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Online since: January 2012
Authors: Wei Shi, Yuan Hao Jiang, Jin Han, Yong Bin Li
The drawing test for geogrid in fly ash
The test principle and scheme.Drawing test is used to determine the interaction characteristic between the reinforcement material and filler soil, mainly through give a drawing force to reinforcement material embedded in filler soil, and to pull it out or make it loose, the principle is shown in fig.1 in order to study the changes in water content of fly ash on geogrid drawing effect, the article undertook three kind of different moisture content , two different pressure pull out test, specific test condition is shown in table 1, using watering can sprinkling and stirring to keep the wet soil moisture uniformity.
(a) (b) Fig. 2 The converted drawing experimental device Fig. 3 Sample unit plans Test material.The geogrid material used in this experiment is one-way geogrid EG90R provided by New Grids Limited,it's performance indicators shown in Table 2.In order to keep interface friction of geogrid in the area of fly ash in the same throughout the experiment.Experiment with the length of the geogrid is 80cm with one 50cm buried in the soil.Ensure that there is a complete longitudinal ribs and two transverse ribs in the chamber, and the remaining 30cm is to install and set aside out of the slot.In order to eliminate the effect of sidewall friction boundary,the test uses six longitudinal ribs of the geogrid sample.
physical properties index of fly ash proportion liquid limit (WL) plastic limit (WP) plasticity index (IP) particle composition fine sand 0.25-0.075 mm powder 0.075-0.005mm clay <0.005mm 2.19 38 28 6.9 5.3 70.2 23.5 Test procedure.(1)Anchor chamber with rebar.(2)Proof pressure of hydraulic jacks.(3)Mix fly ash of different moisture content.(4)Put fly ash into the chamber,adding geogrid,hierarchical compaction.(5)Moved sample to the shelf of stretching machine ,start the computer, drawing machine system,adjust the distance between fixture and geogrid,clamp the sample by fixture,computer readings (displacement, pressure) back to zero,set the drawing speed parameters 1mm/min,uniform drawing geogrid,peak pull-out occurs,end the experiment.(6)Shed normal pressure and pulling force,remove the cover plate,plane to the surface filling, take the soil samples near the grill by cutting ring, determine the physical and mechanical experimental data of fly ash.(7)Replace the size of reinforced materials
Acknowledgements This study is part of the research project “Creep Behavior of Geogrid-Reinforced Fly Ash Retaining Wall under Long-Term Load” financially supported by the Natural Science Fund of Shandong Province (project No.
[2] Jie Zhao .Application of Reinforced Earth in the Side Roadbed Protection of the Jacking Bridge[J],.Journal of Liaoning Provincial College of Communications.2009.In Chinese
(a) (b) Fig. 2 The converted drawing experimental device Fig. 3 Sample unit plans Test material.The geogrid material used in this experiment is one-way geogrid EG90R provided by New Grids Limited,it's performance indicators shown in Table 2.In order to keep interface friction of geogrid in the area of fly ash in the same throughout the experiment.Experiment with the length of the geogrid is 80cm with one 50cm buried in the soil.Ensure that there is a complete longitudinal ribs and two transverse ribs in the chamber, and the remaining 30cm is to install and set aside out of the slot.In order to eliminate the effect of sidewall friction boundary,the test uses six longitudinal ribs of the geogrid sample.
physical properties index of fly ash proportion liquid limit (WL) plastic limit (WP) plasticity index (IP) particle composition fine sand 0.25-0.075 mm powder 0.075-0.005mm clay <0.005mm 2.19 38 28 6.9 5.3 70.2 23.5 Test procedure.(1)Anchor chamber with rebar.(2)Proof pressure of hydraulic jacks.(3)Mix fly ash of different moisture content.(4)Put fly ash into the chamber,adding geogrid,hierarchical compaction.(5)Moved sample to the shelf of stretching machine ,start the computer, drawing machine system,adjust the distance between fixture and geogrid,clamp the sample by fixture,computer readings (displacement, pressure) back to zero,set the drawing speed parameters 1mm/min,uniform drawing geogrid,peak pull-out occurs,end the experiment.(6)Shed normal pressure and pulling force,remove the cover plate,plane to the surface filling, take the soil samples near the grill by cutting ring, determine the physical and mechanical experimental data of fly ash.(7)Replace the size of reinforced materials
Acknowledgements This study is part of the research project “Creep Behavior of Geogrid-Reinforced Fly Ash Retaining Wall under Long-Term Load” financially supported by the Natural Science Fund of Shandong Province (project No.
