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Online since: February 2012
Authors: Ki Hong Shin, Sang Kwon Lee, Hong Jun Yang
On the Practical Consideration of Source Localization Using the Location Template Matching (LTM) with Multiple Sensors
Hong Jun Yang1,a, Sang Kwon Lee1,*,b and Ki Hong Shin2,*,c
1 Department of Mechanical Engineering Inha University, Incheon, South Korea
2 Department of Mechanical & Automotive Engineering, Andong University, Andong, South Korea.
On the other hand, the LTM method does not depend on the material property, i.e., it does not require to have knowledge on the structure whether it is isotropic or anisotropic.
Thus, in this section, we first summarize the basic property of the time reversal acoustics.
And the bandwidth of the signals and the length of signal are also found to be important factors for the LTM method.
Theoretically, the frequency bandwidth does not affect on the estimation of correlation coefficient if there is no noise.
On the other hand, the LTM method does not depend on the material property, i.e., it does not require to have knowledge on the structure whether it is isotropic or anisotropic.
Thus, in this section, we first summarize the basic property of the time reversal acoustics.
And the bandwidth of the signals and the length of signal are also found to be important factors for the LTM method.
Theoretically, the frequency bandwidth does not affect on the estimation of correlation coefficient if there is no noise.
Online since: August 2022
Authors: Yasir Nawab, Muhammad Shahid, Arif Ali Shah, Naveed Ahmed Siddiqui
The modulus ratio between the core and the wrap is one of the main factors of higher NPR value.
I. microstructure and mechanical properties.
Mechanical Properties, Polymer Engineering and Science 40 (2000) 1906–1914
Evans, Novel tensile properties of helical auxetic structures: a numerical Study.
Evans, Geometry, manufacture & Properties of HAY.
I. microstructure and mechanical properties.
Mechanical Properties, Polymer Engineering and Science 40 (2000) 1906–1914
Evans, Novel tensile properties of helical auxetic structures: a numerical Study.
Evans, Geometry, manufacture & Properties of HAY.
Online since: July 2012
Authors: Shun Gang Hua, Li Na Zhang, Jun Hua Zeng
The structural performance of body directly affects the security and mobility of vehicle.
It is necessary to do modal analysis of the vehicle body for investigating its dynamic properties under vibration excitation.
From the modal analysis of the body, several files can be got including the modal analysis result, the material properties of the body, the element matrix and interface nodes.
In this paper, considering various factors, the beam layout under the top surface of the hull is adjusted according to the topology optimization density contour to strengthen the body structural stiffness.
So the beam layout optimization doesn’t destroy natural properties of the body.
It is necessary to do modal analysis of the vehicle body for investigating its dynamic properties under vibration excitation.
From the modal analysis of the body, several files can be got including the modal analysis result, the material properties of the body, the element matrix and interface nodes.
In this paper, considering various factors, the beam layout under the top surface of the hull is adjusted according to the topology optimization density contour to strengthen the body structural stiffness.
So the beam layout optimization doesn’t destroy natural properties of the body.
Online since: March 2007
Authors: Nuri Akdut, B. Soenen, P. Antoine
Indeed, SSA in austenitic stainless steel affects mainly in α'-martensite.
However, it has been recently recognized that an additional static aging treatment at low temperatures on cold rolled metastable austenitic stainless steels containing α'-martensite is responsible for significant changes in mechanical properties, like yield strength and total elongation [4].
In this paper, the SSA in three different stainless steel grades, i.e. 301LN, 304L and 316L, is investigated and the value of their mechanical properties is optimized by a combination of the cold rolling degree, the martensite volume fraction and the time-temperature variables of the aging treatment.
Moreover, the base materials with a so-called 2B finish, which are fully austenitic, do not reveal any SSA effect on the mechanical properties within the range of time and temperature investigated in this study.
The way by which martensite is formed plays an important role on the mechanical properties.
However, it has been recently recognized that an additional static aging treatment at low temperatures on cold rolled metastable austenitic stainless steels containing α'-martensite is responsible for significant changes in mechanical properties, like yield strength and total elongation [4].
