This report describes the improvements in the joint properties of friction welded joint of 780MPa class high tensile steel. Welded joint made by a continuous drive friction welding machine, the conventional method, had not obtained 100% joint efficiency despite applying forge pressure. This was due to the softening of the welded interface zone for heat input during braking times. Therefore, we developed a continuous drive friction welding machine with an electromagnetic clutch to prevent heat input during braking time. We proposed the process as “The Low Heat Input Friction Welding Method (the LHI method).” In this case, the joint had the same tensile strength as the base metal at friction time when the friction torque reached the initial peak torque. That is, the welded joint obtained 100% joint efficiency by using only the friction stage up to the initial peak torque without the forge (upsetting) stage, despite the existence of a slightly softened region adjacent to the welded interface. Furthermore, the softened region was hardly generated when this joint was made by applying forge pressure at the initial peak torque. In conclusion, a welded joint of high tensile steel made by only the friction stage of the LHI method had excellent joint properties. The LHI method has a lot of advantages for joining such materials as super fine grain steel with which conventional fusion welding processes have difficulty.
{"title":"Improving Joint Properties of Friction Welded Joint of High Tensile Steel","authors":"M. Kimura, M. Kusaka, K. Seo, A. Fuji","doi":"10.1299/JSMEA.48.399","DOIUrl":"https://doi.org/10.1299/JSMEA.48.399","url":null,"abstract":"This report describes the improvements in the joint properties of friction welded joint of 780MPa class high tensile steel. Welded joint made by a continuous drive friction welding machine, the conventional method, had not obtained 100% joint efficiency despite applying forge pressure. This was due to the softening of the welded interface zone for heat input during braking times. Therefore, we developed a continuous drive friction welding machine with an electromagnetic clutch to prevent heat input during braking time. We proposed the process as “The Low Heat Input Friction Welding Method (the LHI method).” In this case, the joint had the same tensile strength as the base metal at friction time when the friction torque reached the initial peak torque. That is, the welded joint obtained 100% joint efficiency by using only the friction stage up to the initial peak torque without the forge (upsetting) stage, despite the existence of a slightly softened region adjacent to the welded interface. Furthermore, the softened region was hardly generated when this joint was made by applying forge pressure at the initial peak torque. In conclusion, a welded joint of high tensile steel made by only the friction stage of the LHI method had excellent joint properties. The LHI method has a lot of advantages for joining such materials as super fine grain steel with which conventional fusion welding processes have difficulty.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129163812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The general method of reducing curving or bending for midsize wires or sheets is straightening using rollers and / or levelers. For superfine wires, similarly, high straightness is needed. However, it is very di ffi cult to deal with superfine wires due to their fineness and low tensile strength. In our study, warm tensile straightening processes for superfine gold wire, which is widely used as bonding material between leads and IC chips in semiconductors, were examined. Furthermore, finite element analyses of drawing and tensile straightening of superfine wires were carried out. The correlation between straightness and axial residual stress, which was calculated using the curve width when half of the wire was removed by sputtering with a focused ion beam (FIB), was studied. As a result of our studies, the improvement of straightness by tensile straightening of superfine gold wire was demonstrated, and the relationship between axial residual stress and straightness of wires was clarified.
