Journal of the Japanese Society for Experimental Mechanics最新文献

{"title":"Evaluation of Water Flow and Oxygen Uptake of Sponge Support Media in DHS Reactor Developed for Sewage Treatment in Developing Countries","authors":"T. Okubo, Masanobu Takahashi, K. Kubota, H. Harada, Masateru Tokita, S. Uemura, K. Maeno","doi":"10.11395/JJSEM.15.30","DOIUrl":"https://doi.org/10.11395/JJSEM.15.30","url":null,"abstract":"Down-flow hanging sponge (DHS) reactor has been developed mainly for sewage treatment in developing countries. The novel rector employs polyurethane sponge material as support media, which promises a proliferation of a large amount of biomass, and thus an excellent capability of removing pollutants. The characterization of the three types of sponge support media is conducted in respect of water flow and oxygen uptake ability. Water was supplied to the device which consisted of 40 sponge media connected in series, and then tracer experiment was carried out. The ratios of actual hydraulic retention time (HRT) per theoretical HRT were in the range of 25-67% depending on the type of support media, meaning that short circuit flow occurs in this type of reactor. By supplying deoxygenized water from the top of the device, overall volumetric oxygen transfer coefficient, KLa, was evaluated. In spite of the non-aerated conditions, the KLa values were so high, 0.56-4.88 (1/min), surpassing those of other mechanically aerated aerobic processes. Furthermore, it was found that the suspended solids (SS) concentration in the influent played a role to increase the ratio of actual HRT/theoretical HRT, meaning that management of the influent SS concentration is prerequisite for preventing the clogging problem in the DHS.","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132517704","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}

{"title":"Degradation Mechanism of the Golf Balls in High Temperature and High Humidity Environment and Development of Its Evaluation Technique","authors":"T. Matsuo, Asuka Haseyama","doi":"10.11395/JJSEM.15.58","DOIUrl":"https://doi.org/10.11395/JJSEM.15.58","url":null,"abstract":"In order to detect degradation in golf balls, degradation mechanism in golf ball was investigated and ultrasonic testing technique was applied to evaluate degradation in golf balls. Degradation mechanism of golf ball was first studied during water, high temperature and high temperature with high humidity environment. Degradation was evaluated by using restitution test, indentation test and compression test. Coefficient of restitution and hardness were rapidly changed in high temperature with high humidity environment, respectively. Hardness of the cover increased with increasing test time and hardness of core decreased with increasing test time. There was good relationship between change in hardness of cover and compression stiffness that detected in compression test in the balls used in this study. Ultrasonic testing was next applied. Change in arrival time of symmetrical mode wave that was propagated in the cover was corresponded to the change of hardness in the cover. Thus, degradation of the golf ball was roughly estimated by using ultrasonic technique in this case. In order to detect degradation in golf balls, degradation mechanism in golf ball was investigated and ultrasonic testing technique was applied to evaluate degradation in golf balls. Degradation mechanism of golf ball was first studied during water, high temperature and high temperature with high humidity environment. Degradation was evaluated by using restitution test, indentation test and compression test. Coefficient of restitution and hardness were rapidly changed in high temperature with high humidity environment, respectively. Hardness of the cover increased with increasing test time and hardness of core decreased with increasing test time. There was good relationship between change in hardness of cover and compression stiffness that detected in compression test in the balls used in this study. Ultrasonic testing was next applied. Change in arrival time of symmetrical mode wave that was propagated in the cover was corresponded to the change of hardness in the cover. Thus, degradation of the golf ball was roughly estimated by using ultrasonic technique in this case.","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122433045","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}

{"title":"Primary Study on Efficiency Improvement of Ozonation in Water Treatment Process","authors":"S. Yagi, Shigeakira Saito","doi":"10.11395/JJSEM.15.19","DOIUrl":"https://doi.org/10.11395/JJSEM.15.19","url":null,"abstract":"","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132733684","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}

