advances in mechanical engineering hindawi

In order to improve the efficiency of underground mining and tunneling operations and to realize automatic drilling, it is necessary to develop the automation system for large drill jumbos. An illustrative example is the production of fruit yoghurt of various types. By analyzing the motion relationship between tool path and workpiece surface, the reasons for improved workpiece surface quality by ultrasonic vibration–assisted machining were explained. The weld shape, weld macrostructure, microstructure, strength and hardness, and the content of the ferrite in the weld zone, heat-affected zone, and base metal were emphatically investigated. In this study, the surface defects in the workpieces caused by the electrical discharge machining process were eliminated with the plasma etching treatment. Results indicate that when process parameters (vibration frequency, ultrasonic amplitude, and cutting parameters) are suitably selected, ultrasonic vibration–assisted turning can gain access to better chip shape and chip breaking effect than conventional turning. Advances in Mechanical Engineering (AIME) is a peer-reviewed, open access journal that publishes original research articles as well as review articles in all areas of mechanical engineering. We are committed to sharing findings related to COVID-19 as quickly as possible. The plasticity models in finite element codes are often not able to describe the cyclic plasticity phenomena satisfactorily. Papers are selected from over 10,000 That is why the sustainable manufacturing concept is gaining increasing attention both in the research community and in organizations, especially in the industrial sector. Moreover, it is found that superior chip morphology in ultrasonic vibration–assisted turning can be acquired under the circumstance of comparatively small cutting parameters (cutting speed, depth of cut, and feed rate); at the same time, preferable chips can also obtain ranking machining effect. The difference of chip morphology between ultrasonic vibration–assisted turning and conventional turning is contrasted and analyzed from the macroscopic and microscopic point of view. The research aimed to determine whether vibratory stress relief is feasible to improve the fatigue life of aluminum alloy 7075-T651 or not. The results show that an even phase proportion and grain refinement are not necessarily guaranteed to provide good welding surface quality. A continuum damage model was adopted to fit the rupture stress versus creep time data, and the results showed the reliability of this model in describing the creep behavior and predicting the creep life. The strengthening effect and uniformity of residual stress and strain of 7075-T6 aviation aluminum after laser shock peening were investigated. The investigation included three separate circumstances: high-temperature dynamic water, high-temperature still water, and low-temperature still water. Three sets of material model parameters were obtained using the built-in routines and results were compared to experiments. The elastic modulus of AISI 1045 steel calculated is as the same as that by the traditional nanoindentation method. The dynamic constitutive relation of the material at high strain rates was studied, and the constitutive model in accordance with Cowper–Symonds form was established. Surface integrity measurements, fatigue fracture analysis, and fatigue life tests are conducted to reveal the effect of surface integrity on crack initiation and fatigue life. Experimentally, five machining regimes that are reduced in accordance with the discharge energy were conducted with acoustic emission detection technology in low-speed wire electrical discharge machining. The results reveal that the axial depth of cut is the most important factor influencing the residual stress distribution of the machined pocket surface, and the more tensile stress states are found with the increase in axial cutting depth due to the thermal deformation. Regardless of the welding conditions, the alpha (α) and alpha prime (α′) phases were detected in the stir zone, whereas the base metal was composed of alpha (α) and beta (β) phases. Similarly, maximum shear stress obtained from the finite element analysis is used to obtain minimum adhesion requirements for three-dimensional printed implants. The microstructure was investigated using field emission scanning electron microscopy, electron backscattered diffraction and X-ray diffraction measurements. An ultrasonic vibration–assisted system was integrated into a standard lathe to demonstrate thread turning in Inconel 718 superalloy. Hydrodynamic forces and flow structures are compared to the results with the equivalent 2D computations. Test results show that the wireless synchronous control system can meet the technical requirements of 50,000-t trains and its operation is feasible. The minimum value of U is obtained in the 6 × 6 spot array (the corresponding overlap ratio is 58%), which suggest that the most uniform deformation peened area can be obtained by using 58% overlap ratio in the laser shot peening process, which can avoid stress concentration and improve fatigue life. The research of kinematics