Taewon Kim, T. Suto, Junya Kobayashi, Jongcheol Kim, Y. Suga
A prototype of autonomous mobile robot with two vision sensors for automatic welding of steel plates was constructed. The robot can move straight, steer and turn around the robot center by controlling the driving speed of the two wheels respectively. At the tip of the movable arm, two CCD cameras are fixed. A local camera observes the welding line near the welding torch and another wide camera observes relatively wide area in front of the welding part. The robot controls the traveling speed in accordance with the shape of the welding line. In the case of straight welding line, the speed of the robot is accelerated and the welding efficiency is improved. However, if the robot finds a corner of welding line, the speed is decelerated in order to realize the precise seam tracking and stable welding. Therefore, the robot can realize precise and high speed seam-tracking by controlling the travel speed. The effectiveness of the control system is confirmed by welding experiments.
{"title":"Automatic Welding System Using Speed Controllable Autonomous Mobile Robot","authors":"Taewon Kim, T. Suto, Junya Kobayashi, Jongcheol Kim, Y. Suga","doi":"10.1299/JSMEA.49.53","DOIUrl":"https://doi.org/10.1299/JSMEA.49.53","url":null,"abstract":"A prototype of autonomous mobile robot with two vision sensors for automatic welding of steel plates was constructed. The robot can move straight, steer and turn around the robot center by controlling the driving speed of the two wheels respectively. At the tip of the movable arm, two CCD cameras are fixed. A local camera observes the welding line near the welding torch and another wide camera observes relatively wide area in front of the welding part. The robot controls the traveling speed in accordance with the shape of the welding line. In the case of straight welding line, the speed of the robot is accelerated and the welding efficiency is improved. However, if the robot finds a corner of welding line, the speed is decelerated in order to realize the precise seam tracking and stable welding. Therefore, the robot can realize precise and high speed seam-tracking by controlling the travel speed. The effectiveness of the control system is confirmed by welding experiments.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115606894","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}
S. Edwards, A. Bakker, J. Neijenhuis, W. Kool, L. Katgerman
For production of complex hollow 6xxx series aluminium extrusions, porthole dies are the predominant tooling set up. In porthole dies, the billet is divided into multiple metal streams, which are rejoined in the weld chamber to form ‘longitudinal weld seams’. Fundamental understanding of the solid state bonding process, as well as the ability to detect a well bonded (or a defective) weld seam are important for the production of high quality structural hollow extrusions. A study is being conducted to investigate the solid state bonding and weld seam formation processes during extrusion. The method chosen was to use a thermo-mechanical simulator (Gleeble 3500), thereby having the ability to vary process parameters such as strain, strain rate and temperature. The alloy investigated was primary and remelt AA6082. It was determined that the key parameter for bonding is surface stretching (creation of new surface at the interface) and bonding time.
{"title":"The Influence of the Solid-State Bonding Process on the Mechanical Integrity of Longitudinal Weld Seams","authors":"S. Edwards, A. Bakker, J. Neijenhuis, W. Kool, L. Katgerman","doi":"10.1299/JSMEA.49.63","DOIUrl":"https://doi.org/10.1299/JSMEA.49.63","url":null,"abstract":"For production of complex hollow 6xxx series aluminium extrusions, porthole dies are the predominant tooling set up. In porthole dies, the billet is divided into multiple metal streams, which are rejoined in the weld chamber to form ‘longitudinal weld seams’. Fundamental understanding of the solid state bonding process, as well as the ability to detect a well bonded (or a defective) weld seam are important for the production of high quality structural hollow extrusions. A study is being conducted to investigate the solid state bonding and weld seam formation processes during extrusion. The method chosen was to use a thermo-mechanical simulator (Gleeble 3500), thereby having the ability to vary process parameters such as strain, strain rate and temperature. The alloy investigated was primary and remelt AA6082. It was determined that the key parameter for bonding is surface stretching (creation of new surface at the interface) and bonding time.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122735355","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 in-plane problem relating to the elastodynamic response of edge crack in an infinitely long elastic strip is analyzed. Fourier transform is used to reduce the mixed boundary value problem to Fredholm integral equation of second kind which was solved numerically to calculate the stress intensity factor at the tip of the crack. Stress intensity factor for various geometry parameters and frequency has been plotted to show the effect of strip width on stress intensity factor. Also normal stress at distant points from the crack has been evaluated numerically and plotted for various parameters.
