轩福贞
从事先进过程装备设计理论和寿命可靠性技术研究,在过程装备的结构完整性原理、多材料结构的疲劳和蠕变失效机理、复杂结构的极限载荷分析、跨尺度寿命预测方法等方面有深入研究
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- 姓名:轩福贞
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学术头衔:
教育部“新世纪优秀人才支持计划”入选者, 博士生导师
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学科领域:
化工机械与设备
- 研究兴趣:从事先进过程装备设计理论和寿命可靠性技术研究,在过程装备的结构完整性原理、多材料结构的疲劳和蠕变失效机理、复杂结构的极限载荷分析、跨尺度寿命预测方法等方面有深入研究
轩福贞,男,1970年8月生,博士,华东理工大学教授、博士生导师。主要从事机械结构完整性工程与科学领域的研究,在过程装备的高温强度设计、疲劳断裂分析与安全评价方面有深入研究。2002年于华东理工大学获化工过程机械专业博士学位,毕业后留校从事科研和教学工作,2006年破格聘为博士研究生导师,同年9月破格晋升教授。现任机械与动力工程学院院长、承压系统与安全教育部重点实验室(华东理工大学)主任、化工机械研究所所长。国家自然科学基金委员会材料工程学部通讯评审专家,国家“十一五”863先进制造领域评审专家,中国机械工程学会压力容器分会常务理事、副秘书长(兼),国际压力容器技术学会会员,中国力学学会会员,中国机械工程学会失效分析专家。受聘为The Open Mechanical Engineering Journal (OME)杂志编委,Nuclear Engineering & design, Int. J. Fracture, Eng Frac Mech等国际期刊审稿人。发表SCI收录论文130余篇,申请/公开/授权国家专利56项,获得国家软件著作权13项。先后主持国家杰出青年基金、863计划、国家科技支撑计划、霍英东青年教师基金、教育部博士点基金、上海市自然科学基金、美国John Deere公司国际合作项目等20余项,参加了国家标准GB/T19624-2004《在役含缺陷压力容器安全评定》的编制及科研工作。获国家和省部级科研奖励6项,2004年入选上海高校优秀青年教师后备人选培养计划,2005年入选上海市青年科技启明星人才奖励计划,2005年获第十届霍英东教育基金会高等院校青年教师基金资助,2006年获教育部新世纪优秀人才支持计划资助,2008年上海市优秀教师,2009年获上海市曙光学者称号,2012年入选上海市领军人才计划,2013年获国家杰出青年基金资助。先后获中国机械工程学会优秀论文奖,上海市优秀博士论文奖、全国百篇优秀博士论文提名及中国石油与化学工业联合会青年科技突出贡献奖等荣誉。
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693
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成果数
12
【期刊论文】Ratchetting behavior of advanced 9-12% chromium ferrite steel under creep-fatigue loadings
轩福贞, Peng Zhao, Fu-Zhen Xuan
Mechanics of Materials,-0001,():
-1年11月30日
The ratchetting behavior of advanced 9-12% chromium ferrite steel was investigated by cyclic loading tests with various hold times and stress ratios at elevated temperature of 873 K. Particular attention was paid to the effect of hold time on the whole-life ratchetting deformation and failure mechanism. Results indicate that the total ratchetting strains under creep-fatigue loading can be decomposed into two parts, i.e., cyclic accumulated creep strain produced during the peak stress hold time ( ), cyclic accumulated inelastic strain produced during the stress change process ( ). A transition in ratchetting components and rupture behavior with the increase of hold time was observed. In the long hold time domain, a quick shakedown of ratchetting strain occurs after the very first few cycles and the rupture behavior is fully controlled by the time-dependent creep damage. In the short hold time domain, ratchetting strain increases till the specimens fails and a mixed damage mode is responsible for the failure. An attempt is made to explain the existence of these two domains in terms of the evolutions of three internal stress components (back stress, isotropic stress and viscous stress) measured at the end of the holding period.
Ratchetting, creep-fatigue loading, internal stress
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轩福贞, Yanxun Xiang, Mingxi Deng, Fu-Zhen Xuan, and Chang-Jun Liu
Journal of Applied Physics,-0001,():
-1年11月30日
An analytical model is presented for the effect of the interactions of dislocations with precipitate coherency strains on the generation of second-harmonic of Lamb waves in metallic alloys. The cumulative second-harmonic of Lamb wave propagation is shown to depend dominantly on the dislocation density, pinning dislocation length, internal stress due to the coherency strain, volume fraction of the precipitates, and the phase matching degree between the primary Lamb wave and the double frequency Lamb wave (DFLW). Experiments were carried out to introduce controlled levels of creep-induced damage to determine the nonlinear response of Lamb waves in titanium alloy Ti60 plates. A like mountain-shape change in the normalized acoustic nonlinearity of Lamb wave versus the creep loading time has been observed. Microscopic image analyses were performed to interpret the variation of the measured acoustic nonlinearity and to obtain the microstructure parameters of the Ti60 specimens with different creep damages. The analytical model was applied to these creep damaged Ti60 specimens, which revealed a good accordance with the measured results of the nonlinear Lamb waves. These results indicate that the acoustic nonlinearity of Lamb wave increases due to the rising of the precipitation volume fraction and the dislocation density in the early stage, and it decreases as a combined result of the reduction of the precipitation volume fraction and the dislocation density and the increasing mismatch of the phase velocity between the primary Lamb wave and the DFLW after a further creep loading
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【期刊论文】A review of creep analysis and design under multi-axial stress states
轩福贞, Hua-Tang Yao, Fu-Zhen Xuan∗, Zhengdong Wang, Shan-Tung Tu
Nuclear Engineering and Design 237(2007)1969-1986,-0001,():
-1年11月30日
The existence of multi-axial states of stress cannot be avoided in elevated temperature components. It is essential to understand the associated failure mechanisms and to predict the lifetime in practice. Although metal creep has been studied for about 100 years, many problems are still unsolved, in particular for those involving multi-axial stresses. In this work, a state-of-the-art review of creep analysis and engineering design is carried out, with particular emphasis on the effect of multi-axial stresses. The existing theories and creep design approaches are grouped into three categories, i.e., the classical plastic theory (CPT) based approach, the cavity growth mechanism (CGM) based approach and the continuumdamage mechanics (CDM) based approach. Following above arrangements, the constitutive equations and design criteria are addressed. In the end, challenges on the precise description of the multi-axial creep behavior and then improving the strength criteria in engineering design are presented.