[2] Jie Zhao .Application of Reinforced Earth in the Side Roadbed Protection of the Jacking Bridge[J],.Journal of Liaoning Provincial College of Communications.2009.In Chinese
Online since: October 2011
Authors: Qing Ming Zhang, Xue Liu, Yuan Hang He, Zhe Zhai
Characteristics of Shock Initiation of Single-shell and Double-shell Casing Charges
Xue Liu1,a, Qingming Zhang2,b, Yuanhang He3,c and Zhe Zhai4,d
State Key Laboratory of Explosion Science and Technology
Beijing Institute of Technology, Beijing, China
qmzhang@bit.edu.cn
Keywords: shock initiation; hypervelocity impact; double-shell casing; characteristic of shock initiation
Abstract.
Material models.
Hydrodynamic tensile failure model was used to describe the spalling and cavitation of projectile and casing material.
Table 1 Materials and Computing Model Materials Models Arithmetic EOS Strength Model Failure Model Projectile/1006 Steel SPH Shock Johnson Cook Hydro Tensile Casing/7075T6 AL SPH Tillotson Steingerg Guinan Hydro Tensile Explosive Lagrange Lee-Tarver(JWL) Von Mises None Parameter of models.
Allahdadi, "High Strain Lagrangian Hydrodynamics: A Three-Dimensional SPH Code for Dynamic Material Response," Journal of Computational Physics, vol. 109, pp. 67-75, 1993
Material models.
Hydrodynamic tensile failure model was used to describe the spalling and cavitation of projectile and casing material.
Table 1 Materials and Computing Model Materials Models Arithmetic EOS Strength Model Failure Model Projectile/1006 Steel SPH Shock Johnson Cook Hydro Tensile Casing/7075T6 AL SPH Tillotson Steingerg Guinan Hydro Tensile Explosive Lagrange Lee-Tarver(JWL) Von Mises None Parameter of models.
Allahdadi, "High Strain Lagrangian Hydrodynamics: A Three-Dimensional SPH Code for Dynamic Material Response," Journal of Computational Physics, vol. 109, pp. 67-75, 1993
Online since: March 2017
Authors: Andreas Öchsner, Markus Merkel, Leonhard Hitzler, Johann Hirsch
On a side note, the inclination angle during manufacture affects not only the surface quality, it has also an immense influence on the tensile strength and a measurable impact on the fracture toughness of the material [11-13].
The fabrication of downwards orientated faces without support structure underneath was found to be more complex with 316L (1.4404), as it has been the case in previous studies with AlSi10Mg raw material [4,11].
Journal of Advanced Mechanical Design, Systems, and Manufacturing 8 (2014) JAMDSM0009
Van Humbeeck (2010) Part and material properties in selective laser melting of metals.
In: Machining, Joining and Modifications of Advanced Materials.
The fabrication of downwards orientated faces without support structure underneath was found to be more complex with 316L (1.4404), as it has been the case in previous studies with AlSi10Mg raw material [4,11].
Journal of Advanced Mechanical Design, Systems, and Manufacturing 8 (2014) JAMDSM0009
Van Humbeeck (2010) Part and material properties in selective laser melting of metals.
In: Machining, Joining and Modifications of Advanced Materials.
Online since: July 2015
Authors: Mitsuhiro Shigeishi, Ni Nyoman Kencanawati, Buan Anshari, Jauhar Fajrin, Akmaluddin Akmaluddin
Thus, there is an urgent need to establish a recycling technology that reutilizes aggregate from concrete waste as a new material for fabrication of concrete in regard to environmental protection and optimized exploitation of resources.
It only can be applied as road bed materials due to low quality of recycled aggregate.
For analysis consideration, normal fresh coarse aggregate concrete were also produced taken from the same query as material for recycling.
References [1] Anwar SNR, Pemanfaatan Limbah Struktur sebagai Alternatif Pengganti Agregat Kasar Beton, e-Journal FT Unram, Vol 3( 2007) 84-93 (in Indonesian)
[7 ] Kencanawati NN, Iizasa S, Shigeishi M, Fracture Process And Reliability Of Concrete Made From High Grade Recycled Aggregate Using Acoustic Emission Technique Under Compression, Materials and Structures, Volume 46, Issue 9 (2013), 1441-1448
It only can be applied as road bed materials due to low quality of recycled aggregate.
