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Online since: July 2015
Authors: Lena Müller, Benjamin Lehmann, Götz T. Gresser
The benefit of pressurized sandwich structures lies in the possibility to adapt mechanical properties like stiffness and strength of components to specified loads without changing the geometry or gaining weight.
After the compression tests, the rebound properties of pressurized and standard components were observed and compared.
Fillers are used to adapt the density, optimize the workability or to affect the thermal properties [4].
Here the amount of resin and fillers for the interlayer was increased from 500 g/m² to 1000 g/m² to optimize the bonding properties and to ensure a smooth transition from core properties to outer face properties.
The mechanical properties were examined with a bending test.
Online since: February 2018
Authors: Sergiy V. Divinski, Regina Post, Julia V. Osinskaya, Alexander V. Pokoev, Gerhard Wilde
Introduction The effect of magnetic field on thermodynamic and kinetic properties and microstructure evolution in ferromagnetic materials is known for a long time, see e.g. [1-4].
Moreover, texture and microstructure evolution in cold-rolled Al or Zr were found to be affected by a magnetic field, too [7, 8].
The sample surface was prepared by mechanical polishing using a Tegramin polishing machine and applying 0.5 µm diamond paste in the final step.
Aging at all investigated temperatures enhances the microhardness of the alloy by a factor of two to three with respect to the values after water-quenching.
Furthermore, it was found that the dislocation motion can be easily activated under uniform magnetic field in the absence of any detectable external mechanical action [17, 18].
Online since: September 2019
Authors: Nagwa E. Elzayady, Eltahry Elghandour
Improvement of mechanical properties of light-weight corrugated core sandwich structures is a big demand in aerospace applications.
The mechanical performance of corrugated fiberboard is investigated by Yali Ma, 2014 [5] who concluded that fiberboard can be greatly affected by the height and wavelength of corrugation.
The average results of the properties of the specimens and the specific properties to weight ratios are listed in Table 2.
The skin with high mechanical properties (Table 1) undergoes elastic buckling under compression load after the debonding between skin and core.
While the core with low mechanical properties is subjected to plastic deformation as well as crack propagation.
Online since: November 2016
Authors: Anizah Kalam, Noor Leha Abdul Rahman, Teng Wan Dung, Husna Elias, Koay Mei Hyie
These variablesare the main factors to affect the optimum conversion of Si into SiC using wood as the precursor.
Sepúlveda,.Microstructure and fracture properties of biomorphic SiC, Int.
Michael Scheffler, Cellular Ceramics Structure, Manufacturing, Properties,. wiley-vch, 2005
Rodríguez-Reinoso,The role of carbon biotemplate density in mechanical properties of biomorphic SiC, J.
Childers, Processing , Microstructure , and Mechanical Properties of Interpenetrating Biomorphic Graphite / Copper Composites,Northwestern university, 2014.
Online since: December 2012
Authors: Arul Maximus Rabel, Teena Abhraham, S. Karthick Raja Namasivayam
The coated fabrics were examined in the range of basic physical–mechanical parameters such as the tensile strength, the bursting strength and air permeability.Anti bacterial activity was determined against the clinical isolate of Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa by agar diffusion assay.
Moreover, functional finishes on textile fabrics are of critical importance to improve textile products with multifunctional properties such as antibacterial activity, UV protection, and wrinkle free properties.Nanotechnology is a highly emerging, inter disciplinary field, premised on the ability to manipulate structural materials on the level of individual atoms and molecules[2] The research interest for the use of nanotechnology in the textile industry has increased rapidly due to the fact that textile fabrics are some of the best platforms for deploying nanotechnology[3].With the advent of nanotechnology, a new area has developed in the realm of textile finishing.
Table 2 shows the effect of CUNp coating on the mechanical properties of cotton fabrics.
The strain reduced significantly in both warp and weft directions. the effect of nano-coating on cotton fabrics The CUNp coated fabric, due to its nano-size and uniform distribution, friction was found to be significantly lower.Air permeability is an important factor in the performance of textile materials used to provide an indication of the breathability of coated fabrics.
Effect of CUNPs treatment on mechanical properties of cotton fabrics Tensile strength Av. breaking load (kg) Strain (%) Treatment on fabrics Warp Weft Warp Weft Air permeability [m/(kPa.s)] Bursting strength (kg/cm2) Control 21×07 ± 2×10 18×79 ± 1×82 17×05 ± 1×72 13.07± 1×78 6×70 ± 0×89 4×30 ± 1×01 CUNPs 17×30* ± 1×35 20×61 ± 2×36 13×73 ± 1×10 11×60 ± 0×06 10×02 ± 1×77 5×56 ± 0×59 Table 3.
