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Online since: November 2023
Authors: Adriana Eštoková, Alena Sicakova, Miriama Čambál Hološová
Changes in the properties of the composites after the experiment.
Blast furnace slag also demonstrated positive effects on the mechanical properties and resistance to aggressive ions.
However, the use of bypass admixture resulted in reduced mechanical strength and increased susceptibility to aggressive environmental factors.
Illikainen, Mechanical and acoustic properties of fiber-reinforced alkali-activated slag foam concretes containing lightweight structural aggregates, Constr.
Bascetin, Influence of silica fume on mechanical property of cemented paste backfill, Constr.
Blast furnace slag also demonstrated positive effects on the mechanical properties and resistance to aggressive ions.
However, the use of bypass admixture resulted in reduced mechanical strength and increased susceptibility to aggressive environmental factors.
Illikainen, Mechanical and acoustic properties of fiber-reinforced alkali-activated slag foam concretes containing lightweight structural aggregates, Constr.
Bascetin, Influence of silica fume on mechanical property of cemented paste backfill, Constr.
Online since: January 2010
Authors: Michael Schütze, Alexander Donchev
The different methods only influence the surface region of the
components so that the bulk properties are not affected.
Alloying additions such as Nb can improve the oxidation behavior [3] but alloying of the whole bulk material influences the mechanical properties.
However, brittle coatings can cause failure due to crack initiation during thermocyclic exposure and mechanical load [5].
The performance of the F-BLI² sample can be improved by increasing the dose by a factor of two from 1 to 2 × 10 17 F/cm².
These would be applied after the processing of the components without deteriorating the previous modified properties (microstructure, strength, etc.).
Alloying additions such as Nb can improve the oxidation behavior [3] but alloying of the whole bulk material influences the mechanical properties.
However, brittle coatings can cause failure due to crack initiation during thermocyclic exposure and mechanical load [5].
The performance of the F-BLI² sample can be improved by increasing the dose by a factor of two from 1 to 2 × 10 17 F/cm².
These would be applied after the processing of the components without deteriorating the previous modified properties (microstructure, strength, etc.).
Online since: March 2014
Authors: Norio Takeda, Tomohiro Naruse
To prevent this overestimation, we applied our two adjustment methods to fatigue life prediction for typical random stresses observed on mechanical products.
Figure 1 Cantilevers under random acceleration Figure 4 Fatigue resistance curve Table 1 Properties of cantilevers and base motion No.
On the other hand, the difference between the probability densities for large stress amplitude largely affects the amount of damage.
Given a stress PSD, , Np, and r are calculated using the properties of that PSD.
Pioli, Fatigue behavior analysis of mechanical components subject to bimodal stress process: frequency domain approach, International Journal of Fatigue, Vol. 27, pp. 335-345 (2005) [5] D.
Figure 1 Cantilevers under random acceleration Figure 4 Fatigue resistance curve Table 1 Properties of cantilevers and base motion No.
On the other hand, the difference between the probability densities for large stress amplitude largely affects the amount of damage.
Given a stress PSD, , Np, and r are calculated using the properties of that PSD.
Pioli, Fatigue behavior analysis of mechanical components subject to bimodal stress process: frequency domain approach, International Journal of Fatigue, Vol. 27, pp. 335-345 (2005) [5] D.
Online since: June 2008
Authors: Lyudmil V. Todorov, Olga M. Freire, Julio Viana
The processing method itself consists of combination of rapid and
complex mechanical loading conditions (uni- and multi-axial) and cooling kinetics [1].
Final properties of the mouldings are strongly dependent upon the induced microstructure, which are determined by the imposed thermo-mechanical environment.
Main results are listed in Table 2. 0 10 20 30 40 50 60 70 80 90 100 19.62 35.18 9.51 22.43 85.96 31.17 1.432.28 2.28 1.93 37.75 Vstxλλλλst Vst λλλλst Percent of contribution [%] Factors Tg Tcc χχχχc Tst Figure1 a) DSC thermograms at 20 o C.min -1 heating rate for stretched PET samples according Table 1; b) percentage of contribution of stretching parameters on the DSC parameters.
