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Online since: February 2019
Authors: Denis Levashkin, Pavel Ogin, Fedor Vasilyev
Mechanical roughing;
3.
Mechanical finishing; 4.
This is significantly affected by the number of re-installations of the part in the working area of the machine during processing.
[10] Yao, Y., Huang, Y., Chen, B., Su, Y., Feng, J., Influence of processing parameters and heat treatment on the mechanical properties of 18Ni300 manufactured by laser based directed energy deposition, Optics and Laser Technology, 105 (2018) 171-179
[13] Harooni, A., Iravani, M., Khajepour, A., Khalifa, A., Gerlich, A.P., Mechanical properties and microstructures in zirconium deposited by injected powder laser additive manufacturing, Additive Manufacturing, 22 (2018) 537-547
Mechanical finishing; 4.
This is significantly affected by the number of re-installations of the part in the working area of the machine during processing.
[10] Yao, Y., Huang, Y., Chen, B., Su, Y., Feng, J., Influence of processing parameters and heat treatment on the mechanical properties of 18Ni300 manufactured by laser based directed energy deposition, Optics and Laser Technology, 105 (2018) 171-179
[13] Harooni, A., Iravani, M., Khajepour, A., Khalifa, A., Gerlich, A.P., Mechanical properties and microstructures in zirconium deposited by injected powder laser additive manufacturing, Additive Manufacturing, 22 (2018) 537-547
Online since: June 2015
Authors: Udayan De, Kriti Ranjan Sahu, Abhijit De
Same factors led to development of quartz crystal oscillator for mass and time measurements.
The mechanical quality factors were at room temperature, closely related to various vibration modes, the values reported for ReCOB crystals are the thickness shear mode. 6.4.
Factors like this and pulse width determine the range and resolution of imaging possible with pulsed ultrasonic.
Their advantages over ferroelectric materials lie in much lower aging and high mechanical quality factors, due to the absence of ferroelectric domains.
ZnO and AIN are non-ferroelectric piezoelectric crystals with a wurtzite type (ZnS) structure [47], and high mechanical quality factors, due to the absence of ferroelectric domains.
The mechanical quality factors were at room temperature, closely related to various vibration modes, the values reported for ReCOB crystals are the thickness shear mode. 6.4.
Factors like this and pulse width determine the range and resolution of imaging possible with pulsed ultrasonic.
Their advantages over ferroelectric materials lie in much lower aging and high mechanical quality factors, due to the absence of ferroelectric domains.
ZnO and AIN are non-ferroelectric piezoelectric crystals with a wurtzite type (ZnS) structure [47], and high mechanical quality factors, due to the absence of ferroelectric domains.
Simulations of Milling Process of Inconel 718 Alloy Based on Three Dimensional Finite Element Models
Online since: September 2014
Authors: Hong Hua Su, Jiu Hua Xu, Jia Bao Fu, Lin Jiang He
This paper presents a 3D coupled thermo-mechanical finite element model based on ABAQUS\Explicit for the simulation of Inconel 718 chip formation in metal cutting.
Introduction Inconel 718 is widely used in many industries, owing to its unique properties such as high oxidation resistance, corrosion resistance even at very high temperatures and retains a high mechanical strength under these conditions.
Indeed, to get an efficient correlation between simulations and experiments, it is necessary to have an accurate prediction of material behavior and a proper contact/friction defines at the interfaces and a precise tool model. 2.1 Material constitutive model The accuracy of the finite element analysis is severely dependent on the accuracy of the material mechanical properties.
Material properties, e.g. stress-strain relationship, are affected by the strain rate and temperature during material forming process with plastic deformation.
The Abaqus/explicit code was inability to predict the correct chip morphology due to a number of factors.
Introduction Inconel 718 is widely used in many industries, owing to its unique properties such as high oxidation resistance, corrosion resistance even at very high temperatures and retains a high mechanical strength under these conditions.
Indeed, to get an efficient correlation between simulations and experiments, it is necessary to have an accurate prediction of material behavior and a proper contact/friction defines at the interfaces and a precise tool model. 2.1 Material constitutive model The accuracy of the finite element analysis is severely dependent on the accuracy of the material mechanical properties.
Material properties, e.g. stress-strain relationship, are affected by the strain rate and temperature during material forming process with plastic deformation.
The Abaqus/explicit code was inability to predict the correct chip morphology due to a number of factors.
Online since: June 2014
Authors: Yang Li, Yu Wang
The rule type is used to distinguish between exact reasoning rules or non-precise reasoning rules and credibility factor is to believe, and did not believe that degree into a number of man-made factors.
