许金泉
1. 界面力学;2. 疲劳寿命评估;3. 断裂与破坏。
个性化签名
- 姓名:许金泉
- 目前身份:
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师, 优秀教师/优秀教育工作者
- 职称:-
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学科领域:
水文学
- 研究兴趣:1. 界面力学;2. 疲劳寿命评估;3. 断裂与破坏。
许金泉,男,浙江绍兴人,1963年生,现为上海交通大学工程力学系教授、博导。1983年毕业于浙江大学,同年任教于华东石油学院,1986年由国家教委公派,赴日本东京大学攻读学位。92年获得博士学位后,任东京大学生产技术研究所研究员。94年回到浙江大学任副教授。95年晋升教授,96年被批准具有博导资格。99年受聘为日本国立长冈技术科学大学副教授,2002年回到上海交通大学工作,现为上海交大固体力学学科带头人,固体力学学报编委,兼任华东基础力学与强度协会副理事长。主要研究方向:1. 界面力学:结合材料界面的力学性能,界面破坏的定量评价,结合材料强度评价与界面形状及结合强度的优化,涂层材料(coating)力学性能评价2. 疲劳寿命评估:损伤与疲劳,等寿命设计,剩余寿命评估,微动疲劳。3. 断裂与破坏:结构强度优化,断裂路径预测,新材料的强度评价方法承担过的主要科研工作国家自然科学基金课题三项。 国家教委优秀年轻教师基金一项。教育部博士点基金一项,日本文部省科研基金(即日本的国家自然科学基金) 一项。关于海洋平台强度与寿命的横向课题两项。主要研究成果通过系统和长期的研究工作,建立了界面力学的理论体系。在界面力学及相关方向上,发表论文100余篇,出版专著2部。94年曾获日本机械学会研究奖(个人奖)。被多次应邀到日本著名大学作界面力学方面的专题报告。
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3883
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成果阅读
412
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成果数
10
【期刊论文】Stress Field near the Contact Edge in Fretting Fatigue Tests*
许金泉, Jin-Quan XU** and Yoshiharu MUTOH***
,-0001,():
-1年11月30日
The stress field near a contact edge in fretting fatigue tests depends on the deformation type at the contact edge. During one cycle of loading in a fretting fatigue test, nine types of the stress field, among which six are independent, can possibly exist. In this study, the detailed forms of the singular stress variation range near the contact edge, i.e., the differences of singular stress fields corresponding to the maximum and the minimum loads, have been theoretically analyzed. The theoretical results were compared with numerical results obtained by the boundary element analysis. It was found that the singular order of the stress field obtained by the theoretical solutiong agrees well with the numerical results. It should be noted that the stress variation range presents different singular behavior for different deformation types. Therefore, the fatigue strength evaluation should be carried out in a manner corresponding to the stress variation range type. It was found that a fretting fatigue crack was initiated in the maximum shear stress range direction, and then kinked into the maximum tangential stress range direction following the initiation stage of the crack.
Fretting Fatigue,, Elasticity,, Crack Initiation,, Boundary Element Method,, Contact Edge,, Stress Singularity,, Relative Slip
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【期刊论文】Interface Fatigue Crack Propagation in Ceramic Thermal Barrier Coatings*
许金泉, Yoshiharu MUTOH**, Jin-Quan XU**, Yukio MIYASHITA**, Gomez G. BERNARDO*** and Masashi TAKAHASHI****
,-0001,():
-1年11月30日
der mixed mode condition, and its growth behavior can be well characterized by using the parameter △Ki=△, which corresponds to the energy release rate. It is also found that the crack propagation resistance decreases with increasing of the porosity of the top ceramic coating. The crack propagation resistance at elevated temperature becomes lower compared to that at room temperature.
