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Online since: May 2012
Authors: Ming Pang, Chang Zhen Liu, Guang Hui Xu, Jun Hua Ma
It causes chemical inhomogeneity in the structure and hence is detrimental to the mechanical properties.
The present work is pursued in this direction and the paper reports various factors that affect the formation and control of Laves phase as a result of segregation in K418 and 42CrMo dissimilar metal laser welding.
Laves phase is detrimental to mechanical properties of joint.
It should be noted that segregation is a time-dependent phenomenon and hence is strongly affected by the weld cooling rate, as influenced by various factors like heat input etc.
The factors G and R also control the amount of supercooling during weld solidification, which determines the extent of segregation.
Online since: May 2004
Authors: O. Addemir, Filiz Çinar Şahin, M.E. Cura, Dimitar D. Radev
These studies aimed on improvement of mechanical and microstructural properties of the material [6,7].
It is directly affected by the factors that control hardness, namely composition and structural properties [9].
Results and Discussion Mechanical properties of the WC-Co system had been affected in presence of boron carbide.
Mechanical properties achieved B4C Content (w%) Density (%T.D.)
The fine particle sizes of starting materials are a precondition for high mechanical properties of the end dense product.
Online since: May 2013
Authors: Xun Guo Zhu
Through analyzing the stress distribution feature and stress distribution tendency and affection factors, the affection factors to anchoring results is the dilatancy angle.
Therefore, it is necessary that constructing security support to ensure the safety of personnel and equipment and other property.
Rock mass of the two areas have different mechanical parameters.
The factors affecting the stress distribution of the rock bolt It can be seen from the above calculation formula, the factors affecting the distribution of anchor stress Including bolt and the surrounding rock mass mechanical parameters.
Those were studied in detail In the Literatures [9-10] impact bolt stress distribution factors, such as the length of the bolt, bolt anchor installation time as well as the surrounding rock mass mechanical parameters, Such as elastic model of the rock mass, Poisson's ratio.
Online since: August 2006
Authors: H.R. Sinning
A high-temperature background also exists in decagonal Al-Ni-Co up to 1000 K or even 1200 K; in that case, however, there is no such huge difference in activation parameters (especially as concerns the pre-exponential factors) like that between peaks A and B in Al-Pd-Mn [5].
Trebin, ed., Quasicrystals, Structure and Physical Properties, Wiley-VCH, p. 338 (2003)
Trebin, ed., Quasicrystals, Structure and Physical Properties, Wiley-VCH, p. 523 (2003)
Trebin, ed., Quasicrystals, Structure and Physical Properties, WileyVCH, p. 536 (2003)
Trebin, ed., Quasicrystals, Structure and Physical Properties, Wiley-VCH, p. 2 (2003)
Online since: October 2014
Authors: Y.S. Kong, Mohd Zaidi Omar, L.B. Chua, S. Abdullah
To determine the fatigue life of the parabolic leaf spring, material properties input to the design is important.
Chemical composition differences between SAE 5160 and SAE 51B60H have significant effects on the mechanical properties and fatigue life.
On the other hand, selection of spring material is also one of the factors that may affect the fatigue life of the leaf spring.
It adopts material S-N curves to calculate for stress concentrations, empirical modification factors for surface finish effects and mean stress effects.
Mechanical properties of the spring material SAE 5160 and SAE 51B60H is listed in Table 2.
Online since: March 2007
Authors: J.D. Chen, Y.J. Shi, W. Zhang, L.D. Wang, M. Zhu, W.M. Zhou, Guo Ding Chen
At present, the investigation of LUHSBS is mainly focused on rationally adjusting the coordination of chemical composition and optimizing the heat treatment technology (especially cooling and tempering technology)�which can obtain the smaller sub−structure for BF and more stably AR, further enhance the toughness and plasticity on the basis of the ultra−high strength level and reveal the several critical factors affecting remarkably mechanical properties.
Experimental results 3.1 Mechanical properties Table 1 shows the experimental results of the mechanical properties and volume fraction of AR for a series bainite steels developed newly and the 23MnNiCrMo reference steel.
Obviously, the heat treatment techniques make strong influence on the specific external shape and arrangement formation of the shear units as well as the average size of irregular sub−grains, which further affects the mechanical properties of LUHSBS.
Tomita Y, Okawa T: Effect of modified heat treatment on mechanical properties of 300 M steel, Mater.
Tomita Y: Mechanical properties of modified heat treated silicon modified 4340 steel, Mater.
Online since: October 2013
Authors: Ying Deng, Dan Zhang, Feng Zhou, De Tian
Load variation and loading rate are key factors affecting wind turbine stability and life cycle.
Even though we adopted the mechanical system model, the whole wind turbine model is still nonlinear because of characteristics Based on blade element momentum theorem, the load acting on each blade root is mainly affected by two factors: relative wind speed variation vfi and pitch angle variationβi.
It consists of the stochastic disturbance. z(t) is the signal that allows to characterize whether a controller has certain desired properties and is called controlled variable or performance variable.
For mechanical structure with several degrees of freedom, the Lagrange equation: ddt∂Ek∂qi-∂Ek∂qi+∂Ed∂qi+∂Ep∂qi=Qi, (10) Ek, Ed andEprefers to kinetic energy, consumed energy and potential energy respectively.
Conclusion Fatigue loads affect the performance, safety operation and life cycle of wind turbine.
Online since: November 2012
Authors: Shu Shan Li, Wei Xie, Deng Kui Yuan
The coarse aggregate is one of the elements in concrete, its property affects the strength of concrete prominently.
In order to improve the strength of concrete, we must consider the three factors.
Overview of the Test Properties of Materials.
Water cement ratio, age, the maximum aggregate size of the three factors on the cube compressive strength is shown in Fig. 1.
Water cement ratio, age, the maximum aggregate size of the three factors on the flexural strength is shown in Fig. 2.
Online since: June 2013
Authors: Sheng Zhu, Kuang Min Wei, Chuan Yin Lu, Li Qiang Wu
Truncation error is one of the main factors of scale effect of densities of rock-fill materials.
Scale effect was defined as the differences of physical and mechanical properties between indoor tests and in-situ tests.
The measurement of soils properties in the triaxial test [R].
Evaluation of properties of rockfill materials [J].
Mechanical properties of rockfill [A].
Online since: January 2012
Authors: Asif Israr, Atiq Ur Rehman, Musharaf Abbas
This misalignment produce in the vessel’s structure is because of girth weld that is evident in most of the fabrication of such type of structures apart from other factors which is beyond the scope of this study.
Such discontinuities affect overall stress pattern in the affected area that can be visualized in the local increase in the stress magnitude.
The vessel section is modeled in Auto Mechanical Desktop and is then imported in ANSYS in ASIC Desktop (.sat) format.
Design factor of safety on yield and tensile are 1.4 and 1.65 respectively, and the constraint on factor of safety on yield and tensile are 1.3 and 1.5 respectively.
In this regard, the designer must not be content to understand the properties of the construction materials to be used in the vessel.
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