Production workers through the human-machine interface set and enter the required production of film or sheet material of Target Properties, so that follow-up reasoning.
[4] Giauque.Expert systems principles and programming [M] Beijing: Mechanical Industry Press, 2006
[10] Zhoudian Ming plastic extrusion process Manual [M] Beijing: Mechanical Industry Press, 2008
[11] Zhou Dianming.Plastic film extrusion [M] Beijing: Mechanical Industry Press, 2012.
Production workers through the human-machine interface set and enter the required production of film or sheet material of Target Properties, so that follow-up reasoning.
[4] Giauque.Expert systems principles and programming [M] Beijing: Mechanical Industry Press, 2006
[10] Zhoudian Ming plastic extrusion process Manual [M] Beijing: Mechanical Industry Press, 2008
[11] Zhou Dianming.Plastic film extrusion [M] Beijing: Mechanical Industry Press, 2012.
Online since: November 2012
Authors: Jun Qing Liu, Jun Jie Xi, Hong Yu Liu
It is a complex of all principles of technique, economy and environmental harmony.
3.1 The Technique Principle of Material Selection
Material technique includes physical properties, mechanics properties and chemical properties.
Physical properties include density and electrothermal conductivity.
Chemical properties include oxidation resistance and corrosion resistance.
The quantificational mechanical property muster of material is φ.
The mechanical property constraint conditions are shown in formula (8).
Physical properties include density and electrothermal conductivity.
Chemical properties include oxidation resistance and corrosion resistance.
The quantificational mechanical property muster of material is φ.
The mechanical property constraint conditions are shown in formula (8).
Online since: August 2014
Authors: Tie Ying Li, Jian Long Han, Qing Fang Niu, Guan Feng Qiao
Simulation in Abaqus
2.1 Selecting Joints of Beam-Column
Due to different types of joints in the pagoda, its mechanical properties are bound to differ.
Different vertical loads will affect the performance of the joint of beam-column.
Mechanical properties of Northeast China larch are listed in Table 2.
While other properties is shown in Abaqus.
Yamada, Studies on Rheological Properties of Wood and Structure of Cell Wall, Mokuzai Gakkaishi 17 (2) (1971) 36-43.
Different vertical loads will affect the performance of the joint of beam-column.
Mechanical properties of Northeast China larch are listed in Table 2.
While other properties is shown in Abaqus.
Yamada, Studies on Rheological Properties of Wood and Structure of Cell Wall, Mokuzai Gakkaishi 17 (2) (1971) 36-43.
Online since: December 2018
Authors: Yasunobu Miyazaki, Shinji Kodama, Seiji Furusako, Masanori Yasuyama
Through a detailed observation or analysis on the fracture surfaces of welds after the press-peel test, it was attempted to clarify dominant factors of the maximum load of the projection-welded joints.
Mechanical properties and chemical compositions of the steel used in this study.
This result reveals that the weld area is not the most dominant factor that affects the maximum load.
The electrode force was the most dominant factor that affects the maximum load of the joints. 2.
[3] Qu Yan and Katsuji Nakashima, “Study on Joint Properties of l470MPa Grade Die-quenched Steel Sheet and Weldnut”, Preprints of the National Meeting of JWS, No. 71, pp.452-453 (in Japanese)
Mechanical properties and chemical compositions of the steel used in this study.
This result reveals that the weld area is not the most dominant factor that affects the maximum load.
The electrode force was the most dominant factor that affects the maximum load of the joints. 2.
[3] Qu Yan and Katsuji Nakashima, “Study on Joint Properties of l470MPa Grade Die-quenched Steel Sheet and Weldnut”, Preprints of the National Meeting of JWS, No. 71, pp.452-453 (in Japanese)
Online since: January 2022
Authors: Oumayma Bahou, Brahim Ismail, Naima Belayachi
It is a mixture of plant aggregates (straw fibers) with a lime binder and additives of natural origin (Ismail et al., 2020)
Straw biocomposite may have very interesting thermal properties (Belayachi et al., 2013) but its mechanical properties are low due to its low proportion of binder and the low fiber-binder bond, which makes it more vulnerable to external attacks, whether mechanical or climatic.
Tab. 1: Mixture proportions (by mass) and biocomposites properties Formulation W/L S/L AE/L C/L BP/L Density (Kg/m3) Porosity (%) Vapour diffusion factor SBLAP 1,1 0,3 0,05 0,025 - 312 79 8,35 SBLBP 1,1 0,4 - - 0,2 294 - 8,45 RC 1,1 0,2 - - - 450 74 - W: water, L: lime, S: Straw, AE: air entraining agent, C: casein protein, BP: biopolymer - Protection coating For the protective coatings, lime-based mortars with optimal formulations in terms of mechanical strength and thermal performance were used (Brahim Ismail, 2020).