is the basis of real-time and robust robot control. Tungsten inert gas welding and vacuum brazing butt joints of Al–Mg–Si alloy 6061 in the artificially aged condition T6 were studied. The velocity of the drop assembly showed parabolic growth. It is helpful to further study the reliability change of wind power gears under high cycle fatigue. The comparative analysis of the actual testing results indicates that the optimum feed parameters are feed torque of triple torque extruder, feed speed of 20 mm/s, and feed material of ABS. Advances in Industrial and Manufacturing Engineering is a gold open access journal covering all topics in industrial and manufacturing engineering. The driving torque, driving power, and required output work of motors have been computed in the inverse rigid-body dynamics analysis. The work in this study presents an experimental evaluation on minimum quantity cooling lubrication based on the Ranque–Hilsch vortex tube and minimum quantity lubrication performance in hard drilling of Hardox 500 steel (49–50 HRC) using coated carbide drills. The combustion process of one 1000-MW ultra-supercritical double-tangential-circle boiler was numerically studied and the three-dimensional full-size structure of the boiler was full considered. Furthermore, the largest elongation from strength test has been observed for the weld samples made with laser power of 2.0 kW. Namely, metal feeding of 2024 aluminium powder is considered to produce clad traces on 2024 aluminium plates, aiming to give grounds for repairing damaged real components using materials with same or similar features with respect to the parent metal. After rolling to a thickness reduction of 30%, 50%, and 70%, the mechanical properties of the rolled steels were substantially increased, as the deformation increased from 30% to 50%, the tensile strength increased from 650 to 1110 MPa, the yield strength increased from 400 to 665 MPa, and the elongation increased from 8% to 8.5%. Welding parameters such as welding power (kW) and the focus distance from the joint surface (mm) were changed. Then four experiments conducted on real trains or in laboratory are described. 2017: Advances in Automation Technology for Mechanical Engineering Guest Editors: Mei-Yung Chen, Neal Lii, Juin Liou, Chii-Rong Yang, Yu-Sheng Lu, Chun-Ta Chen & Gao-Wei Chang 2016: New Developments in Multibody System Dynamics and Its Applications 2016 Hindawi Volume 2018 Mathematics Journal of Hindawi Volume 2018 Mathematical Problems in Engineering Applied Mathematics Journal of Hindawi Volume 2018 Probability and For vacuum brazing components, the tensile strength–based thickness correction method was better than the thickness correction methods recommended by the International Institute of Welding and Eurocode 9. In this way, sustainable manufacturing practices seem to be reinforced by initiatives within the fourth stage of industrialization – the so-called Industry 4.0 – which offers great opportunities for sustainable manufacturing, thanks to digital transformation. Two different failure modes were revealed: interfacial failure mode and pullout failure mode. The boiling visualization further indicates that the minichannels with the saw-tooth structures interrupt the boundary layer and restrain the coalescence of the bubble, which may be the reason for the critical heat flux enhancement. According to the law of fatigue damage generation and development, a residual strength degradation model is proposed. Four ceramic coating materials, that is, alumina, CoCrMo, TiN, and zirconia, are discussed for each routine human physical activity. The workpiece treated with the plasma etching had the smallest roughness of 12.2 µm, the largest contact angle of 92°, and 25% increase in the fatigue life. In this article, an ultrasonic vibration–assisted turning system is proposed for thread cutting operations in superalloys. Impeller is a key component of a canned nuclear coolant pump. It was found that the membranous leaf sheath of rhizoma imperatae can shuttle in soil, owing to not only its own growth force, but also the anti-adhesion function due to the hydrophobicity and special surface texture. Obtaining the parameters using the built-in routines is therefore easier and allows using the advanced modelling for practical use. The finite element results are then coupled with experimental results as the maximum principal stress obtained from the finite element analysis is used to obtain minimum hardness requirements. Furthermore, LLR (Local Linear Regression), LWR (Local Weighted Linear Regression) and LLE (Local Linear Embedding) algorithms are respectively combined with VQTAM to get three improvement algorithms, aiming to further optimize the prediction accuracy of the networks. Editorial International Conference on Advances in Mechanical Engineering and Mechanics 2010 SamiEl-Borgi 1,2 Mechanical Engineering Program, Texas A&M University at Qatar, Doha, Qatar Second, the edge burr removal process of the hole exit was also studied, and the geometry of the burrs was measured before and after the magnetic abrasive finishing process. A finite element model, physical parameters of U71Mn, and parameter setting of simulation were introduced in