For analysis consideration, normal fresh coarse aggregate concrete were also produced taken from the same query as material for recycling.
References [1] Anwar SNR, Pemanfaatan Limbah Struktur sebagai Alternatif Pengganti Agregat Kasar Beton, e-Journal FT Unram, Vol 3( 2007) 84-93 (in Indonesian)
[7 ] Kencanawati NN, Iizasa S, Shigeishi M, Fracture Process And Reliability Of Concrete Made From High Grade Recycled Aggregate Using Acoustic Emission Technique Under Compression, Materials and Structures, Volume 46, Issue 9 (2013), 1441-1448
Online since: September 2019
Authors: Andrey Didenko, Ilya Kobykhno, Gleb Vaganov, Elena Ivan’kova, Vladimir E. Yudin, Tatyana Kuznetsova, Elena Popova
At the same time, PEEK based materials obtained by SLS are used not only for the creation of high-strength heat-resistant products, but also in tissue engineering for creating scaffolds [8, 9].
Analysis of the modern literature has shown that today there are quite extensive studies in the use of standard thermoplastic polymeric materials (mainly based on polyamide) in SLS.
Stucker, Additive Manufacturing Technologies: Rapid Prototyping to Direct Digital Manufacturing, Springer Science and Business Media, New York, 2010
Materials and Design. 61 (2014) 124-132
Shi, Material properties and fabrication parameters in selective laser sintering process, Rapid prototyping journal, 3 (1997) 129-136.
Analysis of the modern literature has shown that today there are quite extensive studies in the use of standard thermoplastic polymeric materials (mainly based on polyamide) in SLS.
Stucker, Additive Manufacturing Technologies: Rapid Prototyping to Direct Digital Manufacturing, Springer Science and Business Media, New York, 2010
Materials and Design. 61 (2014) 124-132
Shi, Material properties and fabrication parameters in selective laser sintering process, Rapid prototyping journal, 3 (1997) 129-136.
Online since: December 2012
Authors: Xiong Tong, Yong Cheng Zhou, Xiao Wang, Zheng Bin Deng, Xian Xie
Second, use the tailings to make a simple processing as building materials (brickmaking for iron tailings) or fill the gob area.
Third, make a finishing and produce high additional value materials.
Forth, make a ecological reconstruction as restoration materials [1].
Acknowledgements The authors are thankful to the financial support from the Joint Foundation between the National Natural Science Foundation Committee of China and Yunnan Provincial Government (Grant No.U0937602), the National Natural Science Foundation Committee of China (Grant No.51174103).
[3] MacArthur JS, Forrest RW and Forrest W: British Patent 10223.(1888) [4] Elsner,L:Journal fuer Praktische Chemie.Vol.37(1846),p.441 [5] Mills,T,in:An Introduction Study of the Dissolution of Gold and Silverin Cyanide Solution. edtied by Ph.D,University of Melbourne,(1951), in press
Third, make a finishing and produce high additional value materials.
Forth, make a ecological reconstruction as restoration materials [1].
Acknowledgements The authors are thankful to the financial support from the Joint Foundation between the National Natural Science Foundation Committee of China and Yunnan Provincial Government (Grant No.U0937602), the National Natural Science Foundation Committee of China (Grant No.51174103).
[3] MacArthur JS, Forrest RW and Forrest W: British Patent 10223.(1888) [4] Elsner,L:Journal fuer Praktische Chemie.Vol.37(1846),p.441 [5] Mills,T,in:An Introduction Study of the Dissolution of Gold and Silverin Cyanide Solution. edtied by Ph.D,University of Melbourne,(1951), in press
Online since: June 2019
Authors: Constantin Gheorghe Opran, Ion Riza
Methods and Special Functions Bessel and Kummer Applied in Composites Diffusion Modelling
RIZA Ion1,a* and OPRAN Constantin Gheorghe2,b
1Technical University of Cluj-Napoca, Department of Materials Science and Engineering, Bd.
Popescu, Sci-Afric Journal of Scientific Issues Research and Essays 2, 269-273, (2014)
Popescu, Journal of Basic & Applied Sciences 10, 267-270, (2014)
Popescu, Applied Mechanics and Materials 760, 269-274, (2015)
Opran, Advanced Materials Research, 1098, 138-143, (2015).
