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Online since: April 2014
Authors: Roberto Montanari, Girolamo Costanza, Stefano Paoloni, Maria Elisa Tata
The fundamental idea is that the higher dislocation density in the deformed zones may induce an anomaly of thermal properties, in particular of the thermal diffusivity D.
The variations of thermal diffusivity induced by progressively higher degrees of plastic deformation may depend in principle on the evolution of several microstructural factors (grain size, grain orientation and dislocation density).
The effects of dislocations on thermal properties of metals have been widely investigated in [10].
Dislocations affect the heat transport properties in two ways: directly, by acting as centres of scattering, and indirectly, by inducing elastic stress fields.
In conclusion thermal diffusivity is affected by the increase of dislocations density therefore locally IRT measurements can detect states of local plasticization in mechanical components.
The variations of thermal diffusivity induced by progressively higher degrees of plastic deformation may depend in principle on the evolution of several microstructural factors (grain size, grain orientation and dislocation density).
The effects of dislocations on thermal properties of metals have been widely investigated in [10].
Dislocations affect the heat transport properties in two ways: directly, by acting as centres of scattering, and indirectly, by inducing elastic stress fields.
In conclusion thermal diffusivity is affected by the increase of dislocations density therefore locally IRT measurements can detect states of local plasticization in mechanical components.
Online since: June 2021
Authors: Li Hong Han, Fang Po Li, Jian Jun Wang, Hui Zhang, Yao Rong Feng, Cai Hong Lu, Shang Yu Yang
With the increase of drilling depth, the mechanical properties of H-section steel used in drilling platform are more and more demanding.
This paper compares and analyzes the microstructure and mechanical properties of different positions on the cross-section of 500 MPa H-section steel rolled by the TMCP process, and provides a technical basis for H-section process optimization.
Fig. 2 Tensile properties of H-section steel different positions.
So when the temperature is lower than a certain value, the instantaneous deformation distribution capacity is the dominant factor affecting the low temperature toughness of the material [11].
Development of a new concept for hot-rolled weathering-DP steel: Thermo-mechanical Simulation, microstructure Adjustment, andMechanical Properties [J].
This paper compares and analyzes the microstructure and mechanical properties of different positions on the cross-section of 500 MPa H-section steel rolled by the TMCP process, and provides a technical basis for H-section process optimization.
Fig. 2 Tensile properties of H-section steel different positions.
So when the temperature is lower than a certain value, the instantaneous deformation distribution capacity is the dominant factor affecting the low temperature toughness of the material [11].
Development of a new concept for hot-rolled weathering-DP steel: Thermo-mechanical Simulation, microstructure Adjustment, andMechanical Properties [J].
Online since: November 2011
Authors: Qiong Wu, Huai Bo Qiang, Mei Ying Xue
The precision of micromanipulator is affected by the characteristic of compliant spring.
The relationships among property of load, displacement, curvature etc and geometrical parameter are analyzed.
The linear range of this mechanism can reach micron level and the resolution can come sub-micron level[1].Compliant spring is the most important part of precision micro-displacements mechanism, it not only can bear a load reliably, but also is the very important factors affecting the performance and reliability of micro-displacements system[2].
Based on above analysis, we can conclude that there is anon-linear relationship among mechanical properties, geometric parameters and loading conditions.
[3] Saxena A, Ananthasuresh K, On a Optimal Property of compliant Topologies, J.
The relationships among property of load, displacement, curvature etc and geometrical parameter are analyzed.
The linear range of this mechanism can reach micron level and the resolution can come sub-micron level[1].Compliant spring is the most important part of precision micro-displacements mechanism, it not only can bear a load reliably, but also is the very important factors affecting the performance and reliability of micro-displacements system[2].
Based on above analysis, we can conclude that there is anon-linear relationship among mechanical properties, geometric parameters and loading conditions.
[3] Saxena A, Ananthasuresh K, On a Optimal Property of compliant Topologies, J.
Online since: January 2022
Authors: Madhusudan Saranathan, S. Tamil Selvi, Pa Hari Krishna Achuthan, R. Abhishek, Adhitya Ravi
Study of Parameters Affecting the Aging of Transformer Oil
S.
Literatures reveal that many research studies have been conducted to analyze the various factors affecting the aging of transformer oil.
