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Thursday, May 14, 2020 | History

3 edition of Determination of stress intensity factors for interface cracks under mixed-mode loading found in the catalog.

Determination of stress intensity factors for interface cracks under mixed-mode loading

Rajiv A. Naik

Determination of stress intensity factors for interface cracks under mixed-mode loading

by Rajiv A. Naik

  • 103 Want to read
  • 7 Currently reading

Published by National Aeronautics and Space Administration, Langley Research Center, For sale by the National Technical Information Service in Hampton, Va, [Springfield, Va .
Written in

    Subjects:
  • Fracture mechanics.,
  • Materials -- Fatigue.

  • Edition Notes

    StatementRajiv A. Naik and John H. Crews, Jr.
    SeriesNASA technical memorandum -- 107624.
    ContributionsCrews, John H., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15361729M

    Stress-intensity factors for surface cracks in functionally graded materials under mode-I thermomechanical loading Matthew C. Walters, Glaucio H. Paulino, Robert H. Dodds Jr. * Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign,File Size: 2MB. This paper describes the application of the complex variable meshless manifold method (CVMMM) to stress intensity factor analyses of structures containing interface cracks between dissimilar materials. A discontinuous function and the near-tip asymptotic displacement functions are added to the CVMMM approximation using the framework of complex variable moving least-squares (CVMLS) by: 5.

    Stress intensity factor computation using the method of fundamental solutions: mixed-mode problems A variety of methods are currently available for computing stress intensity factors (SIFs) for elastic crack problems. The SIF is a measure of the strength of the stress singularity at a crack The calculation of SIFs in nite solids under. cracked components, it is important to know the individual stress intensity factors (SIF) under mixed mode loading. This paper presents the SIF and interaction behavior of multiple radial cracks in an un notched round bar subjected to far filed tension loading. Three surface cracks of same.

    developed by Bueckner [1] and Rice [2] simplifies considerably the determination of stress intensity factors. If the weight function is known for a given cracked body, the stress intensity factor due to any load system applied to the body can be determined by using the same weight function. Therefore there is no need to derive ready made stress. Theoretical models of the stress intensity factor (SIF) of the interface crack under steady mechanical-thermal coupled loads are built. Based on which the interface crack SIFs in the cermet cladding material of 5Cr2Ni08C/Q under the same loads are analyzed with the finite element method.


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Determination of stress intensity factors for interface cracks under mixed-mode loading by Rajiv A. Naik Download PDF EPUB FB2

Determine stress intensity factors (K. and K2) for interface cracks under mixed-mode loading. This technique involves the calculation of crack-tip stresses using non-singular finite elements. These stresses are then combined and used in a lilnear regression procedure to calculate K l and K Size: 1MB.

A simple technique was developed using conventional finite element analysis to determine stress intensity factors, K1 and K2, for interface cracks under mixed-mode loading. This technique involves the calculation of crack tip stresses using non-singular finite elements.

INTRODUCTION THE DETERMINATION of thermal stress intensity factors (TSIFs) for interface cracks under thermal boundary conditions is a very important topic in fracture mechanics.

Bimaterials with interface cracks have mixed mode stress intensity factors because of the discontinuities of the material properties and geometries, even under unidirectional mechanical by: A simple technique was developed using conventional finite element analysis to determine stress intensity factors, K1 and K2, for interface cracks under mixed-mode loading.

This technique involves the calculation of crack tip stresses using non-singular finite : Rajiv A. Naik and Jr.

John H. Crews. In X‐FEM, an interface crack can be modelled by locally changing an interpolation function in the element near a crack. The energy release rate should be separated into individual stress intensity factors, K 1 and K 2, because the stress field around the interface crack has mixed modes coupled with mode‐I and mode‐II.

For this purpose Cited by: A method for the determination of stress intensity factor (SIF) in a cracked plate stiffened by symmetrically bonded strip-patches (or stiffeners) under biaxial loading is presented.

The patches are modeled by considering their longitudinal and transverse by: 2. Determination of mixed-mode stress intensity factors, fracture toughness, and crack turning angle for anisotropic foam material. Determination of mixed-mode stress intensity factors, fracture toughness, and crack turning angle for anisotropic foam material.

element code. At each crack increment length, the kinking angle is evaluated as a function of stress intensity factors (SIFs) [3].De Xiea and Sherrill B. Biggers developed an interface element to solve 2D progressive crack growth problems under mixed-mode loading.

