Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: September 2013
Authors: Tomaž Pazlar
The choice of the levels of reliability for a particular structure should take into account of several relevant factors including aspects of design working life, durability and quality assurance.
The approach of structural reliability is based on the semi-probabilistic method: limit-state performance design and partial factors method.
Summer storm on 23rd of August affected the northern part of the Ljubljana basin, Styria and some parts in east Slovenia.
We were not successful at obtaining information form the insurance companies, since they required written authorization letters form the property owners.
After taking into account the key factors – the characteristics of the atmosphere, facility location, terrain, height of buildings, etc. – the reference wind pressure as calculation load on structure can be calculated.
The approach of structural reliability is based on the semi-probabilistic method: limit-state performance design and partial factors method.
Summer storm on 23rd of August affected the northern part of the Ljubljana basin, Styria and some parts in east Slovenia.
We were not successful at obtaining information form the insurance companies, since they required written authorization letters form the property owners.
After taking into account the key factors – the characteristics of the atmosphere, facility location, terrain, height of buildings, etc. – the reference wind pressure as calculation load on structure can be calculated.
Online since: August 2025
Authors: Gusti Umindya Nur Tajalla, Nia Sasria, Ratna Eka Meliana Putri
In general, bioplastic degradation refers to internal and external factors.
Internal factors include chemical properties (polymer composition and chemical additives) and physical properties (molecular weight, hydrophilicity, morphology).
External factors depend on environmental factors, such as temperature, humidity, pH, etc [27].
Triawan, Mechanical and biodegradation properties of cornstarch-based bioplastic material, Mater.
Razman, Mechanical properties of oil palm fibre-reinforced polymer composites: a review, JMR&T. 17 (2022) 33-65
Internal factors include chemical properties (polymer composition and chemical additives) and physical properties (molecular weight, hydrophilicity, morphology).
External factors depend on environmental factors, such as temperature, humidity, pH, etc [27].
Triawan, Mechanical and biodegradation properties of cornstarch-based bioplastic material, Mater.
Razman, Mechanical properties of oil palm fibre-reinforced polymer composites: a review, JMR&T. 17 (2022) 33-65
Online since: July 2017
Authors: Ilvina Gamirovna Khusnutdinova, Musa Gumerovich Bashirov
In the process of equipment operation under the action of overpressure, mechanical loads, thermal stress and other factors there comes accumulation of fatigue damage to buildings and metal structural elements that leads to adverse processes resulting in serious failures which negatively affect industrial fire safety.
Currently, to estimate the ruggedness of structural elements, to evaluate the health of long-operated technological equipment and to extend the lifecycle of equipment with the designated period of safe operation, the methods are implemented that do not take into account real changes in the structure and mechanical properties of structural materials in operation.
To assess real changes in the mechanical properties of constructional materials and their structure and to determine the actual technical condition and the remaining safe life of structural elements of processing equipment an electromagnetic-acoustical (EMA) method is proposed to be used.
In accordance with the results, it was proposed to use the transfer function of the system "unit under test – electromagnetic-acoustical transducer” in order to give an integrated assessment of changes in mechanical, acoustical and electrophysical properties of metal samples in the process of changing a strain-stress state and damage accumulation.
It was proposed to use a transfer function of the system "unit under test – electromagnetic- acoustical transducer" to assess the change of mechanical, acoustical and electrical properties of metal samples when changing the stress-strain state and damage accumulation.
Currently, to estimate the ruggedness of structural elements, to evaluate the health of long-operated technological equipment and to extend the lifecycle of equipment with the designated period of safe operation, the methods are implemented that do not take into account real changes in the structure and mechanical properties of structural materials in operation.
To assess real changes in the mechanical properties of constructional materials and their structure and to determine the actual technical condition and the remaining safe life of structural elements of processing equipment an electromagnetic-acoustical (EMA) method is proposed to be used.
In accordance with the results, it was proposed to use the transfer function of the system "unit under test – electromagnetic-acoustical transducer” in order to give an integrated assessment of changes in mechanical, acoustical and electrophysical properties of metal samples in the process of changing a strain-stress state and damage accumulation.
It was proposed to use a transfer function of the system "unit under test – electromagnetic- acoustical transducer" to assess the change of mechanical, acoustical and electrical properties of metal samples when changing the stress-strain state and damage accumulation.
Online since: January 2007
Authors: Mario Rosso, Radu L. Orban, Mariana Lucaci, Marco Actis Grande
These are all important factors for assuring
the coating layer oxidation and corrosion resistance.
Introduction Owing to its outstanding properties of oxidation and corrosion resistance at both ambient and elevated temperatures, as determined by the ability to form compact, very adherent, Al-rich oxide scales, NiAl is widely applied to high oxidation and corrosion resistant coatings realization.
