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Online since: March 2006
Authors: Byeong Choon Goo, Sung Yong Yang, Dong Hyung Lee
We surveyed literature and proposed a procedure to identify the fatigue properties from
the Brinell hardness and Young's modulus.
Fatigue lifetime prediction of welded joints Relations between mechanical and fatigue properties.
[HB.()N()HB.( E − − +− −+ + + = ε∆σ (5) FE model and fatigue notch factors.
The obtained stress concentration factors, tK , by FE analysis and fatigue notch factors, fK , by Peterson's formula [4,5] are shown in Table 1.
Calculated stress concentration factors and fatigue notch factors Specimens Butt-weld TN NCN CN tK / fK 1.60/1.52 2.71/1.63 3.64/1.93 4.22/2.40 FE analyses of residual stress and residual stress relaxation.
Fatigue lifetime prediction of welded joints Relations between mechanical and fatigue properties.
[HB.()N()HB.( E − − +− −+ + + = ε∆σ (5) FE model and fatigue notch factors.
The obtained stress concentration factors, tK , by FE analysis and fatigue notch factors, fK , by Peterson's formula [4,5] are shown in Table 1.
Calculated stress concentration factors and fatigue notch factors Specimens Butt-weld TN NCN CN tK / fK 1.60/1.52 2.71/1.63 3.64/1.93 4.22/2.40 FE analyses of residual stress and residual stress relaxation.
Online since: January 2022
Authors: Zainal Arifin Ahmad, Abdul Rashid Jamaludin, Nik Akmar Rejab, Norazharuddin Shah Abdullah
These voids contain sharp corners of its triangular shape struts, and are known to initiate strut failures, which eventually affected the structure mechanical properties [11].
Mechanical Properties The compressive strength of the foams is shown in Fig. 3.
Medalist, The mechanical properties of cellular solids, Metall.
Kuo, Mechanical properties of Al2O3/ZrO2 composites, J.
Hakim, Structural and Mechanical Properties of Zirconia Toughened Alumina (ZTA) Composites, Int.
Mechanical Properties The compressive strength of the foams is shown in Fig. 3.
Medalist, The mechanical properties of cellular solids, Metall.
Kuo, Mechanical properties of Al2O3/ZrO2 composites, J.
Hakim, Structural and Mechanical Properties of Zirconia Toughened Alumina (ZTA) Composites, Int.
Online since: April 2012
Authors: Il Ho Kim
The thermoelectric properties were improved due to the low thermal conductivity as a result of In filling and the optimum carrier concentration caused by Ni doping.
On the other hand, the substitution of dopants for Co or Sb can affect the electronic structure and electrical properties and cause a substantial change in the carrier mass.
Anno et al. [18] reported that Ni had a strong influence on the electronic properties of CoSb3 due to electron-phonon interactions.
In this study, In-filled and Ni-doped CoSb3 skutterudites were prepared, and the effects of filling and doping on the thermoelectric properties were examined.
In0.25Co4-xNixSb12 skutterudites have power factors ranging from 1.5´10-3 to 3.9´10-3 W/mK2 at all temperatures examined.
On the other hand, the substitution of dopants for Co or Sb can affect the electronic structure and electrical properties and cause a substantial change in the carrier mass.
Anno et al. [18] reported that Ni had a strong influence on the electronic properties of CoSb3 due to electron-phonon interactions.
In this study, In-filled and Ni-doped CoSb3 skutterudites were prepared, and the effects of filling and doping on the thermoelectric properties were examined.
In0.25Co4-xNixSb12 skutterudites have power factors ranging from 1.5´10-3 to 3.9´10-3 W/mK2 at all temperatures examined.
Online since: May 2011
Authors: Ying Li, Ai Jun Guo
Key words: Leachate; Garbage; Output
Abstract: The influencing factors of landfill leachate are analyzed.
垃圾渗滤液产生量的影响因素The amount of leachate generated factors 影响垃圾渗滤液产生的因素很多,归纳起来,主要有以下几方面:区域降水及气候状况、垃圾性质与成分、填埋场水文地质条件、填埋场作业区大小、垃圾覆盖层状况等。
The main factors of rainfall is surface runoff and infiltration, rainfall intensity, rainfall duration, landfill cover conditions.
The water storage of garbage during its landfill process depends on the waste composition, landfill space temperature, the depth of the landfill, compacted layer level and coverage of closed properties.
Factors that affect evaporation and transpiration is mainly radiation, temperature and humidity, wind and other weather conditions, followed by vegetation and soil and waste water the size and distribution.
