• 제목/요약/키워드: Dynamic Interface Crack

검색결과 31건 처리시간 0.023초

Dynamic Interface Crack Propagating Along a Line Between Two Holes

  • Lee, Ouk-Sub;Park, Jae-Chul;Yin, Hai-Long;Byun, Kwi-Hwan
    • Journal of Mechanical Science and Technology
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    • 제15권2호
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    • pp.172-179
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    • 2001
  • The effects of the interface and two holes located near the crack path in the hybrid specimen on the dynamic crack propagation behavior have been investigated using dynamic photoelasticity with the aid of Cranz-Shardin type high speed camera system. The dynamic stress field around the dynamically propagating interface crack tip in the three point bending specimens under a dynamic load applied by a hammer dropped from 0.6m high without initial velocity are recorded. The complex stress intensity factors for the dynamically propagating interface crack are extracted by using a overdeterministic least square method. Theoretical dynamic interface isochromatic fringe loops generated by using the numerically determined complex stress intensity factors are compared with the experimental results. Furthermore, the influence of the hole to the dynamic interface crack velocities has been investigated experimentally.

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초기 혼합모드 동적 하중을 받는 경사계면균열의 동적 전파거동 (Dynamic Slant Interface Crack Propagation Behavior under Initial Impact Loading)

  • 이억섭;박재철;윤해룡
    • 한국정밀공학회지
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    • 제18권2호
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    • pp.146-151
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    • 2001
  • The effects of slant interface in the hybrid specimen on the dynamic crack propagation behavior have been investigated using dynamic photoelasticity. The dynamic photoelasticity with the aid of Cranz-Shardin type high speed camera system is utilized to record the dynamic stress field around the dynamically propagating inclined interface crack tip in the three point bending specimens. The dynamic load is applied by a hammer dropped from 0.08m high without initial velocity. The dynamic crack propagation velocities and dynamic stresses field around the interface crack tips are investigated. Theoretical dynamic isochromatic fringe loops are compared with the experimental reults. It is interesting to note that the crack propagating velocity becomes comparable to the Rayleigh wave speed of the soft material of a specimen when slant angle decreases.

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등방성체와 직교이방성체의 접합계면네 내재된 동적모드 III 균열의 등속전파 (Dynamic Mode III Crack Propagated with Constant Velocity at Interface Between Isotropic and Orthotropic Material)

  • 이광호;황재석;유재용
    • 대한기계학회논문집A
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    • 제20권12호
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    • pp.3828-3837
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    • 1996
  • The dynamic problems of interface crack propagated with constant velocity along the interface of bimateraial composed of isotropic and orthotropicmaterial under antiplane loading condition are studied in this paper. The general dynamic stress fields and displacement fields of mode III are derived when interface crack between isotropic and orthotropic material is propagating with constant velocity. The general dynamic stress fields and displacement fields in isotropic material. Finally, the characteristics of interface crack propagation are studied with various properties of isotropic and orthotropic material and crack propagarion velocities.

계면에 존재하는 결함의 강성도가 동적 계면균열전파에 미치는 영향 (Effect of the Stiffness of Ingerface Defect on Dynamic Interface Crack propagation)

  • 이억섭;윤해룡;황시원
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2001년도 춘계학술대회 논문집
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    • pp.671-674
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    • 2001
  • The dynamic photoelasticity with the aid of Cranz-Shardin type high speed camera system is utilized to record the dynamically propagating behavior of the interface crack. This paper investigates the effects of the stiffness of interface defect(exist along the path of the crack propagation) on the dynamic interface crack propagation behavior by comparing the experimental isochromatic fringes to the theoretical stress fields.

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계면에 존재하는 결함의 모양이 동적 계면균열전파에 미치는 영향 (Effect of Interface Hole Shape on Dynamic Interface Crack propagation)

  • 이억섭;윤해룡;조운기;황시원
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2000년도 추계학술대회 논문집
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    • pp.429-432
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    • 2000
  • The dynamic photoelasticity with the aid of Cranz-Shardin type high speed camera system is utilized to record the dynamically propagating behavior of the interface crack. This paper investigates the effects of the hole (existed along the path of the crack propagation) shape on the dynamic interface crack propagation behavior by comparing the experimental isochromatic fringes to the theoretical stress fields.

