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Online since: June 2021
Authors: Zhi Shou Zhu, Jing Li, Xin Nan Wang
Room temperature mechanical properties of the used titanium alloy were listed in Table 1.
Table 1 Room temperature mechanical properties of the Ti-Al-Mo-V-Nb-Cr alloy.
Testing performance σb/MPa σp0.2/MPa δ0.5/% ψ/% αku/J·cm-2 KIC/MPa·m1/2 Tensile properties 1432 1390 8.7 27.7 / / Impact properties / / / / 24 / Fracture toughness / / / / / 48 Experimental Results and Discussion True Stress-true Strain Curves.
The deformation temperature and stain rate are crucial factor in flow stress during the hot deformation.
Investigation of dynamic mechanical behavior and damage characteristics in TC32 alloy.
Table 1 Room temperature mechanical properties of the Ti-Al-Mo-V-Nb-Cr alloy.
Testing performance σb/MPa σp0.2/MPa δ0.5/% ψ/% αku/J·cm-2 KIC/MPa·m1/2 Tensile properties 1432 1390 8.7 27.7 / / Impact properties / / / / 24 / Fracture toughness / / / / / 48 Experimental Results and Discussion True Stress-true Strain Curves.
The deformation temperature and stain rate are crucial factor in flow stress during the hot deformation.
Investigation of dynamic mechanical behavior and damage characteristics in TC32 alloy.
Online since: May 2013
Authors: Yi Wang, Nan Zheng, Xiao Xia Chen
Introduction
The cut-out of composite structures may cut off the fiber and cause stress concentration, leading to the reduction of loading capacity of components, affecting the service life and the safe abundance of the structure directly, especially for the composite parts in the aeronautic structure.
The analytical method based on an inclusion analogy for determining the thermal residual stresses in an isotropic plate reinforced with a circular orthotropic patch and the explicit formulae for both the elastic properties and the thermal expansion coefficients of the equivalent inclusion is given[4].
Cutting specimens for mechanical tests out of the textile-reinforced composite plates results in a complex non-uniform reinforcement structure at their edges may affect the strength of specimens[5].
The basic material properties of Quasi-Isotropic Graphite Epoxy were presented in Table 1.
The bulking deformation around the cut-out caused by the eccentric bending moment by the physical dimension asymmetric may be the key factor.
The analytical method based on an inclusion analogy for determining the thermal residual stresses in an isotropic plate reinforced with a circular orthotropic patch and the explicit formulae for both the elastic properties and the thermal expansion coefficients of the equivalent inclusion is given[4].
Cutting specimens for mechanical tests out of the textile-reinforced composite plates results in a complex non-uniform reinforcement structure at their edges may affect the strength of specimens[5].
The basic material properties of Quasi-Isotropic Graphite Epoxy were presented in Table 1.
The bulking deformation around the cut-out caused by the eccentric bending moment by the physical dimension asymmetric may be the key factor.
Online since: July 2019
Authors: Rino R. Mukti, Muhamad Nasir, Muhammad Ali Zulfikar, Ervin Tri Suryandari
Fibers are materials with advantageous properties such as lightweight material properties, has small pore size, and has high surface area, porosity,and permeability.
Results and Discussion In this study will be discussed several factors that affect the fiber produced during the electrospinning process.
These factors are as follows 1.
Applied voltage The amount of the voltage given will affect the morphology and diameter of the fiber produced.
Fiber diameter distribution of PMMA To determine the hydrophobicity of the fiber, the contact angle measurements and spreading time were carried out Contact Angle Fibers was analyzed its properties against water through the measurement of contact angles.
Results and Discussion In this study will be discussed several factors that affect the fiber produced during the electrospinning process.
These factors are as follows 1.
Applied voltage The amount of the voltage given will affect the morphology and diameter of the fiber produced.
Fiber diameter distribution of PMMA To determine the hydrophobicity of the fiber, the contact angle measurements and spreading time were carried out Contact Angle Fibers was analyzed its properties against water through the measurement of contact angles.
Online since: January 2013
Authors: Long Chen, Yan Hui Wu, Shu Huan Wang, Chen Xiao Li, Ding Guo Zhao
With controlling high pressure nitrogen atmosphere and bottom blowing nitrogen, internal react were investigated by single factor experiment.
Introduction High nitrogen steel was a good mechanical properties and corrosion resistance steel, which is the new material of the most value in the metallurgical field in 21th century.
The main influence factors are nitrogen partial pressure, alloy composition and temperature.
