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Online since: December 2006
Authors: Fei Hu Zhang, Gui Wen Kang
The results show that the hardness of polishing abrasive is not the
main factors to affect material removal.
According to the properties of the controllable character of MR fluid with the magnetic field intensity, the MR fluid dispersed with appropriate amount of fine abrasives is used as an actuating medium to polish hard and brittle materials such as optical glass.
In addition, the polishing properties and machining path can be controlled in process.
The mechanical effect in MR fluid with cerium oxide as polishing abrasive is relatively weak This highest material removal rate couldn't be simply explained by mechanical effect.
Lin: Chinese Journal of Mechanical Engineering, Vol.15 (2002), pp.175-177
According to the properties of the controllable character of MR fluid with the magnetic field intensity, the MR fluid dispersed with appropriate amount of fine abrasives is used as an actuating medium to polish hard and brittle materials such as optical glass.
In addition, the polishing properties and machining path can be controlled in process.
The mechanical effect in MR fluid with cerium oxide as polishing abrasive is relatively weak This highest material removal rate couldn't be simply explained by mechanical effect.
Lin: Chinese Journal of Mechanical Engineering, Vol.15 (2002), pp.175-177
Online since: October 2013
Authors: Yong Mei
In such cases, by analyzing the rock burst tendency of a particular type of deep mining pit and occurrence of the mining process, rock samples drilled from the coal mine were taken for the conventional mechanical properties test and rock burst tendency test respectively under dry and wet state.
Coal and rock impact characteristic test In order to measure rock mechanical properties, coal and rock samples drilled from two different coal-faces were taken for routine test by using MTS815 rock mechanics test system (Fig.1) and test results are shown in Table1 to Table3. 2#coal seam is a tendency to strong impact; the roof is a moderate impact tendency. 4# coal seam is moderate impact tendency, roof no impact tendency.
Affected by the pressure in the mining and mechanical balance condition suffered disturbance, the accumulated energy is produced from the weak link in the release of impact failure, while operating near the fault the possibility of triggered burst will increase.
On the other hand, through changing physical and mechanical properties as well as structure of coal and rock by high-pressure water fracturing the coal, and promoting hydration to make the coal and rock strength and elastic energy savings ability decline to weaken burst tendency.
Summary (1) Impact strength caused by coal seam roof and floor has a great relationship with the rock properties.
Coal and rock impact characteristic test In order to measure rock mechanical properties, coal and rock samples drilled from two different coal-faces were taken for routine test by using MTS815 rock mechanics test system (Fig.1) and test results are shown in Table1 to Table3. 2#coal seam is a tendency to strong impact; the roof is a moderate impact tendency. 4# coal seam is moderate impact tendency, roof no impact tendency.
Affected by the pressure in the mining and mechanical balance condition suffered disturbance, the accumulated energy is produced from the weak link in the release of impact failure, while operating near the fault the possibility of triggered burst will increase.
On the other hand, through changing physical and mechanical properties as well as structure of coal and rock by high-pressure water fracturing the coal, and promoting hydration to make the coal and rock strength and elastic energy savings ability decline to weaken burst tendency.
Summary (1) Impact strength caused by coal seam roof and floor has a great relationship with the rock properties.
Online since: August 2011
Authors: Takenobu Sakai, Tomohiko Gushiken, Tomoki Masuko, Satoshi Matsushima, Satoshi Kobayashi, Jun Koyanagi, Carlos Rolando Ríos-Soberanis, Satoru Yoneyama
Each individual component maintains its original characteristics while giving the composite distinctive chemical, mechanical and physical properties.
The inherent mechanical properties of the composite depend on the nature of each of the components, their relative quantities and their distribution.
Examination on the correlation between the filler volume fraction and the mechanical properties evaluated by tensile test, stress relaxation test and dynamic mechanical test are discussed.
Mechanical characterization by tensile test Mechanical properties behavior by tensile stress for active carbon-polypropylene composites are presented in fig. 2.
These shift factors are exhibited in fig. 6.
The inherent mechanical properties of the composite depend on the nature of each of the components, their relative quantities and their distribution.
Examination on the correlation between the filler volume fraction and the mechanical properties evaluated by tensile test, stress relaxation test and dynamic mechanical test are discussed.
Mechanical characterization by tensile test Mechanical properties behavior by tensile stress for active carbon-polypropylene composites are presented in fig. 2.
These shift factors are exhibited in fig. 6.
