Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: November 2012
Authors: Xing Bo Shi, Ju Lin Wang, Xiao Ping Cai
The shear rate sensitive factors of samples were calculated, A-0=0.366, A-5=0.341, A-15=0.266, B-0=0.414, B-5=0.350, B-15=0.297.
Mechanical properties of composition The mechanical properties obtained are summarized in Table 4.
However, the component with molecule weight of 10,000~150,000 has little influence on mechanical properties.
In general, reducing peak value of LWM component is beneficial to physical properties, and improving peak value of LWM component has little influence on mechanical properties.
Whereas, it is worth to further study how h and L affect physical properties of composites.
Mechanical properties of composition The mechanical properties obtained are summarized in Table 4.
However, the component with molecule weight of 10,000~150,000 has little influence on mechanical properties.
In general, reducing peak value of LWM component is beneficial to physical properties, and improving peak value of LWM component has little influence on mechanical properties.
Whereas, it is worth to further study how h and L affect physical properties of composites.
Online since: January 2012
Authors: Zhan Guang Wang, Wei Han Yang, Ping Cai, Jing Zhi Hu
Based on compression tests of closed-cell Al alloy foam measured, mchanical properties and energy absorption capability had been investigated.
Properties of uniaxial compression, energy absorption capability and energy absorption efficiency have been studied.
Properties of energy absorption Properties of energy absorption are characterized by energy absorption capacity W [2]
It has good compressive properties because of the feature of its structure.
The densification starting point and fracture morphology are important factor to affect energy absorption.
Properties of uniaxial compression, energy absorption capability and energy absorption efficiency have been studied.
Properties of energy absorption Properties of energy absorption are characterized by energy absorption capacity W [2]
It has good compressive properties because of the feature of its structure.
The densification starting point and fracture morphology are important factor to affect energy absorption.
Online since: January 2012
Authors: Guo Wei Gao, Juan Wang, Li Li Liu, Xi Lin Li, Wei Cao Chen
The random noise is an important factor that affects the precision of the MEMS gyroscope.
Besides, given the complexity of the actual system, the statistical properties of the system interference noise and observation noise are difficult to access.
Because of the time variability and random properties of the actual situation, the statistical properties of the noise are unknown and time-varying.
Where:,is the forgotten factor with the generally range 0.95 to 0.99.
To simplify the computation without affecting the drift coefficient estimation accuracy, we can assume that r=0, q=0.As the measurement noise variance matrix R have the most obvious impact on the filter.
Besides, given the complexity of the actual system, the statistical properties of the system interference noise and observation noise are difficult to access.
Because of the time variability and random properties of the actual situation, the statistical properties of the noise are unknown and time-varying.
Where:,is the forgotten factor with the generally range 0.95 to 0.99.
To simplify the computation without affecting the drift coefficient estimation accuracy, we can assume that r=0, q=0.As the measurement noise variance matrix R have the most obvious impact on the filter.
Online since: June 2013
Authors: Li Gang Zhang, Hong Zhu, Xiang Dong Qi
Elastic Properties of Rhombus Dodecahedron
Open-Cell Cellular Materials
Hong Zhu1, a, Ligang Zhang2, b, Xiangdong Qi2, c
1School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
2National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China
azhuhong9@126.com, bzlg@ysu.edu.cn, cxdqi@ysu.edu.cn
Keywords: Cellular materials; Rhombus dodecahedron; Elastic properties; Finite element method
Abstract.
Geometric Model Rheological state and surface tension of melt body are two important factors of cellular materials formation, surface tension draws the solid to cell-corner.
(4) Summary For the solid which surface tension draws to cell-corner has influence on relative density increment, circle-strut radius and transitional-junction curvature radius are all the primary factors.
Ashby: Cellular Solids: Structure and Properties (Tsinghua University Press, Beijing 2003)
Lu: Journal of Mechanical Strength.
Geometric Model Rheological state and surface tension of melt body are two important factors of cellular materials formation, surface tension draws the solid to cell-corner.
(4) Summary For the solid which surface tension draws to cell-corner has influence on relative density increment, circle-strut radius and transitional-junction curvature radius are all the primary factors.
Ashby: Cellular Solids: Structure and Properties (Tsinghua University Press, Beijing 2003)
Lu: Journal of Mechanical Strength.
Online since: November 2016
Authors: Olaf Engler, Ole Runar Myhr
Natural ageing during these pause times is known to greatly affect materials properties of autobody sheet.
Forming of a metal sheet is often impeded by anisotropic materials behaviour, such as in-plane anisotropy in mechanical properties and especially the existence of pronounced plastic strain ratios or ‘r-values’.
Mechanical Tests.
Simulation of Materials Properties Simulation of In-plane Anisotropy.
As expected, prolonged natural ageing prior to tensile testing gave rise to a significant increase in T4 strength, whereas the T6 properties were affected much less (Fig. 2(a)).
Forming of a metal sheet is often impeded by anisotropic materials behaviour, such as in-plane anisotropy in mechanical properties and especially the existence of pronounced plastic strain ratios or ‘r-values’.
Mechanical Tests.
Simulation of Materials Properties Simulation of In-plane Anisotropy.
As expected, prolonged natural ageing prior to tensile testing gave rise to a significant increase in T4 strength, whereas the T6 properties were affected much less (Fig. 2(a)).
Online since: May 2014
Authors: Silvio Genna, Antonello Astarita, Fabrizio Memola Capece Minutolo, Valentino Paradiso, Antonino Squillace, Claudio Leone
Both the chemical composition and the main mechanical properties of this alloy are fully available in literature [21] and are not reported here for the sake of brevity.
The control factors were selected accordingly to the above mentioned considerations.
Table 2 summarizes the levels of control factors and their settings.
