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Online since: May 2011
Authors: Yin Huan Yang, Lin Zhi Wu, Zhen Gong Zhou, Ying Guo
Material properties and model.
The mechanical properties of the adherends and adhesive are given in Table 3 and 4, respectively.
According to the simulation results, it is an important factor that peel stress affects joint strength.
According to the simulation results, it is an important factor that peel stress affects joint strength.
It is the main factor that peel/shear stress concentrations at overlap region ends affect the joint strength.
The mechanical properties of the adherends and adhesive are given in Table 3 and 4, respectively.
According to the simulation results, it is an important factor that peel stress affects joint strength.
According to the simulation results, it is an important factor that peel stress affects joint strength.
It is the main factor that peel/shear stress concentrations at overlap region ends affect the joint strength.
Online since: March 2014
Authors: Anghel Cernescu, Heikki Remes, Jani Romanoff, Pauli Lehto
For all tests, the crack closure effect is more pronounced at low stress intensity factor range (in the threshold domain).
1.
Also, the analysis was performed on the base material, following that in the second part of the study to be analyzed the fatigue crack growth rate in welded metal and HAZ (Heat Affected Zone).
Also, the components of the web core sandwich panel were made of steel S355J2G2 and respectively S235JR, whose nominal mechanical properties are given in Table 1.
The nominal mechanical properties of the materials of web core sandwich panel components.
Also, during the tests the crack closure load, Pcl, was determined and respectively the closure stress intensity factor, Kcl, based on which was calculated the effective stress intensity factor range, ΔKeff, using Equation 1.
Also, the analysis was performed on the base material, following that in the second part of the study to be analyzed the fatigue crack growth rate in welded metal and HAZ (Heat Affected Zone).
Also, the components of the web core sandwich panel were made of steel S355J2G2 and respectively S235JR, whose nominal mechanical properties are given in Table 1.
The nominal mechanical properties of the materials of web core sandwich panel components.
Also, during the tests the crack closure load, Pcl, was determined and respectively the closure stress intensity factor, Kcl, based on which was calculated the effective stress intensity factor range, ΔKeff, using Equation 1.
Analysis of Influence Factors for the Contact Length between Wheel and Workpiece in Surface Grinding
Online since: November 2007
Authors: Zhi Xiong Zhou, Du Yi Gu, Cong Mao, De Wang Zhou
Analysis of Influence Factors for the Contact Length between Wheel
and Workpiece in Surface Grinding
Cong Mao1,a
, Zhixiong Zhou
1
, Dewang Zhou1 and Duyi Gu
1
1
College of Mechanical and Automotive Engineering, Hunan University,
Changsha, China, 410082
a
maocong315@yahoo.com.cn
Keywords: Grinding process, Contact zone, Contact length, Influence factors
Abstract.
It is found that the grinding conditions and the properties of work material have effects on the contact length, moreover, the mechanism of which is discussed in this paper.
Many factors have to be taken into account such as the deformations of the workpiece and the wheel caused by forces and heat, uneven distribution of the grains on the peripheral surface of the wheel, and dressing condition etc
In Fig.8, Ld, which is gr LL − , is the increment of contact length affected by grinding parameters excluding the cutting depth, such as maximum grinding temperature Tmax and grinding force.
It is expected that both the mechanical strength of the abrasive grains and the gripping strength of the bonding material of the wheel deteriorate.
It is found that the grinding conditions and the properties of work material have effects on the contact length, moreover, the mechanism of which is discussed in this paper.
Many factors have to be taken into account such as the deformations of the workpiece and the wheel caused by forces and heat, uneven distribution of the grains on the peripheral surface of the wheel, and dressing condition etc
In Fig.8, Ld, which is gr LL − , is the increment of contact length affected by grinding parameters excluding the cutting depth, such as maximum grinding temperature Tmax and grinding force.
It is expected that both the mechanical strength of the abrasive grains and the gripping strength of the bonding material of the wheel deteriorate.
Online since: July 2017
Authors: Hong Li Liu, Hong Yan Li, Ai Wu Yang, Jian Guo Zhou, Li Meng Song, Yong Qiang Fu, Ru Yi Li, Cong Sun
The thermal stability of the composites was influenced by three main factors, and the total effect of the three factors on thermal stability illustrated a negative trend.
1.
The thermal stability of the composites were affected by three main factors, and the total effect of the three factors on thermal stability illustrates a negative trend.