{"title":"Tensile Straightening of Superfine Wire and Residual Stress Measurement Using Focused Ion Beam","authors":"Tsutomu Yamashita, Kazunari Yoshida","doi":"10.1299/JSMEA.48.322","DOIUrl":"https://doi.org/10.1299/JSMEA.48.322","url":null,"abstract":"The general method of reducing curving or bending for midsize wires or sheets is straightening using rollers and / or levelers. For superfine wires, similarly, high straightness is needed. However, it is very di ffi cult to deal with superfine wires due to their fineness and low tensile strength. In our study, warm tensile straightening processes for superfine gold wire, which is widely used as bonding material between leads and IC chips in semiconductors, were examined. Furthermore, finite element analyses of drawing and tensile straightening of superfine wires were carried out. The correlation between straightness and axial residual stress, which was calculated using the curve width when half of the wire was removed by sputtering with a focused ion beam (FIB), was studied. As a result of our studies, the improvement of straightness by tensile straightening of superfine gold wire was demonstrated, and the relationship between axial residual stress and straightness of wires was clarified.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130326069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mechanical alloying (MA) of Ti-48mol%Al powder mixtures was performed for relatively short milling times (10.8-86.4ks) by planetary ball mill. The MA powders were hot-pressed at relatively low temperatures (673-873K) and pressures (200-600MPa). The influence of hot press temperature and pressure on consolidation (densification, reactive synthesis, etc.) in the MA powders was investigated. In this experiment, some non-reactive Ti powders remained in the consolidated materials, but the optimum hot press conditions for consolidation by reactive sintering were determined by the MA conditions (milling duration, etc.). Subsequently, the hot-pressed specimens were tested for hot-working by compressive creep testing at 1273K and initial pressure of 50MPa. The hot workability was excellent for superplasticity-like deformation. The densification and alloying did not alter the ultra-fine grain size, and the highest density and greatest change in density by hot-working was obtained by the powders milled for longest time.
{"title":"Consolidation at Low Heat in Mechanically Alloyed Ti-Al Powders","authors":"T. Okabe, T. Kanameda","doi":"10.1299/JSMEA.48.364","DOIUrl":"https://doi.org/10.1299/JSMEA.48.364","url":null,"abstract":"Mechanical alloying (MA) of Ti-48mol%Al powder mixtures was performed for relatively short milling times (10.8-86.4ks) by planetary ball mill. The MA powders were hot-pressed at relatively low temperatures (673-873K) and pressures (200-600MPa). The influence of hot press temperature and pressure on consolidation (densification, reactive synthesis, etc.) in the MA powders was investigated. In this experiment, some non-reactive Ti powders remained in the consolidated materials, but the optimum hot press conditions for consolidation by reactive sintering were determined by the MA conditions (milling duration, etc.). Subsequently, the hot-pressed specimens were tested for hot-working by compressive creep testing at 1273K and initial pressure of 50MPa. The hot workability was excellent for superplasticity-like deformation. The densification and alloying did not alter the ultra-fine grain size, and the highest density and greatest change in density by hot-working was obtained by the powders milled for longest time.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126141512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Futakawa, T. Naoe, H. Kogawa, H. Date, Y. Ikeda
High-power spallation targets for neutron sources are being developed in the world. Mercury target will be installed at the material science and life facility in J-PARC, which will promote innovative science. The mercury target will be subjected to the pressure wave caused by proton bombarding in the mercury. The pressure wave propagation induces the cavitation in mercury that imposes localized impact damage on the target vessel. The impact erosion is a critical issue to decide the lifetime of target. An electromagnetic impact testing machine, MIMTM, was developed to reproduce the localized impact erosion damage and evaluate the damage formation. Additionally, droplet impact analyses were carried out to investigate the correlation between isolate pit profile and micro-jet velocity. We confirmed that the value of depth/radius was applicable to estimate micro-jet velocity, and the velocity at 560W in MIMTM equivalent to 1MW proton beam injection was ∼ 102m/s approximately.
{"title":"Micro-Impact Damage Caused by Mercury Bubble Collapse","authors":"M. Futakawa, T. Naoe, H. Kogawa, H. Date, Y. Ikeda","doi":"10.1299/JSMEA.48.234","DOIUrl":"https://doi.org/10.1299/JSMEA.48.234","url":null,"abstract":"High-power spallation targets for neutron sources are being developed in the world. Mercury target will be installed at the material science and life facility in J-PARC, which will promote innovative science. The mercury target will be subjected to the pressure wave caused by proton bombarding in the mercury. The pressure wave propagation induces the cavitation in mercury that imposes localized impact damage on the target vessel. The impact erosion is a critical issue to decide the lifetime of target. An electromagnetic impact testing machine, MIMTM, was developed to reproduce the localized impact erosion damage and evaluate the damage formation. Additionally, droplet impact analyses were carried out to investigate the correlation between isolate pit profile and micro-jet velocity. We confirmed that the value of depth/radius was applicable to estimate micro-jet velocity, and the velocity at 560W in MIMTM equivalent to 1MW proton beam injection was ∼ 102m/s approximately.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132328645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The possibilities of application of DLC-Si coating to the die in dry ironing process have been investigated by strip-ironing type tribometer. Alloy tool steel and high speed steel were used as substrate material for ironing dies. Two types of substrate surface texture were prepared by lapping and grinding. And two types of die edge angle were prepared. High tensile strength steel and brass were tested as workpieces. The surface appearance of die, friction coefficient during ironing and surface roughness of ironed workpiece were measured. The friction coefficient of DLC-Si coated die in the dry ironing process is relatively low. Galling does not occur on the die surface. In case of high tensile strength steel, the damage grows with the number of tests. The surface roughness of a brass workpiece does not increase with repeat ironing. The DLC-Si coating could be applied to the dry ironing process in this investigated condition.
