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Online since: August 2015
Authors: Marek Fassin, Stephan Wulfinghoff, Stefanie Reese
In this work, two time integration algorithms for the anisotropic damage model proposed
by Lemaitre et al. [1] are compared.
For a comparison of different explicit (or strongly) nonlocal approaches see, e.g., de Vree et al. [11].
Most more recent works focus on gradient-extended damage models (e.g., Miehe et al. [12] or [13]), some of which can be shown to be equivalent to explicitly nonlocal approaches.
Some care must be taken when these implicit gradient models are implemented (e.g., Simone et al. [15]).
The product H s�H is defined by H s�H = 1 2 (HikHjl ei ⊗ ej ⊗ ek ⊗ el + HilHjk ei ⊗ ej ⊗ ek ⊗ el) . (10) For the plastic deformations the following von Mises yield function is applied Φ = eσD − √2 3 (σy + Q) , (11) where σy denotes the initial yield stress and Q describes isotropic hardening.
For a comparison of different explicit (or strongly) nonlocal approaches see, e.g., de Vree et al. [11].
Most more recent works focus on gradient-extended damage models (e.g., Miehe et al. [12] or [13]), some of which can be shown to be equivalent to explicitly nonlocal approaches.
Some care must be taken when these implicit gradient models are implemented (e.g., Simone et al. [15]).
The product H s�H is defined by H s�H = 1 2 (HikHjl ei ⊗ ej ⊗ ek ⊗ el + HilHjk ei ⊗ ej ⊗ ek ⊗ el) . (10) For the plastic deformations the following von Mises yield function is applied Φ = eσD − √2 3 (σy + Q) , (11) where σy denotes the initial yield stress and Q describes isotropic hardening.
Online since: February 2018
Authors: P.K. Mandal
The TEM micrograph of as-cast
Al alloy.
Charit et al. [2004] and Y.Z.
Ma et al. [2003], respectively.
El Rayes, E.A.
El Danaf, M.S.
Charit et al. [2004] and Y.Z.
Ma et al. [2003], respectively.
El Rayes, E.A.
El Danaf, M.S.
Online since: September 2007
Authors: J.M. McGarrity, Aivars J. Lelis, Daniel B. Habersat, Neil Goldsman, Siddharth Potbhare, Gary Pennington, C.R. Ashman
pm
eZ th AVG
S
SB
el υ
µ
µµ
µ *
2
,
111
mod
=
+=
( )
LVV
WNeI thG
el
inv
DSat
−
⋅
= modµ
Fig. 7.
Lu et al.: IEEE Trans.
Lu et al.: IEEE Trans.
Effect of Direct Rolling of Without-Heating on the Differentiation of Mechanical Properties of Rebar
Online since: December 2022
Authors: Xu Ming Liu, Xin Liu, Bao Yu Song, Jun Sheng Wang, Yang Zhao
Ramesh et al. studied the effect of cryogenic treatment on the corrosion resistance of rebars [10].
German et al. employed the numerical simulation to study the effect between rebar’s corrosion and concrete cover [11].
Maksimov et al. [13] improved the production technology and equipment of glass fiber rebar.
References [1] Zaky AI, El-Morsy A, El-Bitar T.
Procedia Engineering, 173, PP: 905-909, 2017. https://doi.org/10.1016/j.proeng.2016.12.139 [3] Gardner L, Bu Y, Francis P, et al.
German et al. employed the numerical simulation to study the effect between rebar’s corrosion and concrete cover [11].
Maksimov et al. [13] improved the production technology and equipment of glass fiber rebar.
References [1] Zaky AI, El-Morsy A, El-Bitar T.
Procedia Engineering, 173, PP: 905-909, 2017. https://doi.org/10.1016/j.proeng.2016.12.139 [3] Gardner L, Bu Y, Francis P, et al.
Online since: August 2007
Authors: Keiyu Nakagawa, Teruto Kanadani
INTRODUCTION
Al-Si alloys are typically used as light metals in casting and die casting, and are extensively used
for automobile parts, such as pistons and cylinder heads.
In these applications, Al-Si alloys are often used under repeated loading conditions, and so it is especially important to increase their fatigue strength.