Multiscale modeling and mechanical properties of zigzag CNT and triple-layer graphene sheet based on Atomic Finite Element Method.
Improving the mechanical properties of graphene oxide based materials by covalent attachment of polymer chains.
High performance polyurethane/ functionalized graphene nanocomposites with improved mechanical and thermal properties.
The thermal stability of the composites were affected by three main factors, and the total effect of the three factors on thermal stability illustrates a negative trend.
Multiscale modeling and mechanical properties of zigzag CNT and triple-layer graphene sheet based on Atomic Finite Element Method.
Improving the mechanical properties of graphene oxide based materials by covalent attachment of polymer chains.
High performance polyurethane/ functionalized graphene nanocomposites with improved mechanical and thermal properties.
Online since: June 2013
Authors: Wei Hua Song, Hong Wei Zhang
Introduction
Coal and gas outburst is a very complicated dynamic phenomenon, which is affected by many factors such as in-situ stress, gas pressure, physical and mechanical properties of coal and rock.
Hanes believed that stress and gas are playing important roles in coal and gas outburst, but some factor is in dominant sometimes [1].
Geological structures in NW direction are performing for pressure and twist properties, which is mainly in extrusion, shearing functions.
Mechanics analysis of the causes for coal and gas outburst Coal and gas outburst is a kind of complex dynamic phenomenon, mainly affected by many factors such as in-situ stress, geological structures, gas pressure and physical and mechanical properties of coal and rock.
At the same time, the mechanics properties are also differences.
Hanes believed that stress and gas are playing important roles in coal and gas outburst, but some factor is in dominant sometimes [1].
Geological structures in NW direction are performing for pressure and twist properties, which is mainly in extrusion, shearing functions.
Mechanics analysis of the causes for coal and gas outburst Coal and gas outburst is a kind of complex dynamic phenomenon, mainly affected by many factors such as in-situ stress, geological structures, gas pressure and physical and mechanical properties of coal and rock.
At the same time, the mechanics properties are also differences.
Online since: July 2009
Authors: V.A. Krashaninin, Svetlana Oglezneva, Andrey N. Dmitriev, V.I. Bulanov
., Ekaterinburg, 620016, Russia.
2
The Perm State Technical University,
Centre of Science of Powder Materials, Perm, 614013, Russia
a
bulanov27@mail.ru bdmi_imet@r66.ru,
ckrash@ural.ru dosa@pm.pstu.ac.ru
submitted: 9 July 2008 revised: 26 August 2008 accepted: 26 November 2008
Keywords: Powder, Composition, Structure, Properties, Nanosystem, Homogenization,
Mathematical modeling.
The obtained results will allow the reduction in the number of real experiments in the creation of new materials with required properties.
The objects of the study are powdered systems obtained by a method of mechanical alloying.
For the exploration of physic-chemical and physic-mechanical properties of the studied powder materials depending on the composition, temperature and caking time prototypes are fabricated by two-sided pressing in hard press molds.
Now there are no functions of such characteristics in an explicit form on which it would be possible to predict properties of composites or the conditions of their process engineering.
The obtained results will allow the reduction in the number of real experiments in the creation of new materials with required properties.
The objects of the study are powdered systems obtained by a method of mechanical alloying.
For the exploration of physic-chemical and physic-mechanical properties of the studied powder materials depending on the composition, temperature and caking time prototypes are fabricated by two-sided pressing in hard press molds.
Now there are no functions of such characteristics in an explicit form on which it would be possible to predict properties of composites or the conditions of their process engineering.
Online since: September 2008
Authors: Fernando Martínez, E. Tynan, M. Arregui, G. Obieta, J. Aurrekoetxea
The behaviour of the sensor to impact is also compared to the response in
static, and the different factors affecting the sensor response in both conditions are described.
Yang: Characterization of the residual mechanical properties of woven fabric reinforced composites after low-velocity impact (International Journal of Mechanical Sciences 47 (2005) 647)
Yang: Characterization of the residual mechanical properties of woven fabric reinforced composites after low-velocity impact (International Journal of Mechanical Sciences 47 (2005) 647)
Online since: April 2014
Authors: Sui Xing Zhang, Wei Wei An, Xiao Li Zhao, Zhan Shan Liu, Hai Chao Yu
Under normal circumstances the formation of surface wrinkling cannot be artificially controlled so that wrinkles or buckles are usually considered as the harmful factors to be eliminated in most cases [1].