The melting peak temperature, Tm, is not affected by the stretching history and characterized with a negligible percent of variation of c.a. 0.9%.
Cond1Cond2Cond3Cond4Cond5Cond6Cond7Cond8 0.000 0.005 0.010 0.015 0.020 0.025 0.022 0.010 0.003 0.008 0.0020.002 0.003 0.004 Birefringence 0 10 20 30 40 50 21.40 31.59 13.65 Percent of contribution [%] Tst Vst λλλλst Vstxλλλλst Factors 3.28 Figure 2. a) Birefringence values, ∆n, for the stretched samples; b) percentage of contribution of stretching parameters for the birefringence.
Final properties of the mouldings are strongly dependent upon the induced microstructure, which are determined by the imposed thermo-mechanical environment.
Main results are listed in Table 2. 0 10 20 30 40 50 60 70 80 90 100 19.62 35.18 9.51 22.43 85.96 31.17 1.432.28 2.28 1.93 37.75 Vstxλλλλst Vst λλλλst Percent of contribution [%] Factors Tg Tcc χχχχc Tst Figure1 a) DSC thermograms at 20 o C.min -1 heating rate for stretched PET samples according Table 1; b) percentage of contribution of stretching parameters on the DSC parameters.
The melting peak temperature, Tm, is not affected by the stretching history and characterized with a negligible percent of variation of c.a. 0.9%.
Cond1Cond2Cond3Cond4Cond5Cond6Cond7Cond8 0.000 0.005 0.010 0.015 0.020 0.025 0.022 0.010 0.003 0.008 0.0020.002 0.003 0.004 Birefringence 0 10 20 30 40 50 21.40 31.59 13.65 Percent of contribution [%] Tst Vst λλλλst Vstxλλλλst Factors 3.28 Figure 2. a) Birefringence values, ∆n, for the stretched samples; b) percentage of contribution of stretching parameters for the birefringence.
Online since: December 2011
Authors: Daniel Goran, G. Ji, M. N. Avettand-Fènoël, R. Taillard
The stirred zone (SZ) or nugget is the domain where the maximum temperature is reached and the plastic deformation is also the most intense; it is bordered by the thermomechanical affected zone (TMAZ) with relatively lower strain and temperature; furthermore there is the heat affected zone (HAZ) in-between TMAZ and BM.
Each zone has its own thermo-mechanical history which can be associated with grain refinement, dynamic recovery, dynamic recrystallization, precipitate dissolution and coarsening, etc. [2].
Generally, in this case, the average grain size was reduced from the BM to the SZ by approximately one order of magnitude on the Al side and by at least a factor of 3 on the Cu side.
Imad, Structure and mechanical properties of friction stirred beads 6082-T6 Al alloy and pure copper, Mater.
Each zone has its own thermo-mechanical history which can be associated with grain refinement, dynamic recovery, dynamic recrystallization, precipitate dissolution and coarsening, etc. [2].
Generally, in this case, the average grain size was reduced from the BM to the SZ by approximately one order of magnitude on the Al side and by at least a factor of 3 on the Cu side.
Imad, Structure and mechanical properties of friction stirred beads 6082-T6 Al alloy and pure copper, Mater.
Online since: November 2012
Authors: Jian Ming Gong, Hai Tao Wang, Cheng Ye, Bin Liang
In addition, inevitable factors due to the welding process can affect the very weak RMF component signals, such as the chemical composition of welded metal, the shape and size of the weldment, and heat treatment condition, among others.
The material properties are assumed as isotropic, which are the same in welded seam and in base metal, and they have the same values between 700°C ~1200°C [19].
The material properties of the 16MnR steel under analysis are shown in Fig.2 [21].