Online since: October 2006
Authors: Jan Luyten, Jan Schrooten, Jos Vander Sloten, Tim Van Cleynenbreugel, Saartje Impens, Astrid Bakker, Frank P. Luyten
Such a screening should be based on the knowledge of mechanical, physical
and (bio)chemical scaffold properties and their interaction with cell behaviour.
The global objective of this project is to gain substantial knowledge about guided bone regeneration, which is defined as the formation of new bone in the presence of artificial structures (inert, biodegradable or biologically activated) that contain bone stimulating factors (osteogenic cells, growth factors, …).
Altering the sintering temperature will influence the final mechanical and structural scaffold properties.
The mechanical properties of the Ti scaffold allow a load bearing application.
As an example a selection of properties is shown in Table 2.
The global objective of this project is to gain substantial knowledge about guided bone regeneration, which is defined as the formation of new bone in the presence of artificial structures (inert, biodegradable or biologically activated) that contain bone stimulating factors (osteogenic cells, growth factors, …).
Altering the sintering temperature will influence the final mechanical and structural scaffold properties.
The mechanical properties of the Ti scaffold allow a load bearing application.
As an example a selection of properties is shown in Table 2.
Online since: March 2018
Authors: Dirk Landgrebe, Roland Müller, Karsten Richter, Franz Reuther
The last two factors are mainly influenced by the machine selection and the knowledge of factors influencing process deviations.
The elastic material behavior has already been named as one of material parameters affecting springback.
The observed mechanical properties are summarized in Fig. 1a.
This data set corresponds quite well with what can be expected due to the mechanical properties.
Different parameters, e.g. materials, orientation of the bending axis compared to the rolling direction and the chosen bending concept proved to be significant impact factors affecting the springback.
The elastic material behavior has already been named as one of material parameters affecting springback.
The observed mechanical properties are summarized in Fig. 1a.
This data set corresponds quite well with what can be expected due to the mechanical properties.
Different parameters, e.g. materials, orientation of the bending axis compared to the rolling direction and the chosen bending concept proved to be significant impact factors affecting the springback.
Online since: January 2011
Authors: Dong Bing Geng, Hong Jun Guo, San Qing Zhang
BMI possess many desirable properties, which make them very attractive for various applications in high-temperature structural composites for aerospace.
These properties include high strength and modulus, excellent chemical radiation and corrosion resistance, good retention of thermo-mechanical properties even after long ageing times at 250°C [4-6].
Yue, Static and Dynamic Mechanical Properties of Modified and Cyanate Ester Interpenetrating Polymer Networks.
Thermal Behavior and Properties of Polymer.
Zhao, Thermal and Morphological Properties of Polyetherimide Modified Bismaleimide Resins.
These properties include high strength and modulus, excellent chemical radiation and corrosion resistance, good retention of thermo-mechanical properties even after long ageing times at 250°C [4-6].
Yue, Static and Dynamic Mechanical Properties of Modified and Cyanate Ester Interpenetrating Polymer Networks.
Thermal Behavior and Properties of Polymer.
Zhao, Thermal and Morphological Properties of Polyetherimide Modified Bismaleimide Resins.
Online since: March 2006
Authors: Jong Woong Kim, Seung Boo Jung
The formation of voids in the solder joints is one of the many critical factors that impacts solder joint
reliability.
Voids may degrade the mechanical robustness of the solder interconnection and, consequently, affect the reliability and conducting performance of the solder joint.
Generally, the location and size of the voids are the key factors that influence the effect of voids on the performance and reliability of solder joints.
This option was combined with Multilinear Isotropic (MISO) hardening model using von Mises plasticity to represent the viscoplastic properties of the solder material.
The size, location, and number of the void affected the strength of solder joints, and especially, the number of void was the most affecting factor that degrades the joint strength.
Voids may degrade the mechanical robustness of the solder interconnection and, consequently, affect the reliability and conducting performance of the solder joint.
Generally, the location and size of the voids are the key factors that influence the effect of voids on the performance and reliability of solder joints.
This option was combined with Multilinear Isotropic (MISO) hardening model using von Mises plasticity to represent the viscoplastic properties of the solder material.
The size, location, and number of the void affected the strength of solder joints, and especially, the number of void was the most affecting factor that degrades the joint strength.
Online since: July 2017
Authors: Tim Foecke, Louise Ahure Powell, Matthias Merzkirch
Numerical models based on cohesive zones are usually used to model and simulate the mechanical behavior of laminated carbon fiber reinforced polymers (CFRP) in automotive and aerospace applications and require different interlaminar properties.
Additionally, the current work offers a detailed insight into the constraints and assumptions to allow exploration of different methods for the determination of material properties using the DIC measured data.
