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Online since: July 2017
Authors: Gian Piero Lignola, Claudio D'Ambra, Francesco Fabbrocino, Elio Sacco, Andrea Prota
Clay brick properties are taken from technical data sheet.
Unreinforced wall The unreinforced wall showed a brittle behaviour, a slightly nonlinear initial branch is followed by a sudden load drop, an almost continuous reduction of stiffness has been recorded during the test.
The displacement due to rigid rotation, Δrot, has been calculated according to the data recorded by vertical LVDTs and according to the equation: Δrot = H · ArcTan {(LVDTL-LVDTM)/d} (1) where d represents the distance between the LVDTs L and M.
The progressive stiffness reduction of the unreinforced masonry wall demonstrated the progressive damage of the joints.
Unreinforced wall The unreinforced wall showed a brittle behaviour, a slightly nonlinear initial branch is followed by a sudden load drop, an almost continuous reduction of stiffness has been recorded during the test.
The displacement due to rigid rotation, Δrot, has been calculated according to the data recorded by vertical LVDTs and according to the equation: Δrot = H · ArcTan {(LVDTL-LVDTM)/d} (1) where d represents the distance between the LVDTs L and M.
The progressive stiffness reduction of the unreinforced masonry wall demonstrated the progressive damage of the joints.
Online since: March 2015
Authors: Li Min Zhou, Yun Wan, Jian Lu
There are many benefits to use composites, including reductions of weight, flatness for stealth requirements, and increased resistance to corrosion.
The pioneering work of Gleiter [6] showed that further grain size reduction down to the nanometer range (<100 nm) may lead to exceptional properties (e.g. ultra-high strength) achievable by a wide range of materials with nanocrystalline structures such as metals and ceramics.
Comparison of the ballistic impact test between our finite-element results, Jaime Fronta et al's[11] finite-element results and experimental data.
A constitutive model and data for metals subjected to large strains, high strain rates and high temperatures.
The pioneering work of Gleiter [6] showed that further grain size reduction down to the nanometer range (<100 nm) may lead to exceptional properties (e.g. ultra-high strength) achievable by a wide range of materials with nanocrystalline structures such as metals and ceramics.
Comparison of the ballistic impact test between our finite-element results, Jaime Fronta et al's[11] finite-element results and experimental data.
A constitutive model and data for metals subjected to large strains, high strain rates and high temperatures.
Online since: November 2012
Authors: Virgínia Infante, José A.S. Cardoso, Bruno A.S. Serrano
Conventional repairs involving complete replacement can be time-consuming and expensive, and
the reduction of service loads with existing cracks is questionable, so quick, simple and economical
crack retardation methods seem to be the best option and the most used.
The reduction of crack tip stress concentrations can be achieved by the stop-drilling technique.The stop-drilling technique or SD is an emergency procedure fairly popular in the aeronautical industry.
Hence, it is important to the aeronautical industry and scientific knowledge to develop some experimental data related to SD fatigue life on thin plates of Aluminium.
Numerical results were compared to experimental data values.
The reduction of crack tip stress concentrations can be achieved by the stop-drilling technique.The stop-drilling technique or SD is an emergency procedure fairly popular in the aeronautical industry.
Hence, it is important to the aeronautical industry and scientific knowledge to develop some experimental data related to SD fatigue life on thin plates of Aluminium.
Numerical results were compared to experimental data values.
Online since: May 2021
Authors: Igor Kovalev, Nikolay Testoyedov, Vladislav Gerashchenko, Lev Oborin
The purpose of the work is the reduction in the level of non-metallic inclusions, d - ferrite and concentration nitrogen, having a negative effect on the mechanical properties of steel grade 08H14N5M2DL.
The following data on nitrogen solubility were obtained: for ferrochrome [N]equ = 0.396 %; for steel VNL-3 [N]equ = 0.161 % in air at temperature 1 600 °С.
The duration of saturation of the VNL-3 melt from a concentration of 0.040 to 0.060% calculated from these data is: t = 0.168·104 second either 28 minutes.