Once these factors are determined, then the nitrogen content in steel through calculation known that saturated solubility of nitrogen.
The pressure is the most significant factor in many factors of affecting nitrogen solubility.
Introduction High nitrogen steel was a good mechanical properties and corrosion resistance steel, which is the new material of the most value in the metallurgical field in 21th century.
The main influence factors are nitrogen partial pressure, alloy composition and temperature.
Once these factors are determined, then the nitrogen content in steel through calculation known that saturated solubility of nitrogen.
The pressure is the most significant factor in many factors of affecting nitrogen solubility.
Online since: May 2012
Authors: Yu Pei Zhang, Xiang Dong Shen
By macroscopic mechanical experiments and scanning electron microscope test, experimental results that PAM enhanced the mechanical properties of cement soil ,which the main reasons are as follow:
(1) PAM is a long-chain polymer by the polymerization of acrylamide monomer.
When PAM molecules adsorbed on the particle surface, they will greatly improve the surface properties of these micro-particles and film formed on the surface of the cement particles, which ensure full hydration of the cement.
It is prone chemical reaction for PAM molecules produced carboxylic acid groups and Ca(OH)2 by the hydrolysis to form stable calcium salt of carboxylic acid, reducing the concentration of the transition zone of Ca(OH)2, resulting in poor crystallinity, reducing the crystal orientation of the interfacial transition zone, increasing the bond strength of cementitious materials and aggregates, which is one of the reasons for the improvement the mechanical properties of cement-soil[8]
(a)inter-linkages between the soil particles (b)mutually exclusive between the soil particles Fig.3 Interactions schematic of the cement-soil particle Conclusion (1)PAM plays a dual role that promots hydration of cement and improves the interfacial properties of the cement soil particles ,which makes the overall structure of the cement-soil more dense and effectively improve the strength of the cemented soil
[6] Lin Yunteng: Study on the factors affecting the strength of cement-soil (Fujian Construction Science & Technology , China 2011)
When PAM molecules adsorbed on the particle surface, they will greatly improve the surface properties of these micro-particles and film formed on the surface of the cement particles, which ensure full hydration of the cement.
It is prone chemical reaction for PAM molecules produced carboxylic acid groups and Ca(OH)2 by the hydrolysis to form stable calcium salt of carboxylic acid, reducing the concentration of the transition zone of Ca(OH)2, resulting in poor crystallinity, reducing the crystal orientation of the interfacial transition zone, increasing the bond strength of cementitious materials and aggregates, which is one of the reasons for the improvement the mechanical properties of cement-soil[8]
(a)inter-linkages between the soil particles (b)mutually exclusive between the soil particles Fig.3 Interactions schematic of the cement-soil particle Conclusion (1)PAM plays a dual role that promots hydration of cement and improves the interfacial properties of the cement soil particles ,which makes the overall structure of the cement-soil more dense and effectively improve the strength of the cemented soil
[6] Lin Yunteng: Study on the factors affecting the strength of cement-soil (Fujian Construction Science & Technology , China 2011)
Online since: September 2013
Authors: Yu Lian Cui, Jun Wei Wang, Cheng Ming He
Operational vulnerability appears when the product is subjected to uncontrollable factors in manufacturing and operation processes and mainly results from violation of information axiom, which will lead to lack of operational robustness over the life cycle.
Operational vulnerabilities affecting product quality and reliability are mainly caused by random and uncertain noise factors in the processes of manufacture and operation.
Fig. 2 Analysis process of PoF PoF based reliability assessment approach involves the following activities [3]: (1) Identifying potential failure mechanisms (chemical, electrical, physical, mechanical, structural or thermal processes leading to failure); failure sites; and failure modes
(2) Identifying the appropriate failure models and their input parameters, including those associated with material characteristics, damage properties, relevant geometry at failure sites, manufacturing flaws and defects, and environmental and operating loads
These failure-mechanism models explicitly address the design parameters which have been found to influence reliability strongly, including material properties, defects and electrical, chemical, thermal and mechanical stresses.
Operational vulnerabilities affecting product quality and reliability are mainly caused by random and uncertain noise factors in the processes of manufacture and operation.
Fig. 2 Analysis process of PoF PoF based reliability assessment approach involves the following activities [3]: (1) Identifying potential failure mechanisms (chemical, electrical, physical, mechanical, structural or thermal processes leading to failure); failure sites; and failure modes
(2) Identifying the appropriate failure models and their input parameters, including those associated with material characteristics, damage properties, relevant geometry at failure sites, manufacturing flaws and defects, and environmental and operating loads
These failure-mechanism models explicitly address the design parameters which have been found to influence reliability strongly, including material properties, defects and electrical, chemical, thermal and mechanical stresses.