{"title":"Diffraction of P-Waves by Edge Crack in an Infinitely Long Elastic Strip","authors":"Nasima Munshi, S. Mandal","doi":"10.1299/JSMEA.49.116","DOIUrl":"https://doi.org/10.1299/JSMEA.49.116","url":null,"abstract":"The in-plane problem relating to the elastodynamic response of edge crack in an infinitely long elastic strip is analyzed. Fourier transform is used to reduce the mixed boundary value problem to Fredholm integral equation of second kind which was solved numerically to calculate the stress intensity factor at the tip of the crack. Stress intensity factor for various geometry parameters and frequency has been plotted to show the effect of strip width on stress intensity factor. Also normal stress at distant points from the crack has been evaluated numerically and plotted for various parameters.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115245662","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}
Al2O3-TiC powders were produced from microwave and conventional-combustion synthesized mixtures of TiO2, C and Al. Different types of precursors such as rutile and anatase TiO2, as well as carbon black, graphite and activated carbon powders were used. The different types of precursors and heating methods affected the combustion behavior. Combustion using microwaves could be achieved in less than 3 min, which was 10 times faster than conventional combustion. The composition of rutile-carbon black-aluminum gave the shortest ignition time using microwave energy, whereas the mixture containing activated carbon ignited fastest using conventional heating. Nevertheless, in both cases samples with anatase required longer time to ignite and thus gave higher combustion temperatures than ones with rutile. An incomplete combustion product observed when activated carbon was the carbon source. The synthesized powder was fragmented and angular in shape with the largest agglomerate size limited to smaller than 25 microns.
{"title":"Synthesis and Characterization of Microwave and Conventional Combustion Synthesized Alumina-Titanium Carbide Powders","authors":"M. Kitiwan, D. Atong","doi":"10.1299/JSMEA.49.85","DOIUrl":"https://doi.org/10.1299/JSMEA.49.85","url":null,"abstract":"Al2O3-TiC powders were produced from microwave and conventional-combustion synthesized mixtures of TiO2, C and Al. Different types of precursors such as rutile and anatase TiO2, as well as carbon black, graphite and activated carbon powders were used. The different types of precursors and heating methods affected the combustion behavior. Combustion using microwaves could be achieved in less than 3 min, which was 10 times faster than conventional combustion. The composition of rutile-carbon black-aluminum gave the shortest ignition time using microwave energy, whereas the mixture containing activated carbon ignited fastest using conventional heating. Nevertheless, in both cases samples with anatase required longer time to ignite and thus gave higher combustion temperatures than ones with rutile. An incomplete combustion product observed when activated carbon was the carbon source. The synthesized powder was fragmented and angular in shape with the largest agglomerate size limited to smaller than 25 microns.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115310069","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 LIGA (Lithografie, Galvanoformung, Abformung [German: lithography, electroplating, and molding]) process is one of the promising techniques for fabrication of microstructures having high aspect ratios. Microstructures as high as a few hundred µm or more are widely used for various devices, such as micro-actuators, micro-mechanisms, and micro-sensors. The key to reducing the microstructure fabrication cost of the LIGA process is by using micro replication technology. Hot embossing is attracting the attention of engineers as one such technology for economically mass-fabricating microstructures on thin plastic sheets. This technology is especially effective for precisely replicating micro patterns on relatively large sheets. This paper describes the results of research the authors recently carried out to find the optimal conditions for hot embossing in the atmosphere and in a vacuum. For a series of experiments, we prepared two types of Ni molds each containing an area of 33 × 33mm2 distributed with hole or column patterns 60µm in diameter and 1.0 in aspect ratio. The LIGA process using synchrotron radiation fabricated these patterns. From the experiments, we could determine the optimal conditions for replicating these patterns on PMMA sheets in a normal-atmosphere and vacuum environments.