{"title":"Application of DLC Coating to Ironing Die","authors":"K. Dohda, H. Kubota, Y. Tsuchiya","doi":"10.1299/JSMEA.48.286","DOIUrl":"https://doi.org/10.1299/JSMEA.48.286","url":null,"abstract":"The possibilities of application of DLC-Si coating to the die in dry ironing process have been investigated by strip-ironing type tribometer. Alloy tool steel and high speed steel were used as substrate material for ironing dies. Two types of substrate surface texture were prepared by lapping and grinding. And two types of die edge angle were prepared. High tensile strength steel and brass were tested as workpieces. The surface appearance of die, friction coefficient during ironing and surface roughness of ironed workpiece were measured. The friction coefficient of DLC-Si coated die in the dry ironing process is relatively low. Galling does not occur on the die surface. In case of high tensile strength steel, the damage grows with the number of tests. The surface roughness of a brass workpiece does not increase with repeat ironing. The DLC-Si coating could be applied to the dry ironing process in this investigated condition.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128437463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
It has already been proven that bolt fasteners based on the double thread mechanism have an excellent anti-loosening performance. The purpose of this study is to establish a mass production method for these double thread bolts (DTBs) by thread rolling. The pitch ratio of the coarse thread and the fine thread of the target DTB is set as 2 to 1. A two-die roller with a plunge feed is employed as the rolling method due to its fine processing precision. The roller dies used in the experiments have special grooves on the external surface which follow the same outline as the thread profiles of the DTB. Using these special dies, the DTB can be successfully formed in the same process as single thread bolts. The deformation of a workpiece during rolling is examined, and the examination shows that the formed material smoothly fills the die grooves in each cross section. The rolled DTBs completely pass the loosening test with extremely severe vibration and impact, as specified in NAS3354. The tensile fatigue strength of the rolled DTB is about 100% greater than that of the cutting DTB.
{"title":"Development of Thread Rolled Anti-Loosening Bolts Based on the Double Thread Mechanism and a Performance Evaluation","authors":"T. Takemasu, H. Miyahara","doi":"10.1299/JSMEA.48.305","DOIUrl":"https://doi.org/10.1299/JSMEA.48.305","url":null,"abstract":"It has already been proven that bolt fasteners based on the double thread mechanism have an excellent anti-loosening performance. The purpose of this study is to establish a mass production method for these double thread bolts (DTBs) by thread rolling. The pitch ratio of the coarse thread and the fine thread of the target DTB is set as 2 to 1. A two-die roller with a plunge feed is employed as the rolling method due to its fine processing precision. The roller dies used in the experiments have special grooves on the external surface which follow the same outline as the thread profiles of the DTB. Using these special dies, the DTB can be successfully formed in the same process as single thread bolts. The deformation of a workpiece during rolling is examined, and the examination shows that the formed material smoothly fills the die grooves in each cross section. The rolled DTBs completely pass the loosening test with extremely severe vibration and impact, as specified in NAS3354. The tensile fatigue strength of the rolled DTB is about 100% greater than that of the cutting DTB.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126020242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For making the functional alloy powder from magnesium alloy scrap, Mg-Zn and Mg-Al-Zn powder mixtures, which aluminum and zinc powder were added with various contents to machined chips of AZ31 alloy, were mechanically alloyed for various milling times using planetary ball mill. Crystal phase formed in the obtained powder was investigated by X-ray di ff raction and Vickers hardness of the powder particles was measured for confirmations of the formed phases. In the case of Mg-2.5 mol%Zn powder mechanically alloyed for long milling time, super-saturated α -Mg phase with 2.5 mol%Zn concentration forms. The structures of Mg-28 and 52 mol%Zn powder consist of Mg 2 Zn 2 or MgZn 2 , Mg 7 Zn 3 phases and then these phases become to amorphous phase by milling for prolonged time. In the ternary Mg-Al-Zn system of composition range, which were (30-50) mol%Mg with Al / Zn = (90 / 10-60 / 40) molar ratio, Mg-(30-50) mol%Al-20 mol%Zn and Mg-(10-30) mol%Al-40 mol%Zn, icosahedron Mg 49 (Al,Zn) 32 phase as called the quasi crystal forms by the mechanical alloying for 72 ks.