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轩福贞, Fu-Zhen Xuan, Jun Si, Shan-Tung Tu
Int J Fract 153(2008)117-123 ,-0001,():
-1年11月30日
Based on the comprehensive finite element (FE) creep analyses, the influence of free surface on the time dependent fracture mechanics parameter of a crack near the free surface in plates under tension has been investigated. It is found that the time dependent fracture parameter C∗ increases as the crack tip closes to the free surface. Such an increment is related not only to the crack configurations but also to the material properties, especially the creep exponent n of power creep law. In addition, more pronounced interaction is observed between the C∗ of subsurface crack and that of a single isolated crack compared to that denoted by SIF under the linear elastic fracture condition. Under the framework of reference stress method, we also developed a closed form solution for creep interaction factor. Overall good agreement is achieved between the proposed method for the C∗ of subsurface crack and the FE results which provides us confidence in practical application.
Subsurface cracks, Creep, C∗ integral, Interaction
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55浏览
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轩福贞, Qing-Qi Chen, Fu-Zhen Xuan *, Shan-Tung Tu
Thin Solid Films 517(2009)2924-2929,-0001,():
-1年11月30日
A general theoretical model was developed to predict the creep deformation and its effect on the stress relaxation and distribution in the multilayer systems under residual stress and external bending. Based on the proposed solution, a simplified solution for the special case of one film layer on a substrate is also presented. Finite element analysis was carried out to validate the presented model. Good agreements were observed between the finite element simulation and the prediction of the proposed model. In addition, the effects of film thickness on creep strain and stress distribution, the creep effect on neural axis location in the bilayer assembly subjected to the combination of residual stress and external bending were also discussed.
Creep, Multilayer, Residual stress, Externalbending, Modeling
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【期刊论文】A numerical creep analysis on the interaction of twin semi-elliptical cracks
轩福贞, Jun Si, Fu-Zhen Xuan*, Shan-Tong Tu
International Journal of Pressure Vessels and Piping 85(2008)459-467,-0001,():
-1年11月30日
The interaction and coalescence of multiple flaws will significantly influence the service life of components. In this paper, the interaction of two identical semi-elliptical cracks in a finite thickness plate subjected to the remote tension is investigated. The results indicated that interaction of multiple cracks is different between the time-dependent fracture characterized by C*-integral and linear elastic fracture noted by SIF. The magnifying factors of creep fracture are obviously larger than that of the linear elastic fracture cases. Therefore, the current interaction and coalescence rule developed from linear elastic fracture analysis may lead to a non-conservative result when it is used in the assessment of creep crack. At the end, an empirical equation is developed based on the numerical results.
Creep crack growth, Surface flaw, C*, integral, Finite element analysis
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【期刊论文】Coupling effects of chemical stresses and external mechanical stresses on diffusion
轩福贞, Fu-Zhen Xuan, Shan-Shan Shao, ZhengdongWang and Shan-Tung Tu
J. Phys. D: Appl. Phys. 42 (2009) 015401 (8pp),-0001,():
-1年11月30日
Interaction between diffusion and stress fields has been investigated extensively in the past. However, most of the previous investigations were focused on the effect of chemical stress on diffusion due to the unbalanced mass transport. In this work, the coupling effects of external mechanical stress and chemical stress on diffusion are studied. A self-consistent diffusion equation including the chemical stress and external mechanical stress gradient is developed under the framework of the thermodynamic theory and Fick's law. For a thin plate subjected to unidirectional tensile stress fields, the external stress coupled diffusion equation is solved numerically with the help of the finite difference method for one-side and both-side charging processes. Results show that, for such two types of charging processes, the external stress gradient will accelerate the diffusion process and thus increase the value of concentration while reducing the magnitude of chemical stress when the direction of diffusion is identical to that of the stress gradient (M•D=1). In contrast, when the direction of diffusion is opposite to that of the stress gradient (M•D=-1), the external stress gradient will obstruct the process of solute penetration by decreasing the value of concentration and increasing the magnitude of chemical stress. For both-side charging process, compared with that without the coupling effect of external stress, an asymmetric distribution of concentration is produced due to the asymmetric mechanical stress field feedback to diffusion.
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轩福贞
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-1年11月30日
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49浏览
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轩福贞
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-1年11月30日
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33浏览
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【期刊论文】Limit load analysis for the piping branch junctions under in-plane momnet
轩福贞
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-1年11月30日
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