The experiments have shown that when ensuring and observing the following conditions, the level of non-metallic inclusions, the content d - ferrite and nitrogen as part of the resulting steel: · Structural and technological rigidity of the furnace frame and the introduction of an inductor; use of high-quality materials; · charge preparation and reduction of its premelting time, complex deoxidation of steels with the use of master alloy FS30RZMZ0; · introduction of a device for thermostating samples of hot magnetic induction; · float control of nitrogen and aging mode of parts after hardening.
The following data on nitrogen solubility were obtained: for ferrochrome [N]equ = 0.396 %; for steel VNL-3 [N]equ = 0.161 % in air at temperature 1 600 °С.
The duration of saturation of the VNL-3 melt from a concentration of 0.040 to 0.060% calculated from these data is: t = 0.168·104 second either 28 minutes.
The experiments have shown that when ensuring and observing the following conditions, the level of non-metallic inclusions, the content d - ferrite and nitrogen as part of the resulting steel: · Structural and technological rigidity of the furnace frame and the introduction of an inductor; use of high-quality materials; · charge preparation and reduction of its premelting time, complex deoxidation of steels with the use of master alloy FS30RZMZ0; · introduction of a device for thermostating samples of hot magnetic induction; · float control of nitrogen and aging mode of parts after hardening.
Online since: May 2016
Authors: Shae K. Kim, Seong Ho Ha, Young Ok Yoon, Su Yeon Lee
The reduction of component thickness is limited due to the insufficient strength [1-3].
The addition of Mg can meet the strength improvement and further weight reduction, simultaneously.
Table 2 summarizes the data of X-ray diffraction angles of Si (220) and (311), peak separation of 220-311, twin probability and average twin of all the measured samples.
Data obtained from the unmodified sample is also shown in the table for comparison.
The addition of Mg can meet the strength improvement and further weight reduction, simultaneously.
Table 2 summarizes the data of X-ray diffraction angles of Si (220) and (311), peak separation of 220-311, twin probability and average twin of all the measured samples.
Data obtained from the unmodified sample is also shown in the table for comparison.
Online since: June 2015
Authors: E.G. Gazenaur, A.P. Rodzevich, S.V. Ivakhnyuk, V.I. Krasheninin, V.G. Marenets
Using these data it is possible to time the dislocation shift in for a certain distance under the influence of the longitudinal electric field applied in radiation.
There is a near-surface bend of energy zones in a reaction area, it turns out to be possible to change the size of a zone bend by means of transverse electric field (taking into account bigger efficiency of noncontact electric field) that leads to dependence on polarity of electric field, reduction or increase of chemical reaction speed (as holes are considered as reactive chemicals).
Finding of a gas bubble plays a significant role for methodological data.
Reduction of an intermediate product formation quantity in a weak noncontact field indirectly shows the influence of weak electric field on a stage of an intermediate product formation of solid-phase azide decomposition.
There is a near-surface bend of energy zones in a reaction area, it turns out to be possible to change the size of a zone bend by means of transverse electric field (taking into account bigger efficiency of noncontact electric field) that leads to dependence on polarity of electric field, reduction or increase of chemical reaction speed (as holes are considered as reactive chemicals).
Finding of a gas bubble plays a significant role for methodological data.
Reduction of an intermediate product formation quantity in a weak noncontact field indirectly shows the influence of weak electric field on a stage of an intermediate product formation of solid-phase azide decomposition.
Online since: July 2015
Authors: Eva Vejmelková, Jaroslava Koťátková, Dana Koňáková, Pavel Reiterman, Jamal Akhter Siddique
From the comparison of the two reference mixtures there is clear reduction of open porosity when silica fume is added, whilst bulk density slightly grows.
Obtained data from water sorptivity test represented by water absorption coefficient are given in Table 5.
Generally NP shows wider variance in obtained data compared to FCB.
Further reduction is more significant with the use of FCB than NP, as it lowers even for substitution of 30% of cement.