In this paper, the SSA in three different stainless steel grades, i.e. 301LN, 304L and 316L, is investigated and the value of their mechanical properties is optimized by a combination of the cold rolling degree, the martensite volume fraction and the time-temperature variables of the aging treatment.
Moreover, the base materials with a so-called 2B finish, which are fully austenitic, do not reveal any SSA effect on the mechanical properties within the range of time and temperature investigated in this study.
The way by which martensite is formed plays an important role on the mechanical properties.
Online since: August 2011
Authors: S.R. Dhakate, N. Chauhan, S. Sharma, R.B. Mathur
Mechanical cleavage of graphite originally led to the discovery of Gr-sheets [1].
On the other hand, hydrophobic property of as-synthesized Gr is limited for developing its applications.
Moreover, Gr-oxide prepared from oxidized graphite possesses lattice defects which degrade the unique electronic properties, compared with pristine Gr [7].
It is evident that with increase in concentration of EG in DMF, the factors like overlapping, thickness, area of Gr-sheets gets affected.
Dujardin, Production, properties and potential of graphene, Carbon 48 (2010) 2127-2150
On the other hand, hydrophobic property of as-synthesized Gr is limited for developing its applications.
Moreover, Gr-oxide prepared from oxidized graphite possesses lattice defects which degrade the unique electronic properties, compared with pristine Gr [7].
It is evident that with increase in concentration of EG in DMF, the factors like overlapping, thickness, area of Gr-sheets gets affected.
Dujardin, Production, properties and potential of graphene, Carbon 48 (2010) 2127-2150
Online since: October 2014
Authors: Intan Syaffinazzilla Zaine, N.A.M. Napiah, Siti Hajar Khalid, Azmi Mohamad Yusof, A.N. Alias, A.M.M. Ali
Khalid1,d
1Department of Applied Sciences, Universiti Teknologi MARA Malaysia, 13500, Permatang Pauh, Pulau Pinang, Malaysia
2Faculty of Mechanical Engineering, Universiti Teknologi MARA Malaysia, 13500, Permatang Pauh, Pulau Pinang, Malaysia
3Faculty of Applied Sciences, Universiti Teknologi MARA Malaysia, 40450, Shah Alam, Selangor, Malaysia
aintan.zaine@ppinang.uitm.edu.my, bnoorezal113@ppinang.uitm.edu.my, cazmi349@ppinang.uitm.edu.my, dsitihajar057@ppinang.uitm.edu.my
Keywords: Dispersion, functionalized, MWCNTs, Raman spectroscopy, UV-Vis spectroscopy.
This nature restricts their dispersion into desired surfactant and become one of the factors that decreased the unique properties of MWCNTs.
Comparing with a-MWCNTs, the morphology of f-MWCNTs seems affected by oxidation process especially for smaller nanotubes due to the introduction of structural defects at the outer sidewall.
Naseh, “A comparison of effects of plasma and acid functionalizations on structure and electrical property of multi-wall carbon nanotubes,” Appl.
Li, “Mechanical properties of cyanate ester/epoxy nanocomposites modified with plasma functionalized MWCNTs,” Compos.
This nature restricts their dispersion into desired surfactant and become one of the factors that decreased the unique properties of MWCNTs.
Comparing with a-MWCNTs, the morphology of f-MWCNTs seems affected by oxidation process especially for smaller nanotubes due to the introduction of structural defects at the outer sidewall.
Naseh, “A comparison of effects of plasma and acid functionalizations on structure and electrical property of multi-wall carbon nanotubes,” Appl.
Li, “Mechanical properties of cyanate ester/epoxy nanocomposites modified with plasma functionalized MWCNTs,” Compos.
Online since: August 2014
Authors: Kiet Tieu, Cheng Lu, Andrii G. Kostryzhev, Turbadrakh Chuluunbat
The Acoustic Emission (AE) monitoring technique is widely used in mechanical and material research for detection of plastic deformation, fracture initiation and crack growth.