Previously, Kobayashi et al (1) have reported on the propagation of fatigue cracks in Al-Si casting materials, and research has suggested that only equilibrium Si phases with diamond structure are formed, in contrast to the formation of a quasi-stable states, such as the GP-zone in Al-Cu alloys.
Specimens An Al-1.2mass%Si alloy was made by melting 99.99% Al and 99.999% Si in an alumina crucible in the atmosphere.
strength,�B , and fracture elongation, El, with aging time, tA.
In these applications, Al-Si alloys are often used under repeated loading conditions, and so it is especially important to increase their fatigue strength.
Previously, Kobayashi et al (1) have reported on the propagation of fatigue cracks in Al-Si casting materials, and research has suggested that only equilibrium Si phases with diamond structure are formed, in contrast to the formation of a quasi-stable states, such as the GP-zone in Al-Cu alloys.
Specimens An Al-1.2mass%Si alloy was made by melting 99.99% Al and 99.999% Si in an alumina crucible in the atmosphere.
strength,�B , and fracture elongation, El, with aging time, tA.
Online since: June 2018
Authors: Abdelouahhab Jabri, Ghita Lebbar, Abdellah El Barkany, Ikram El Abbassi
Thereafter, (Allahverdi et al. 2008) [5] showed that the BFSP is NP-hard even for BFSP with m ≥2.
(Ribas et al. 2011) [16] introduced an iterated greedy (IG) algorithm.
(Han et al. 2012) [17] proposed an improved discrete artificial bee colony (IABC) algorithm for solving effectively the BFSP.
The proposed algorithms are compared to other forcful existing metaheuristics in the literature, namely, IABC( han et al. 2012) [17]), DE-ABC( han et al. 2015) [18], IG( Ribas et al.2011) (16], and MFFO ( han et al. 2016) [20].
Graham RL, Lawler EL, Lenstra JK, Rinnooy Kan AHG.
(Ribas et al. 2011) [16] introduced an iterated greedy (IG) algorithm.
(Han et al. 2012) [17] proposed an improved discrete artificial bee colony (IABC) algorithm for solving effectively the BFSP.
The proposed algorithms are compared to other forcful existing metaheuristics in the literature, namely, IABC( han et al. 2012) [17]), DE-ABC( han et al. 2015) [18], IG( Ribas et al.2011) (16], and MFFO ( han et al. 2016) [20].
Graham RL, Lawler EL, Lenstra JK, Rinnooy Kan AHG.
Online since: September 2024
Authors: Juan Carlos Guerra, Leonel Guardiola, Joselyn Alvarado, María Elena Perdomo
Fig.7 Parámetros seleccionados para el comportamiento de los catadores
Analysis and Results
A.
Vásquez-Reyes, «Importancia, genética y evolución del café en Honduras y el mundo», vol. 9, 2020
Kharaba et al., «Caffeine Consumption among Various University Students in the UAE, Exploring the Frequencies, Different Sources and Reporting Adverse Effects and Withdrawal Symptoms», J.
Chávez, «Evaluación sensorial de diferentes marcas comerciales de café instantáneo utilizando el método CATA», J.
Imbachi, «Calidad física, sensorial y composición química del café cultivado en el departamento del Huila», Rev.
Vásquez-Reyes, «Importancia, genética y evolución del café en Honduras y el mundo», vol. 9, 2020
Kharaba et al., «Caffeine Consumption among Various University Students in the UAE, Exploring the Frequencies, Different Sources and Reporting Adverse Effects and Withdrawal Symptoms», J.
Chávez, «Evaluación sensorial de diferentes marcas comerciales de café instantáneo utilizando el método CATA», J.
Imbachi, «Calidad física, sensorial y composición química del café cultivado en el departamento del Huila», Rev.
Online since: June 2025
Authors: Samuel Katwesigye, Nieves López-Salas, Ahmed S.G. Khalil, Mohamed E. El-Khouly
El-Khouly1,b, Nieves López-Salas2,c
and Ahmed S.
Karić et al., ‘Bio-waste valorisation: Agricultural wastes as biosorbents for removal of (in)organic pollutants in wastewater treatment’, Chem.
Zhu et al., ‘Direct laser writing of graphene films from a polyether ether ketone precursor’, J.
