and parameters of the cutter on the load-carrying capacity.

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Study on strong spinning preparation method and mechanism of the industrial pure titanium ultrafine crystallization

Journal of Engineered Fibers and Fabrics ◽

10.1177/1558925019895256 ◽

2019 ◽

Vol 14 ◽

pp. 155892501989525

Author(s):

Yu Yang ◽

Yanyan Jia

Keyword(s):

Heat Treatment ◽

High Performance ◽

Pure Titanium ◽

Grain Structure ◽

Theoretical Research ◽

Ultrafine Grain ◽

Forming Process ◽

Spinning Process ◽

And Performance ◽

Material Utilization

Ultrafine crystallization of industrial pure titanium allowed for higher tensile strength, corrosion resistance, and thermal stability and is therefore widely used in medical instrumentation, aerospace, and passenger vehicle manufacturing. However, the ultrafine crystallizing batch preparation of tubular industrial pure titanium is limited by the development of the spinning process and has remained at the theoretical research stage. In this article, the tubular TA2 industrial pure titanium was taken as the research object, and the ultrafine crystal forming process based on “5-pass strong spin-heat treatment-3 pass-spreading-heat treatment” was proposed. Based on the spinning process test, the ultimate thinning rate of the method is explored and the evolution of the surface microstructure was analyzed by metallographic microscope. The research suggests that the multi-pass, medium–small, and thinning amount of spinning causes the grain structure to be elongated in the axial and tangential directions, and then refined, and the axial fiber uniformity is improved. The research results have certain scientific significance for reducing the consumption of high-performance metals improving material utilization and performance, which also promote the development of ultrafine-grain metals’ preparation technology.

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Comparison of Results of Analyses the Foundation Slab Calculated by Two FEM Programs

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1065-1069.1052 ◽

2014 ◽

Vol 1065-1069 ◽

pp. 1052-1056

Author(s):

Radim Čajka ◽

Jana Vaskova

Keyword(s):

Contact Stress ◽

Bending Moments ◽

Foundation Slab ◽

Interaction Models ◽

Comparison Of Results

For decades attention has been paid to interaction of foundation structures and subsoil and development of interaction models. Currently there are several software that, can deal with the interaction of foundations and subsoil. The purpose of this paper is to compare resulting deformation of the slab, subsidence of the subsoil, bending moments and contact stress calculated by two different software based on FEM calculations. Calculated deformation of the slab is compared with deformation measured during experiment.

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Based on ANSYS Planetary Gear Ransmission Design Analysis

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.314-316.1218 ◽

2011 ◽

Vol 314-316 ◽

pp. 1218-1221

Author(s):

Hao Min Huang

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Contact Stress ◽

Planetary Gear ◽

Design Analysis ◽

Ansys Software ◽

Element Analysis ◽

Planet Gear ◽

Gear Contact ◽

Transmission Gear

Conventional methods of design to be completed ordinary hydraulic transmission gear gearbox design, but for such a non-planet-rule entity, and the deformation of the planet-gear contact stress will have a great impact on the planet gear, it will be very difficult According to conventional design. In this paper, ANSYS software to the situation finite element analysis, the planetary gear to simulate modeling study.

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Thermomechanical Coupling of a Hyper-viscoelastic Truck Tire and a Pavement Layer and its Impact on Three-dimensional Contact Stresses

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/03611981211017140 ◽

2021 ◽

pp. 036119812110171

Author(s):

Angeli Jayme ◽

Imad L. Al-Qadi

Keyword(s):

Contact Stress ◽

Contact Area ◽

Three Dimensional ◽

Interaction Model ◽

Rolling Resistance ◽

Contact Stresses ◽

Thermomechanical Coupling ◽

Temperature Profiles ◽

Near Surface ◽

Truck Tire

A thermomechanical coupling between a hyper-viscoelastic tire and a representative pavement layer was conducted to assess the effect of various temperature profiles on the mechanical behavior of a rolling truck tire. The two deformable bodies, namely the tire and pavement layer, were subjected to steady-state-uniform and non-uniform temperature profiles to identify the significance of considering temperature as a variable in contact-stress prediction. A myriad of ambient, internal air, and pavement-surface conditions were simulated, along with combinations of applied tire load, tire-inflation pressure, and traveling speed. Analogous to winter, the low temperature profiles induced a smaller tire-pavement contact area that resulted in stress localization. On the other hand, under high temperature conditions during the summer, higher tire deformation resulted in lower contact-stress magnitudes owing to an increase in the tire-pavement contact area. In both conditions, vertical and longitudinal contact stresses are impacted, while transverse contact stresses are relatively less affected. This behavior, however, may change under a non-free-rolling condition, such as braking, accelerating, and cornering. By incorporating temperature into the tire-pavement interaction model, changes in the magnitude and distribution of the three-dimensional contact stresses were manifested. This would have a direct implication on the rolling resistance and near-surface behavior of flexible pavements.

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