Popescu, Sci-Afric Journal of Scientific Issues Research and Essays 2, 269-273, (2014)
Popescu, Journal of Basic & Applied Sciences 10, 267-270, (2014)
Popescu, Applied Mechanics and Materials 760, 269-274, (2015)
Opran, Advanced Materials Research, 1098, 138-143, (2015).
Online since: September 2017
Authors: Oluwole Daniel Makinde, Bijjanal Jayanna Gireesha, K. Ganesh Kumar, S. Manjunatha
Figure 6 reflects influence of material parameter (K)on velocity distribution.
It signifies the enhancement of momentum boundary layer thickness exists for the larger values of material parameter.
Animasaun, Bioconvection in MHD nanofluid flow with nonlinear thermal radiation and quartic autocatalysis chemical reaction past an upper surface of a paraboloid of revolution,International Journal of Thermal Sciences, 109(2016) 159-171
Balasiddulu, MHD and radiation effects on mixed convection unsteady flow of micropolar fluid over a stretching sheet, Procedia Computer Science, 57 (2015) 65–76
Gireesha, Effects of variable viscosity and thermal conductivity on MHD flow and heat transfer of a dusty fluid, Ain Shams Engineering Journal, 7(1), (2016) 505–515
It signifies the enhancement of momentum boundary layer thickness exists for the larger values of material parameter.
Animasaun, Bioconvection in MHD nanofluid flow with nonlinear thermal radiation and quartic autocatalysis chemical reaction past an upper surface of a paraboloid of revolution,International Journal of Thermal Sciences, 109(2016) 159-171
Balasiddulu, MHD and radiation effects on mixed convection unsteady flow of micropolar fluid over a stretching sheet, Procedia Computer Science, 57 (2015) 65–76
Gireesha, Effects of variable viscosity and thermal conductivity on MHD flow and heat transfer of a dusty fluid, Ain Shams Engineering Journal, 7(1), (2016) 505–515
Online since: December 2012
Authors: Yong Yang, Bing Liu, Yu Ling Wang
But titanium alloys are also difficult-to-machine materials with considerable manufacturing problems.
Residual stress balance is broken when cutting of materials in CNC machining process, which leads to the new balance of residual stress and causes the distortion of monolithic component.
It is assumed that heat conduction performance of materials is isotropic.
Materials & Design, 2012, 34: 679-684
Journal of Structure Engineering 2000, 3: 306-315 [4] C.
Residual stress balance is broken when cutting of materials in CNC machining process, which leads to the new balance of residual stress and causes the distortion of monolithic component.
It is assumed that heat conduction performance of materials is isotropic.
Materials & Design, 2012, 34: 679-684
Journal of Structure Engineering 2000, 3: 306-315 [4] C.
Online since: May 2011
Authors: Tian Bo Peng, Xun Tao Yu, Zhen Nan Wang
In this paper, the finite element software of ANSYS is adopted to study the influences of dimension parameters on the compression performance of FRP rubber bearing, considering the large deformation and incompressible properties of rubber materials.
In this paper, a two-parameter Mooney-Rivlin model is adopted to simulate the rubber materials, the mechanical properties can be expressed as: (1) Where, W is a generalized Mooney-Rivlin strain energy function; the material constants C10=0.433MPa, C01=0.146MPa were determined through tensile and shearing tests.
For most kinds of rubber material, the approximation is reasonable.
Acknowledgements The authors gratefully acknowledge the financial support provided by the Natural Science Foundation of China (National Key Project No. 50708074).
“Analysis of fiber-reinforced elastomeric isolator”, Journal of Seismology and Earthquake Engineering, 1999, 2:19-34
In this paper, a two-parameter Mooney-Rivlin model is adopted to simulate the rubber materials, the mechanical properties can be expressed as: (1) Where, W is a generalized Mooney-Rivlin strain energy function; the material constants C10=0.433MPa, C01=0.146MPa were determined through tensile and shearing tests.
For most kinds of rubber material, the approximation is reasonable.
Acknowledgements The authors gratefully acknowledge the financial support provided by the Natural Science Foundation of China (National Key Project No. 50708074).
“Analysis of fiber-reinforced elastomeric isolator”, Journal of Seismology and Earthquake Engineering, 1999, 2:19-34