The heat-transfer by radiation and phase transformation effects are not considered due to the lack of material properties.
Symbol Material Properties Unit C Specific Heat ×102 J/K·Kg k Conductivity ×10W/K·m2 σy Yield stress ×108 Pa ν Poisson’s Rate ×10-1 E Young’s Modulus ×1011 Pa α Expansion ×10-5 m/m·K Fig. 2 The material properties of 16MnR under different temperature Results and discussion Results of RMF measurements.
The material properties are assumed as isotropic, which are the same in welded seam and in base metal, and they have the same values between 700°C ~1200°C [19].
The material properties of the 16MnR steel under analysis are shown in Fig.2 [21].
The heat-transfer by radiation and phase transformation effects are not considered due to the lack of material properties.
Symbol Material Properties Unit C Specific Heat ×102 J/K·Kg k Conductivity ×10W/K·m2 σy Yield stress ×108 Pa ν Poisson’s Rate ×10-1 E Young’s Modulus ×1011 Pa α Expansion ×10-5 m/m·K Fig. 2 The material properties of 16MnR under different temperature Results and discussion Results of RMF measurements.
Online since: October 2010
Authors: John R. Nicholls, Richard G. Wellman, Remy Steenbakker, Jörg Feist
Thermal, physical and mechanical properties of the thermal barrier coating are influenced by its method of fabrication.
Secondly, small additions of dopants should not dramatically change the properties of the TBC, an important factor when it comes to industry acceptability.
Heyes (2000), Proceedings of the Institution of Mechanical Engineers, 214, Part I, 7-11. 23.
Wybourne, 'Spectroscopic Properties of Rare Earths', J.Wiley & Sons, Inc. (1965). 26.
Nicholls (2001), ‘Proceedings of Institution of Mechanical Engineers, 215 Part G, 333-340. 27.
Secondly, small additions of dopants should not dramatically change the properties of the TBC, an important factor when it comes to industry acceptability.
Heyes (2000), Proceedings of the Institution of Mechanical Engineers, 214, Part I, 7-11. 23.
Wybourne, 'Spectroscopic Properties of Rare Earths', J.Wiley & Sons, Inc. (1965). 26.
Nicholls (2001), ‘Proceedings of Institution of Mechanical Engineers, 215 Part G, 333-340. 27.
Online since: December 2012
Authors: Xin Shi, Yuan Guo
According to the designers' understanding, diverse texture properties of the material give people diverse feeling whenever and wherever.
Such reference method in design breaks the rules of strict use of material and the old process, translating the impossibility factors into the real possible design element [8].
On one hand, cross-border conflict would attract people’s more attention, on the other hand, similar factors would speed up people’s understanding and the process of adaptation.
The way of reference is a challenge to the conventional material properties.
The superposition and integration we point out here build on the casual factors and get inspiration from the random material resources and in the end to display different creative products.
Such reference method in design breaks the rules of strict use of material and the old process, translating the impossibility factors into the real possible design element [8].
On one hand, cross-border conflict would attract people’s more attention, on the other hand, similar factors would speed up people’s understanding and the process of adaptation.
The way of reference is a challenge to the conventional material properties.
The superposition and integration we point out here build on the casual factors and get inspiration from the random material resources and in the end to display different creative products.
Online since: September 2013
Authors: Yan Long Liu, Chao Fa Tang, Wen Hao Shen, Ji Wen Han, Hong Shuang Du
The main properties of desulfurization gypsum and natural gypsum are similar.
The effect of retarder and gypsum slurry pH value on the mechanical properties of gypsum is same[1-7].
The conductive carbon black has different dispersion properties inner the different materials; the dispersing performance has influence on the property of antistatic products.
Added Conductive carbon black has a certain influence on physical and mechanical properties of the materials, usually a certain addition amount can improve the physical and mechanical properties of material [8-11].
The physical properties and the conductivity of the conductive carbon black depend on the aggregate volume and micro pore degree.
