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Online since: August 2011
Authors: Dirk Biermann, M. Feldhoff
Introduction The continuous increase of the application of fibre reinforced plastics (FRP) is based on the constant enhancement of their mechanical and thermal properties, resulting in higher specific strength and stiffness, which is used especially for dynamically moved components.
The delamination factor for every single tool exit side from the analyzed surface ratios was calculated.
Drilling holes using the grain size D126 results in a high delamination factor especially at feed rates higher than f = 0.08 mm/rev.
The delamination factor can be kept below DF = 0.2 up to a feed of f = 0.1 mm/rev for the tool with the D301 grain size.
The diameter deviation of the drill hole is strongly affected by the dynamic resilience of the machining centre and thus the programmed cutting speed.
Online since: August 2015
Authors: Jacek Magiera
Introduction Many factors affect rail performance and one of the most important is the residual stress [1].
Orringer, How residual stresses can affect rail performance, in: J.J.
Richardson, M.J Wood, Control of straightening operations for optimisation of product properties.
Proc. 39th Mechanical Working and Steel Processing Conference, Vol. 35.
Online since: October 2010
Authors: Patrizia Miceli, Antonello di Donato, Umberto Martini
The effects of the chemical interaction between slag and refractory on the physical and chemical properties of the slag, such as viscosity, melting point, change of composition, solid phase formation, were also investigated.
Which of the two phenomena plays the most important role in refractory failure is depending on the variety of chemical and physical factors of the whole system.
Since slag viscosity is strongly affected by the presence of solid particles, different equations have been proposed in the literature [18,19] to calculate the viscosity taking into consideration the presence of second phases.
Application of Selection Criteria and Tools to Industrial Refractories Selection of refractory among materials with appropriate thermo-mechanical properties, must fulfil the requirements of corrosion resistance but, at the same time, it is necessary to avoid detrimental effects on the slag quality due to uncontrolled increase of viscosity or contamination with hazardous species (like Cr2O3).
Online since: January 2014
Authors: Yun Long Li, Chang Lu Zhao, Yang Yang Liu, Qian Peng, Chang Jiang Li
In order to study the special vehicle engine compartment thermal balance test accurately, eliminate the influence of unstable factors such as engine and obtain more accurate testing parameters, this paper put forward the concept that research engine compartment thermal balance in real vehicle through simulation test.
Usually the measuring segment would affect the measurement section flow field, causing local turbulence and velocity distortion.
According to the following formula , we can get the physical property parameter of the air
We can also see from the above formula that temperature has a great effect on the physical property parameter of the air, but humidity does not.
As shown in figure 4.Eliminating error of measurement and calculation error, cold and hot heat difference .So we can make a preliminary judgment that other factors add the heat dissipating capacity at the cooling air side.
Online since: January 2010
Authors: Toshihiko Sasaki, Osama Yaguchi, Yuichi Kobayashi
In these models, residual stress is one of the most important factors that affect crack growth [1] and is relatively difficult to obtain enough data.
The chemical composition and the mechanical property are shown in Table 1.
The difference between σx and σz, as shown in Fig.5 (b), was investigated in order to avoid the influence of error due Table 1 Chemical composition and mechanical properties of rail used in this study.
Online since: January 2010
Authors: S. Torizuka, Eijiro Muramatsu
However, for practical applications of these ultrafine grained steels, it is essential to evaluate their mechanical properties and understand the microstructure-mechanical property correlation in detail.
Reduction in area is affected by second phases and inclusions.
Measurement of grain boundary misorientation was carried (1)Uniform elongation (2)Non- uniform elongation (%) 100 0 0 x S S S RA − = Nominal Strain (3)Reduction in area Fig.1 Three factors regarding formability.
Online since: June 2017
Authors: Bo Yang Liu, Bin Bin Liu, Feng Ye
With the structural relaxation, both the mechanical and physical properties vary in dependence of the annealing time.
Previous studies revealed that the electrical resistance changes due to structure relaxation (R-relaxation = ρrelaxed - ρunrelaxed) could be affected by the composition of amorphous alloys[12].
The basic features of such complicated behaviors have been attributed to different origins, such as free volume relaxation [13,16], compositional/topological short-range ordering [17]; some peculiarities of the activationenergy spectra [18] and change of the structural factors implied by the Ziman theory for the resistivity of liquid metals [13,19,20].
This suggests that the heat treatment at 445 K affects the electrical resistance in glass transition region.
Online since: February 2011
Authors: Chao Hui Zhang, Si Si Liu, Han Bing Zhang
Meniscus and Viscous Forces during the Nanoscale Separation of Sphere-on-sphere Contact Surfaces Sisi Liu1, a, Chaohui Zhang1, b and Hanbing Zhang1, c 1School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, China100044 a09116326@bjtu.edu.cn, bzhhzhang@bjtu.edu.cn, c09121851@bjtu.edu.cn Keywords: Meniscus Force, Viscous Force, Dynamic Contact Model, Contact Angle, Wettability Abstract.
Cai [7] had focused on the effect on adhesive forces of factors such as the size of the surface, liquid properties and operating conditions.
The volume is unchanged in the separation, so it is one of the most important parameters affect the fracture height.
Analytical models have been presented in the past to determine how separation time affects adhesion force in ambient air.
Online since: December 2007
Authors: Carlos H. Cáceres, A.H. Blake
There are two additional factors to consider: twinning, and the development of short range order (SRO) in the concentrated alloys.
Twinning only effect if to slightly shift the K-M curves to the right in pure Mg and the lower alloys in Figs. 8 through 9, but it does not affect their maximum slope, suggesting than the rate of athermal hardening is not changed by twinning [1].
Zn in solution does not affect the rate of athermal strain hardening.
Seeger, in: Dislocations and mechanical properties of crystals, edited by J.C.
Online since: October 2010
Authors: Andrea Penna, Ilaria Senaldi, Guido Magenes
Keywords: Response, masonry, building aggregate, row conglomeration Introduction Problem Overview A building aggregate is constituted by an assemblage of masonry buildings which is a result of an articulated, but not unitary origin, due to multiple factors that determine the evolution of its characteristics in time.
As frequently seen in Italy in many historical town centres subjected to earthquakes, the potential interactions due to the structural contiguity within the aggregates is one of the main factors influencing the seismic response and damage mechanisms.
Furthermore, the analysis of the constructive technique and of its workmanlike application is needed to examine the mechanical characteristics of the construction materials.
Other vulnerability factors should also be investigated, such as the characteristics of the open spaces in between buildings, which may affect the relationship between the dimensions of the internal areas with the front portion of the building, or the relative height of adjacent buildings and the degree of connection between them.
The material is characterized by properties typical of undressed stone masonry with facing walls of limited thickness and infill core, with elastic modulus E=1450 N/mm2, shear modulus G=108 N/mm2, specific weight ρ=23 kN/m3, compressive strength fm=3.2 N/mm2, shear strength τm=0.05 N/mm2.
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