Pub Date : 2017-04-01DOI: 10.3969/J.ISSN.1007-2012.2017.02.004
F. Han, Wang X.-K., Yong Sun, Ding S.-C.
Chain die forming is a new type of sheet metal forming process. The material flow law and characteristics of chain die forming process were studied through simulation. The analysis results show that the maximum principal strain at the corner of the variable section forming part is larger, and the direction is perpendicular to the outside bending surface; the maximum principal strain at the concave arc region in the flange is tensile strain, which decreases along the height direction of flange from high to low; the flange height and forming angle have great influence on the longitudinal strain of the forming part, and increasing the height of the flange and forming angle can increase the longitudinal strain of the flange; the effect of material properties on the longitudinal strain of the forming part is small. The longitudinal strain of the variable cross section was extracted from the simulation model. The results show that the four arc zones in the flange of variable cross section part have larger longitudinal strain, where tensile or compressive deformation occur during forming process, but the equivalent plastic strain mainly concentrates in bending areas of variable cross section part. The simulated results were verified through experiment of chain die forming of variable cross section tests, and the experimental results are in good agreement with the simulation results.
{"title":"Mechanism of plastic deformation in chain die forming of variable cross section","authors":"F. Han, Wang X.-K., Yong Sun, Ding S.-C.","doi":"10.3969/J.ISSN.1007-2012.2017.02.004","DOIUrl":"https://doi.org/10.3969/J.ISSN.1007-2012.2017.02.004","url":null,"abstract":"Chain die forming is a new type of sheet metal forming process. The material flow law and characteristics of chain die forming process were studied through simulation. The analysis results show that the maximum principal strain at the corner of the variable section forming part is larger, and the direction is perpendicular to the outside bending surface; the maximum principal strain at the concave arc region in the flange is tensile strain, which decreases along the height direction of flange from high to low; the flange height and forming angle have great influence on the longitudinal strain of the forming part, and increasing the height of the flange and forming angle can increase the longitudinal strain of the flange; the effect of material properties on the longitudinal strain of the forming part is small. The longitudinal strain of the variable cross section was extracted from the simulation model. The results show that the four arc zones in the flange of variable cross section part have larger longitudinal strain, where tensile or compressive deformation occur during forming process, but the equivalent plastic strain mainly concentrates in bending areas of variable cross section part. The simulated results were verified through experiment of chain die forming of variable cross section tests, and the experimental results are in good agreement with the simulation results.","PeriodicalId":39811,"journal":{"name":"塑性工程学报","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44323558","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}
Pub Date : 2016-10-01DOI: 10.3969/J.ISSN.1007-2012.2016.05.018
Zhi-jian Zhang, S. Asgari, B. Rolfe
{"title":"Multi-scale modelling of mechanical behavior of dual-phase steels based on realistic microstructure","authors":"Zhi-jian Zhang, S. Asgari, B. Rolfe","doi":"10.3969/J.ISSN.1007-2012.2016.05.018","DOIUrl":"https://doi.org/10.3969/J.ISSN.1007-2012.2016.05.018","url":null,"abstract":"","PeriodicalId":39811,"journal":{"name":"塑性工程学报","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70176766","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}
Pub Date : 2013-01-01DOI: 10.3969/J.ISSN.1007-2012.2013.06.003
Y. K. Li, F. Liu, G. Zheng
Commercial-pure titanium(CP-Ti)was subjected to cryogenic rolling at liquid nitrogen temperatures.The microstructures of the samples were investigated by X-ray diffraction(XRD)and transmission electron microscopy(TEM).The mechanical properties of Ti prepared by cryogenic rolling were measured using nano-indentation.The experimental results showed that the mean grain size of Ti was refined from 57μm to 75nm after cryogenic rolling.The hardness of the nanostructured Ti is as high as 3.36GPa.