detail. The metal flow rules of typical metal particles in rolled stock cross-section during the whole heavy rail rolling were obtained. Creep curves were analyzed to elucidate the creep behavior and creep rupture mechanism of the 15CrMoG steel. Special Issue - Volume 2020 The influences of primary and over-fire air velocity as well as the jet structure on NOx generation characteristics were examined. Accordingly, this article first presents an overview of the main concepts related to sustainable manufacturing, and metrics to evaluate organizations’ sustainability performance, and then an outlook of current trends. We use tensile–shear tests to investigate the failure modes of Ti–1Al–1Mn microscale resistance spot welds and to determine how the failure mode affects the microstructure, microhardness profile, and mechanical performance. The experimental results indicate that acoustic emission testing technique provides great technical support in researching the discharge energy variation rule in low-speed wire electrical discharge machining. As the closed-loop controllers corresponding to all joints are local and independent of each other, the whole system is not a closed-loop feedback control. The results show that shot peening can reduce the dispersion and instability of surface integrity brought by milling processing, although it increases the surface roughness; the maximum residual compressive stress and depth of residual stress layer increase significantly after shot peening, and the residual stress and hardening distribution are very good; larger surface roughness and irregular surface scratches of milling samples before shot peening easily lead to cracks and gouges produced on shot peening surface. Advances in Materials Science and Engineering-Special Issue Volume 2020 - Article ID 4835704 - Research Article Comparison of Mechanical Properties of Cement-Stabilized Loess Produced Using Different Compaction Methods In addition, the pattern of residual stress distribution of the square pocket surface is dramatically changed and the more tensile stresses are produced as the milling operation further proceeds. The characteristics of the flow field, particle motion, temperature distribution, species components, and NOx emissions were numerically investigated. The phenomenon of soil adhesion occurs when soil-tillage implements interact with soil, which often increases the working resistance and energy consumption. We show an example of designing and developing, on the basis of the proposed 8C architecture, a smart factory cyber-physical system, including an Industrial Internet of Things gateway and a smart factory data center running in the cloud environment. Usage of material model implemented in Code_Aster provided good simulations in a relatively simple way through the use of an advanced cyclic plasticity model via built-in auxiliary functions. Minimal distortion, reduced heat-affected zones and better surface quality are benefited in comparison with conventional techniques. Also, based on the optimization results, the validation experiments are conducted to study more on drilling thrust force, chip morphology, and tool wear. The acceleration sensor was fixed up the color mixing nozzle to analyze the vertical vibration of the nozzle. And, the error is less than 6% compared with the tensile test, which is within the range of the elastic modulus of the material. The sensitivity analysis was performed prior to the model calibration to find out whether all the material model parameters were important. This article first introduces the types and changes of chip, meanwhile the chip formation mechanism of ultrasonic vibration–assisted turning is studied and analyzed, and the turning experiments of 304 austenitic stainless steel with and without ultrasonic vibration are carried out. Friction stir welding of Ti–6Al–4V alloy sheets was successfully performed with a tungsten carbide (WC) tool, and the effect of the tool rotational speed on the microstructure and mechanical properties of the joints was evaluated. Then, based on the principle of mesomechanical analysis, the computational representative volume element models are reconstructed according to the three metallographic images of AISI 1045 steel surface collected by the test equipment. However, even today, there is a great diversity of interpretations and ideas associated with this term. First, the load–depth curves of exact location of ferrite, pearlite and grain boundary on the surface of AISI 1045 steel are obtained by 30 groups of in situ nanoindentation tests. Within the limits of secondary air, more steady combustion process is achieved as well as the reduction of NOx. Three-dimensional metal particle flow simulation during the whole rolling process for 60 kg/m heavy rail was accomplished by explicit dynamic finite element method and modified updating geometric method. The cutting parameters that affect the cutting force and surface roughness in milling machining were analysed and the common rules were concluded in this article based on a series of cutting experiments. A novel denoising method has been proposed, which combines filtering analysis and Fast Fourier Transform. Developing a user-defined material