陈宜亨
主要研究方向是结构材料和功能材料的断裂损伤。
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 姓名：陈宜亨
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学科领域：
数理科学
 研究兴趣：主要研究方向是结构材料和功能材料的断裂损伤。
陈宜亨教授，1981年获西安交通大学硕士学位。1986年获西安交大工学博士学位。早在1982年已开始在国际工程计算方法刊物上发表论文。1987获德国洪堡基金资助在KL大学合作研究；1992～1993获日本资助在名古屋工业大学合作研究；1996和1999年获日本资助在九州大学合作研究，并获得九州大学工学论文博士；1999获德国DAAD资助在马德堡大学合作研究；2001年获德国MaxPlanck研究所资助合作研究；2000～2004四次获英国皇家协会资助在剑桥大学合作研究。在德、日、英等国有六年以上的科研工作经历。主要研究方向是结构材料和功能材料的断裂损伤。1994年以来，作为主持人，获四项国家自然科学基金，参加一项国家自然科学基金重大项目。在国际刊物，例如美国机械工程协会的“应用力学学报”等，发表论文100多篇，在中国科学、力学学报等刊物上发表论文30多篇，他引200多次。
在国际著名的出版社荷兰Kluwer Academic Publishers出版专著一部（2002）。在国际著名的力学界两大评述刊物:Advances in Applied Mechanics 和Applied Mechanics Reviews 上发表长篇论文各一篇（2003）。
获国家教育部中国高校自然科学一等奖一项（2000），教育部推荐国家自然科学二等奖一项（2003）。
西安交通大学建力学院院长（1995年止今）。
第九届、第十届全国人大代表。

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陈宜亨， Z.C. Ou*， Y.H. Chen
Z.C. Ou, Y.H. Chen International Journal of Engineering Science 42 (2004) 14071438，0001，（）：
1年11月30日
The primary goal of this research is to show the fundamental features of an interface crack in metal/piezoelectric bimaterials via Stroh's theory [Phil. Mag. 7 (1958) 625]. Based on the previous works [Phil. Mag. 7 (1958) 625; J. Mech. Phys. Solids 40 (1992) 739; Int. J. Fract. 119 (2003) L41; Singularities and neartip ﬁeld intensity factors of piezoelectric interface cracks, J. Mech. Phys. Solids (in press)] and by considering a metal as a special piezoelectric material withextremely small piezoelectricity and extremely large permittivity (conductor), we obtain the two dominant parameters e and j for description of interface cracktip singularity in such bimaterials. Numerical results show that almost all of such bimaterials have the feature that the ﬁrst parameter e vanishes whereas the second parameter j remains nonzero. An interface crack in these bimaterials always possesses the stress singularity r1/±k at the crack tip. From the physical point of view, this implies that an interface crack in such bimaterials shows a feature with nonoscillating ingularity, which is far apart from previous results [Prik. Mat. Mekh. 39 (1975) 145; V.Z. Parton, B.A. Kudryavtsev, Electromagnetoelasticity, Gordon and BreachSc ience Publishers, New York, 1988; J. Mech. Phys. Solids. 51 (2003) 921] and our classical understanding in dissimilar elastic or anisotropic materials [Bull. Seism. Soc. Am. 49 (1959) 119; ASME J. Appl. Mech. 32 (1965) 400]. On the other hand, there is one exceptional metal/piezoelectric bimaterial withnonz ero e and vanishing j, the oscillating stress singularity r1/2ie at the crack tip is reached in this bimaterial. Consequently, metal/piezoelectric bimaterials are categorized into two classes: one withnonzero j and vanishing e could be called as jclass metal/piezoelectric bimaterials and the other one with nonzero e and vanishing j could be termed as eclass metal/piezoelectric. Analysis of the cracktip generalized stress ﬁeld is performed. Of great signiﬁcance is that: if a purely electricinduced interface crack growthoc curs in metal/piezoelectric bimaterials, it is most likely due to the shear mode II fracture rather than the open mode I, and then a purely remote electrical loading enhances the interface crack extension in such bimaterials. Only when an external tensile loading is applied, could the mode I fracture play a dominant role.
Interface crack， Metal， Piezoelectric material， Generalized plane strain， Material mismatch， Cracktip ﬁeld

