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Online since: June 2013
Authors: Chin Jian Leo, Henry Wong, Yong Zou
Being a thermo-viscoelastic material, the mechanical properties of EPS geofoam are affected by temperature.
All of Findley’s material parameters (nF, mF, e0F, seF, and smF) were assumed to be: (1) material dependent; (2) stress, strain, and time independent (for the stress-strain range over which the material parameters are determined); and (3) dependent on various environmental factors such as temperature and water content of the material.
Viscoelastic Mechanical Models.
This would suggest that the influence of temperature on the creep model affects mainly the viscous elements while the spring element is approximately independent of the temperature in the specified stress range.
[4] Melo Jose Daniel D. and Radford Donald W: Time and temperature dependence of the viscoelastic properties of CFRP by dynamic mechanical analysis.
Online since: February 2008
Authors: Yvan Houbaert, Lucia Suarez, Juergen Schneider
In this paper, the characteristics of the high temperature oxidation properties of Fe-Si alloys are discussed in terms of oxide growth mechanism, kinetics and phase morphology.
Moreover, the scale properties affect the final steel surface quality and its response to further processing.
Controlling the oxidation kinetics and mechanical properties of the oxides can then simplify pickling and improve the steel downstream behaviour [1].
The reaction of an oxidant and a metal may depend on a number of factors Depending on temperature, time, atmosphere conditions and steel chemistry, energy barriers develop, which must be overcome for an oxide to grow.
The presence of these defects will affect transport of reactants through the scale.
Online since: September 2011
Authors: Xin Yi Hu, Lei Tan, Qiu Mei Wang, Jing Gao
High ultimate strain, short molding cycle, recyclability and re-processibility are some of the driving factors for their increasing uses.
Using this way, composites with required mechanical properties for engineering applications can be projected and fabricated with a high flexibility in fiber kind selection and their proportions as well as laying-up method of fabrics[1].
And the yarns in fiber bundles would not straight with lighter molding pressure, which also leads to bad mechanical properties of composite laminate.
The processing parameters should be optimized in order to decreased the void and obtain the high properties of composites.
Hence, the mechanical properties of the composites will be satisfied.
Online since: March 2004
Authors: Qiu Sheng Yan, Zi Qiang Zhang
Introduction For the development of Micro Electro Mechanical System (MEMS), micromachining technology of three-dimensional structure shape of micro parts is one of the key technologies.
The fracture toughness and hardness of the target materials are critical parameters affecting the material removal rate in AAJM process of engineering ceramics.
The powder velocity varying the applied pressure p and the distance d between the nozzle and the surface of workpiece are two key factors.
Some investigations on the machined surface properties of AAJM have been carried out.
The effect of AAJM on the mechanical properties of the workpiece whether or not it results in any strength degradation should be carefully taken into consideration, but no strength degradation took place for the AAJM of ceramics surface (damage-free) by comparing the lapping samples and AAJM samples with the 4-point bending test [8-13].
Online since: April 2011
Authors: Jun Xie, Qi Zhi Yang, Pei De Bao, Xiao Qin Yin, Lu Zhong Ma
Introduction Gear transmission is one of important mechanical transmissions.
Distribution of EHL Film Thickness and its Influence Factors Distribution of EHL film thickness.
The distributions of the EHL film thicknesses on meshing line The influence factors on gear lubrication and minimum film thickness.
The oil viscosity will then decrease and affects on the lubrication negatively.
Machine and Mechanical Design [M].
Online since: March 2013
Authors: Ming Yang Wu, X.L. Liu, Y.N. Cheng
Cheng1 1College of Mechanical & Power Engineering, Harbin Univ. of Sci. and Tech, Harbin 150080, P.R.
Introduction In milling the adhering disrepair is an important factor that affects the normal running of the roboticized equipment.
The modal property directly affects dynamic performance of cutter, and the effective modal shape and natural frequency are sensitive to structure and local damage of cutter.
Tao, Chinese Journal of Mechanical Engineering 36, (2000) 10-15
Dou, Frontiers of Mechanical Engineering in China, 3 (2008) 2-5
Online since: January 2010
Authors: Fei Han, Zheng Qing Ai, Ji Ying Liu, Zuo Jun Jing
The part geometry is greatly dependent on the selection of input control variables such as mechanical properties of the workpiece, shapes of the products desired, engineers often face with the problem of selecting appropriate and optimum combinations of input control variables for the required part quality.
Numerical simulation procedure Material properties.
A series of tensile tests were conducted to experimentally determine the material properties for input into the simulation, the main mechanical properties can be shown in Table 1 and Fig.1 shows the stress-strain curve for the blank.
Table 1: Mechanical properties of material model Parameter Notation Value Material DOC Roll 1000 steel Yield strength/MPa s 901 Ultimate tensile strength/MPa b 984 Ultimate elongation/%  9 Young's modulus/MPa E 2.1E5 Density/(g/cm 2 )  7.85 Poisson's ratio  0.30 Strain-hardening exponent n 0.08 Anisotropy Coefficients r r0=0.72, r45=0.83, r90 =0.98 Fig. 1: The curves of stress-strain FE model setup.The flower pattern for the U-channel was designed with COPRA software (shown in Fig. 2).
The authors are grateful to SSAB for providing mechanical properties data of ultra high strength steel in the simulations.
Online since: December 2009
Authors: Majid Abbasi, S. Kheirandish, Y. Kharrazi, J. Hejazi
Introduction Wear is not a material property; however, it is a systems response [1].
Tables 1 and 2 show the chemical compositions, the mechanical and the physical properties of the experimental steels respectively.
Microstructure, mechanical and physical properties of experimental steels.
It is important to note that type of abrasive particles of the wheel, its size and the space between grains, the type of binder, and the strength of wheel are important factors in selection of abrasive wheel [25].
Goldenstein: Room Temperature Mechanical Properties and Tribology of Nicralc and Stellite as Cast Alloys, The 5th Brazilian Materials Research Society Meeting, Brazil, October 8-12 (2006)
Online since: July 2012
Authors: Xiao Xue Liao, Shuang Quan Liao, Yan Fang Zhao, Ming Chao Luo
When modified WRP is added into rubber matrix, the mechanical properties of composite and compatibility between virgin rubber and WRP are improved.
On the one hand, B whose the lowest crosslinking results in the best flexibility is good for dynamic mechanical properties.
On the other hand, the existence of B impairs physical and mechanical properties of virgin rubber/WRP compound.
So the direct use of WRP is limited by the negative effects on mechanical properties of compounds.
Unfortunately, this method usually cuts off the main rubber chains, which impairs mechanical properties of vulcanizates.
Online since: December 2023
Authors: Glenn Carlo M. Miranda, Persia Ada N. de Yro
Gold [Au] wires have always been to the first choice of material for the wires, ranging from purities of 2N (99%) to 4N (99.99%), due to its electrical and thermal properties.
The rate at which the heat is dissipated along the wire is dependent on the material’s thermal properties.
The solid-state reaction of various binary metal systems behaves differently, as different metals have different atomic properties and behavior.
The design of the experiment has three center points, and two levels with three factors: US Energy (Current), Force and Initial Force.
Among these three (3) factors, only the US Energy (Current) parameter will only be the variable, the other two will be constants.
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