It is shown that the strain rate and the presence of a crack (modeled by a notch on the sample), affect the fracture mode (brittle or ductile) and a relative amount of the mode dependent AE signatures.
Some authors studied the relationship between AE features (such as signal amplitude, frequency, energy and duration) and mechanical parameters (load, stress and crack growth) during tensile deformation of notched or plain specimens [8-11].
AE sources Factors AE waveform parameters Ref Amplitude Frequency Duration Rise time Count Waveform Fracture modes Ductile fracture Low Low Long Low Low Continuous signal [3] Brittle fracture High High Short High High Burst signal Material behavior Plastic deformation Low low long Low - Continuous signal [8] Crack initiation and propagation High High Short High - Burst signal [3] [10] Crack type Tensile mode-I High High Short high Longitudinal [1] Shear mode-II Low low long low Shear wave Strain rate effect High Strain rate High - - - - - [8] [11] Low strain rate Low - - - - - Experimental procedure Fig. 1 The geometry of single edge notched specimen Tensile testing.
The GTN constitutive model can describe the influence of voids on the plasticity properties of a metal and can be incorporated in the finite element analysis to simulate the tensile behavior of an aluminum alloy specimen [14].
It is shown that the strain rate and the presence of a crack (modeled by a notch on the sample), affect the fracture mode (brittle or ductile) and a relative amount of the mode dependent AE signatures.
Some authors studied the relationship between AE features (such as signal amplitude, frequency, energy and duration) and mechanical parameters (load, stress and crack growth) during tensile deformation of notched or plain specimens [8-11].
AE sources Factors AE waveform parameters Ref Amplitude Frequency Duration Rise time Count Waveform Fracture modes Ductile fracture Low Low Long Low Low Continuous signal [3] Brittle fracture High High Short High High Burst signal Material behavior Plastic deformation Low low long Low - Continuous signal [8] Crack initiation and propagation High High Short High - Burst signal [3] [10] Crack type Tensile mode-I High High Short high Longitudinal [1] Shear mode-II Low low long low Shear wave Strain rate effect High Strain rate High - - - - - [8] [11] Low strain rate Low - - - - - Experimental procedure Fig. 1 The geometry of single edge notched specimen Tensile testing.
The GTN constitutive model can describe the influence of voids on the plasticity properties of a metal and can be incorporated in the finite element analysis to simulate the tensile behavior of an aluminum alloy specimen [14].
Online since: October 2023
Authors: Jan Valentin, Yong Wang, Alfonso Arevalillo Roman, Juan Antonio Ferriz-Papi
Variable composition and characteristics undermine customers’ confidence who prefers primary materials with certified properties and at more competitive value/cost.
Subcontracting is another detrimental factor.
RECONMATIC Vision and Objectives Ajayi et al [19] identifies five main factors to be changed in the construction industry in the UK: ‘make-do for waste’ general understanding; non-collaborative culture between stakeholders involved in the waste value chain; preventive responsibilities shifted between designers and contractors; belief in waste inevitability; and conservatism, not allowing innovation.
These solutions permeate through the four main intervention stages of CDW management (design and construction; use and end of life; off-site sorting and logistics; and new materials derived from CDW) and generic issues affecting the whole waste value chain (i.e. traceability and assessment, training and dissemination).
Martinho, "Influence of construction company size on the determining factors for construction and demolition waste management," Waste Management, vol. 136, pp. 295-302, 2021
Subcontracting is another detrimental factor.
RECONMATIC Vision and Objectives Ajayi et al [19] identifies five main factors to be changed in the construction industry in the UK: ‘make-do for waste’ general understanding; non-collaborative culture between stakeholders involved in the waste value chain; preventive responsibilities shifted between designers and contractors; belief in waste inevitability; and conservatism, not allowing innovation.
These solutions permeate through the four main intervention stages of CDW management (design and construction; use and end of life; off-site sorting and logistics; and new materials derived from CDW) and generic issues affecting the whole waste value chain (i.e. traceability and assessment, training and dissemination).
