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Interface fracture toughness and fracture mechanisms of thermal barrier coatings investigated by indentation test and acoustic emission technique 被引量:1
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作者 Han Jiceng Guo Ping +2 位作者 Luo Jianxia Zhang Zhichao Li Qiang 《China Welding》 EI CAS 2016年第3期63-70,共8页
Interface fracture toughness and fracture mechanisms of plasma-/sprayed thermal barrier coatings (TBCs) were investigated by interfacial indentation test ( HT) in combination with acoustic emission ( AE ) measur... Interface fracture toughness and fracture mechanisms of plasma-/sprayed thermal barrier coatings (TBCs) were investigated by interfacial indentation test ( HT) in combination with acoustic emission ( AE ) measurement. Critical load and AE energy were employed to calculate interface fracture toughness. The critical point at which crack appears at the interface was determined by the HT. AE signals produced during total indentation test not only are used to investigate the interface cracking behavior by Fast Fourier Transform (FFT) and wavelet transforms but also supply the mechanical information. The result shows that the AE signals associated with coating plastic deformation during indentation are of a more continuous type with a lower characteristic frequency content (30 -60 kHz) , whereas the instantaneous relaxation associated with interface crack initiation produces burst type AE signals with a characteristic frequency in the range 70 - 200 kHz. The AE signals energy is concentrated on different scales for the coating plastic deformation, interface crack initiation and interface crack propagation. Interface fracture toughness calculated by AE energy was 1. 19 MPam1/2 close to 1.58 MPam1/2 calculated by critical load. It indicates that the acoustic emission energy is suitable to reflect the interface fracture toughness. 展开更多
关键词 thermal barrier coating acoustic emission interface indentation test interface fracture toughness
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SIF-based fracture criterion for interface cracks 被引量:3
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作者 Xing Ji 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2016年第3期491-496,共6页
The complex stress intensity factor K governing the stress field of an interface crack tip may be split into two parts, i.e.,■ and s^(-iε), so that K = ■ s^(-iε), s is a characteristic length and ε is the osc... The complex stress intensity factor K governing the stress field of an interface crack tip may be split into two parts, i.e.,■ and s^(-iε), so that K = ■ s^(-iε), s is a characteristic length and ε is the oscillatory index. ■ has the same dimension as the classical stress intensity factor and characterizes the interface crack tip field. That means a criterion for interface cracks may be formulated directly with■, as Irwin(ASME J. Appl. Mech. 24:361–364, 1957) did in 1957 for the classical fracture mechanics. Then, for an interface crack,it is demonstrated that the quasi Mode I and Mode II tip fields can be defined and distinguished from the coupled mode tip fields. Built upon SIF-based fracture criteria for quasi Mode I and Mode II, the stress intensity factor(SIF)-based fracture criterion for mixed mode interface cracks is proposed and validated against existing experimental results. 展开更多
关键词 Interface crack Stress singularity fracture criterion Stress intensity factor
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Fracture analysis of magnetoelectroelastic bimaterials with imperfect interfaces by symplectic expansion
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作者 Xinsheng XU Zhenzhen TONG +3 位作者 Dalun RONG Xianhe CHENG Chenghui XU Zhenhuan ZHOU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2017年第8期1043-1058,共16页
A Hamiltonian-based analytical method is used to study the mode Ⅲ interface cracks in magnetoelectroelastic bimaterials with an imperfect interface. By introducing an unknown vector, the governing equations are refor... A Hamiltonian-based analytical method is used to study the mode Ⅲ interface cracks in magnetoelectroelastic bimaterials with an imperfect interface. By introducing an unknown vector, the governing equations are reformulated in sets of first-order ordinary differential equations. Using separation of variables, eigensolutions in the symplectic space are obtained. An exact solution of the unknown vector is obtained and expressed in terms of symplectic eigensolutions. Singularities of mechanical, electric, and magnetic fields are evaluated with the generalized intensity factors. Comparisons are made to verify accuracy and stability of the proposed method. Numerical examples including mixed boundary conditions are given. 展开更多
关键词 symplectic fracture imperfect Hamiltonian ordinary singularity interfaces exact brittle verify
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ANTIPLANE PROBLEMS OF PERIODICAL RIGID LINE INCLUSIONS BETWEEN DISSIMILAR ANISOTROPIC MATERIALS 被引量:1
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作者 LIU You-wen(刘又文) 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2001年第10期1149-1154,共6页