{"title":"Development of New Welding Spatter Adhesion Preventive Agent made of Water and Foodstuffs","authors":"A. Takahashi, Naoyuki Yamamoto, T. Toyohiro","doi":"10.11395/JJSEM.15.38","DOIUrl":"https://doi.org/10.11395/JJSEM.15.38","url":null,"abstract":"The Shielded metal arc welding is mostly popular for fused injection method of metal to metal. The spatter particle of various sizes appears during the metal arc welding, and then adheres so strongly on the surface of welded plate. In general, the commercial spatter adhesion preventive agent is coated on the surface of plate before welding. However, the agent from artificial organic synthesis has several problem, such as influence of global environmental and human health, stink and expensive. The purpose of this study is to develop the new welding spatter adhesion preventive agent made of water, flour powder and honey, which brings the environmental merit, no stink and low cost. Effective contents among water, flour and honey was confirmed by sensory evaluation test and experimental observation after welding. The results of tensile inspection test of a butt welded specimen of SS400 and hydrogen analysis by JIS Z3118 satisfied welded strength and the reliability of welding. Anti-adhesive mechanism was discussed based on heat characteristics and observation of boundary between spatter and surface of welded plate. Another combinations as grain or starch powder and syrup with spatter anti-adhesive effect were also described.","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"1 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132076820","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}

{"title":"Thermal Deformation Measurement for Light Emitting Diode using Digital Image Correlation Method with Spectrograph technique","authors":"S. Miyake, H. Taguchi, K. Morino, K. Ikeda","doi":"10.11395/JJSEM.14.238","DOIUrl":"https://doi.org/10.11395/JJSEM.14.238","url":null,"abstract":"Thermal Deformation Measurement for Light Emitting Diode using Digital Image Correlation Method with Spectrograph technique Shugo MIYAKE, Hideyuki TAGUCHI, Katsuya MORINO and Ken-ichi IKEDA An effective thermal deformation measurement technique for high power light emitting diode (LED) during emitting the light was developed using digital image correlation method (DICM) with spectrograph. Camera image detected by charge coupled device (CCD) during emitting light from LED was affected by two causes, an intensity of emitting light which depends on wavelength and a radiant intensity of exothermic heat which depends on temperature. Optimization of detected wavelength by band-path filter, in consideration of emission wavelength and surface temperature of the LED with the Plank's radiation law, was absolutely improved quality of CCD camera image. The measured thermal deformation of the encapsulation resin molded the LED on epoxy glass substrate was up to 30μm in z-axis displacement over 400K of exothermic heat temperature with 350mA by the developed technique.","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115586950","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}

{"title":"A Convenient Identification Method of Metal Material Mechanical Properties Based on Micro to Milli Indentation Test","authors":"J. Sakamoto, G. Fujii, Masayuki Nakamura","doi":"10.11395/JJSEM.14.257","DOIUrl":"https://doi.org/10.11395/JJSEM.14.257","url":null,"abstract":"A Convenient Identification Method of Metal Material Mechanical Properties Based on Micro to Milli Indentation Test Junji SAKAMOTO, Garuda FUJII and Masayuki NAKAMURA This paper presents a new and convenient process for determining the material plasticity parameters of metal materials through an indentation test conducted using a Rockwell testing machine and FE analysis. Identified parameters almost coincide with practical values. The proposed method can be used to evaluate the characteristics of materials on the order of micro to millimeters. First, the P−h curves of the indentation are determined by experiment. Second, FE analysis of the indentation test assuming plastic hardening behavior in power−law hardening material is specified by the stress–strain curve. The FE model consisted of the test piece material and the indenter with a spring element considered the elastic deformation of the measuring system. The material parameters can be identified based on the curve fit using the polynomial function consisting of material parameters. The best solution is determined by using the response surface methodology. For identification example using steel and cupper alloy, the estimation of the plastic and elastic properties are possible for practical use.","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134010814","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}