Martinho, "Influence of construction company size on the determining factors for construction and demolition waste management," Waste Management, vol. 136, pp. 295-302, 2021
Online since: March 2022
Authors: Yu Feng Sun, Jia Fei Wang, Ting Chun Hu, Yi Yun Xi
The external temperature load is the most significant factor affecting the film temperature sensor.
Since the membrane structure is greatly affected by the blade base, the stress on the blade can be equivalent to the stress in the membrane structure, and then the value can be corrected by simulation.
Size parameters Material Length Width Thickness SiO2 80[mm] 5[mm] 1[μm] NiCr/NiSi 0.3[ μm] SiO2 2[ μm] Ta2O5 0.5[ μm] Al2O3 1[ μm] NiCrAlY 1[ μm] Alloy substrate 100[mm] 50[mm] 10[ μm] The properties of various materials used in the model are shown in Table 2: Table 2.
Material properties Material Thermal expansion coefficient [10-6·K-1] Density [kg·m-3] Elastic Modulus [Gpa ] Poisson's ratio Alloy substrate 14.90 8540 144 0.27 NiCrAlY 12.70 8180 206.8 0.21 Al2O3 8.60 3965 400 0.22 Ta2O5 3.60 8400 140 0.23 SiO2 0.50 2500 73 0.20 NiCr 17.0 8100 206 0.30 ANSYS workbench is used for modeling.
Electro-Mechanical Engineering, 2018, 34(01):1-7
Since the membrane structure is greatly affected by the blade base, the stress on the blade can be equivalent to the stress in the membrane structure, and then the value can be corrected by simulation.
Size parameters Material Length Width Thickness SiO2 80[mm] 5[mm] 1[μm] NiCr/NiSi 0.3[ μm] SiO2 2[ μm] Ta2O5 0.5[ μm] Al2O3 1[ μm] NiCrAlY 1[ μm] Alloy substrate 100[mm] 50[mm] 10[ μm] The properties of various materials used in the model are shown in Table 2: Table 2.
Material properties Material Thermal expansion coefficient [10-6·K-1] Density [kg·m-3] Elastic Modulus [Gpa ] Poisson's ratio Alloy substrate 14.90 8540 144 0.27 NiCrAlY 12.70 8180 206.8 0.21 Al2O3 8.60 3965 400 0.22 Ta2O5 3.60 8400 140 0.23 SiO2 0.50 2500 73 0.20 NiCr 17.0 8100 206 0.30 ANSYS workbench is used for modeling.
Electro-Mechanical Engineering, 2018, 34(01):1-7
Online since: January 2026
Authors: Hiromi Nagaumi, Shun Cun Luo, Jia Song, Xia Ming Chen, Wei Zhu, Xiao Juan Fan
Aluminum components are increasingly employed in lightweight automotive structures, yet their distinct thermal and physical properties exacerbate welding-induced distortions compared to steel components.
The temperature-dependent material properties, such as thermal conductivity, thermal expansion coefficient and flow curve, were measured for the tested AlMgSi-sheet and inputted into the FE-model.
Additionally, the plastic deformation near the weld seam (WS) is influenced by the overall stress and can, in turn, affect it reciprocally.
The results revealed a prominent peak of 180 MPa in the WS region and two smaller peaks in the left and right heat-affected zones (HAZL/R).
Withers, Global mechanical tensioning for the management of residual stresses in welds, Mater.
The temperature-dependent material properties, such as thermal conductivity, thermal expansion coefficient and flow curve, were measured for the tested AlMgSi-sheet and inputted into the FE-model.
Additionally, the plastic deformation near the weld seam (WS) is influenced by the overall stress and can, in turn, affect it reciprocally.
The results revealed a prominent peak of 180 MPa in the WS region and two smaller peaks in the left and right heat-affected zones (HAZL/R).
Withers, Global mechanical tensioning for the management of residual stresses in welds, Mater.