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Online since: December 2010
Authors: Qi Zhou, Ji Ping Hao, Ping Lv, Jin Jie Men
Curing agent and reactive diluent are important factors in strength.
Factors and levels of each sample are listed in Table 1.
Three factors and two levels are listed in Table 2.
The results [4] show that curing agent and reactive diluent are main factors which affect the strength of adhesive.
The most important factors that affected the tensile strength are curing agent and reactive diluent, where the influence on strength is almost the same.
Online since: January 2015
Authors: Simona Grigaliūnienė, Paulius Ragauskas, Artūras Kilikevičius, Jonas Sidaravicius, Vytautas Turla
Quality of prints and other printing products depends on many factors.
To the main factors that affect print quality, the optimization of printing process, as well as the use of printing high quality and the compatibility materials [1, 2] can be assigned.
Printouts change their physical properties (strength, surface roughness, friction, porosity) and elastic properties.
Wang, Advanced mechanical properties of graphene paper, J.
Skukis, Material properties identification.
Online since: November 2014
Authors: Qing Shan Gong, Min Luo, Yue Min Wu
But due to the complexity of its structure and the error analysis, and the diversity of the factors affecting error of convex contour surface, according to this processing priciple, can be concluded as cutting tool error, center distance error, offset errors and the cam rotary errors,and so on.
This article is about a method that author summarize in practice, and the error in calculating is certainly affected by some factors in other aspects, however, it can be regarded as an easy way in practical application. the method has been processed and verified by reality, and it has some practical value.
The analysis of cam parametric design and dynamic property of multihead complicated globoidal used in automatic tool changer.
The Development and Innovation of Mechanical and Electrical Products 2008.7
Online since: August 2013
Authors: Zhi Ming Han, Xing Wang Yang, Kai Zhao
Under the conduction of fatigue loads, the native microscopic defects (joints, cracks, holes) continue to expand and newborn micro-cracks constantly nucleate and expand which makes the rock mechanical properties deterioration gradually.
Upper limit stress S, stress amplitude R, cyclic number n, material properties a and environment T which affect the results of fatigue tests greatly were considerate comprehensive by using residual stiffness method.
And, its DV is the function of these factors mentioned above, viz., D=D(S,R,n,a,T).
This model can attribute the impact of many factors on rock fatigue to the attenuation of dynamic modulus, thus, is convenient for engineering applications.
He: Effects of cyclic dynamic loading on the mechanical properties of intact rock samples under confining pressure conditions[J] Engineering Geology, 125, (2012), p.81-89.
Online since: April 2014
Authors: Bernhard Karpuschewski, Joachim Döring, Gabriele Dietze, Ulrich Vorwerk, Cornelia Hahne, Fabian Klink, Michael Scheffler
This applies particularly to the drilling and milling properties.
Ideally, these correspond to the properties of the human bone.
Determination of biomechanical properties To recreate an authentic model of the human skull, which corresponds both in form and in the original feel, as a first step, the mechanical properties of the human skull must be determined.
Other essential factors which have been studied are the machining properties of the human skull bone.
This is necessary to reproduce artificial models with the same mechanical properties later.
Online since: August 2011
Authors: W. Sun, A.A. Becker, J.J. Kang
Effect of indenter geometries on material properties: A Finite Element simulation J.J.
These techniques can be used not only to obtain and to interpret the hardness of the material but also to provide information about the near surface mechanical properties, deformation behaviour of bulk solids and properties of coating films.
In particular, unloading curves from the indentation data contain information related to the material properties.
This may be attributed to differences in mesh refinement near the tip zone or other factors relating to the difference between the indenter geometries.
Despite having identical material properties and identical maximum applied displacements, there are differences between the loading-unloading curves obtained from FE simulations.
Online since: June 2014
Authors: M. Vasumathi, Murali Vela
Compared to glass, carbon with its captivating properties was more prevalent from then onwards.
These laminated composites showed significant properties in comparison with random oriented composites.
This laminated structure behaves much the same as a simple metal structure, but with considerable specific advantages with regard to properties, such as metal fatigue, impact, corrosion resistance, fire resistance, weight savings and specialized strength properties.
Their efficient use as structural material has been restricted due to less known factors about buckling design criteria.
The knowledge about these factors would aid in stable design of structural components like aircraft fuselage, helicopter rotor blades, missiles, stiffeners [5].