Fatigue,, Crack Propagation,, Interface Crack,, Ceramic Coating,, Stress Intensity Factor
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许金泉, Jin-Quan XU**, Lie-Dong FU*** and Yoshiharu Mtuoh
,-0001,():
-1年11月30日
A theoretical method for estimating the elastic-plastic stress singularity at the interface edge of bonded power-law materials is proposed, based on the iterative approach developed in this study, It is found than the elastic-plastic stress singularity depends on the bonding angle and the larger hardening exponent the stress singularity becomes. Moreover, the elastic plastic stress singularity disappears when the bonding angle is smaller than 45
Elasto-Plasticity,, Adhesive Joint,, Interface Edge,, Stress Singularity,, Power Law Hardening,, J Intergral,, Boundary Element Method,, Iterative Method
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许金泉, Yiquan Li a, *, Jin-Quan Xu b, Liedong Fu c
International Journal of Solids and Structures 41(2004)7075-7089,-0001,():
-1年11月30日
The problem studied in this paper is that of a coated semi-infinite plane subjected to a concentrated force in the upper thin layer (or film). The elastic properties of the coating material are different from those of the substrate, and a perfect bond is assumed between the two materials. The exact solutions of stress functions in a series form are obtained by the method of image. The terms in series form of the stress functions correspond to the image points from the lower order to the higher. The recurrence relations of the stress functions are given, i.e., the stress functions corresponding to the higher order image points are determined by the lower ones. Hence, from the original stress functions for an infinite plane subjected to a concentrated force, the explicit formulas of all terms of the stress function series can be derived. Also, through comparisons between the theoretical results and the numerical results by FEM, it is verified that the convergence rate of the solutions is very rapid, In most practical cases only the first several image points are sufficient to ensure the accuracy of the solution.
Image point method, Stress funcion, Concentrned force, Fundamental solutin\, ion, Dissimilar material, Film
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【期刊论文】Fracture mechanics approach to fretting fatigue and problems to be solved
许金泉, Yoshiharu Mutoh*, Jin-Quan Xu
Tribology International 36(2003)99-107,-0001,():
-1年11月30日
A large number of research works have been devoted to fretting fatigue from both mechanical and metallurgical viewpoints. In the present paper, fracture mechanical approaches for evaluating fretting fatigue life and strength have been briefly reviewed. Furthermore, a new approach based on a singular stress field near the contact edge and on fracture mechanics has been proposed. The directions of crack initiation and propagation as well as fretting fatigue life, which have coincided with the experimental results, could be estimated according to the new approach, in which singular stress near the contact edge and mixed mode crack growth have been taken into consideration. In the application of the new method to predict the fretting fatigue behavior, there are still several problems to be clarified, which have also been discussed in detail.
Fretting fatigue, Fracture mechanics, Numerical analysis, Stress singularity, Fatigue life prediction
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许金泉, Jin-Quan XU**, and Yoshiharu MUTOH**
Series A. Vol. 44. No.4, 2001,-0001,():
-1年11月30日
Theoretical analysis of the singular field near an fnterface edge of bonded axisym-metric transversely isotropic piezoelectric materiais has been carried out. The eigene. Quation determining the singular order, and the stress and electric displacement fields are deduced in details. The results show that the singular ordcr depends on the geometry shape of the interface edge and the material combination. It is found that the piezoelectric and dielectric constants have no effect on the singularity under the torsion loading condition, but have a complicated effect under axisymmetric deformation condition. It is of interest that the electric displacement also behaves as singular, and its magnitude can be described by the same parameter as the intensity coefficient of the stress field. The analysis of bonded axisymmetric piezo/isotropic materials has also been carried out.