However, it is affected by all the control factors, furthermore, its value mainly depends on the changes of down kerf
Squillace, Effect of welding parameters on mechanical and microstructural properties of dissimilar AA6082-AA2024 joints produced by friction stir welding, Materials and Design, V. 30/3 (2009), 609-616
The control factors were selected accordingly to the above mentioned considerations.
Table 2 summarizes the levels of control factors and their settings.
However, it is affected by all the control factors, furthermore, its value mainly depends on the changes of down kerf
Squillace, Effect of welding parameters on mechanical and microstructural properties of dissimilar AA6082-AA2024 joints produced by friction stir welding, Materials and Design, V. 30/3 (2009), 609-616
Online since: October 2010
Authors: Guang Sheng Zhang, Hui Min Fang
Three main factors are cracking, wrinkling and
springback during the process of the sheet metal stamping forming.
Experimental Study There are many factors of the affecting springback, such as material properties, thickness of sheet metal, the condition of friction, the geometric parameter of mold and the parameters of technology during the processing, they have different degrees effects on springback.
Material Properties.
Table 3 Material properties Material Poisson ratio Elasticity modulus(MPa) Yield strength(MPa) Hardelling index Density(ton/mm 3) 6111 0.33 2.07×105 183 0.265 7.85×10-9 The Model of FEM.
Before applying the load, the parameters in table 3 are added to the table of material properties.
Experimental Study There are many factors of the affecting springback, such as material properties, thickness of sheet metal, the condition of friction, the geometric parameter of mold and the parameters of technology during the processing, they have different degrees effects on springback.
Material Properties.
Table 3 Material properties Material Poisson ratio Elasticity modulus(MPa) Yield strength(MPa) Hardelling index Density(ton/mm 3) 6111 0.33 2.07×105 183 0.265 7.85×10-9 The Model of FEM.
Before applying the load, the parameters in table 3 are added to the table of material properties.
Online since: May 2013
Authors: Yao Qiong Xue, Xu Peng Jiao, Nian Qin Wang, Xiao Ling Liu
Paleosol is an important factor affecting the stability of loess slope, and its mechanical properties, deformation and failure mechanism are still under in-depth exploration and research.
Introduction Loess slope with complex structure, old and new loess have varies engineering properties.
Quantitative Analysis on stress relaxation phenomenon of Malan loess by using factors of stress relaxation(I=(σmax-σmin)/σmax).
Seismic damage assessment and seismic subsidence of loess with Different properties.
[7] GB/T50269-97,Code for Measurement Method of Dynamic Properties of Subsoil[S].in Chinese
Introduction Loess slope with complex structure, old and new loess have varies engineering properties.
Quantitative Analysis on stress relaxation phenomenon of Malan loess by using factors of stress relaxation(I=(σmax-σmin)/σmax).
Seismic damage assessment and seismic subsidence of loess with Different properties.
[7] GB/T50269-97,Code for Measurement Method of Dynamic Properties of Subsoil[S].in Chinese
Online since: October 2014
Authors: Daniela Mariana Barbu
The effect of vibration on the human body is related to the natural frequency of parts of the human body affected.
The results of these reports indicated the resonance of the human body depended on various factors: the posture, the materials of the given seat surface, vibration magnitude and frequency.
Although the human body is a unified and complex active dynamic system, lumped parameter models are often used to capture and evaluate human dynamic properties.
The masses are connected together in the vertical direction by mass less springs and dampers that capture human viscoelastic properties.
Most affected parts ale the organism are head (the neurological systems) and the thorax (the breathing).
The results of these reports indicated the resonance of the human body depended on various factors: the posture, the materials of the given seat surface, vibration magnitude and frequency.
Although the human body is a unified and complex active dynamic system, lumped parameter models are often used to capture and evaluate human dynamic properties.
The masses are connected together in the vertical direction by mass less springs and dampers that capture human viscoelastic properties.
Most affected parts ale the organism are head (the neurological systems) and the thorax (the breathing).
Online since: May 2011
Authors: Ji Hui Wang, Hua Bo Huang, Hong Yan Chen
Effects of Carbon Nanotube Functionalization on the Mechanical Properties of Vinyl Ester Composites
Hongyan Chena, Huabo Huangb and Jihui Wang*c
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, China
achyrain_2000@163.com, bhuanghuabo2008@126.com, cjhwang@whut.edu.cn
Keywords: Carbon nanotubes; Vinyl ester resin; Functionalization; Nanocomposites
Abstract.
Introduction Because of the unique structural, mechanical, and electrical properties, since their discovery [1] carbon nanotubes (CNTs) have generated great scientific and technical interests.
Carbon nanotubes in general are regarded as high potential fillers to improve polymers properties.
The major factors affecting the reinforcing efficiency of CNTs are strong interfacial bonding between the CNTs and polymer and appropriate dispersion of CNTs in polymer matrix due to their large specific surface areas (SSA) and inert surface.
We demonstrate that the existence of GMA on MWCNTs can improve the MWCNTs–vinyl ester resin interfacial interaction and thus effectively enhance the mechanical properties of MWCNTs/vinyl ester resin composites.
Introduction Because of the unique structural, mechanical, and electrical properties, since their discovery [1] carbon nanotubes (CNTs) have generated great scientific and technical interests.
Carbon nanotubes in general are regarded as high potential fillers to improve polymers properties.
The major factors affecting the reinforcing efficiency of CNTs are strong interfacial bonding between the CNTs and polymer and appropriate dispersion of CNTs in polymer matrix due to their large specific surface areas (SSA) and inert surface.
We demonstrate that the existence of GMA on MWCNTs can improve the MWCNTs–vinyl ester resin interfacial interaction and thus effectively enhance the mechanical properties of MWCNTs/vinyl ester resin composites.