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陈宜亨， LIGUO ZHAO and YIHENG CHEN
Int. J. Engng Sci. 35 (4) 387407. 1997，0001，（）：
1年11月30日
The Jintegral analysis is performed for the plane problems of multiple subinterface microcracks near the tip of an interface macrocrack in bimaterial solids. The analysis starts from a general solution based on the "pseudotraction" method which has been addressed thoroughly in homogeneous cases. The contribution to the Jintegral induced from the subinterface microcracks is shown in a consistent relation with those induced from an interface macrocrack tip and the remote stress field. A new technique is developed to evaluate the second component (being expressed by J*2 in this paper) of the wellknown Jkvector of a subinterface crack for considering a contour enclosing the whole crack, which is necessary to evaluate the contribution to the Jintegral arising from the subinterface microcracks. The consistency of the Jintegral for numerical examples is proved, where two kinds of material combinations presented by Hutchinson et at. [ASME J. Appl. Mech., 1987, 54, 828832] are considered. Some discussion and conclusions are then given which seem very useful in the investigation of microcrack shielding problems in bimaterial cases.

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【期刊论文】ON THE CONTRIBUTION OF DISCONTINUITIES IN A NEARTIP STRESS FIELD TO THE JINTEGRAL
陈宜亨， YIHENG CHEN
Int. J. Engng Sci. 34 (7) 819829, 1996，0001，（）：
1年11月30日
The pathindependence of the Jintegral considering discontinuities (e.g. microcracks) in a neartip stress field is studied in detail. The wellknown integral defined by Rice and the related Jkvector discussed by Bergez, Cherepanov, and Herrmann and Herrmann are evaluated, respectively, along three different closed contours. The first of them is surrounding the tip of a semiinfinite crack only, the second encloses the discontinuities completely, while the third encloses both the tip and the discontinuities. It is found that there is a simple, but universal relation among three values of the Jintegral corresponding to the contributions induced from the semiinfinite crack tip, the discontinuities and the remote stress field, respectively. This means that the interaction effect between a macrocrack and discontinuities can be considered as the redistribution of the Jintegral arising from the existence of the discontinuities.

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【期刊论文】Multiple parallel cracks interaction problem in piezoelectric ceramics
陈宜亨， JianJun Han*， YiHeng Chen
International Journal of Solids and Structures 36 (1999) 33753390，0001，（）：
1年11月30日
This paper has two goals. First, we propose the 'pseudotraction electric displacement' method for solving the interaction problem of multiple parallel cracks in transversely isotropic piezoelectric ceramics. Second, we present a fundamental understanding for the role that the electric displacement loading plays in the interaction problem. Detailed comparisons between the results under the compound mechanical electric loading conditions and those derived under purely mechanical loading conditions are performed. It is shown that the mechanical fracture parameters such as the stress intensity factors are no longer independent of the electric loading as they wofiuld be in single crack problems. Quite contrary, the electric displacement loading has a signicant in uence on the stress intensity factors, the total potential energy release rate and the mechanical strain energy release rate. This important conclusion is mainly due to the interaction effect, i.e., one of the multiple cracks releases the stresses and disturbs the electric fields near the other crack. It is also found that there are some special relative locations for the multiple parallel cracks at which the electric displacement loading has no effect on the Mode I stress intensity factor. However, the mechanical strain energy release rate has no such a property.

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陈宜亨， YiHeng Chen*
Y.H. Chen International Journal of Solids and Structures 38 (2001) 31933212，0001，（）：
1年11月30日
This paper addresses and alternative description for brittle solids with strongly interacting microcracks. The basic idea starts from the Mintegral analysis customatil used in single crack problems. As an initial attempt, the discussion is limited to the infinite twodimensional cases and the microcracks are assumed to be stationary. It is proved from the globallocal contributed from the two components of the Jk vector (Knowles and Sternberg, 1972, Budiansky and Rice, 1973) and the coordinates of each microcrack center. The later is concerned not only with the crack tip SIFs, but also with the contribution arising from the tractionfree surfaces of each crak (Herrmann and Herrmann, 1981). A detailed proof for the vanishing nature of the Jk vector along a closed contour surrounding all the microcracks is presented, from which the confsion about the dependence of the M integral on the origin selection of global coordinates is clarified. Two numerical examples are shown in tables and figures tocomfirm the dervied conclusions. It is shown that the M integralis equivalent to the decrease of the total potential energy of the microcracking soilds although the strongly interacting situations are taken into account. Therefore, a simple relation between the M integral and the L integral is established under the assumption mentioned above. It is concluded that the Mintegral analysis, from the physical point of view, does play important role and provide an effective measure in evaluatin the damage level of brittle solids with strongly interacting and randomly distributed microcracks. Although only the stationary microcracks are considered in the present investigation, the derived conclusions could actually be extended to treat much more useful problems, in which the multicracks may become critical and may grow during loading histories.
Mintegral， Jk wecor， Conservation law， Microcracks

