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Digital high-efficiency print forming method and device for multi-material casting molds
Zhongde SHAN, Zhi GUO, Dong DU, Feng LIU, Wenjiang LI
《机械工程前沿(英文)》 2020年 第15卷 第2期 页码 328-337 doi: 10.1007/s11465-019-0574-6
关键词: multi-material casting mold 3D printing efficient print forming method
Finite element simulations of sheet metal forming under complex strain paths
CHEN Wei, YANG Jichang, WU Xiaofeng, LU Dun, GUO Weigang
《机械工程前沿(英文)》 2007年 第2卷 第4期 页码 399-403 doi: 10.1007/s11465-007-0069-8
FEM-based strain analysis study for multilayer sheet forming process
Rongjing ZHANG,Lihui LANG,Rizwan ZAFAR
《机械工程前沿(英文)》 2015年 第10卷 第4期 页码 373-379 doi: 10.1007/s11465-015-0371-9
Fiber metal laminates have many advantages over traditional laminates (e.g., any type of fiber and resin material can be placed anywhere between the metallic layers without risk of failure of the composite fabric sheets). Furthermore, the process requirements to strictly control the temperature and punch force in fiber metal laminates are also less stringent than those in traditional laminates. To further explore the novel method, this study conducts a finite element method-based (FEM-based) strain analysis on multilayer blanks by using the 3A method. Different forming modes such as wrinkling and fracture are discussed by using experimental and numerical studies. Hydroforming is used for multilayer forming. The Barlat 2000 yield criteria and DYNAFORM/LS-DYNA are used for the simulations. Optimal process parameters are determined on the basis of fixed die-binder gap and variable cavity pressure. The results of this study will enhance the knowledge on the mechanics of multilayer structures formed by using the 3A method and expand its commercial applications.
关键词: finite element method (FEM) strain analysis multilayer sheet forming
Formation mechanism and modeling of surface waviness in incremental sheet forming
《机械工程前沿(英文)》 2022年 第17卷 第2期 doi: 10.1007/s11465-022-0679-1
关键词: surface waviness incremental sheet forming numerical simulation formation mechanism deformation history
Hybrid forming mechanism of patternless casting and laser cladding
Zhongde SHAN, Fuzhen SUN, Yang LIU
《机械工程前沿(英文)》 2019年 第14卷 第4期 页码 393-401 doi: 10.1007/s11465-019-0550-1
关键词: patternless casting laser cladding hybrid forming rapid tooling
Highlight yield forming and innovative technologies in tropical crops
Wenquan WANG
《农业科学与工程前沿(英文)》 2016年 第3卷 第4期 页码 283-284 doi: 10.15302/J-FASE-2016128
Properties and effect of forming sewage sludge into lightweight ceramics
Min YUE, Qinyan YUE, Yuanfeng QI, Baoyu GAO, Hui YU
《环境科学与工程前沿(英文)》 2012年 第6卷 第1期 页码 117-124 doi: 10.1007/s11783-010-0220-3
Transient performance comparison of grid-forming converters with different FRT control strategies
《能源前沿(英文)》 2023年 第17卷 第2期 页码 239-250 doi: 10.1007/s11708-022-0856-2
关键词: grid-forming converters (GFMs) fault ride through (FRT) transient stability transient inrush current transient modeling
复杂曲面薄壁构件流体压力成形理论与技术研究进展 Review
苑世剑
《工程(英文)》 2021年 第7卷 第3期 页码 358-366 doi: 10.1016/j.eng.2020.08.014
面向航空航天、汽车和高速列车等工业领域迫切需求的管、板和壳三类典型结构以及难变形材料构件,新一代流体压力成形技术得到迅速发展。本文系统介绍了管类构件低载荷液压成形、板类构件双向加压成形、椭球壳体无模液压成形和难变形材料双调热介质成形理论与工艺的最新研究进展,重点阐述了变形行为、应力调控、缺陷控制和典型应用。此外,本文还展望了流体压力成形技术的未来发展方向,包括超大尺度非均质构件超低载荷成形、金属间化合物和高熵合金构件精密成形、智能化流体压力成形工艺与装备,以及非均质强各向异性薄壳的精确有限元仿真。
徐祖耀
《中国工程科学》 2004年 第6卷 第1期 页码 16-21
材料塑性成形与热处理一体化工程的理论基础,主要为应力—相变—形变间冶金交互作用和力学交互作用的机制、建模以及组织与性能变化的模拟。以钢为例,介绍了应力下铁素体、珠光体相变的文献工作,并提出0.38C-Cr-Mo钢在应力下铁素体形成和珠光体相变的动力学模型以及组织变化的计算机模拟;讨论了Scheil相加性原则的不足及其修正途径;略述应力对钢中贝氏体相变及马氏体相变的影响;简介相场理论及其应用。对材料在应力下相变理论、建模与组织模拟的后续研究工作提出了展望。
周建忠,张兴权,王广龙,杨超君,张永康
《中国工程科学》 2005年 第7卷 第11期 页码 94-97
激光喷丸塑性成形金属板料是从激光强化发展起来的新技术。当激光诱导冲击波的峰值超过材料的 动态屈服极限时,板料冲击区的表层发生微观塑性变形,导致了板料厚度方向上不均勻应力分布,使板料发生 宏观变形。不同的激光脉冲参数在板料内部产生不同的残余应力,不同的残余应力使板料发生不同的变形,通 过控制喷丸的工艺参数来控制板料内部应力场的精确分布,就可实现板料的精确变形。其显著特点是成形精确, 且表层留有有益的残余压应力。
Experimental research on ductile fracture criterion in metal forming
Song YU, Weiming FENG
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 308-311 doi: 10.1007/s11465-011-0233-z
Ductile fracture criterion is key limitation parameter in material forming. Accuracy predicting surface and internal failure in plastic deformation process affects on the technology design of workpiece and die greatly. Tension, compression, torsion and shearing test on 45# steel are utilized for providing the experimental values of the critical values at fracture, and 11 widely used ductile fracture criterion are selected to simulate the physical experiments and their relative accuracy for predicting and quantifying fracture initiation sites are investigated. The comparing results show that metal forming process under high triaxiality can be estimated successively using both Normalized Cockcroft-latham and the Brozzo ductile fracture criteria, but the Ayada and general Rice-Tracey model work very well for the low triaxiality cases.
