A new finite-element technique for modelling stable crack growth

Hoff, R.; Rubin, C.A.; Hahn, G. T.

doi:10.1016/0013-7944(86)90180-3

Cited by 22 publications

(3 citation statements)

References 30 publications

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“…Numerical methodology to generate a long fatigue crack for fatigue analysis were, usually employed a long narrow slot as a long stationary crack first, and then a short extended crack was made by applying specific node-released strategies, e.g., Newman [1], McClung and Sehitoglu [2], Nakagaki and Atluri [3], Hoff and Rubin [4], Mahanty and Maiti [5] etc. These simulations in crack did not consistent with the ASTM E647 fatigue precracked procedures [6] to produce a long fatigue crack.…”

Section: Introductionmentioning

confidence: 99%

Endofem Integrated Methodology for Fatigue Crack Growth

Lee

Hsiao²

2002

J. mech.

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In this paper, the FEM with the incremental endochronic cyclic plasticity (EndoFEM) and the r c controlled node-released strategy are employed to study the fatigue crack opened/closed load (P op ) of Al 2024-T3 CCT specimens provided by Mageed and Pandey under several crack lengths and the constant amplitude with various load ratio (R). After statisfactory results are achieved by comparisons of computed P op values and cited experimental data, the simulations will be extended to the crack lengths with significant bending effect due to short ligaments or high peak (P max ) or high positive or very low negative R cyclic loads. Through these simulations, the complete map of P op /Pmax vs. K max and R can be constructed and thereafter its correspondant empirical formulae can be proposed. Using these formulae and selecting the traditional fatigue crack growth parameter AK eff , the Al 2024-T3 fatigue crack growth rate da/dN vs. AK and R data, provided by Hiroshi and Schijve, can be employed to proposed empirical formulae of da/dN vs. AK eff and R. After integration, fatigue-crack-growth length a vs. N curves computed by EndoFEM can be obtained. The results are agreed very well with the existing experimental curves.According to the above procedures of simulation and steps of comparions with experiment, this paper may provides an integrate methodology of numerical simulation in the studies of fatigue crack growth for academic and industrial researches and design analysis.Keywords : EndoFEM with r c controlled node-released strategy, Crack opened/closed load, Bending effect of short ligament, Crack closure model, Fatigue crack rate vs. AK eff .

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Section: Introductionmentioning

confidence: 99%

Endofem Integrated Methodology for Fatigue Crack Growth

Lee

Hsiao²

2002

J. mech.

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“…The methods include most, if not all, of the well developed computational methods: finite difference, finite element, boundary integral equation (boundary element), element free Galerkin, molecular dynamic, and others [Liebowitz et al, 1995] [Aliabadi, 1995]. A large amount of effort, and the effort of this thesis, has been expended on fracture modeling using the fhiite element method (FEM) [Nishioka, 1997] 1985], [Parks, 1974], damage evolution [Lemaitre, 1986], discrete models [Hoff et al, 1986] [Liaw et al, 1984], and others. Some of these methods are cumbersome or inaccurate while others are inappropriate to use as engineering analysis tools in the modeling of discrete crack propagation.…”

Section: Introductionmentioning

confidence: 99%

An implicit finite element method for discrete dynamic fracture

Gerken

1999

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This report waspreparedasan accountof worksponsoredby an agencyof the UnitedStatesGovernment.NeitherTheRegentsoffhsUniversityof Gdfornia, the UnitedStates Governmentnor any agencythereojnor any of theiremployees, makesany warranty,express or implied,or assumesany legalliability or responsibilityjbr the accuracy,completeness, or u@kwss @anyinjimnation, apparatus, product,or processdisclosed, or representsthatits use wouldnot infringeprivatelyownedrights. Referenceherein toany speefic commercial product,process,or sm"ce by tradename, trademark, manufmturer,or otherwise, doestiot necessarilywnstituteor implyitsendorsement, recommendation, orfmoring by The Regents of the Universi@of Cal@rnia, the UnitedStatesGovernment, oranyagencythereof. The m"ews and opinwnsof authorsexpressedherez"n do notnecessarilystateor reflectthose of The Regentsof the Universityof Cal@rnia, the UnitedStatesGovernment,or any agency therwfi I% AlamosNationalLuboratoystronglysupportsacademicj+eedom and a researcher'sright topublish;asan institution, houwuer, theLaboratoydoesnot endorsethe m"ewpoint ofapublicationorguaranteeitstechnical correctness. DISCLAIMERPortions of this document may be illegible in electronic image products.Images are produced from the best available original document. . . . VIII

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“…[22] introduced a technique employing spring and gap elements to circumvent this problem, the method requires a subroutine to control the openings of the gap el-ements and thus does not put crack propagation under total control of the external loadings. In this study, we use nonlinear springs that have no restraining forces beyond a certain critical strain to imitate the failure characteristics of the cohesive material in the interlayer.…”

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confidence: 99%

The role of damage-softened material behavior in the fracture of composites and adhesives

1987

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It is found that the energy release rate derived by assuming built-in conditions at the crack tip can be used to calculate the fracture (surface) energy more accurately and conveniently than Berry's scheme [2] even in cases where the built-in assumption is apparently invalid. The analyses suggest that it is possible to infer from detailed macroscopic measurements of the deformations of the beam prior to and during crack growth the approximate characteristics of the complete (uniaxial ) material stress-strain behavior of the cohesive interlayer including loading and strain-softening. 21. This paper is a shortened version of reference 1.

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A new finite-element technique for modelling stable crack growth

Cited by 22 publications

References 30 publications

Endofem Integrated Methodology for Fatigue Crack Growth

Endofem Integrated Methodology for Fatigue Crack Growth

An implicit finite element method for discrete dynamic fracture

The role of damage-softened material behavior in the fracture of composites and adhesives

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