{"title":"Identification of Elastic Material Characteristics of Dissimilar Materials by Virtual Fields Method","authors":"Yuya Sato, S. Arikawa, S. Yoneyama","doi":"10.11395/JJSEM.14.250","DOIUrl":"https://doi.org/10.11395/JJSEM.14.250","url":null,"abstract":"In this study, a method for identifying the material characteristics of dissimilar materials from measured displacement fields is proposed. The virtual fields method is employed for determining the material characteristics. The principle for identifying the characteristics of the dissimilar materials characteristics is described. The appropriate virtual displacements for the identification are automatically determined for minimizing the effect of the measurement errors. A three-point bending test and tensile tests are performed for validating the proposed method. Displacement distributions on a specimen surface are measured using mesh-based global digital image correlation. Then, the inverse analyses of material characteristics from the displacements under various loads are carried out. Results show that the elastic material characteristics of the dissimilar materials can be identified by the proposed method.","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133127177","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}

{"title":"Regular Breakup of Liquid Jet from Oblong Orifice and Production of Uniform-sized Droplets","authors":"Takashi Suzuki, Y. Morimoto, M. Ono, A. Mitsuishi, K. Kitamura","doi":"10.11395/JJSEM.14.271","DOIUrl":"https://doi.org/10.11395/JJSEM.14.271","url":null,"abstract":"Injecting liquid downward into the stationary atmosphere from an oblong-orifice of 0.15mm x 1.3mm, the breakup behavior of the liquid jet was observed in detail by flash photography. Test liquids employed were water, ethanol and aqua-solutions of propylene-glycol. Liquid injection velocity was ranging from 1 to 20 m/s. It was found that the liquid jet deformed into chains of bamboo-leaf-like liquid films, the edges of the liquid film became thick rims due to the surface contraction, the threaded-beads-like wave of short wave-length appeared on the rims, and the liquid jet broke up regularly due to the wave. The resulting droplets were more uniform and smaller than those of liquid jet from circular-orifice. Satellite droplets were also formed, but the generating frequency was not so high. The characteristics of interfacial wave on liquid jet and the size distribution of droplets were investigated by image analysis. Based on the results, the mechanism of regular breakup of the liquid jet from oblong-orifice was discussed. The effects of liquid properties upon the suitable velocity range for regular breakup were also examined. It was supported that the regular breakup of liquid jet should be of use as a simple methodology for uniform-sized","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126898799","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}

{"title":"Full-field Displacement Measurement Method for Large-scale Structures by Using Tile Patterns","authors":"S. Hayashi, S. Ri, H. Tsuda, S. Ogihara","doi":"10.11395/JJSEM.14.244","DOIUrl":"https://doi.org/10.11395/JJSEM.14.244","url":null,"abstract":"","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123111162","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}

{"title":"Practical Evaluations of the Convenient Identification Method of Metal Material Mechanical Properties Based on Micro to Milli Indentation Test","authors":"J. Sakamoto, Takayuki Kato, G. Fujii, Masayuki Nakamura","doi":"10.11395/JJSEM.14.264","DOIUrl":"https://doi.org/10.11395/JJSEM.14.264","url":null,"abstract":"Practical Evaluations of the Convenient Identification Method of Metal Material Mechanical Properties Based on Micro to Milli Indentation Test − Applicability Verification by Applying Press Working Process− Junji SAKAMOTO, Takayuki KATO, Garuda FUJII and Masayuki NAKAMURA For the purpose of a verification of an estimation method that material plasticity parameters are identified by using indentation test and FE analysis, experiment are carried out using the Rockwell testing machine on metal materials. The P−h curve obtained from the experiment and FE analysis, the characteristics of graph has almost the same curve. The material parameters can be identified based on the curve fit using the polynomial function consisting of material parameters. For example, steel metals using in the manufacturing process, the estimation of the work hardening parameters and the elastic properties were almost matched with the results of the tensile tests. Furthermore, the shapes of the actual drawing press and plastic deformation FE analysis using the material parameters of this identification are matched within the allowable range of profile error.","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126235712","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}