{"title":"Crystal Structure Formed in Mechanical Alloying Process of Mg-Al-Zn Powder Mixture Using Magnesium Alloy Machined Chips","authors":"H. Oginuma, E. Yuasa","doi":"10.1299/JSMEA.48.381","DOIUrl":"https://doi.org/10.1299/JSMEA.48.381","url":null,"abstract":"For making the functional alloy powder from magnesium alloy scrap, Mg-Zn and Mg-Al-Zn powder mixtures, which aluminum and zinc powder were added with various contents to machined chips of AZ31 alloy, were mechanically alloyed for various milling times using planetary ball mill. Crystal phase formed in the obtained powder was investigated by X-ray di ff raction and Vickers hardness of the powder particles was measured for confirmations of the formed phases. In the case of Mg-2.5 mol%Zn powder mechanically alloyed for long milling time, super-saturated α -Mg phase with 2.5 mol%Zn concentration forms. The structures of Mg-28 and 52 mol%Zn powder consist of Mg 2 Zn 2 or MgZn 2 , Mg 7 Zn 3 phases and then these phases become to amorphous phase by milling for prolonged time. In the ternary Mg-Al-Zn system of composition range, which were (30-50) mol%Mg with Al / Zn = (90 / 10-60 / 40) molar ratio, Mg-(30-50) mol%Al-20 mol%Zn and Mg-(10-30) mol%Al-40 mol%Zn, icosahedron Mg 49 (Al,Zn) 32 phase as called the quasi crystal forms by the mechanical alloying for 72 ks.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"282 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131786734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Naoe, M. Futakawa, A. Naito, H. Kogawa, Y. Ikeda, Y. Motohashi
Target vessel materials used in spallation neutron source will be exposed to proton and neutron irradiation and mercury immersion environments. In order to evaluate the surface degradation of the vessel candidate materials due to such environment, the triple-ion beam irradiation taking the spallation reaction into account and mercury immersion tests were carried out. Mechanical properties of the gradient surface layer were evaluated by the inverse analysis with multi-layer model that considers distribution of surface characteristic was applied to the load and depth curves measured by using the instrumented indentation machine. Transmission electron microscopic observations were performed to evaluate the changes of microstructure in irradiated surface layer using focused ion-beam cut micro-specimen. The mechanical properties distributions in the surface layer were evaluated quantitatively and the changes in microstructures were correspondent to the property distribution. It was confirmed that the ductility loss is enhanced by the irradiation and mercury immersion, and simulated stress and strain curves of the ion-irradiated surface layer were adequately in good agreement with the curves of experimental equivalent neutron-irradiated material.
