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Online since: September 2005
Authors: P.R. Cunningham, Janice M. Dulieu-Barton, T.R. Emery
UK.
3
Smiths Aerospace Mechanical Systems-Aerostructures, Hamble-le-Rice.
This is related to the stress as follows: SA P P '=+ ) ( 22221111 ασασ (2) Where S is the thermoelastic signal and A' is a calibration constant based on the detector properties and material properties as follows [2] n p eT RCZF A 03β ρ ' =' (3) where Z is the detector responsivity, F is an amplification factor that includes the resolution of the analogue to digital convertor, b' is a constant for photo detectors, e is the emissivity, T0 is the absolute temperature prior to any heating due to damage evolution, n is a constant dependent on the detector properties and its operating wavelength and R is a temperature correction factor is defined as: n DT T R = 0 (4) where TD represents the increased specimen absolute temperature as a result of damage.
Clearly from equation (3) increases in temperature of this magnitude will affect the thermoelastic signal and it is necessary to apply the temperature correction factor, R.
The maximum stress, assuming a stress concentration factor of 3, of approximately 450 MPa was not considered great enough to cause gross fibre breakage.
Vol. 12 (1989), p. 291 [10] Drew, R.C. and White, R.G: An investigation into damage propagation and its effect upon dynamic properties of CFRP composite materials.
This is related to the stress as follows: SA P P '=+ ) ( 22221111 ασασ (2) Where S is the thermoelastic signal and A' is a calibration constant based on the detector properties and material properties as follows [2] n p eT RCZF A 03β ρ ' =' (3) where Z is the detector responsivity, F is an amplification factor that includes the resolution of the analogue to digital convertor, b' is a constant for photo detectors, e is the emissivity, T0 is the absolute temperature prior to any heating due to damage evolution, n is a constant dependent on the detector properties and its operating wavelength and R is a temperature correction factor is defined as: n DT T R = 0 (4) where TD represents the increased specimen absolute temperature as a result of damage.
Clearly from equation (3) increases in temperature of this magnitude will affect the thermoelastic signal and it is necessary to apply the temperature correction factor, R.
The maximum stress, assuming a stress concentration factor of 3, of approximately 450 MPa was not considered great enough to cause gross fibre breakage.
Vol. 12 (1989), p. 291 [10] Drew, R.C. and White, R.G: An investigation into damage propagation and its effect upon dynamic properties of CFRP composite materials.
Online since: June 2012
Authors: Zhan Qiang Liu, Liang Li, Chong Hai Xu, Tao Zhang, Ning He
The ratio is an important parameter in micro cutting and affects the micro cutting process [[6] D.A.
Surface roughness is predominantly considered as the most important feature of practical engineering surface due to its crucial influence on the mechanical and physical properties of a machined part [[16] H.
Surface roughness can affect the tribological performance of micro parts.
The ratio of uncut chip thickness to cutting edge radius also is regarded as the main factor to control the surface roughness [14,[19] Z.J.
The ratio of uncut chip thickness and the cutting edge radius is regarded as an important factor of exit burr height.
Surface roughness is predominantly considered as the most important feature of practical engineering surface due to its crucial influence on the mechanical and physical properties of a machined part [[16] H.
Surface roughness can affect the tribological performance of micro parts.
The ratio of uncut chip thickness to cutting edge radius also is regarded as the main factor to control the surface roughness [14,[19] Z.J.
The ratio of uncut chip thickness and the cutting edge radius is regarded as an important factor of exit burr height.
Online since: February 2021
Authors: Alexandra V. Kopteva, Alexander Dementyev, Vladimir Koptev
This work is aimed at studying the physicochemical properties of asphaltic resin paraffins, as well as the mechanism of phase transition from liquid to crystalline.
In this form, the adhesion properties of paraffin are enhanced many times, and its ability to "stick" to hard surfaces is greatly intensified.
Lyubin, Risk assessment of accidents due to natural factors at the Pascuales – Cuenca multiple-use pipeline (Ecuador), Journal of Mining Institute 230 (2018) 190-197 DOI: 10.25515/pmi.2018.2.190
Boitsova, Comparative assessment of structural-mechanical properties of heavy oils of Timano-Pechorskaya province, Journal of Mining Institute, 225, (2017) 320-330 DOI: 10.18454/pmi.2017.3.320
Poletaeva, Review of modern methods of influencing the rheological properties of heavy high-viscosity oils, NefteGazokhimiya, 3 (2018)
In this form, the adhesion properties of paraffin are enhanced many times, and its ability to "stick" to hard surfaces is greatly intensified.