LIGA (Lithografie, Galvanoformung, Abformung[德语:光刻，电镀和成型])工艺是制造具有高纵横比的微结构的有前途的技术之一。高达几百微米或更大的微结构被广泛用于各种器件，如微致动器、微机构和微传感器。采用微复制技术是降低LIGA工艺微结构制造成本的关键。热压印技术作为一种在塑料薄板上经济批量制造微结构的技术，正受到工程技术人员的关注。这种技术对于在相对较大的薄片上精确复制微图案特别有效。本文介绍了作者最近进行的研究结果，以找到在大气和真空中进行热压印的最佳条件。为了进行一系列的实验，我们制备了两种类型的Ni模具，每种模具的面积为33 × 33mm2，分布为直径60µm，宽高比1.0的孔或柱图案。LIGA过程使用同步辐射制造了这些图案。从实验中，我们可以确定在正常气氛和真空环境下在PMMA片上复制这些图案的最佳条件。
{"title":"Precise Micro Pattern Replication by Hot Embossing","authors":"K. Idei, H. Mekaru, Hiroaki Takeda, T. Hattori","doi":"10.1299/JSMEA.49.69","DOIUrl":"https://doi.org/10.1299/JSMEA.49.69","url":null,"abstract":"The LIGA (Lithografie, Galvanoformung, Abformung [German: lithography, electroplating, and molding]) process is one of the promising techniques for fabrication of microstructures having high aspect ratios. Microstructures as high as a few hundred µm or more are widely used for various devices, such as micro-actuators, micro-mechanisms, and micro-sensors. The key to reducing the microstructure fabrication cost of the LIGA process is by using micro replication technology. Hot embossing is attracting the attention of engineers as one such technology for economically mass-fabricating microstructures on thin plastic sheets. This technology is especially effective for precisely replicating micro patterns on relatively large sheets. This paper describes the results of research the authors recently carried out to find the optimal conditions for hot embossing in the atmosphere and in a vacuum. For a series of experiments, we prepared two types of Ni molds each containing an area of 33 × 33mm2 distributed with hole or column patterns 60µm in diameter and 1.0 in aspect ratio. The LIGA process using synchrotron radiation fabricated these patterns. From the experiments, we could determine the optimal conditions for replicating these patterns on PMMA sheets in a normal-atmosphere and vacuum environments.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127810674","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}
Since the ceramic has excellent qualities in light weight, abrasion resistance and heat resistance etc, compared with the metal, it has been actively examined in order to apply for the structures such as gas turbine and turbo charger etc, which require high strength and heat resistance. But it is not desirable to be used for the structural material since the ceramic is fragile, so the join with the metal with abundant toughnees has been studied. However, during the cooling process, the joint residual stress develops on the ceramic/metal joint by the difference in thermal expansion coefficient between two materials and it affects the bending strength significantly. Also, in order to use the joint material as the structural material, the study about the fatigue of thermal cycle of actual use statement is necessary. Therefore, to ensure security and improvement of the bending strength of joint material, the state of residual stress distribution to the high temperature-thermal cycle, and studied the effects of thermal cycle and state of residual stress distribution on the strength of joint material as well.