Obtained data from water sorptivity test represented by water absorption coefficient are given in Table 5.
Generally NP shows wider variance in obtained data compared to FCB.
Further reduction is more significant with the use of FCB than NP, as it lowers even for substitution of 30% of cement.
Online since: April 2009
Authors: T. Mahalingam, Velumani Subramaniam, S. Thanikaikarasan, S.R. Srikumar, Tae Kyu Kim, Yong Deak Kim, Rene Asomoza
Moreover, the reduction of stress, dislocation density and increase in crystallite size of
CdSe thin films may be useful for opto-electronic applications.
Xray diffraction data of electrosynthesized CdSe thin films were recorded using an x-ray diffractometer (Philips Model PW 1710) with CuKα radiation (λ= 0.15418 nm).
The cumulative effect of decrease in the R.M.S strain value and dislocation density may be responsible for the gradual reduction in the stacking fault of the layers with increase in film thickness.
JCPDS Diffraction Data Card.No.08-0459
Xray diffraction data of electrosynthesized CdSe thin films were recorded using an x-ray diffractometer (Philips Model PW 1710) with CuKα radiation (λ= 0.15418 nm).
The cumulative effect of decrease in the R.M.S strain value and dislocation density may be responsible for the gradual reduction in the stacking fault of the layers with increase in film thickness.
JCPDS Diffraction Data Card.No.08-0459
Online since: August 2020
Authors: Ahmed Hassan El Shazly, Mohammed Fuseini, Marwa Farouk El-Kady
The conjugated organic polymers which are originally semiconducting or insulating are converted into their conducting form by increasing their conductivity several folds through chemical oxidation or reduction is known as doping [2].
Oxidation is assigned as p-doping and reduction as n-doping.
The aim of this study is to correspond acid doping using formic acid at different concentration of polyaniline particles in an aqueous medium with the values of zeta potential of these particles and the relationship of the data to the measurement of electromagnetic absorption in the UV-visible boundaries.
Data was obtained in the 2θ range of 10-100 degrees with 0.02 step.
Oxidation is assigned as p-doping and reduction as n-doping.
The aim of this study is to correspond acid doping using formic acid at different concentration of polyaniline particles in an aqueous medium with the values of zeta potential of these particles and the relationship of the data to the measurement of electromagnetic absorption in the UV-visible boundaries.
Data was obtained in the 2θ range of 10-100 degrees with 0.02 step.
Online since: March 2007
Authors: Megumi Kawasaki, Cheng Xu, Terence G. Langdon, Z. Horita, Minoru Furukawa
Nevertheless, there are some alloys where processing by ECAP
may lead to a reduction in the yield stress because of a fragmentation of precipitates during the
pressing operation.
The results shown in Fig. 1 are unusual because a reduction in grain size by close to an order of magnitude should produce a stronger material at ambient temperature because of the Hall-Petch relationship.
Furthermore, this result is not consistent with published data for many other alloy systems: for example, experiments showed the measured 0.2% proof stress increased significantly after processing by ECAP for a number of commercial aluminum-based alloys having submicrometer grain sizes [21].
Figure 7 shows experimental measurements of the shapes of the cavities for the ECAP sample exhibiting an elongation of 1085% in Fig. 6(b): data are presented separately in (a) for the 20% smallest cavities and in (b) for the 20% largest cavities [13].
The results shown in Fig. 1 are unusual because a reduction in grain size by close to an order of magnitude should produce a stronger material at ambient temperature because of the Hall-Petch relationship.
Furthermore, this result is not consistent with published data for many other alloy systems: for example, experiments showed the measured 0.2% proof stress increased significantly after processing by ECAP for a number of commercial aluminum-based alloys having submicrometer grain sizes [21].
Figure 7 shows experimental measurements of the shapes of the cavities for the ECAP sample exhibiting an elongation of 1085% in Fig. 6(b): data are presented separately in (a) for the 20% smallest cavities and in (b) for the 20% largest cavities [13].