Online since: May 2012
Authors: Xiao Sun, Shu Zhong Wang, You Lian Lu
Foam fluid as a very complicated non-newton fluid, there are lots of factors including pressure, temperature, shear rate, foam quality, surfactant concentration and so on.
The rheological properties of foam fluid will abrupt change while the foam quality is 63%.
Influence of interfacial rheology on foam and emulsion properties [J].
Rheological Properties of Aqueous Foams for Underbalanced Drilling [C].
Foam mechanical at bubble scale [J].
Online since: January 2020
Authors: R.S. Santos, A.G. Barbosa de Lima, Severino Rodrigues de Farias Neto, Anderson Melchiades Vasconcelos da Silva, J.B. Silva Júnior
Due to this, it becomes important the knowledge of the drying effects on the materials and its physical, chemical and mechanical properties, once that those characteristics significantly affect the heat and mass transfer phenomena.
In this sense, high temperature gradients and high water evaporation rates are undesirable factors, making it necessary the control of the process [3].
Depending on the thickness of the studied material and external factors of the ambient air, the models can be classified in models of thin layer and thick layer.
The physic-chemical properties of the air and product are shown in Table 3.
Table 3 - Thermophysical properties of air and clay (ceramic brick) used in the simulations.
Online since: January 2006
Authors: Feng Xing, Zheng Liang Cao, Li Dong Huang, Liang Peng Deng
RPC is an ultra-high-strength, high-ductility, low-porosity cementitious composite material with advanced mechanical and physical properties.
RPC technology can create materials that extend from those with traditional heterogeneous characteristics normally associated with concrete to more homogeneous materials that have isotropic properties and energy absorption capabilities that approach the characteristics of metals [1-5].
This paper investigates the factors which have influences on the strength of RPC.
Testing The compressive strength and flexural strength are measured according to GB/T50081-2002, "Standard for test methods of mechanical properties on ordinary concrete".
[10] HUANG Li-dong, XING Feng, DENG Liang-peng, and HUANG Pei-hong: Study on Factors Affecting the Strength of Reactive Powder Concrete, Journal of Shenzhen University Science and Engineering, 2004, 21(2), pp. 178-182(in Chinese).
Online since: July 2006
Authors: Menno van der Winden, Daan M. Maijer, Mary A. Wells, H. Ahmed
In addition, the way the strain is partitioned in two-pass rolling cases affects the material stored energy with decreasing strain/pass providing the highest stored energy in the material after rolling and vice versa.
Introduction The control of the thermo-mechanical conditions imparted during hot rolling and the resulting microstructure in aluminum sheets is critical to determining the final sheet properties[1, 2].
Mathematical Model Finite Element (FE) Model A 2D thermo-mechanical model has been developed to simulate multi-pass hot rolling for aluminum alloys using the commercial finite element software package, ABAQUS.
This observation indicates that temperature is one of prime contributing factors to the strain partition effect illustrated in Figure 4.
It should be noted that changing the total strain during rolling in industrial practices affect the rolling load and can change the final sheet thickness and properties and thus application.
Online since: October 2008
Authors: Xiang Lin Gu, Nan Guo Jin, Xian Yu Jin
Experimental Study on Cracking Property of Self-Compacting Concrete Nanguo Jin1,a , Xianyu Jin1,b and Xianglin Gu2,c 1 Department of Civil Engineering, Zhejiang University,Hangzhou 310027,China 2 Department of Building Engineering,Tongji University, Shanghai 200092 ,China a jinng@zju.edu.cn, b xianyu@zju.edu.cn, c gxl@mail.tongji.edu.cn Keywords: self-compacting concrete, crack, characteristic age, ultimate flexural tensile strain Abstract: Taking free shrinkage as the key parameter in evaluating cracking of concrete, the cracking properties of self-compacting concrete with strength grade of C35 and C50 were investigated based on ring and slab restraint tests.
Actually, the cracking of concrete is the result of influence of multi-factors, including concrete mechanical properties such as elastic modulus, creep, tensile strength and calorific property like linear expansion coefficient.
So, all of the factors listed before, which will affect the cracking property of concrete, can be considered in the study to figure out the valuable results for the engineering application.
Ultimate tensile strain is a basic parameter in the study of concrete crack properties, and can be obtained by axial tensile test or flexural tensile test.
Comparing with common concrete, self-compacting concrete has better cracking property.
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