The effect of retarder and gypsum slurry pH value on the mechanical properties of gypsum is same[1-7].
The conductive carbon black has different dispersion properties inner the different materials; the dispersing performance has influence on the property of antistatic products.
Added Conductive carbon black has a certain influence on physical and mechanical properties of the materials, usually a certain addition amount can improve the physical and mechanical properties of material [8-11].
The physical properties and the conductivity of the conductive carbon black depend on the aggregate volume and micro pore degree.
Online since: June 2014
Authors: Yong Ki An, Dong Teak Chung, Hyung Kang, Byung Yun Joo
The main parameters that affect the protective ability are initial compressive yield stress and fracture stress.
Table 1 shows the mechanical properties of nonstrengthened and strengthened borosilicate glass plates [2], [3].
It was found that the heat treatment of glass strengthened its static mechanical properties, such as surface hardness and fracture toughness, by up to ~20%.
Mechanical properties and composition of borosilicate glass used as bulletproof glass material Figure 1 shows the experimental setup for the high-velocity impact tests of a glass plate.
Table 2 Material parameters of borosilicate glass used as bulletproof glass material Property Unit Initial guess Reference Borosilicate glass (Nonstrengthened) Borosilicate crystallized glass (Strengthened) Compressive fracture parameters Initial yield stress, Yi GPa 0.5–2.1 [2,3] 1.18 1.42 Strain rate dependency, B - 0.012 Parameter study 0.012 0.012 Fracture EQPS - 0.033 Parameter study 0.033 0.033 Slope, λ - 0.5–3.0 [6,7,9] 0.75 0.75 Degradation factor, S - 0.75 [6,7,9] 2.5 2.5 Tensile fracture parameters Fracture stress, σfr GPa 0.02–0.04 [1,2,3] 0.029 0.031 Fracture energy, Gc GPa.mm 1.0e-6–1.0e-5 [2] 8.89e-6 18.15e-6 Initial crack length, a mm 0.1 - 0.1 0.1 Frictions parameters Fraction coefficient, f - 0.2 Parameter study 0.2 0.2 Erosion parameters EQPS 0.2–0.3 [6,7,11] 0.3 0.3 Two parameters were found to strongly influence the glass strength: the initial yield stress in the compressive fracture and the fracture stress in the tensile fracture.
Table 1 shows the mechanical properties of nonstrengthened and strengthened borosilicate glass plates [2], [3].
It was found that the heat treatment of glass strengthened its static mechanical properties, such as surface hardness and fracture toughness, by up to ~20%.
Mechanical properties and composition of borosilicate glass used as bulletproof glass material Figure 1 shows the experimental setup for the high-velocity impact tests of a glass plate.
Table 2 Material parameters of borosilicate glass used as bulletproof glass material Property Unit Initial guess Reference Borosilicate glass (Nonstrengthened) Borosilicate crystallized glass (Strengthened) Compressive fracture parameters Initial yield stress, Yi GPa 0.5–2.1 [2,3] 1.18 1.42 Strain rate dependency, B - 0.012 Parameter study 0.012 0.012 Fracture EQPS - 0.033 Parameter study 0.033 0.033 Slope, λ - 0.5–3.0 [6,7,9] 0.75 0.75 Degradation factor, S - 0.75 [6,7,9] 2.5 2.5 Tensile fracture parameters Fracture stress, σfr GPa 0.02–0.04 [1,2,3] 0.029 0.031 Fracture energy, Gc GPa.mm 1.0e-6–1.0e-5 [2] 8.89e-6 18.15e-6 Initial crack length, a mm 0.1 - 0.1 0.1 Frictions parameters Fraction coefficient, f - 0.2 Parameter study 0.2 0.2 Erosion parameters EQPS 0.2–0.3 [6,7,11] 0.3 0.3 Two parameters were found to strongly influence the glass strength: the initial yield stress in the compressive fracture and the fracture stress in the tensile fracture.