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계면에 존재하는 구멍의 모양이 동적 계면균열전파에 미치는 영향 (Effect of Interface Hole Shape on Dynamic Interface Crack Propagation)

  • 윤해룡;이억섭
    • 대한기계학회논문집A
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    • 제26권7호
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    • pp.1217-1222
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    • 2002
  • The dynamic photoelasticity with the aid of Cranz-Shardin type high speed camera system is utilized to record the dynamically propagating behavior of the interface crack. This paper investigates the effects of the hole (existed along the path of the crack propagation) shape on the dynamic interface crack propagation behavior by comparing the experimental isochromatic fringes to the theoretical stress fields.

면외전단하중이 작용하는 기능경사재료 접합면 균열의 동적전파에 관한 연구 (Dynamic Propagation of a Interface Crack in Functionally Graded Layers under Anti-plane Shear)

  • 신정우;이영신;김성찬
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2010년도 정기 학술대회
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    • pp.459-464
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    • 2010
  • The dynamic propagation of an interface crack between two dissimilar functionally graded layers under anti-plane shear is analyzed using the integral transform method. The properties of the functionally graded layers vary continuously along the thickness. A constant velocity Yoffe-type moving crack is considered. Fourier transform is used to reduce the problem to a dual integral equation, which is then expressed to a Fredholm integral equation of the second kind. Numerical values on the dynamic energy release rate (DERR) are presented. Followings are helpful to increase of the resistance of the interface crack propagation of FGM: a) increase of the gradient of material properties; b) increase of the material properties from the interface to the upper and lower free surface; c) increase of the thickness of FGM layer. The DERR increases or decreases with increase of the crack moving velocity.

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Dynamic Mixed Mode Crack Propagation Behavior of Structural Bonded Joints

  • Lee, Ouk-Sub;Park, Jae-Chul;Kim, Gyu-Hyun
    • Journal of Mechanical Science and Technology
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    • 제14권7호
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    • pp.752-763
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    • 2000
  • The stress field around the dynamically propagating interface crack tip under a remote mixed mode loading condition has been studied with the aid of dynamic photoelastic method. The variation of stress field around the dynamic interface crack tip is photographed by using the Cranz-Shardin type camera having $10^6$ fps rate. The dynamically propagating crack velocities and the shapes of isochromatic fringe loops are characterized for varying mixed load conditions in double cantilever beam (DCB) specimens. The dynamic interface crack tip complex stress intensity factors, $K_1\;and\;K_2$, determined by a hybrid-experimental method are found to increase as the load mixture ratio of y/x (vertical/horizontal) values. Furthermore, it is found that the dynamically propagating interface crack velocities are highly dependent upon the varying mixed mode loading conditions and that the velocities are significantly small compared to those under the mode I impact loading conditions obtained by Shukla (Singh & Shukla, 1996a, b) and Rosakis (Rosakis et al., 1998) in the USA.

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이종재료의 진전 계면 균열에 대한 동적 광탄성 실험법 (Dynamic Photoelastic Experimental Method for Propagating Interfacial Crack of Bimaterials)

  • 신동철;황재석
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2000년도 추계학술대회논문집A
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    • pp.292-297
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    • 2000
  • In this research, the dynamic photoelastic experimental hybrid method for bimaterial is introduced. Dynamic biaxial loading device is developed, its strain rate is 31.637 s-1 and its maximum impact load is 20 ton. Manufactured methods for model of the dynamic photoelastic experiment for bimaterial are suggested. They are bonding method(bonding material: AW106, PC-1) and molding method. In the bonding method, residual stress is not occurred in the manufactured bimaterial. Crack is propagated along the interface or sometimes deviated from the interface. While in the molding method, residual stress is occurred in the manufactured bimaterial. Crack is always deviated from the interface and propagated in the epoxy region(softer materila). In order to propagate with constant velocity along the interface of bimaterial with arbitrary stiffer material, edge crack should be located along the interface of the acute angle side of the softer material in the bimaterial.

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구멍을 통과하는 계면균열의 전파거동 (Propagation behavior of the interface crack through a hole)

  • 이억섭;윤해룡;황시원;변귀환
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2000년도 춘계학술대회논문집A
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    • pp.127-131
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    • 2000
  • The dynamic photoelasticity with the aid of Cranz-Shardin type high speed camera system is utilized to record the dynamically propagating behavior of an interface crack. This paper investigates determined the effects of the hole (existed on the path of the crack propagation) on the crack propagation behavior by comparing the experiment isochromatic fringes to the theoretical stress fields.

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