Surface wrinkling appears until the compressive stress induced by thermal expansion during deposition is greater than critical stress which depends on film thickness and physical properties of film and substrate.
But the cracks don’t affect shape restoration.
Within reasonable limits, wrinkled surfaces can be transformed without affecting its performance. 50μm 50μm 50μm 50μm 50μm (a) (f) (e) (d) (c) (b) Fig. 4 Wrinkle evolution in an Au/PDMS bilayer under different strain: (a) Schematic diagram, (b) 0%, (c) 5%, (d) 10%, (e) 15%, (f) 20%.
Stafford, Surface wrinkling: A versatile platform for measuring thin-film properties, Advanced Materials, Vol. 23, Issue. 3 (2011) pp. 349–368
Surface wrinkling appears until the compressive stress induced by thermal expansion during deposition is greater than critical stress which depends on film thickness and physical properties of film and substrate.
But the cracks don’t affect shape restoration.
Within reasonable limits, wrinkled surfaces can be transformed without affecting its performance. 50μm 50μm 50μm 50μm 50μm (a) (f) (e) (d) (c) (b) Fig. 4 Wrinkle evolution in an Au/PDMS bilayer under different strain: (a) Schematic diagram, (b) 0%, (c) 5%, (d) 10%, (e) 15%, (f) 20%.
Stafford, Surface wrinkling: A versatile platform for measuring thin-film properties, Advanced Materials, Vol. 23, Issue. 3 (2011) pp. 349–368
Online since: August 2014
Authors: Fang Jung Shiou, Assefa Asmare Tsegaw
ANOVA analysis was carried out to determine the main factors which would affect the surface roughness significantly.
It has good physical and chemical properties and it's used often as a standard of comparison.
Quality of the process measured in terms of the particular target response to noise factors and signal factors.
Control factors Measured Ra, [µm] S/N Mean No.
[15] SCHOTTGLAS, Optical glass in: description of properties, Germany, 2000, pp. 6
It has good physical and chemical properties and it's used often as a standard of comparison.
Quality of the process measured in terms of the particular target response to noise factors and signal factors.
Control factors Measured Ra, [µm] S/N Mean No.
[15] SCHOTTGLAS, Optical glass in: description of properties, Germany, 2000, pp. 6
Online since: January 2014
Authors: Tie Tian, Xing Zi Mao, Lin Mi
Introduction
Magnesium alloys is a structural material with good properties such as low density, high specific strength and high specific stiffness.
And, The main factors that affect the damping test results are the specimen deformation mode (whether conforms with the damping mechanism), the form of constraints of the specimen and the measurement accuracy of the test system.
Based on the above issues, this article gives detailed description on the current damping test principles of magnesium alloys, damping characterization parameters and testing equipment and devices, According to the main factors that affecting the damping test results of magnesium alloys, pointing out the suitability of all testing equipment and schemes for damping test of magnesium alloys and revealing the testing equipment and schemes that apply to the damping mechanism of magnesium alloys and that meet requirements of damping test of magnesium alloys.
At present, loss factor () is adopted for measuring the damping capacity of the tested specimen as calculated by equation (4) [6].
At present, it is mainly used for measuring the relationships between damping and temperature, and damping and strain of the metallic materials. 3.4 Dynamic thermal mechanical analyzer Dynamic thermal mechanical analyzer (DMA) is a measuring instrument with dynamic mechanical property that adopts the principle of subresonance method.
And, The main factors that affect the damping test results are the specimen deformation mode (whether conforms with the damping mechanism), the form of constraints of the specimen and the measurement accuracy of the test system.
Based on the above issues, this article gives detailed description on the current damping test principles of magnesium alloys, damping characterization parameters and testing equipment and devices, According to the main factors that affecting the damping test results of magnesium alloys, pointing out the suitability of all testing equipment and schemes for damping test of magnesium alloys and revealing the testing equipment and schemes that apply to the damping mechanism of magnesium alloys and that meet requirements of damping test of magnesium alloys.
At present, loss factor () is adopted for measuring the damping capacity of the tested specimen as calculated by equation (4) [6].
At present, it is mainly used for measuring the relationships between damping and temperature, and damping and strain of the metallic materials. 3.4 Dynamic thermal mechanical analyzer Dynamic thermal mechanical analyzer (DMA) is a measuring instrument with dynamic mechanical property that adopts the principle of subresonance method.