Online since: November 2013
Authors: Feng Zhao, Yan Jing
Therefore, its processing efficiency is particularly high, and the surface roughness can generally reach Ra0.1 ~ 0.2μm. [2] 1- Guide sleeve; 2- Rough boring tool; 3 - Floating boring tool; 4 - Cutter body; 5 - Roller; 6 - Force transfer body; 7 – Median septum; 8 – Raceway nest; 9 - Rear bulkhead; 10 – Half watt; 11 - Thrust bearing; 12 - Bearing housing; 13 - Boring bar Fig.2 The structure of boring-rolling compound tool Analysis of influencing factors in rolling process: Cylinder surface suffers the most significant and the most sufficient plastic deformation in the first rolling, its surface quality then is significantly improved, but the subsequent effect will be not so evident any more; in contrast, with the increase of rolling frequency, the surface will produce excessive pressure stress, and then the surface quality obtained in the first rolling will suffer destruction, therefore, in the actual production, one-rolling process is used generally.
Rolling allowance: During the rolling process, when the compression of the workpiece is in the range of 0.1-0.2mm, the rolling effect will be the best. [3] Feed rate: Feed rate has a great influence on the micro-geometry shape and the physical and mechanical properties of the workpiece surface; when the rolling depth is under certain conditions, the fatigue strength will increase with a decreasing feed rate.
Rolling speed: Rolling speed is the linear speed of rolling workpiece rotation, and the level of rolling speed can affect not only the productivity but also the rolling quality.
Workpiece requirements: If the workpiece’s hardness is too low, and the mechanical properties are also poor, which can not achieve the desired rolling effect, hardness of the material should not be less than 140HB before rolling process; and after the rolling, the hardness starts from 280HB, the rolling effect is decreased significantly.
The rigidity of the boring bar will also affect orientation and processing quality, so the boring bar should have sufficient strength and rigidity. 
Online since: July 2014
Authors: Hong Li, Hong Xia Ding, Shang Yu Han
Abstract.There are many uncertainty factors which can influence the carrier pile design and construction, some of them can lead the deformation characteristic of carrier pile more complex, especially the carrier pile shape parameter.
Based on the engineering investigation and survey results, the main physical and mechanical index of the model can be determined as Tab.1.
Fig.1 Finite element simulation model of carrier pile foundation treatment Tab.1 Main physical and mechanical index of the model Project Sandy silt calculated values Sandy clay calculated values gravity densityρ(×103kg/m3) 1.96 2.01 cohesive force C(kPa) 6.2 18.2 Friction angle Φ(º) 27.5 27.5 Deformation modulus Es(MPa) 15.5 12.5 With back-analysis method based on the actual situation and on-site test results, the origin shape parameter and pile index can be determined; its results are shown in Tab. 2 and Tab.3.
Tab.2 Physical and mechanical parameters of carrier pile and soil Material Type gravity density ρ×103kg/m3 cohesive force c/kPa internal friction angle/( º) elasticity modulus E/(Mpa) Poisson's ratio u Reinforced concrete 22 — — 3.5×104 0.2 Plain concrete 20.5 — — 2.2×104 0.2 Dense gravel soil 19.5 10 30 80 0.27 Compacted area 1 19 35 10 60 0.27 Compacted area 2 17.7 35 8 55 0.27 Soil between piles 19.6 30 10 33 0.27 Tab.3 Shape parameter of carrier pile summary Carrier size Plain concrete Density gravel soil compacted area one compacted area two thickness(m) 0.3 0.3 0.25 0.28 width(m) 0.58 2.16 2.56 3.12 Carrier Size Influence The main difference between carrier pile and conventional pile is the carrier pile has one expanding carrier at the bottom of the pile, and this expanding carrier can change the bearing capacity and deformation characteristic of the pile.
B.Changes the carrier size can affect the deformation properties of the pile more prominent, and the carrier pile’s resistance to deformation performance will upgrade more substantial when the volume of the plain concrete expand 1.1 to 1.2 times to the current design parameters.
Online since: July 2012
Authors: Zhao Yang Guo, Guo Hui Shen
The factors affecting tire-pavement noise spectrum were analyzed, such as temperature, speed, age of pavement and so on.
The dense asphalt-rubber pavement was the most widely used in urban road in the last decade, whose nominal maximum aggregate sizes were mainly 13mm or 10mm. [1] However, its noise reducing properties is not well known compared with other asphalt pavement.
Research Institute of Highway Ministry of Transportation was asked to conduct the research. it had studied acoustic properties and mechanical properties of several types of asphalt mixture used in Beijing with the help of advanced test equipment, such as Simple Performance Tester, Universal Testing Machine, Asphalt Pavement Analyzer, Reverberation Room.
The factors affecting tire-pavement noise spectrum were analyzed, such as temperature, speed, age of pavement and so on.
The master curve of dynamic modulus is fitted with Sigamodal function, and the master curve of phase angle is fitted with Gauss curve and adopted the same shift factor as dynamic modulus master curve.
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