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【期刊论文】On the path dependence of the Jintegral in notch problems
陈宜亨， YiHeng Chen a， Tian Jian Lu b， *
Y.H. Chen, T.J. Lu International Journal of Solids and Structures 41 (2004) 607618，0001，（）：
1年11月30日
This study attempts to clarify the conditions under which the Jintegral is pathindependent in Uand Vshaped notch problems. The key is to determine the contribution to the Jintegral evaluated in the global coordinate system from the second component of the Jkvector evaluated in the local coordinate system along the tractionfree surfaces that form part of the integration path. It is found that the global Jintegral is pathindependent only if the projected contribution from the J2integral to J vanishes. The Jintegral for a Vshaped notch is, strictly speaking, pathdependent even under remote symmetrical loading. This is due to the fact that, unlike in the case of a lineor planecrack, the value of the Jintegral calculated along a closed contour surrounding the Vshaped notch is dependent on the selection of the starting and ending points on the notch surface. In other words, the tractionfree surface of the Vshaped notch does contribute to the Jintegral due to the nonzero projected values induced from the J2integral. For a Ushaped notch, the pathindependence of the Jintegral is established if the integration path completely encloses the notch root. This is because both the upper and lower notch surfaces of the Ushaped notch are parallel to the geometric symmetrical line (the x1axis) and hence the projected values from the J2integral vanish. Furthermore, it is found that the small arc at the root of the notch (whether Uor Vshaped) also contributes to the Jintegral even if the remote loading is symmetrical. These conclusions are derived by detailed analytical manipulations and by numerical examples; the analytical solution obtained by Lazzarin and Tovo [Int. J. Fracture 78 (1996) 3] and Lazzarin et al. [Int. J. Fracture 91 (1998) 269] for stress ﬁeld in the vicinity of a notch root in an inﬁnite elastic plane is used to calculate the contribution induced from the arc with different radii. Some useful results for studying the fracture and fatigue of notches are discussed.
Jintegral， Pathindependence， Notch and crack， Analytical modeling， Numerical simulation

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陈宜亨， YiHeng Chen*， WenYe Tian
Y.H. Chen, W.Y. Tian International Journal of Solids and Structures 37 (2000) 77317742，0001，（）：
1年11月30日
Based on the investigation performed in Part I of this series, numerical results for the interaction between a semiinfinite interface crack and multiple subinterface matrix microcracks in three kinds of material combinations are given in Part II. The major interaction behaviors are discussed in detail. Special attention is focused on the influences of the different material combinations, the Tstress, the orientation angles, and the location angles of the microcracks on the local stress intensity factor at the interface crack tip. In addition, the variable tendencies of the interaction effect induced from change of the distance between the interface crack tip and the centers of the microcracks are studied. It is concluded that the different material combinations introduced in this paper have little influence on the variable tendencies of the effect, but have significant influence on the effect in magnitude. Detailed comparisons of the results with those in a homogeneous orthotropic material show that the dissimilar materials shift the maximum amplification angle, the maximum shielding angle, the neutral shielding angle, and the neutral Tstress angle, respectively.
Interaction behavior， TStress， Stress intensity factor， Material combination

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陈宜亨， WenYe Tian*， YiHeng Chen
W.Y. Tian, Y.H. Chen│International Journal of Solids and Structures 37 (2000) 77437757，0001，（）：
1年11月30日
A semiinfinite interface macrocrack interacting with multiple oriented subinterface microcracks in the process zone near the macrocrack tip in metal/piezoelectric bimaterials is studied. After deriving the elementary solutions for a semiin
Interaction， Interface macrocrack， Subinterface microcrack， Metal/， piezoelectric bimaterials

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陈宜亨， WenYe Tian， YiHeng Chen*
W.Y. Tian, Y.H. Chen│International Journal of Solids and Structures 37 (2000) 77177730，0001，（）：
1年11月30日
The Jintegral analysis is presented for the interaction problem between a semiinfinite interface crack and subinterface matrix microcracks in dissimilar anisotropic materials. After deriving the fundamental solutions for an interface crack subjected to different loads and the fundamental solutions for an edge dislocation beneath the interface, the interaction problem is deduced to a system of singular integral equations with the aid of a superimposing technique. The integral equations are then solved numerically and a conservation law among three values of the Jintegral is presented, which are induced from the interface crack tip, the microcracks and the remote field, respectively. The conservation law not only provides a necessary condition to con
Semiinfinite interface crack， Subinterface matrix microcrack， Dissimilar anisotropic materials

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