In sum, NiAl coating is a very cost effective mean to assure the oxidation and corrosion resistance of the surface while mechanical properties of the underlying substrate are maintained.
However, it is difficult to apply it due to the above-mentioned Al2O3 scale formed at high melting point and low diffusivity which may affect the coating adherence to the substrate.
Introduction Owing to its outstanding properties of oxidation and corrosion resistance at both ambient and elevated temperatures, as determined by the ability to form compact, very adherent, Al-rich oxide scales, NiAl is widely applied to high oxidation and corrosion resistant coatings realization.
In sum, NiAl coating is a very cost effective mean to assure the oxidation and corrosion resistance of the surface while mechanical properties of the underlying substrate are maintained.
However, it is difficult to apply it due to the above-mentioned Al2O3 scale formed at high melting point and low diffusivity which may affect the coating adherence to the substrate.
Online since: October 2012
Authors: Chun Hui Chung
Abrasive Distribution of the Fixed Diamond Wire in Wire Sawing Process
Chunhui Chung
Department of Mechanical Engineering,
National Taiwan University of Science and Technology,
No.43, Sec. 4, Keelung Rd., Taipei, 106, Taiwan
chunhui.chung@mail.ntust.edu.tw
Keywords: Diamond wire saw; wafering; silicon wafer
Abstract.
The flexibility of the wire will affect the performance of the slicing process such as the loading on the abrasives and the material removal rate.
Fig. 4 Analysis of wire tension around an abrasive grit Simulation Results TABLE I Mechanical properties of the silicon in the simulation [9, 10] Young’s Modulus Hardness Fracture Toughness E = 127 GPa H = 10 GPa Kc = 0.7 MPa The mechanical properties of the silicon utilized in this study are listed in Table 1.
However, the results show that the abrasive interval does not affect the wire tension at exit significantly.
Therefore, the abrasive interval is an important factor which affects the slicing performance manifoldly.
The flexibility of the wire will affect the performance of the slicing process such as the loading on the abrasives and the material removal rate.
Fig. 4 Analysis of wire tension around an abrasive grit Simulation Results TABLE I Mechanical properties of the silicon in the simulation [9, 10] Young’s Modulus Hardness Fracture Toughness E = 127 GPa H = 10 GPa Kc = 0.7 MPa The mechanical properties of the silicon utilized in this study are listed in Table 1.
However, the results show that the abrasive interval does not affect the wire tension at exit significantly.
Therefore, the abrasive interval is an important factor which affects the slicing performance manifoldly.
Online since: January 2012
Authors: Robert Schaller, Daniele Mari, Iva Tkalcec-Vaju
The variation of the Au:Ag:Cu ratio results in alloys of very different colour and mechanical properties [1].
Mechanical spectroscopy has proven to be a very sensitive tool for studying phase transformations in gold alloys.
In the white gold alloys, the precipitation affects the peak attributed to the grain boundaries [4].
The material’s hardness is not affected by the phase decomposition, within the precision of the measurement.
In the 14-carat alloy, the phase decomposition into a copper-rich and a silver-rich phase influences the anelastic properties.
Mechanical spectroscopy has proven to be a very sensitive tool for studying phase transformations in gold alloys.
In the white gold alloys, the precipitation affects the peak attributed to the grain boundaries [4].
The material’s hardness is not affected by the phase decomposition, within the precision of the measurement.
In the 14-carat alloy, the phase decomposition into a copper-rich and a silver-rich phase influences the anelastic properties.
Online since: June 2021
Authors: Zhi Bo Sheng, Ling Zheng Wu, Wen Liang Jin, Shen You Song Jin, Chen Kang Wang
As its fascinating mechanical, chemical, optical, thermal and electrical properties, graphene offers utility in sensors, batteries, transistors and catalysis applications [18-20].
The effect factors including initial lead ion concentration, pH, contact time and temperature on lead adsorption by FGN were discussed.
The lead ions adsorption equilibrium and kinetic properties of FGN were determined through batch adsorption tests.
The existence of stability and controllable changes oxygenic functional groups on the surface of FGN is a key factor in determining the equilibrium adsorption capacity of heavy metals, but also affected by solution system pH, temperature and other factors.
Ruoff, Graphene and graphene oxide: synthesis, properties, and applications, Adv Mater, 22(2010) 3906-3924
The effect factors including initial lead ion concentration, pH, contact time and temperature on lead adsorption by FGN were discussed.
The lead ions adsorption equilibrium and kinetic properties of FGN were determined through batch adsorption tests.
The existence of stability and controllable changes oxygenic functional groups on the surface of FGN is a key factor in determining the equilibrium adsorption capacity of heavy metals, but also affected by solution system pH, temperature and other factors.