垃圾渗滤液产生量的影响因素The amount of leachate generated factors 影响垃圾渗滤液产生的因素很多,归纳起来,主要有以下几方面:区域降水及气候状况、垃圾性质与成分、填埋场水文地质条件、填埋场作业区大小、垃圾覆盖层状况等。
The main factors of rainfall is surface runoff and infiltration, rainfall intensity, rainfall duration, landfill cover conditions.
The water storage of garbage during its landfill process depends on the waste composition, landfill space temperature, the depth of the landfill, compacted layer level and coverage of closed properties.
Factors that affect evaporation and transpiration is mainly radiation, temperature and humidity, wind and other weather conditions, followed by vegetation and soil and waste water the size and distribution.
Online since: September 2017
Authors: Tadeusz Zaborowski, Tibor Krenický, Anton Panda, Ľudmila Nováková-Marcinčinová, Ema Nováková-Marcinčinová
The article describes selected and carried out tests of mechanical properties of PLA plastics extruded in different directions in this case carried out vertically by FDM rapid prototyping method of two PLA materials such as pure without additives blended with blue dye.
In order to transform the starch material properties corresponding to plastic from petroleum, it must be exposed to high temperatures and by isolation we get glucose from it.
Fig. 2 Production of samples vertically in the Repetier-Host software Experimental Test for Determining the Tensile Properties Experimental test of the tensile properties of PLA plastic test samples was carried out in accordance with the standard EN ISO 527 on testing machine Tira-test 2300 in the laboratory of mechanical and technological tests.
Pandová, Progressive technology diagnostic and factors affecting to machinability, Applied Mechanics and Materials 616 (2014) 183-190
Spišák, Assessment of properties thermal sprayed coatings realised using cermet blend powder, Metalurgija 53/4 (2014) 661-664
In order to transform the starch material properties corresponding to plastic from petroleum, it must be exposed to high temperatures and by isolation we get glucose from it.
Fig. 2 Production of samples vertically in the Repetier-Host software Experimental Test for Determining the Tensile Properties Experimental test of the tensile properties of PLA plastic test samples was carried out in accordance with the standard EN ISO 527 on testing machine Tira-test 2300 in the laboratory of mechanical and technological tests.
Pandová, Progressive technology diagnostic and factors affecting to machinability, Applied Mechanics and Materials 616 (2014) 183-190
Spišák, Assessment of properties thermal sprayed coatings realised using cermet blend powder, Metalurgija 53/4 (2014) 661-664
Online since: September 2013
Authors: Wen Min Song, Hui Xia Guo, Jun Chen Li, Gui Rong Yang, Ying Ma, Jie Sheng, Yuan Hao, Yu Fu Zhang
Macroscopic mechanical response is one of the key factors in designing pressure vessel.
It introduces a pressure vessel from geometric model building, the definition of the material properties and the finite element mesh division in self-respect, hydraulic, internal pressure load respectively under the action of macro mechanics response of numerical calculation.
The concrete material properties are listed in Tab.2.
In addition, the different part of the pressure vessel material, according to the material parameters list, defines corresponding material properties.
Calculation of pressure vessel under hydraulic load the mechanical response The mechanical response under the action of hydraulic should be simplified.
It introduces a pressure vessel from geometric model building, the definition of the material properties and the finite element mesh division in self-respect, hydraulic, internal pressure load respectively under the action of macro mechanics response of numerical calculation.
The concrete material properties are listed in Tab.2.
In addition, the different part of the pressure vessel material, according to the material parameters list, defines corresponding material properties.
Calculation of pressure vessel under hydraulic load the mechanical response The mechanical response under the action of hydraulic should be simplified.
Online since: October 2015
Authors: Azeanita Suratkon, Chee Ming Chan, Suaathi Kaliannan
Malaysia is moving towards the sustainability approach and one of the key factors to achieve it is to reduce waste.
Most existing guidelines only highlights on the treatment process of contaminants which affects human health and environment.
Mechanical stabilisation is altering the physical nature of native soil by either vibration or compaction or by incorporating other physical properties such as barriers and nailing.
Thus, from the findings, these 3 main factors that causes problem had been identified which are transportation, storage, and treatment.
These are the factors which will lead to problems along the process of creating artificial land.
Most existing guidelines only highlights on the treatment process of contaminants which affects human health and environment.
Mechanical stabilisation is altering the physical nature of native soil by either vibration or compaction or by incorporating other physical properties such as barriers and nailing.