关键词: ductile fracture criteria metal forming process material experiment stress triaxiality
Ke WEI, Xiaoguang FAN, Mei ZHAN, Miao MENG
《机械工程前沿(英文)》 2018年 第13卷 第3期 页码 376-384 doi: 10.1007/s11465-018-0500-3
Billet optimization can greatly improve the forming quality of the transitional region in the isothermal local loading forming (ILLF) of large-scale Ti-alloy rib-web components. However, the final quality of the transitional region may be deteriorated by uncontrollable factors, such as the manufacturing tolerance of the preforming billet, fluctuation of the stroke length, and friction factor. Thus, a dual-response surface method (RSM)-based robust optimization of the billet was proposed to address the uncontrollable factors in transitional region of the ILLF. Given that the die underfilling and folding defect are two key factors that influence the forming quality of the transitional region, minimizing the mean and standard deviation of the die underfilling rate and avoiding folding defect were defined as the objective function and constraint condition in robust optimization. Then, the cross array design was constructed, a dual-RSM model was established for the mean and standard deviation of the die underfilling rate by considering the size parameters of the billet and uncontrollable factors. Subsequently, an optimum solution was derived to achieve the robust optimization of the billet. A case study on robust optimization was conducted. Good results were attained for improving the die filling and avoiding folding defect, suggesting that the robust optimization of the billet in the transitional region of the ILLF was efficient and reliable.
关键词: isothermal local loading forming rib-web component transitional region robust optimization dual response surface method
蔡安辉,潘冶,孙国雄,阮许平
《中国工程科学》 2004年 第6卷 第1期 页码 68-73
快速判定大块金属玻璃(BMG)的玻璃形成能力(GFA)是开发新型BMG的关键。基于加和性原则,用动力学理论解释了约化玻璃转变温度Trg作为合金玻璃形成能力的可行性和局限性,为制备非晶合金提供了理论依据,合金能形成BMG的最低Trg为0.4066,同时找到了玻璃形成能力最佳的两个理论约化玻璃温度,即 Trg=1和Trg=0;提出了判定GFA大小及其稳定性的两个新的参量摩尔熔化热ΔHmg和稳定性CPS,并用它计算了BMG合金系的GFA大小及其稳定性,BMG的GFA大小顺序与井上明久(Inoue)的排列顺序吻合较好。同时,按照BMG合金Zmax和Rc的平均变化对其进行了检验,两者均吻合很好。ΔHmg的大小是一种快速评价BMG的GFA能力及其稳定性的好方法。
标题 作者 时间 类型 操作
Digital high-efficiency print forming method and device for multi-material casting molds
Zhongde SHAN, Zhi GUO, Dong DU, Feng LIU, Wenjiang LI
期刊论文
Finite element simulations of sheet metal forming under complex strain paths
CHEN Wei, YANG Jichang, WU Xiaofeng, LU Dun, GUO Weigang
期刊论文
FEM-based strain analysis study for multilayer sheet forming process
Rongjing ZHANG,Lihui LANG,Rizwan ZAFAR
期刊论文
Hybrid forming mechanism of patternless casting and laser cladding
Zhongde SHAN, Fuzhen SUN, Yang LIU
期刊论文
Properties and effect of forming sewage sludge into lightweight ceramics
Min YUE, Qinyan YUE, Yuanfeng QI, Baoyu GAO, Hui YU
期刊论文
Transient performance comparison of grid-forming converters with different FRT control strategies
期刊论文
isothermal local loading transitional region of a Ti-alloy rib-web component based on dual-response surface method
Ke WEI, Xiaoguang FAN, Mei ZHAN, Miao MENG
期刊论文