Online since: September 2013
Authors: Khairul Nizar Ismail, Rafiza Abd Razak, Yahya Zarina, H. Kamarudin, A. Alida, A.M. Mustafa Al Bakri, Omar A. Abdulkareem
Development and Properties of Low-Calcium Fly Ash-based Geopolymer Concrete.
Microstructure and Properties of Chemically Activated Fly Ash Concrete.
Factors Affecting the Immobilization of Metals in Geopolymerised Fly Ash.
The Effect of Alkali Metal Activator on the Properties of the Fly Ash-based Geopolymers.
Factors affecting the performance of metakaolin geopolymers exposed to elevated temperatures.
Microstructure and Properties of Chemically Activated Fly Ash Concrete.
Factors Affecting the Immobilization of Metals in Geopolymerised Fly Ash.
The Effect of Alkali Metal Activator on the Properties of the Fly Ash-based Geopolymers.
Factors affecting the performance of metakaolin geopolymers exposed to elevated temperatures.
Online since: May 2009
Authors: Lei Cui, Jiang Chang, L. Zhao, C. He, Da Ming Zhang
Both scaffolds were
characterized by fiber morphology, pore structure and mechanical properties.
Mechanical Property.
Mechanical Properties.
The mechanical properties of a scaffold are an important design parameter for maintaining stability of the scaffold before the cells can produce their own ECM, which are dominated by (a) (b) (c) (d) intrinsic factors, such as the chemistry of the material, and by extrinsic factors, such as the dimension or architectural arrangement of the scaffold [22].
For the electrospun scaffolds, the mechanical properties are affected by the fiber structure, properties of the materials constituent, and their interactions [32].
Mechanical Property.
Mechanical Properties.
The mechanical properties of a scaffold are an important design parameter for maintaining stability of the scaffold before the cells can produce their own ECM, which are dominated by (a) (b) (c) (d) intrinsic factors, such as the chemistry of the material, and by extrinsic factors, such as the dimension or architectural arrangement of the scaffold [22].
For the electrospun scaffolds, the mechanical properties are affected by the fiber structure, properties of the materials constituent, and their interactions [32].
Online since: October 2014
Authors: Enrico Ciulli, Francesca Di Puccio, Lorenza Mattei, Santina Battaglia, Saverio Affatato
This ceramic exhibited improved mechanical properties and clinical performance [23].
Thanks to these performing properties, new designs, such as bigger implants, could be explored [5].
The mechanical-chemical properties of the four ceramic generations are compared in Table 2.
Table 2 Comparison of the mechanical and physical properties of the four generations of Alumina produced by Ceramtec, data from [20].
Nevertheless this problem seems to be solved with the modern CoC thanks to the significant improvement in the mechanical properties commented above (Table 2).
Thanks to these performing properties, new designs, such as bigger implants, could be explored [5].
The mechanical-chemical properties of the four ceramic generations are compared in Table 2.
Table 2 Comparison of the mechanical and physical properties of the four generations of Alumina produced by Ceramtec, data from [20].
Nevertheless this problem seems to be solved with the modern CoC thanks to the significant improvement in the mechanical properties commented above (Table 2).
Online since: October 2014
Authors: Fang Hong Sun, Tao Zhang, Jian Jin Liu, Bo Song
The uniform temperature flied of substrates is a key factor to deposit high-quality diamond films on milling tools by the hot filament chemical vapor deposition (HFCVD).
Temperature distribution on the substrates is a significant factor in the deposition process, which seriously affects growth rate and surface quality of deposited diamond films [3].
In addition, the material properties used in the simulation are defined in Table 1.
Taking into account the above mentioned factors, the increasing of the rotational speed of worktable is suitable to grow homogeneous diamond films.
Development of ultrananocrystalline diamond (UNCD) coatings for multipurpose mechanical pump seals, J.
Temperature distribution on the substrates is a significant factor in the deposition process, which seriously affects growth rate and surface quality of deposited diamond films [3].
In addition, the material properties used in the simulation are defined in Table 1.
Taking into account the above mentioned factors, the increasing of the rotational speed of worktable is suitable to grow homogeneous diamond films.
Development of ultrananocrystalline diamond (UNCD) coatings for multipurpose mechanical pump seals, J.