Wang et al., ‘All-solid-state supercapacitors from natural lignin-based composite film by laser direct writing’, Appl.
Malyar et al., ‘Sulfation of wheat straw soda lignin: Role of solvents and catalysts’, Catal.
Karić et al., ‘Bio-waste valorisation: Agricultural wastes as biosorbents for removal of (in)organic pollutants in wastewater treatment’, Chem.
Zhu et al., ‘Direct laser writing of graphene films from a polyether ether ketone precursor’, J.
Wang et al., ‘All-solid-state supercapacitors from natural lignin-based composite film by laser direct writing’, Appl.
Malyar et al., ‘Sulfation of wheat straw soda lignin: Role of solvents and catalysts’, Catal.
Online since: January 2018
Authors: Jadambaa Temuujin, Batmunkh Davaabal, Ulambayar Rentsenorov
Zeolite A synthesis mixture.
3.165Na2O
Al2O3
2 SiO2
128 H2O
Raw fly ash(g)
HCl treated fly ash (g)
2 (SiO2: 0.1Al2O3)
-
0.2 Al2O3
2 SiO2
-
4.14
3.25
6.33 (NaOH·0.07H2O)
3.165 Na2O
-
-
3.6 H2O
4.63
4.71
0.8 (1 Al2O3)
-
0.8 Al2O3
-
-
1.46(0.773g Al)
1.61(0.85g Al)
124.4 H2O
124.4 H2O
39.77
40.43
0
0
0
0
Σ 50(g)
Σ 50(g)
In this study fly ash, sodium hydroxide, metal aluminum and distillated water were used as raw materials.
El-Naggar, A.M.
El-Kamash,M.I.
El-Dessouky, A.K.Ghonaim, Two-step method for preparation of NaA-X zeolite blend from fly ash for removal of cesium ions, Journal of Hazardous Materials 154 (2008) 963–972
El-Naggar, A.M.
El-Kamash,M.I.
El-Dessouky, A.K.Ghonaim, Two-step method for preparation of NaA-X zeolite blend from fly ash for removal of cesium ions, Journal of Hazardous Materials 154 (2008) 963–972
Online since: February 2012
Authors: Juan Hong Ren, Hui Chen, Qin Ma
(Mo,Cr)(Si,Al)2 phase has not found in alloys.
Fig.2 Partial X-ray diffraction patterns of the alloys With the further increase of AlCr2 molecular content,the diffraction peak of Mo(Si,Al)2 migrated to the left as shown in Fig.2,it shows that the solid solution alloy was formed.Because of the Al atom radius is greater than the Si atom radius,part of the Al atoms occupy the position of Si atoms in the Mo(Si,Al)2 alloy,causes the lattice constant and interplanar spacing of alloys increased,so the diffraction peak migrated to the left.
is higher than single crystal.But,(Mo,Cr)(Si,Al)2 was not found in this experiment.
MoSi2-AlCr2 quasibinary system alloys were prepared by hot pressed sintering,the main phase composition of alloys were MoSi2 and Mo(Si,Al)2,the crystal structure was gradually transformed from tetragonal C11b MoSi2 to hexagonal C40 Mo(Si,Al)2. 2.
(Mo,Cr)(Si,Al)2 phase has not found in alloys. 3.
Fig.2 Partial X-ray diffraction patterns of the alloys With the further increase of AlCr2 molecular content,the diffraction peak of Mo(Si,Al)2 migrated to the left as shown in Fig.2,it shows that the solid solution alloy was formed.Because of the Al atom radius is greater than the Si atom radius,part of the Al atoms occupy the position of Si atoms in the Mo(Si,Al)2 alloy,causes the lattice constant and interplanar spacing of alloys increased,so the diffraction peak migrated to the left.
is higher than single crystal.But,(Mo,Cr)(Si,Al)2 was not found in this experiment.
MoSi2-AlCr2 quasibinary system alloys were prepared by hot pressed sintering,the main phase composition of alloys were MoSi2 and Mo(Si,Al)2,the crystal structure was gradually transformed from tetragonal C11b MoSi2 to hexagonal C40 Mo(Si,Al)2. 2.
(Mo,Cr)(Si,Al)2 phase has not found in alloys. 3.