Tab. 2: Mixture proportions of protective coatings (by mass) and material properties Mortar W/L S/L AE/L C/L Density (Kg/m3) Porosity (%) Vapour Diffusion factor OPT 0,55 - 0,05 0,025 1080 66 6,72 OPTF 0,825 0,075 0,05 0,025 794 68 8,35 W: water, L: lime, S: Straw, AE: air entraining agent, C: casein protein 2.2 Samples preparation The preparation of the study samples begins with the preparation of biocomposite substrates measuring 30x30x10 cm3.
· Aging cycles with salt caused a huge degradation to the system with fiber mortar (OPTF) which showed a significant development of cracks and a decrease in mechanical strength.
Thermo-mechanical behaviour of an innovant straw lime composite for thermal applications.
Tab. 1: Mixture proportions (by mass) and biocomposites properties Formulation W/L S/L AE/L C/L BP/L Density (Kg/m3) Porosity (%) Vapour diffusion factor SBLAP 1,1 0,3 0,05 0,025 - 312 79 8,35 SBLBP 1,1 0,4 - - 0,2 294 - 8,45 RC 1,1 0,2 - - - 450 74 - W: water, L: lime, S: Straw, AE: air entraining agent, C: casein protein, BP: biopolymer - Protection coating For the protective coatings, lime-based mortars with optimal formulations in terms of mechanical strength and thermal performance were used (Brahim Ismail, 2020).
Tab. 2: Mixture proportions of protective coatings (by mass) and material properties Mortar W/L S/L AE/L C/L Density (Kg/m3) Porosity (%) Vapour Diffusion factor OPT 0,55 - 0,05 0,025 1080 66 6,72 OPTF 0,825 0,075 0,05 0,025 794 68 8,35 W: water, L: lime, S: Straw, AE: air entraining agent, C: casein protein 2.2 Samples preparation The preparation of the study samples begins with the preparation of biocomposite substrates measuring 30x30x10 cm3.
· Aging cycles with salt caused a huge degradation to the system with fiber mortar (OPTF) which showed a significant development of cracks and a decrease in mechanical strength.
Thermo-mechanical behaviour of an innovant straw lime composite for thermal applications.
Online since: September 2016
Authors: Thomaz E.T. Buttignol, Matteo Colombo, Marco di Prisco
SFRC properties
The SFRC concrete mix design is shown in Table 1.
Concrete mechanical properties at 28 days were obtained from [11], assuming that concrete residual strength is equal to the one at hot condition.
In general, a better prediction was achieved with the introduction of the reduction factor.
[11] Hager, I., Thermal behavior of high performance concretes at high temperature - evolution of mechanical properties, (PhD Thesis) l’Ecole Nationale des Ponts et Chaussées, 2005
[13] Colombo, M.; di Prisco, M. and Felicetti, R.: Mechanical properties of steel fibre reinforced concrete exposed at high temperatures.
Concrete mechanical properties at 28 days were obtained from [11], assuming that concrete residual strength is equal to the one at hot condition.
In general, a better prediction was achieved with the introduction of the reduction factor.
[11] Hager, I., Thermal behavior of high performance concretes at high temperature - evolution of mechanical properties, (PhD Thesis) l’Ecole Nationale des Ponts et Chaussées, 2005
[13] Colombo, M.; di Prisco, M. and Felicetti, R.: Mechanical properties of steel fibre reinforced concrete exposed at high temperatures.
Online since: October 2011
Authors: In Wook Hwang, Bong Chul Kwon, Soo Tae Kim, Young Hyu Choi, Sung Hyun Jang
and are scale factors to normalize magnitude.
and are weighting factors for the first and the second terms in the penalty function.
Material properties of Al 2219 alloy are as followings; density (2,800 kg/m3), modulus of elasticity (72 GPa), Poisson’s ratio (0.27), ultimate strength in tension (440 MPa), and yield strength in tension (360 MPa).
Deck unit is not affected by the vehicle loads.
Also, weighting factors,and , are evenly 1.
and are weighting factors for the first and the second terms in the penalty function.
Material properties of Al 2219 alloy are as followings; density (2,800 kg/m3), modulus of elasticity (72 GPa), Poisson’s ratio (0.27), ultimate strength in tension (440 MPa), and yield strength in tension (360 MPa).
Deck unit is not affected by the vehicle loads.
Also, weighting factors,and , are evenly 1.