Ruoff, Graphene and graphene oxide: synthesis, properties, and applications, Adv Mater, 22(2010) 3906-3924
Online since: December 2011
Authors: Dong Kyu Kim, Yong Taek Im, K.H. Jung, H.W. Lee
Im1,d
1Dept. of Mechanical Engineering, KAIST, Daejeon, Republic of Korea
2Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
aall03@kaist.ac.kr, bpotential80@kaist.ac.kr, ch.lee@mpie.de, dytim@kaist.ac.kr
Keywords: recrystallization, IF steel, simulation, curvature-driven pressure, texture.
It was found that local interface migration of protrusions/retrusions of recrystallization fronts could significantly affect the kinetics, grain morphology and annealing texture according to the present investigation.
Introduction In automobile industry, prediction of anisotropic property of interstitial free (IF) steel sheet is of great interest.
In this context, local interface migration of protrusions/retrusions of recrystallization fronts could affect recrystallization kinetics and textural evolution as a significant factor of oriented growth.
The material parameters [5] used in simulations are 69.2 [GPa] for shear modulus; 2.48 [Å] for burgers vector; 0.79 [J/m2] for the high angle grain boundary specific energy; 9.74810-1 [m3/Ns] for the pre-exponential factor of the mobility and 3.9 [eV] for the activation energy of grain boundary mobility.
It was found that local interface migration of protrusions/retrusions of recrystallization fronts could significantly affect the kinetics, grain morphology and annealing texture according to the present investigation.
Introduction In automobile industry, prediction of anisotropic property of interstitial free (IF) steel sheet is of great interest.
In this context, local interface migration of protrusions/retrusions of recrystallization fronts could affect recrystallization kinetics and textural evolution as a significant factor of oriented growth.
The material parameters [5] used in simulations are 69.2 [GPa] for shear modulus; 2.48 [Å] for burgers vector; 0.79 [J/m2] for the high angle grain boundary specific energy; 9.74810-1 [m3/Ns] for the pre-exponential factor of the mobility and 3.9 [eV] for the activation energy of grain boundary mobility.
Online since: August 2015
Authors: Hajo Dieringa, Norbert Hort, Karl Ulrich Kainer, Börn Wiese
The flux contamination of melts during casting can negatively affect mechanical properties as well as corrosion behaviour.
However, in amounts > 10 ppm, Be coarsens the microstructure of Mg castings and deteriorates mechanical properties [4,6].
But Ca is also an effective alloying element that influences mechanical properties, corrosion behaviour etc.
However, while Ca is well known to improve properties of some creep resistant alloys, it also causes problems with castability in high pressure die casting when used in the range of 2%.
You, Key factor influencing the ignition resistance of magnesium alloys at elevated temperatures: Scripta Materialia, (2011) 958 – 961
However, in amounts > 10 ppm, Be coarsens the microstructure of Mg castings and deteriorates mechanical properties [4,6].
But Ca is also an effective alloying element that influences mechanical properties, corrosion behaviour etc.
However, while Ca is well known to improve properties of some creep resistant alloys, it also causes problems with castability in high pressure die casting when used in the range of 2%.
You, Key factor influencing the ignition resistance of magnesium alloys at elevated temperatures: Scripta Materialia, (2011) 958 – 961
Online since: September 2015
Authors: M.S. Alajmi, S.E. Oraby
As indicated by most relevant investigations, temperatures in metal cutting affect both the shear properties of the work material and, cutting edge.
Trent and Wright [10] explained that the cutting forces or power consumptions were not affected by the temperature near the cutting vicinity.
Zorev [8] also found that the maximum temperature at the end of the chip formation zone was not high enough to cause a considerable reduction in the mechanical properties of plain and alloyed steel.
Moreover, Altintas [11] claimed that cutting temperatures could not be considered as a significant factor either in the cutting mechanics or on the dynamic stability and structural errors of the machining system.
Artozoul, et al: Extended infrared thermography applied to orthogonal cutting; mechanical and thermal aspects (Applied Thermal Engineering (2014))
Trent and Wright [10] explained that the cutting forces or power consumptions were not affected by the temperature near the cutting vicinity.
Zorev [8] also found that the maximum temperature at the end of the chip formation zone was not high enough to cause a considerable reduction in the mechanical properties of plain and alloyed steel.
Moreover, Altintas [11] claimed that cutting temperatures could not be considered as a significant factor either in the cutting mechanics or on the dynamic stability and structural errors of the machining system.
Artozoul, et al: Extended infrared thermography applied to orthogonal cutting; mechanical and thermal aspects (Applied Thermal Engineering (2014))