{"title":"Mechanical properties of nanostructured titanium prepared by cryogenic rolling","authors":"Y. K. Li, F. Liu, G. Zheng","doi":"10.3969/J.ISSN.1007-2012.2013.06.003","DOIUrl":"https://doi.org/10.3969/J.ISSN.1007-2012.2013.06.003","url":null,"abstract":"Commercial-pure titanium(CP-Ti)was subjected to cryogenic rolling at liquid nitrogen temperatures.The microstructures of the samples were investigated by X-ray diffraction(XRD)and transmission electron microscopy(TEM).The mechanical properties of Ti prepared by cryogenic rolling were measured using nano-indentation.The experimental results showed that the mean grain size of Ti was refined from 57μm to 75nm after cryogenic rolling.The hardness of the nanostructured Ti is as high as 3.36GPa.","PeriodicalId":39811,"journal":{"name":"塑性工程学报","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70176680","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}
Pub Date : 2011-12-01DOI: 10.3969/J.ISSN.1007-2012.2011.06.014
A. Razali, Jie-Hua Zhao, F. Law, Y. Qin
Efforts in micro-forming have been focused largely on fundamental studies and laboratory processes which may ignore some of the key issues related to production realization. A micro-forming machine alone, for example, without a proper handling-system, is seen to be impractical to meet industrial demands. Continuous production requires not just an efficient manufacturing machine, but also autonomous synchronization between the machine and the material-handling system itself. This is inclusive of the way in which the machine automatically transports the finished parts/products away from its working environment and automatically packs the parts/products for shipment. A handling-strategy was presented for the finished parts/products produced by micro-forming, with a focus on the investigation of the handling device and the development of design considerations for a new transportation system for a micro-sheet-forming machine developed at the University of Strathclyde, UK. FE simulation was employed to study the feeding characteristics and also the positional accuracy, and the system was constructed, followed by experimental validations.
{"title":"A part-transport design and the system for micro-forming applications","authors":"A. Razali, Jie-Hua Zhao, F. Law, Y. Qin","doi":"10.3969/J.ISSN.1007-2012.2011.06.014","DOIUrl":"https://doi.org/10.3969/J.ISSN.1007-2012.2011.06.014","url":null,"abstract":"Efforts in micro-forming have been focused largely on fundamental studies and laboratory processes which may ignore some of the key issues related to production realization. A micro-forming machine alone, for example, without a proper handling-system, is seen to be impractical to meet industrial demands. Continuous production requires not just an efficient manufacturing machine, but also autonomous synchronization between the machine and the material-handling system itself. This is inclusive of the way in which the machine automatically transports the finished parts/products away from its working environment and automatically packs the parts/products for shipment. A handling-strategy was presented for the finished parts/products produced by micro-forming, with a focus on the investigation of the handling device and the development of design considerations for a new transportation system for a micro-sheet-forming machine developed at the University of Strathclyde, UK. FE simulation was employed to study the feeding characteristics and also the positional accuracy, and the system was constructed, followed by experimental validations.","PeriodicalId":39811,"journal":{"name":"塑性工程学报","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70176614","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}
Pub Date : 2011-08-01DOI: 10.3969/J.ISSN.1007-2012.2011.04.005
Wang Chen, L. Juan, Cui Zhen-shan, Ruan Liqun
In order to study the hot deformation behavior of magnesium alloy AZ61 and establish rational process parameters,the flow stress of this material was investigated under temperature of 523K~673K and strain rate of 0.001s-1~1s-1 by Gleeble 1500 thermo-mechanical simulator.According to the test data,deformation activation energy was evaluated and the formulation of peak stress was established which is dependent on temperature and strain rate.Then two different methods were proposed to model the flow stress and their accuracy was verified.The results show that the relative deviation is 5.46% if the influence of strain is directly considered,while it is 5.42% if the influence of strain is indirectly considered by incorporating dynamic recrystallization volume fraction.Both models agree well with experimental results.