The antiplane shear problems of periodical rigid line inclusions between dissimilar anisotropic materials are dealt with. By using the complex variable method, the closed form solutions are obtained. The stress distri... The antiplane shear problems of periodical rigid line inclusions between dissimilar anisotropic materials are dealt with. By using the complex variable method, the closed form solutions are obtained. The stress distribution in the immediate vicinity of the rigid line is examined. The corresponding formulation between dissimilar isotropic materials and in homogeneous anisotropic medium can be derived from the special cases of those in the present paper, and the limit conditions are in agreement with the previously known results. 展开更多
关键词 anisotropic materials interface fracture periodical rigid line inclusions antiplane shear
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Interfacial Characterization and Mechanical Property of Ti/Cu Clad Sheet Produced by Explosive Welding and Annealing 被引量:7
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作者 祖国胤 LI Xiaobing +1 位作者 ZHANG Jinghua ZHANG Hao 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第6期1198-1203,共6页
It was aim to investigate the interfacial microstructure and shear performance of Ti/Cu clad sheet produced by explosive welding and annealing. The experimental results demonstrate that the alternate distribution of i... It was aim to investigate the interfacial microstructure and shear performance of Ti/Cu clad sheet produced by explosive welding and annealing. The experimental results demonstrate that the alternate distribution of interfacial collision and vortex of flyer layer forms in the interface a few of solidification structure. TEM confirms that the interfacial interlayer contains obvious lattice distortion structure and intermetallic compounds. It interprets the explosive welding as the interfacial deformation and thermal diffusion process between dissimilar metals. The interfacial shear strength is very close to the Cu matrix strength, which is determined by the mixture of the mechanical bonding and metallurgical bonding. Several cracks exist on the shear fracture owing to the intermetallic compound in the interfacial solidifi cation structure and also the probable welding inclusion. 展开更多
关键词 explosive welding interface TEM intermetallic compound fracture
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Influence of construction interfaces on dynamic characteristics of roller compacted concrete dams 被引量:3
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作者 GU Chong-shi WANG Shao-wei BAO Teng-fei 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第4期1521-1535,共15页
To study the influence of construction interfaces on dynamic characteristics of roller compacted concrete dams(RCCDs),mechanical properties of construction interfaces are firstly analyzed. Then, the viscous-spring art... To study the influence of construction interfaces on dynamic characteristics of roller compacted concrete dams(RCCDs),mechanical properties of construction interfaces are firstly analyzed. Then, the viscous-spring artificial boundary(VSAB) is adopted to simulate the radiation damping of their infinite foundations, and based on the Marc software, a simplified seismic motion input method is presented by the equivalent nodal loads. Finally, based on the practical engineering of a RCC gravity dam, effects of radiation damping and construction interfaces on the dynamic characteristics of dams are investigated in detail. Analysis results show that dynamic response of the RCC gravity dam significantly reduces about 25% when the radiation damping of infinite foundation is considered. Hot interfaces and the normal cold interfaces have little influence on the dynamic response of the RCC gravity dam.However, nonlinear fracture along the cold interfaces at the dam heel will occur under the designed earthquake if the cold interfaces are combined poorly. Therefore, to avoid the fractures along the construction interfaces under the potential super earthquakes,combination quality of the RCC layers should be significantly ensured. 展开更多
关键词 roller compacted concrete dam construction interface nonlinear fracture radiation damping viscous-spring artificial boundary dynamic response
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Tensile properties of phase interfaces in Mg Li alloy: A first principles study
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作者 张彩丽 韩培德 +3 位作者 王小宏 张竹霞 王丽平 许慧侠 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第12期386-388,共3页
Employing density functional theory, we study the tensile and fracture processes of the phase interfaces in Mg–Li binary alloy. The simulation presents the strain–stress relationships, the ideal tensile strengths, a... Employing density functional theory, we study the tensile and fracture processes of the phase interfaces in Mg–Li binary alloy. The simulation presents the strain–stress relationships, the ideal tensile strengths, and the fracture processes of three phase interfaces. The results show that the α/α and α/β interfaces have larger tensile strength than that of β/β interface. The fractures of both α/α and β/β interfaces are ductile fractures, while the α/β fractures abruptly._Further analyses show that the fracture of the α/β occurs at the interface. 展开更多
关键词 density functional theory interface fracture magnesium
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