Lyubin, Risk assessment of accidents due to natural factors at the Pascuales – Cuenca multiple-use pipeline (Ecuador), Journal of Mining Institute 230 (2018) 190-197 DOI: 10.25515/pmi.2018.2.190
Boitsova, Comparative assessment of structural-mechanical properties of heavy oils of Timano-Pechorskaya province, Journal of Mining Institute, 225, (2017) 320-330 DOI: 10.18454/pmi.2017.3.320
Poletaeva, Review of modern methods of influencing the rheological properties of heavy high-viscosity oils, NefteGazokhimiya, 3 (2018)
Online since: August 2005
Authors: Mats Nygren, Lars Hälldahl
So far, not very
much has been done in the area of thermal transport properties of FGM`s.
Having these two properties, also heat capacity can be calculated.
It is obvious that these properties do not show a linear relation with composition.
Properties like density and heat capacity are to be seen as dependent solely on the quantity of each component.
For the thermal transport properties TC and TD, the situation is more complex.
Having these two properties, also heat capacity can be calculated.
It is obvious that these properties do not show a linear relation with composition.
Properties like density and heat capacity are to be seen as dependent solely on the quantity of each component.
For the thermal transport properties TC and TD, the situation is more complex.
Online since: December 2014
Authors: Tai Xiu Yang, Jing Zhu
The interface agent of SBR (styrene-butadiene rubber) latex modified cement paste has better tensile bonding properties.
Intorduction Nowadays load of cement pavement is constantly growing, causing different levels of damage and functional defects in most of the road, which have already seriously affected service and vehicle security of highway [1,2].
And studies have shown that influencing factors of interlayer bonding performance as follows: cement concrete pavement roughness, the interface agent, power, age [3,4].
Figure 3 The influence of DB-1 polymer dosage on tensile bond strength The mix design of interface agent of RCC-PCC specimens The impact of pouring and interface agent mix on its interface bond performance was studied by studying bond splitting tensile properties of hybrid cubic specimens of the PCC and RCC.
Analysis of reasons: the bond surface is vertically when the lateral placement, and because of the bleeding and shrinkage effects of the new PCC, distribution of the adhesive mass is uneven, resulting in lower bond splitting tensile strength; the bond surface is horizontal when horizontal pouring, the aggregate sank and bubbles rose under the action of the weight and vibration, making the new PCC bond better with surface of RCC, it would form a better result of mechanical occlusion.
Intorduction Nowadays load of cement pavement is constantly growing, causing different levels of damage and functional defects in most of the road, which have already seriously affected service and vehicle security of highway [1,2].
And studies have shown that influencing factors of interlayer bonding performance as follows: cement concrete pavement roughness, the interface agent, power, age [3,4].
Figure 3 The influence of DB-1 polymer dosage on tensile bond strength The mix design of interface agent of RCC-PCC specimens The impact of pouring and interface agent mix on its interface bond performance was studied by studying bond splitting tensile properties of hybrid cubic specimens of the PCC and RCC.
Analysis of reasons: the bond surface is vertically when the lateral placement, and because of the bleeding and shrinkage effects of the new PCC, distribution of the adhesive mass is uneven, resulting in lower bond splitting tensile strength; the bond surface is horizontal when horizontal pouring, the aggregate sank and bubbles rose under the action of the weight and vibration, making the new PCC bond better with surface of RCC, it would form a better result of mechanical occlusion.
Online since: October 2011
Authors: Gang Kong Zhi, Jun Xu Liang
Usually there is a sliding between the contact surfaces of the connector, while the changes in temperature and humidity environment would affect the resistance of the connector contact materials.
The results show that the temperature and humidity environment and sliding has a more complex and significant impact on the performance of the contact materials than single-factors, and the tests are closer to the real working environment.
Study shows that there is not only has sliding, but also has changes in environmental factors in the actual working environment, such as temperature and humidity.
The Electrical contact failures are the results of dynamic influence and environmental factors, so the study of the combined effects of the environment and dynamic influence is very necessary.
Proceedings of the 2nd International Session on Electro-Mechanical Device.
The results show that the temperature and humidity environment and sliding has a more complex and significant impact on the performance of the contact materials than single-factors, and the tests are closer to the real working environment.
Study shows that there is not only has sliding, but also has changes in environmental factors in the actual working environment, such as temperature and humidity.
The Electrical contact failures are the results of dynamic influence and environmental factors, so the study of the combined effects of the environment and dynamic influence is very necessary.
Proceedings of the 2nd International Session on Electro-Mechanical Device.
Online since: August 2017
Authors: Anthony Beaucamp
Properties of carbide materials
Crack formation in brittle materials.
Table 1 shows a summary of these material properties for silicon carbide and tungsten carbide [15], together with the resulting value for critical depth of indentation.