Thus, from the findings, these 3 main factors that causes problem had been identified which are transportation, storage, and treatment.
These are the factors which will lead to problems along the process of creating artificial land.
Online since: February 2018
Authors: P.K. Mandal
The cast Al-Zn-Mg 7000 alloy has become one of the most potential structural materials in many engineering fields such as aircraft body, automotive casting due to their high strength to weight ratio, strong age hardening ability, competitive weight savings, attractive mechanical properties and improvement of thermal properties.
This process can be used to locally refine microstructures and eliminate casting defects in selected locations, where mechanical properties improvements can enhance component performance and service life.
FSP is a local thermo-mechanical metal working process that changes the local properties without influencing properties in the remainder of the structure.
Grain refinement is an effective means to improve the mechanical properties, e.g. yield strength, fracture toughness and fatigue.
In addition, the knowledge of the fracture properties of Al-Zn-Mg alloys (7000 series) is an important factor for industrial application under failure-safe design.
This process can be used to locally refine microstructures and eliminate casting defects in selected locations, where mechanical properties improvements can enhance component performance and service life.
FSP is a local thermo-mechanical metal working process that changes the local properties without influencing properties in the remainder of the structure.
Grain refinement is an effective means to improve the mechanical properties, e.g. yield strength, fracture toughness and fatigue.
In addition, the knowledge of the fracture properties of Al-Zn-Mg alloys (7000 series) is an important factor for industrial application under failure-safe design.
Online since: January 2006
Authors: Tung Chuan Wu, Min Chie Chou, S.C. Shen, P.J. Cheng, R.Y. Wang, M.F. Chen, C.T. Pan
Introduction
The resolution of traditional molds fabricated by mechanical manufacture is limited.
Light source of lithography affects the aspect ratio and collimation of the structure.
The plating concentration and content of electroplating affect physical and mechanical properties of the molds.
The Ni/Co alloy molds have the properties of extra-high hardness and low residual stress.
Thus, Ni/Co alloy electroplating process is a key factor to manufacturing metal micro-punch molds.
Light source of lithography affects the aspect ratio and collimation of the structure.
The plating concentration and content of electroplating affect physical and mechanical properties of the molds.
The Ni/Co alloy molds have the properties of extra-high hardness and low residual stress.
Thus, Ni/Co alloy electroplating process is a key factor to manufacturing metal micro-punch molds.
Online since: March 2004
Authors: Zhen Hai Long, Zhu Bo Liu, X.B. Wang
In a milling process, periodic thermal and mechanical stresses are the two effective factors that
play significant role in affecting the tool life, failure mode and wear mechanism.
In most case, these factors cause microcracks, chipping and sometimes catastrophic failure of the entire cutting edge [4].
Table 1 Physical and chemical properties of an ultra high strength alloy steel Chemical properties [wt%] Physical properties C Mn Si P S Ni Cr Mo � b [Mpa] � s [Mpa] � [%] � [%] 0.26̚ 0.32 0.30 ̚ 0.50 0.16 ̚ 0.35 �0.015 � 0.010 2.8 ̚ 3.2 0.6 ̚ 1.0 0.4 ̚ 0.5 1380 1220 17 53 � s: Yield strength; � b: Shear strength; � : Eongation ratio; � : Area reduction Experiment Procedure and Operating Parameters.
The combined action of the structure strength reduction and stress concentration will in turn lead to mechanical crack initiation.
The results indicate that the cutting force and surface roughness are 440 Title of Publication (to be inserted by the publisher) affected mainly by the feed per tooth and the depth of cut.
In most case, these factors cause microcracks, chipping and sometimes catastrophic failure of the entire cutting edge [4].
Table 1 Physical and chemical properties of an ultra high strength alloy steel Chemical properties [wt%] Physical properties C Mn Si P S Ni Cr Mo � b [Mpa] � s [Mpa] � [%] � [%] 0.26̚ 0.32 0.30 ̚ 0.50 0.16 ̚ 0.35 �0.015 � 0.010 2.8 ̚ 3.2 0.6 ̚ 1.0 0.4 ̚ 0.5 1380 1220 17 53 � s: Yield strength; � b: Shear strength; � : Eongation ratio; � : Area reduction Experiment Procedure and Operating Parameters.
The combined action of the structure strength reduction and stress concentration will in turn lead to mechanical crack initiation.
The results indicate that the cutting force and surface roughness are 440 Title of Publication (to be inserted by the publisher) affected mainly by the feed per tooth and the depth of cut.