Properties of Transformer Oil 2.1 Electrical properties Dielectric strength: Breakdown Voltage is one of the main parameter that affects the dielectric strength of the oil.
Conclusion In this research work, various properties and testing procedures were discussed.
Danikas, Ioannis Liapis, “Factors Affecting the Ageing of Transformer Oil in 150 / 20 kV Transformers”, 2011 IEEE International Conference on Dielectric Liquids.
Literatures reveal that many research studies have been conducted to analyze the various factors affecting the aging of transformer oil.
Properties of Transformer Oil 2.1 Electrical properties Dielectric strength: Breakdown Voltage is one of the main parameter that affects the dielectric strength of the oil.
Conclusion In this research work, various properties and testing procedures were discussed.
Danikas, Ioannis Liapis, “Factors Affecting the Ageing of Transformer Oil in 150 / 20 kV Transformers”, 2011 IEEE International Conference on Dielectric Liquids.
Online since: September 2011
Authors: Ling Xu, Jun Hu, Nu Wen Xu
Fault is one of the most important factors affecting tunnel instability.
Hereby, Weibull distribution is employed to define the material properties, and it can be described as following: where u is the mechanical parameter of the element such as strength and elastic modulus etc.
It can be seen from the properties of the Weibull distribution (Fig. 3), a larger value of m implies a more heterogeneous material and vice versa.
The elements in the specimen must be sufficiently small to reflect the heterogeneous mechanical properties of materials at the meso-scale and still provide conditions under which a current computer can perform the analysis efficiently [10].
Applied with RFPA-SRM, both factors of safety (Fs=1.695 without fault and Fs=1.538 with fault) and the corresponding potential failure regions of the drain tunnel have been obtained.
Hereby, Weibull distribution is employed to define the material properties, and it can be described as following: where u is the mechanical parameter of the element such as strength and elastic modulus etc.
It can be seen from the properties of the Weibull distribution (Fig. 3), a larger value of m implies a more heterogeneous material and vice versa.
The elements in the specimen must be sufficiently small to reflect the heterogeneous mechanical properties of materials at the meso-scale and still provide conditions under which a current computer can perform the analysis efficiently [10].
Applied with RFPA-SRM, both factors of safety (Fs=1.695 without fault and Fs=1.538 with fault) and the corresponding potential failure regions of the drain tunnel have been obtained.
Online since: February 2018
Authors: Xiao Feng Zhang, Yan Yu Ding, Zhi Qiang Fu, Ying Huai Dong, Yan Wang, Bin Lin
This paper study on the influence of ultrasonic vibration assisted grinding (UAG) process on surface topography and properties of C/SiC composites.
The excellent corrosion resistance, high temperature resistance and mechanical properties make CMC widely used in thermal Protection system.
Uhimann [9] found the thermal burns, physical and chemical properties changes of work piece surface could be avoided.
The mechanical properties and microstructure of the C/SiC composite material are evaluated.
It can be directly reflected the influence of the factors on the surface topography.
The excellent corrosion resistance, high temperature resistance and mechanical properties make CMC widely used in thermal Protection system.
Uhimann [9] found the thermal burns, physical and chemical properties changes of work piece surface could be avoided.
The mechanical properties and microstructure of the C/SiC composite material are evaluated.
It can be directly reflected the influence of the factors on the surface topography.
Online since: May 2014
Authors: Dong Mei Zhang, Chun Min Shang, Jian Dong Yang
There are several factors, particularly in the grinding error and the elastic modulus of grinding tool’s material is an important part of them while the grinding tool is made to bending.
Elastic modulus of the material is the inherent properties of it, a material selected as long as the grinding tool should be a constant volume in the bending process of the grinding tool, but the choice of materials as a grinding tool may produce errors which probably affect the accuracy of its bending.
The maximum error at x = 0, then set the parameters as follows: , The large error of elastic modulus will affect the error curve although it seems that the scale factor is very small.
Optical Technology, 1993, (5) :7-13 [4] "Metal mechanical properties" writing group, Metal mechanical properties.
Mechanical Design Manual (Volume 1).
Elastic modulus of the material is the inherent properties of it, a material selected as long as the grinding tool should be a constant volume in the bending process of the grinding tool, but the choice of materials as a grinding tool may produce errors which probably affect the accuracy of its bending.