{"title":"Evaluation of Design Strength and Residual Stress in Ceramic/Metal Joint","authors":"S. Huh, W. Park, Sung Ho Park","doi":"10.1299/JSMEA.49.48","DOIUrl":"https://doi.org/10.1299/JSMEA.49.48","url":null,"abstract":"Since the ceramic has excellent qualities in light weight, abrasion resistance and heat resistance etc, compared with the metal, it has been actively examined in order to apply for the structures such as gas turbine and turbo charger etc, which require high strength and heat resistance. But it is not desirable to be used for the structural material since the ceramic is fragile, so the join with the metal with abundant toughnees has been studied. However, during the cooling process, the joint residual stress develops on the ceramic/metal joint by the difference in thermal expansion coefficient between two materials and it affects the bending strength significantly. Also, in order to use the joint material as the structural material, the study about the fatigue of thermal cycle of actual use statement is necessary. Therefore, to ensure security and improvement of the bending strength of joint material, the state of residual stress distribution to the high temperature-thermal cycle, and studied the effects of thermal cycle and state of residual stress distribution on the strength of joint material as well.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123836168","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 study on the bending of an elliptical plate clamped rigidly against deflection and restrained elastically against rotation along its periphery, subjected to the uniform lateral load and in-plane force simultaneously, is performed by introducing the elliptical coordinates. The analytical solution satisfying perfectly the differential equation of deflection and the boundary conditions is exactly derived in the form of Mathieu function series. The expressions for the bending moments are also derived rigorously. The deflection and bending moments obtained here coincide with those for a simply supported elliptical plate and the perfectly clamped elliptical plate when the rotational spring stiffness is zero and infinity, respectively. A limiting case of a circular plate is discussed in detail. The effects of the in-plane force and the rotational spring stiffness on the deflection and the bending moments are calculated numerically and are presented in tables and figures.
{"title":"Bending of an Elastically Restrained Elliptical Plate under the Combined Action of Lateral Load and In-Plane Force","authors":"Kenzo Sato","doi":"10.1299/JSMEA.49.130","DOIUrl":"https://doi.org/10.1299/JSMEA.49.130","url":null,"abstract":"The study on the bending of an elliptical plate clamped rigidly against deflection and restrained elastically against rotation along its periphery, subjected to the uniform lateral load and in-plane force simultaneously, is performed by introducing the elliptical coordinates. The analytical solution satisfying perfectly the differential equation of deflection and the boundary conditions is exactly derived in the form of Mathieu function series. The expressions for the bending moments are also derived rigorously. The deflection and bending moments obtained here coincide with those for a simply supported elliptical plate and the perfectly clamped elliptical plate when the rotational spring stiffness is zero and infinity, respectively. A limiting case of a circular plate is discussed in detail. The effects of the in-plane force and the rotational spring stiffness on the deflection and the bending moments are calculated numerically and are presented in tables and figures.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121254490","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}
Yongbum Choi, G. Sasaki, K. Matsugi, N. Sorida, S. Kondoh, T. Fujii, O. Yanagisawa
Metal-fiber-preform-reinforced aluminum alloy composites were prepared by the infiltration of molten metal using a low-pressure casting process. The infiltration behavior of the filling pattern and the velocity profile obtained for alloys fabricated by the low-pressure casting process was investigated. A thermocouple was inserted into the preform to observe the infiltration behavior. The infiltrations at pressure acceleration times of 1sec, 2sec and 5sec under a constant pressure of 0.4MPa were respectively complete in 0.4sec, 0.8sec and 1.2sec. Under these conditions, molten aluminum alloy successfully infiltrated on FeCrSi metal fiber preform by the low-pressure casting process. The porosity of composites was observed to determine their reliability. An automobile piston was developed with an FeCrSi-reinforced aluminum alloy that has 0% porosity using the optimal applied pressure and pressure acceleration times.
{"title":"Simulation of Infiltration of Molten Alloy to Porous Preform Using Low Pressure","authors":"Yongbum Choi, G. Sasaki, K. Matsugi, N. Sorida, S. Kondoh, T. Fujii, O. Yanagisawa","doi":"10.1299/JSMEA.49.20","DOIUrl":"https://doi.org/10.1299/JSMEA.49.20","url":null,"abstract":"Metal-fiber-preform-reinforced aluminum alloy composites were prepared by the infiltration of molten metal using a low-pressure casting process. The infiltration behavior of the filling pattern and the velocity profile obtained for alloys fabricated by the low-pressure casting process was investigated. A thermocouple was inserted into the preform to observe the infiltration behavior. The infiltrations at pressure acceleration times of 1sec, 2sec and 5sec under a constant pressure of 0.4MPa were respectively complete in 0.4sec, 0.8sec and 1.2sec. Under these conditions, molten aluminum alloy successfully infiltrated on FeCrSi metal fiber preform by the low-pressure casting process. The porosity of composites was observed to determine their reliability. An automobile piston was developed with an FeCrSi-reinforced aluminum alloy that has 0% porosity using the optimal applied pressure and pressure acceleration times.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131937839","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}
O. Shimada, S. Kusumi, H. Mekaru, N. Sato, M. Shimizu, M. Yamashita, T. Hattori
We developed a method for fabricating a three-dimensional spiral micro-inductor with high inductance using the LIGA process. The spiral inductor created had a diameter of 0.5mm, and a length of 1mm. The width of the spiral line was 10µm, the pitch was 20µm, and the number of turns was 15. It was made of plated copper. The master was a brass round bar coated with PMMA resist. Deep X-ray lithography was employed to fabricate a master for a metallic mold at the NewSUBARU synchrotron radiation facility, University of Hyogo. The inductor core was made of resin by injection molding. It has a spiral micro flute on the surface. We chose the worm injection molding technique in order to avoid the parting line across the spiral line. The worm injection molding was the method─for demolding the work such as that used in loosening a screw.