The interface element is developed to calculate the strain energy release ratesFile Size: KB. Computation of Mixed-Mode Stress Intensity Factors for Cracks in Three-Dimensional Functionally Graded Solids Matthew C.

Walters1; Glaucio H. Paulino2; and Robert H. Dodds Jr.3 Abstract: This work applies a two-state interaction integral to obtain stress intensity factors along cracks in three-dimensional function- ally graded materials.

Determination of Small Crack Stress Intensity Factors for an American Society for Testing Materials (ASTM) Middle Tension Test Specimen by Finite Element Method. Callum Wright. Air Vehicles Division. Defence Science and Technology Organisation.

DSTO-TR ABSTRACT. [2] Yongming Liu, Sankaran Mahadevan “Threshold stress intensity factor and crack growth rate prediction under mixed-mode loading” Engineering Fracture Mechanics 74 ()– [3] Mohit Pant, I.V. Singh, B.K. Mishra “Evaluation of mixed mode stress intensity factors for interface cracks using EFGM” Applied Mathematical Modeling Stress intensity factors of surface cracks in coating/substrate system under cylindrical indenter is investigated.

Then, the variations of stress intensity factors of single and double surface crack(s) with different coating/substrate materials, different crack length, and different crack Author: Yumei Bao, Guozhong Chai, Xiaoling Lou, Weina Hao.

The paper studies the distribution of the mode I, II, and III stress-intensity factors (SIFs) for a penny-shaped interface crack in a bimaterial under normal harmonic loading.

The dependence of SIFs on the type of a wave (compression–dilatation or shear), loading frequency, and the mechanical properties of the bimaterial is analyzedCited by: 5. In this paper, a method is presented that facilitates the determination of stress intensity factors in composite bonded joints with interfacial or interlaminar cracks.

The method is based on a global/local concept, where the displacements and stresses away from the crack tip are found by a conventional finite element by: 9. The mixed mode (complex) stress intensity factors for bi-material interface cracks are numerically evaluated using the modified domain form of interaction integral.

Stress concentrations around notches were considered in Chapter 3 with the stress concentration factor K t as an important parameter for characterizing the severity of the stress distribution around the notch. The crack initiation life is highly dependent on the K crack initiation period is followed by the fatigue crack growth period, recall Figure The crack starts to propagate in concrete when the crack tip stress intensity factor reaches the fracture toughness value (critical stress intensity factor KC or fracture energy GC).

Many studies. Note: For edge cracks, “a” is the whole length of the crack. (This equation derives from analysis of an infinite plate, but is used for all configurations.) 3. Determine the stress intensity modification factor (K I/K 0) for the actual geometry that you have.

Multiply K 0 by K I/K 0 to get K I, the actual stress intensity for your File Size: 56KB. Under mixed-mode loading, not only the fatigue crack propagation rate is of importance, but also the crack propagation direction.

In modified range ≤a/W≤, the stress intensity factors (SIFs) of mode I and mode II for the compact tension shear (CTS) specimen were calculated by using elastic finite element by: 8.

analyses an stress intensity factors of an elliptical surface crack in a circular shaft under tension and bending. Int J Fract (% Fiz. 17 Model deformations under combined bending and tor sion loadings closed under the pure torsion, and vice versa under the combined loadings.

The opening of the crack faces un- der combined loadings File Size: KB. Get this from a library! Determination of stress intensity factors for interface cracks under mixed-mode loading.

[Rajiv A Naik; John H Crews; Langley Research Center.].Stress Intensity Factors (SIFs) can be calculated in the Nuclear Electric’s R6 Code software(1) and other computer programs. Further, a number of methods are now available for evaluating stress intensity factors(2 to 8) and limit loads(9 to 15) of structures containing Size: 1MB.Interface crack between two elastic layers ZHIGANG SUO and JOHN W.

HUTCHINSON of this paper is to analyze interface cracks between thin films and substrates under fairly general loading conditions. The solution can be readily applied to a wide range of problems, full range of mixed-mode interface intensity factors. When the crack is.