Material properties of binderless carbides used in optical mold fabrication.
Summary In this paper, an overview was provided of the mechanical properties of ceramic materials used in tooling and mold inserts fabrication, such as silicon carbide and tungsten carbide.
Kwon, Mechanical properties of binderless tungsten carbide by spark plasma sintering.
Table 1 shows a summary of these material properties for silicon carbide and tungsten carbide [15], together with the resulting value for critical depth of indentation.
Material properties of binderless carbides used in optical mold fabrication.
Summary In this paper, an overview was provided of the mechanical properties of ceramic materials used in tooling and mold inserts fabrication, such as silicon carbide and tungsten carbide.
Kwon, Mechanical properties of binderless tungsten carbide by spark plasma sintering.
Online since: January 2013
Authors: Barbora Kovářová
Part of a building substance created out of loam must be blending water which significantly affects binding properties of building material and facilitates it´s processing.
Preparation of the mixture The procession of coherent loam into building material for rammed earth houses is in many cases the decisive factor of building efficiency.
If this step is due to time impossible we can substitute this process by mechanical procession of the loam.
Specialists were hired only to set the building on the property.
To higher mechanical, scratch and water resistance it is possible to add to the upper layer cow manure, lime or casein.
Preparation of the mixture The procession of coherent loam into building material for rammed earth houses is in many cases the decisive factor of building efficiency.
If this step is due to time impossible we can substitute this process by mechanical procession of the loam.
Specialists were hired only to set the building on the property.
To higher mechanical, scratch and water resistance it is possible to add to the upper layer cow manure, lime or casein.
Online since: August 2017
Authors: Bahram Ravani, Arash Gobal
This also
allows optimization of mechanical properties by enabling the manufacturing of parts with complex
structures and lattices at no extra cost.
Where as insufficient heating would lead to incomplete powder fusion and poor mechanical properties of the final product [17].
Fusion of powder particles during laser-powder interaction is also modeled to ease predicting the microstructure and mechanical properties of the SLS product for future works.
Absorption rate of the material as well as particle size distribution and packing density of the powder bed are major factors determining the optical absorption and extinction coefficients of the powder bed.
Table 1: Properties of the powder bed [6][4][24].
Where as insufficient heating would lead to incomplete powder fusion and poor mechanical properties of the final product [17].
Fusion of powder particles during laser-powder interaction is also modeled to ease predicting the microstructure and mechanical properties of the SLS product for future works.
Absorption rate of the material as well as particle size distribution and packing density of the powder bed are major factors determining the optical absorption and extinction coefficients of the powder bed.
Table 1: Properties of the powder bed [6][4][24].
Online since: October 2003
Authors: Ralf Georg Cuntze
For design engineers the choice of the macro-mechanical level in modeling is mandatory wrt get- ting macro-mechanical stresses from numerical analysis.
Describing failure by macro-mechanical stresses in general is different to an application of the really failure mechanisms-causing micromechanical stresses (see later the IFF1). 2 The Failure Mode Concept (FMC) 2.1 Lamina Stresses, Invariants, and Properties Figure 1 depicts the 3D state of stress, the 5 strengths, and the 5 elasticity quantities of a UD material element.
Determination of the Degrading Elasticity Properties of the Lamina: By employing the equivalent stress reached in each failure mode the associated secant modulus of each mode was determined for the hardening and the softening regime.
It is still too time-consuming and pre-processing does not inform about design driving modes as well as reserve factors, [8], demanded for the 'Proof of Design'.
Composites Science and Technology 58 (1998), 7, pp. 1001-1010 [4] Soden, P.D., Hinton, M.J. and Kaddour, A.S.: Lamina Properties, Lay-up Configurations and loading conditions for a Range of Fibre-reinforced Composite Laminates.
Describing failure by macro-mechanical stresses in general is different to an application of the really failure mechanisms-causing micromechanical stresses (see later the IFF1). 2 The Failure Mode Concept (FMC) 2.1 Lamina Stresses, Invariants, and Properties Figure 1 depicts the 3D state of stress, the 5 strengths, and the 5 elasticity quantities of a UD material element.
Determination of the Degrading Elasticity Properties of the Lamina: By employing the equivalent stress reached in each failure mode the associated secant modulus of each mode was determined for the hardening and the softening regime.
It is still too time-consuming and pre-processing does not inform about design driving modes as well as reserve factors, [8], demanded for the 'Proof of Design'.
Composites Science and Technology 58 (1998), 7, pp. 1001-1010 [4] Soden, P.D., Hinton, M.J. and Kaddour, A.S.: Lamina Properties, Lay-up Configurations and loading conditions for a Range of Fibre-reinforced Composite Laminates.