Adhesive Joint., Stress Concentration,, Anisotropy,, Elasticity,, Piezoelectric,, Axisymmetry,, Interface Edge,, Stress Singularity
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【期刊论文】Stress intensity factors of a surface crack near an interface end
许金泉, JIN-QUAN XU, *, XIAO-GUI WANG and YOSHIHARU MUTOH
International Journal of Fracture 111: 251-264, 2001.,-0001,():
-1年11月30日
Due to the singular behavior of the stress field near the interface edge of bonded dissimilar materials, fracture generally initiates near the interface edge, or just from the interface edge point. In this paper, an edge crack near the interface, which can be considered as being induced by the edge singularity and satisfying two conditions, is analyzed theoretically, based on the singular stress field near the interface edge and the superposition principle. It is found that the stress intensity factor can be expressed by the stress intensity coefficient of the edge singular stress field, the crack length, the distance between the interface and the crack, as well as the material combination. Boundary element method analysis is also carried out. It is found that the theoretical result conincides well with the numerical result when the crack length is small, Therefore, the theoretical representation obtained by this study can be used to simply evaluate the stress intensity factor of an edge singularity induced crack for this case. However, when the crack length becomes larger than a certain value, a significant difference appears, especially for the case with large edge singularity.
Bi-material,, edge singularity,, interface end,, stress intensity factors,, superposition principle,, surface crack.,
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许金泉, Jin-Quan Xua, *, Yi-Hua Liub, Xiao-Gui Wanga
Engineering Fracture Mechanics 36(1999)775-790,-0001,():
-1年11月30日
This paper proposed numerical methods to determine the multiple stress singularities (including the oscillatory stress singularities) and the related stress intensity coefficients, by the use of common numerical solutions (stresses or displacements) obtained by an ordinary numerical tool such as finite element method (FEM) or boundary element method (BEM). To verify the efficiency of the present methods, two models of bonded dissimilar materials under the plane strain state are analyzed by BEM, and the orders of the stress singularities and the related stress intensity coefficients are examined numerically. The results show that all the orders of the stress singularities at an interface edge can be determined precisely by the present method, and the related stress intensity coefficients can be determined by the extrapolation method with a very good linearity. It is found that the methods presented in this paper are very simple and efficient. Moreover, they can be easily extended to any singular problem.
Multiple stress singularities, Stress intensity coefficients, Common numerical solutions, Extrapolation Method, Bonded dissimilar materials
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【期刊论文】Analytical solution for interface stresses due to concentrated surface force
许金泉, Jin-Quan Xua, *, Yoshiharu Mutohb
International Journal of Mechanical Sciences 45(2003)1877-1892,-0001,():
-1年11月30日
The two-dimensional analytical solution for interface stresses due to concentrated surface force has been dedduced, by introducing infinite mirror points which are the images of the load point reflected by the interface and the free surface, and adopting the interchange law of differentiation. The analytical solution can be represented in terms of the summation of the "partial" Goursat's complex stress functions defined in the local coordinate systems with their origins placed at each of the mirror points. It is found that the "partial" stress functions corresponding to a higher order mirror point can be determined from those to the lower one. It is also found that the contribution of the "partial" stress functions to the stress field decreases with the increase of the corresponding mirror point order, therefore, only considering the stress functions corresponding to the first several order mirror point oredr, therefore, only considering the stress functions corresponding to the first several order mirror points can give the accurate enough solution, Numerical examination by the use of boundary element method has also been carried out to verify the theoretical development.
Elasticity, Stress function, Coating, Interface, Fundamental solution
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【期刊论文】A Normal Force on the Free Surface of a Coated Material
许金泉, JIN-QUAN XU and YOSHIHARU MUTOH
Journal of Elasticity 73: 147-164, 2003,-0001,():
-1年11月30日
The three-dimensional theoretical solution of a concentrated normal force acting on the free surface of a coated material has been deduced by applying the reflection method. It is found that all stress functions defined in the local coordinate systems with their origins placed at each mirror point can be deduced from the fundamental solution of a concentrated normal force acting on the free surface of a semi-infinite homogeneous medium. The structure of the elastic solution has been illustrated by numerical analysis. It is found that only the stress functions corresponding to the first few mirror points are influential It is also found that the effect of material combination on the stresst field shall be described by three parameters, the two Dundurs' parameters and one additional parameter.
surface-treated material,, interface,, spatial axisymmetry,, fundamental solution.,
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