The mechanical interlaminar properties are affected by the volume fraction, the architecture and orientation of the single constituents [1], as well as parameters of the production process.
These models have inputs for different interlaminar properties, including energy, stress and displacement related parameters, to be determined under Mode I, Mode II and mixed Mode loading conditions.
Ye., Consolidation and interlaminar fracture properties of unidirectional commingled CF/PEEK composites, J.
Additionally, the current work offers a detailed insight into the constraints and assumptions to allow exploration of different methods for the determination of material properties using the DIC measured data.
The mechanical interlaminar properties are affected by the volume fraction, the architecture and orientation of the single constituents [1], as well as parameters of the production process.
These models have inputs for different interlaminar properties, including energy, stress and displacement related parameters, to be determined under Mode I, Mode II and mixed Mode loading conditions.
Ye., Consolidation and interlaminar fracture properties of unidirectional commingled CF/PEEK composites, J.
Online since: August 2014
Authors: Yun Qiang Liu, Yong Lv
Originally, Hopper and machine cylinder are ZG310-570, considering cost factors of selection of materials, rolling steel 16MnR is preferred to forgings 16Mn, and impact toughness is almost same at room temperature.
So, the base pressure vessel using 16mm using common 16MnR HSLA steel plate, 16MnR contains manganese relatively low, with good mechanical properties and process performance.
Mechanical properties of 16Mn and ZG310-570 are shown in Table 1.
From Table 1, the mechanical properties of ZG310-570 and 16MnR shows that the levels of 16MnR are high than steel castings on strength and toughness, the hopper and cylinder will not lower strength providing the use of composite panels 6MnR and 1Cr18Ni9.
Table1 Mechanical properties of 16Mn and ZG310-570 properties of material ZG310-570 16MnR 1Cr18Ni9 yield strength [MPa] 310 345 210 tensile strength [MPa] 570 510~655 530 elongation [%] 15 21 40 impact energy [J] 15 27 — hardness [HV] ≥900 (hard chromium plating after nitride coating) — ≤200 Because the hopper walls contacts with materials (such as rubber, fodder, etc.), feeding materials are easy to be worn, so the hopper walls should be clean and not rusty, steel castings requires hard chrome plated.
So, the base pressure vessel using 16mm using common 16MnR HSLA steel plate, 16MnR contains manganese relatively low, with good mechanical properties and process performance.
Mechanical properties of 16Mn and ZG310-570 are shown in Table 1.
From Table 1, the mechanical properties of ZG310-570 and 16MnR shows that the levels of 16MnR are high than steel castings on strength and toughness, the hopper and cylinder will not lower strength providing the use of composite panels 6MnR and 1Cr18Ni9.
Table1 Mechanical properties of 16Mn and ZG310-570 properties of material ZG310-570 16MnR 1Cr18Ni9 yield strength [MPa] 310 345 210 tensile strength [MPa] 570 510~655 530 elongation [%] 15 21 40 impact energy [J] 15 27 — hardness [HV] ≥900 (hard chromium plating after nitride coating) — ≤200 Because the hopper walls contacts with materials (such as rubber, fodder, etc.), feeding materials are easy to be worn, so the hopper walls should be clean and not rusty, steel castings requires hard chrome plated.
Online since: January 2005
Authors: Hong Song Fan, Xing Dong Zhang, Xin Long Wang
Over
last decade, intensive studies to the improvement in sintering property of β-TCP have been
conducted over the world.
In addition, Ca/P ratio affected the transition temperature.
Hysun-Seung Ryu [5] also confirmed the Ca2P2O2 affected the sintering property of β-TCP, but much Ca2P2O2 have been observed in the final products.
Based on these factors, our work is to investigate the effect of Ca2P2O2 and CaCO3 addition on the phase transition and sintering behavior of β-TCP in order to improve the compressive strength and reduce impurity of porous TCP ceramics. 2.
The better mechanical strength was desirable for the clinical application of TCP as bone repair materials.
In addition, Ca/P ratio affected the transition temperature.
Hysun-Seung Ryu [5] also confirmed the Ca2P2O2 affected the sintering property of β-TCP, but much Ca2P2O2 have been observed in the final products.
Based on these factors, our work is to investigate the effect of Ca2P2O2 and CaCO3 addition on the phase transition and sintering behavior of β-TCP in order to improve the compressive strength and reduce impurity of porous TCP ceramics. 2.
The better mechanical strength was desirable for the clinical application of TCP as bone repair materials.