{"title":"Evaluation of Mechanical Properties and Microstructure in Ion-Irradiated Surface Layer","authors":"T. Naoe, M. Futakawa, A. Naito, H. Kogawa, Y. Ikeda, Y. Motohashi","doi":"10.1299/JSMEA.48.280","DOIUrl":"https://doi.org/10.1299/JSMEA.48.280","url":null,"abstract":"Target vessel materials used in spallation neutron source will be exposed to proton and neutron irradiation and mercury immersion environments. In order to evaluate the surface degradation of the vessel candidate materials due to such environment, the triple-ion beam irradiation taking the spallation reaction into account and mercury immersion tests were carried out. Mechanical properties of the gradient surface layer were evaluated by the inverse analysis with multi-layer model that considers distribution of surface characteristic was applied to the load and depth curves measured by using the instrumented indentation machine. Transmission electron microscopic observations were performed to evaluate the changes of microstructure in irradiated surface layer using focused ion-beam cut micro-specimen. The mechanical properties distributions in the surface layer were evaluated quantitatively and the changes in microstructures were correspondent to the property distribution. It was confirmed that the ductility loss is enhanced by the irradiation and mercury immersion, and simulated stress and strain curves of the ion-irradiated surface layer were adequately in good agreement with the curves of experimental equivalent neutron-irradiated material.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129807655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Sakamoto, Y. Kogo, T. Yasuno, J. Taniguchi, I. Miyamoto
The influence of heat treatment on the mechanical properties of DLC deposited by FIB-CVD was examined. To evaluate the mechanical properties, Young’s modulus and Vickers hardness were measured by the nano indentation tester. For the characterization of DLC structure, Raman scattering was used. The microstructures of samples were characterized by HRTEM equipped with EELS. From results of the indentation experiments, it was found that Young’s modulus and Vickers hardness decreased with increasing heat treatment temperature. Analysis of Raman and EELS spectra indicated that the decrease of Young’s modulus and hardness was caused by the decrease of sp3 fraction.
{"title":"Influence of Heat Treatment on Mechanical Properties of DLC Deposited by FIB-CVD","authors":"N. Sakamoto, Y. Kogo, T. Yasuno, J. Taniguchi, I. Miyamoto","doi":"10.1299/JSMEA.48.275","DOIUrl":"https://doi.org/10.1299/JSMEA.48.275","url":null,"abstract":"The influence of heat treatment on the mechanical properties of DLC deposited by FIB-CVD was examined. To evaluate the mechanical properties, Young’s modulus and Vickers hardness were measured by the nano indentation tester. For the characterization of DLC structure, Raman scattering was used. The microstructures of samples were characterized by HRTEM equipped with EELS. From results of the indentation experiments, it was found that Young’s modulus and Vickers hardness decreased with increasing heat treatment temperature. Analysis of Raman and EELS spectra indicated that the decrease of Young’s modulus and hardness was caused by the decrease of sp3 fraction.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132863524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the past, the most common assumption in every explicit modelling of individual powders for compaction is that powders have only one single size which are arranged uniformly. However, all powders used in practice have a distribution of particle size and random initial arrangement. In this work, a systematic theoretical study of the effects of initial powder arrangement and distribution of size has been investigated using numerical analysis tool. Various types of elements have been considered first. Considering the accuracy and the effort required, the two-dimensional plane strain element has been employed for the rest of the investigation. The initial arrangement of powder and the distribution of powder size were considered separately. The results show that the initial arrangement has significant influence on the macroscopic behaviour while the powder size has little influence. Both factors have noticeable influence on the microscopic behaviour.
{"title":"Effects of Powder Size and Initial Arrangement on Cold Compaction","authors":"W. Tanwongwan, A. Manonukul, J. Carmai","doi":"10.1299/JSMEA.48.376","DOIUrl":"https://doi.org/10.1299/JSMEA.48.376","url":null,"abstract":"In the past, the most common assumption in every explicit modelling of individual powders for compaction is that powders have only one single size which are arranged uniformly. However, all powders used in practice have a distribution of particle size and random initial arrangement. In this work, a systematic theoretical study of the effects of initial powder arrangement and distribution of size has been investigated using numerical analysis tool. Various types of elements have been considered first. Considering the accuracy and the effort required, the two-dimensional plane strain element has been employed for the rest of the investigation. The initial arrangement of powder and the distribution of powder size were considered separately. The results show that the initial arrangement has significant influence on the macroscopic behaviour while the powder size has little influence. Both factors have noticeable influence on the microscopic behaviour.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130582952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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