model is a demanding process, challenging especially for industry. Advances in Mechanical Engineering | Citations: 506 | Read 1100 articles with impact on ResearchGate, the professional network for scientists. Substrate surface roughness and coating thickness of TiN were varied for correlative analysis among adhesion, mechanical, and tribological properties. An index U for evaluating the strain uniformity in the peened area was proposed based on the statistical processing of the equivalent strain distribution in the peened area. To improve the blockage and printing quality of the color mixing nozzle of fused deposition modeling color 3D printer, the feed parameters of fused deposition modeling color 3D printer were studied by vibration test. In this study, machining characteristics and mechanical properties of aluminum (Al) alloy 6061 were investigated with variations in discharge currents in electrical discharge machining. The error between the yield strength calculated and tensile test results is 3.4%. Meanwhile, the surface integrity and the fatigue properties of the workpiece improved significantly. The purpose of this study is to analyze the mechanical properties of individual three-dimensional scanned hip joint human bone geometry through numerical simulation and relate these properties to hardness and adhesion values of bio-compatible coatings. Advances in Civil Engineering publishes original research articles as well as review articles in all areas of civil engineering. The rigid-body dynamic model is developed by means of the principle of virtual work and the concept of link Jacobian matrices. The current results may provide a theoretical basis for burner design improvement. The responses are discussed in terms of geometry, microstructure and microhardness both in the fusion zone and in the heat-affected zone; the optimization is conducted via desirability functions, based on proper technical constraints upon numerical modelling. Advances in Materials Science and Engineering publishes research in all areas of materials science and engineering, including the synthesis and properties of materials, and their applications in engineering applications. The evaluation of magnet spinning speed, abrasive mesh, and abrasive filling amount on the diameter deviation of the hole and surface roughness of the inner wall was studied. The cutting speed was linked to the chip formation process and tool failure mechanisms of the coated cemented cutting tools. The relationship between the thickness of the white layer and the fatigue lifetime had a very strong positive correlation. Advances in Civil Engineering published special issues feature collections of articles based around a common theme, author or event We are committed to sharing findings related to COVID-19 as quickly as possible. In this study, we conducted a simulation investigation of a hypothetical core barrel assembly drop accident based on the dynamic mesh model. The welds that fail by pullout failure mode have much better mechanical properties than those that fail by interfacial failure mode. Furthermore, the influences of the secondary air, over-fire air, and additional air on the NOx emissions are obtained. Two mean stress correction methods, Goodman and Gerber, were evaluated. However, both architectures emphasize more on vertical integration and less on horizontal integration. This article proposes the 8C architecture by adding 3C facets into the 5C architecture. The biomimetic specimens were designed and fabricated using 65Mn steel inspired by membrane leaf sheaths. The dominant mechanical deformation at all spindle speeds tends to produce the compressive residual stress. Advances in Mechanical Engineering (AIME) is a JCR Ranked, peer-reviewed, open access journal which publishes a wide range of original research and review articles. Calculating the critical weld nugget size using this model provides results that are consistent with the experimental data to high accuracy. Samples having the substrate surface roughness (0.2 ± 0.05 µm) and the coating thickness of more than 2.83 µm presented relatively better adhesion, wear resistance, and lower coefficient of friction of the TiN coating. The electromagnetic field equation of motor, motive equation of rotor, and circuit equation of winding are solved simultaneously for acquiring dynamical characteristics of motor. Through the analysis of variance, the best process parameters were determined and verified. Nuclear technology Through uniaxial tension–compression fatigue tests, we obtained the S–N curves for specimens under states of original and varying exciting forces. A comprehensive mesh independence study is conducted to ensure that the mesh has no effect on the variation of results. Results revealed that the machined chips exhibited clear saw-tooth profile and were almost segmented at high cutting speeds, and apparent degree of saw-tooth chip morphology occurred as cutting speed increased. Advances in Civil Engineering published special issues feature collections of articles based around a common theme, author or event We are committed to sharing findings related to COVID-19 as quickly as possible.

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