{"title":"Fabrication of Spiral Micro-Coil Utilizing LIGA Process","authors":"O. Shimada, S. Kusumi, H. Mekaru, N. Sato, M. Shimizu, M. Yamashita, T. Hattori","doi":"10.1299/JSMEA.49.74","DOIUrl":"https://doi.org/10.1299/JSMEA.49.74","url":null,"abstract":"We developed a method for fabricating a three-dimensional spiral micro-inductor with high inductance using the LIGA process. The spiral inductor created had a diameter of 0.5mm, and a length of 1mm. The width of the spiral line was 10µm, the pitch was 20µm, and the number of turns was 15. It was made of plated copper. The master was a brass round bar coated with PMMA resist. Deep X-ray lithography was employed to fabricate a master for a metallic mold at the NewSUBARU synchrotron radiation facility, University of Hyogo. The inductor core was made of resin by injection molding. It has a spiral micro flute on the surface. We chose the worm injection molding technique in order to avoid the parting line across the spiral line. The worm injection molding was the method─for demolding the work such as that used in loosening a screw.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"202 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132949201","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 size effect of the diameter has been assessed for the tensile strength of Tyranno ZMI fiber. Uniform diameter section in sample fibers has been selected as tensile test sample. The single fibers of measured diameters have been tensile tested to provide two groups of data, i.e., “small diameter” group and “large diameter” group. The parameters of single-modal Weibull model showed inconsistency on the two groups, thus the Weibull parameters have shown the dependence on the sample diameter. Scanning electron microscope (SEM) analyses had revealed characteristic fracture patterns of “extremely weak” samples only in “large diameter” group. The key information for improving the reliability was then discussed through coupling the Weibull scaling and the fracture surface analyses. The potential in the strength improvement has been assessed for an imaginary fiber, which does not contain the sources of the characteristic fracture patterns.
{"title":"Strength Improvement on an Imaginary SiC Fiber of Ideal Diameter and Reduced Internal Defects Estimated from the Weibull Scaling of Tyranno ZMI Fiber","authors":"T. Morimoto, Koji Yamamoto, S. Ogihara","doi":"10.1299/JSMEA.49.15","DOIUrl":"https://doi.org/10.1299/JSMEA.49.15","url":null,"abstract":"The size effect of the diameter has been assessed for the tensile strength of Tyranno ZMI fiber. Uniform diameter section in sample fibers has been selected as tensile test sample. The single fibers of measured diameters have been tensile tested to provide two groups of data, i.e., “small diameter” group and “large diameter” group. The parameters of single-modal Weibull model showed inconsistency on the two groups, thus the Weibull parameters have shown the dependence on the sample diameter. Scanning electron microscope (SEM) analyses had revealed characteristic fracture patterns of “extremely weak” samples only in “large diameter” group. The key information for improving the reliability was then discussed through coupling the Weibull scaling and the fracture surface analyses. The potential in the strength improvement has been assessed for an imaginary fiber, which does not contain the sources of the characteristic fracture patterns.","PeriodicalId":170519,"journal":{"name":"Jsme International Journal Series A-solid Mechanics and Material Engineering","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122160670","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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