{"title":"Two methods for modeling the flow stress behavior of magnesium alloy AZ61 under hot deformation","authors":"Wang Chen, L. Juan, Cui Zhen-shan, Ruan Liqun","doi":"10.3969/J.ISSN.1007-2012.2011.04.005","DOIUrl":"https://doi.org/10.3969/J.ISSN.1007-2012.2011.04.005","url":null,"abstract":"In order to study the hot deformation behavior of magnesium alloy AZ61 and establish rational process parameters,the flow stress of this material was investigated under temperature of 523K~673K and strain rate of 0.001s-1~1s-1 by Gleeble 1500 thermo-mechanical simulator.According to the test data,deformation activation energy was evaluated and the formulation of peak stress was established which is dependent on temperature and strain rate.Then two different methods were proposed to model the flow stress and their accuracy was verified.The results show that the relative deviation is 5.46% if the influence of strain is directly considered,while it is 5.42% if the influence of strain is indirectly considered by incorporating dynamic recrystallization volume fraction.Both models agree well with experimental results.","PeriodicalId":39811,"journal":{"name":"塑性工程学报","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70176540","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}
Pub Date : 2011-06-01DOI: 10.3969/J.ISSN.1007-2012.2011.03.006
Jingzhong Li, N. Zhang, H. Ding, Yinglong Li
AZ80 Mg alloy was processed at 320℃ and 200℃ by equal channel angular pressing.At 320℃,the grain size was decreased at previous two passes and then increased in the subsequent passes.At 200℃,both the density of dislocation and twinning were increased at previous two passes with the hardness dramatically increased.After 4 passes with route Bc,the grain size was refined to 200nm in most of areas,but the hardness slightly increased due to the interaction of grain refinement strengthening and texture softening.
{"title":"The effect of temperature on microstructure and hardness of AZ80 Mg alloy during equal channel angualr pressing","authors":"Jingzhong Li, N. Zhang, H. Ding, Yinglong Li","doi":"10.3969/J.ISSN.1007-2012.2011.03.006","DOIUrl":"https://doi.org/10.3969/J.ISSN.1007-2012.2011.03.006","url":null,"abstract":"AZ80 Mg alloy was processed at 320℃ and 200℃ by equal channel angular pressing.At 320℃,the grain size was decreased at previous two passes and then increased in the subsequent passes.At 200℃,both the density of dislocation and twinning were increased at previous two passes with the hardness dramatically increased.After 4 passes with route Bc,the grain size was refined to 200nm in most of areas,but the hardness slightly increased due to the interaction of grain refinement strengthening and texture softening.","PeriodicalId":39811,"journal":{"name":"塑性工程学报","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70176476","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}
Pub Date : 2010-10-01DOI: 10.3969/J.ISSN.1007-2012.2010.05.015
Li Zhang, Li Huang, Z. Ye, Yi Lin, H. Zhao, Zheng-Dong Ma
CAE analysis methods and procedures of structural optimization for passenger car subframes were setup based on multiple load cases strength analysis methods and topology optimization technology,by which the structural stiffness,strength and lightweight performances of several car subframes were evaluated and optimized.The practical application showed that the weak positions of subframes could be predicted very accurately by using multiple load cases strength analysis method,and were consistent with experimental results.By using topology optimization method,selecting the appropriate optimization parameters,the CAE procedures are not only available for finding a 15% weight loss design proposal meeting the manufacturing requirements in this paper,are also suitable for use in the concept design for a new model subframe.Study results have important practical significance on academic value and engineering.
{"title":"Research and application of lightweight technology for passenger car subframes","authors":"Li Zhang, Li Huang, Z. Ye, Yi Lin, H. Zhao, Zheng-Dong Ma","doi":"10.3969/J.ISSN.1007-2012.2010.05.015","DOIUrl":"https://doi.org/10.3969/J.ISSN.1007-2012.2010.05.015","url":null,"abstract":"CAE analysis methods and procedures of structural optimization for passenger car subframes were setup based on multiple load cases strength analysis methods and topology optimization technology,by which the structural stiffness,strength and lightweight performances of several car subframes were evaluated and optimized.The practical application showed that the weak positions of subframes could be predicted very accurately by using multiple load cases strength analysis method,and were consistent with experimental results.By using topology optimization method,selecting the appropriate optimization parameters,the CAE procedures are not only available for finding a 15% weight loss design proposal meeting the manufacturing requirements in this paper,are also suitable for use in the concept design for a new model subframe.Study results have important practical significance on academic value and engineering.","PeriodicalId":39811,"journal":{"name":"塑性工程学报","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70176191","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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