The maximum error at x = 0, then set the parameters as follows: , The large error of elastic modulus will affect the error curve although it seems that the scale factor is very small.
Optical Technology, 1993, (5) :7-13 [4] "Metal mechanical properties" writing group, Metal mechanical properties.
Mechanical Design Manual (Volume 1).
Online since: October 2007
Authors: Suk Bong Kang, Hyoung Wook Kim, Y.M Jin, Jae Hyung Cho
Microstructure and Mechanical Properties of ZK60 Alloy Sheets
During Aging
J.
Variations in microstructure and mechanical properties of ZK60 alloy sheets were investigated with aging time.
Poor mechanical properties, i.e. limited cold workability and toughness or limited high strength and creep resistance at elevated temperatures, have been the main drawbacks in the extensive usage of Mg alloys.
The frequency of 2β' decreased and T phases were not affected much.
Summary The effect of artificial aging on microstructure and mechanical properties was studied.
Variations in microstructure and mechanical properties of ZK60 alloy sheets were investigated with aging time.
Poor mechanical properties, i.e. limited cold workability and toughness or limited high strength and creep resistance at elevated temperatures, have been the main drawbacks in the extensive usage of Mg alloys.
The frequency of 2β' decreased and T phases were not affected much.
Summary The effect of artificial aging on microstructure and mechanical properties was studied.
Online since: February 2019
Authors: S.A. Sleptsova, N.N. Lazareva, Yu.V. Kapitonova
Effect of Mechanically Activated Layered Silicate on the Properties and Structure of Polytetrafluoroethylene
S.A.
As shown in [4], when choosing the treatment regime for a substance, the main factors are loading conditions (external force, impact speed, contact time), exposure conditions (free or cramped impact, temperature, etc.), properties of the material to be crushed (mechanical and thermal properties).
It should be noted that the low value of thermal expansion is one of the main factors in the development of sealing seals based on PTFE for highly loaded friction units.
Studies of the effects on solid-state properties and reactivity produced by treatment in various mechanical devices in: F.Delogu, G.
Peculiarities of structure and properties conditioned by microphase separation, Pure & Appl.
As shown in [4], when choosing the treatment regime for a substance, the main factors are loading conditions (external force, impact speed, contact time), exposure conditions (free or cramped impact, temperature, etc.), properties of the material to be crushed (mechanical and thermal properties).
It should be noted that the low value of thermal expansion is one of the main factors in the development of sealing seals based on PTFE for highly loaded friction units.
Studies of the effects on solid-state properties and reactivity produced by treatment in various mechanical devices in: F.Delogu, G.
Peculiarities of structure and properties conditioned by microphase separation, Pure & Appl.
Online since: July 2006
Authors: Børge Forbord, Erik Nes, Bjørn Holmedal
The Effect of Boundary Structure on
the Mechanical Properties of Aluminium Alloys
Erik Nes
1, a
, Bjørn Holmedal
1,b and Børge Forbord2,c
1
Norwegian University of Science and Technology (NTNU).
This work reviews the mechanical properties resulting from plastic deformation and annealing of aluminium, looking at alloys which prior to annealing was subjected to both severe plastic deformation (ECAP) and more conventional deformation by cold rolling.
The effect of the resulting microstructures on the subsequent work hardening properties are model, applying the new microstructural metal plasticity model (MMP-model) developed in Trondheim over the last decade.
A new approach to the modelling of the effect of grain size on the mechanical properties of aluminium and aluminium alloys has recently been proposed by Nes et al. [16].
Further, these alloy variants contain a high volume fraction of finely dispersed particles, the effect of which on mechanical properties was neglected in the previous treatments.
This work reviews the mechanical properties resulting from plastic deformation and annealing of aluminium, looking at alloys which prior to annealing was subjected to both severe plastic deformation (ECAP) and more conventional deformation by cold rolling.
The effect of the resulting microstructures on the subsequent work hardening properties are model, applying the new microstructural metal plasticity model (MMP-model) developed in Trondheim over the last decade.
A new approach to the modelling of the effect of grain size on the mechanical properties of aluminium and aluminium alloys has recently been proposed by Nes et al. [16].
Further, these alloy variants contain a high volume fraction of finely dispersed particles, the effect of which on mechanical properties was neglected in the previous treatments.