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Tuesday, July 28, 2020 | History

2 edition of Analyses of surface cracks in finite plates under tension or bending loads found in the catalog.

Analyses of surface cracks in finite plates under tension or bending loads

J. C Newman

Analyses of surface cracks in finite plates under tension or bending loads

by J. C Newman

  • 216 Want to read
  • 14 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in Washington, D.C, [Springfield, Va .
Written in English

    Subjects:
  • Strains and stresses,
  • Materials -- Fatigue,
  • Plates (Engineering)

  • Edition Notes

    StatementJ.C. Newman, Jr., I.S. Raju
    SeriesNASA technical paper -- 1578
    ContributionsRaju, I. S, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
    The Physical Object
    Pagination43 p. :
    Number of Pages43
    ID Numbers
    Open LibraryOL14932570M

    In this paper, a fatigue test of a X80 pipeline steel specimen with a semi-elliptical defect was performed to study the fatigue propagation stages of the Surface cracks. Based on the obtained test data, a three dimentional finite element procedure was developed for the crack growth estimation of the surface crack in the specimen. In the numerical analysis of crack growth, both the crack depth. Plastic Limit Loads for Slanted Through-Wall Cracks in Cylinder and Plate Based on Finite Element Limit Analyses et al., , “Non-Linear Fracture Mechanics Analyses of Part Circumferential Surface Cracked Mis-Match Limit Load Analyses and Approximate J-Integral Estimates for Similar Metal Weld With Weld-Center Crack Under Tension.

    R€ bending multiplier for corner crack in a plate Rch bending multiplier for corner crack at a hole in a plate H j bending maultiplier on stress intensity for remote bending He bending multiplier for surface crack in a plate h half-length of cracked plate K stress-tntensity factor (mode I) N applied beanding moment Mi curve fitting functions. a surface crack penetrating part through the thickness. At re­ mote distances from the crack site, the plate is subjected to loads equipollent to a uniform simple tension in the s2-direction and to pure bending about the rr-i-direction. This configuration, and its variants for curved shells rather than plates, is of considerable in­.

    Get this from a library! Surface cracks in a plate of finite width under tension or bending. [F Erdogan; H Boduroglu; Lehigh University.; Langley Research Center.]. bending behavior - associated with moment and shear loads applied to the plate’s edges, and transverse loads in the z- direction. Figure See Plate and associated (x, y, z) coordinate system.. depicts a plate and an associated (x, y, z) coordinate system. The top and bottom surfaces lie at z = ±t/2. The flat surface z = 0 is the plate.


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Analyses of surface cracks in finite plates under tension or bending loads by J. C Newman Download PDF EPUB FB2

Factor of a surface crack in a finite plate subjected to tension and bending loads has been fitted to the present finite-element results for a/c from to ] Analyses of surface cracks in finite plates under tension or bending loads. Washington, D.C.: National Aeronautics and Space Administration, Scientific and.

Systematic detailed non-linear finite element (FE) analyses are described for semi-elliptical surface cracks in plates under tension.

Limit load solutions are obtained from the FE J results through the reference stress method. The results show that the type of the relationship between J and the limit load mainly depends on the ratio a/t, where a is the crack depth and t the thickness of the by: The ratios of crack length to plate thickness and the ratios of crack depth to crack length ranged from 0 to The effects of plate width on stress-intensity variations along the crack front were also included.

The equation was used to predict patterns of surface-crack growth under tension or bending fatigue by:   Int. Pres. Ves. & Piping 57 () Finite element analysis of limit loads for surface cracks in plates Iradj Sattari-Far The Swedish Plant Inspectorate, BoxS Stockhom, Sweden (Received 17 December ; accepted 11 January ) Ligament yielding of plates containing semi-elliptical surface cracks under single (tensile or bending) and combined loads Cited by:   Elastic-plastic analyses for surface cracked plates under combined bending and tension Article (PDF Available) in The Journal of Strain Analysis for Engineering Design 37(1).

Three-dimensional finite-element and finite-alternating methods were used to obtain the stress-intensity factors for small surface and corner cracked plates subjected to remote tension and bending. Analysis of surface cracks in finite plates under tension and bending loads.

NASA TP, National Aeronautics and Space Administration. Newman, J. C., Jr. Analyses of Surface Crack in Finite Plates Under Tension or Bending Loads. The equation was used to predict patterns of surface-crack growth under tension or bending fatigue loads.

A modified. Recent precise, elastic numerical solutions to a surface flaw in a plate under remote tension and bending have been compared to arrive at a ‘best estimate’ of the stress-intensity-factor variation along the flaw border.

The geometry of the semielliptical surface flaw examined had a depth to length ratio of (a/2c=) and and percent relative crack depths (a/t=, ). corner crack in a finite plate subjected to uniform tension are given in Tables l and 2, respectively, for various parametric angles and several a/c and a/t ratios.

Newman J. and Raju I.: Analysis of surface cracks in finite plates under tension of bending loads NASA TP, Google Scholar (8). Paris P. and Sih G.:. The mode I crack problem in plates under membrane loading and bending is reconsidered. The purpose is to examine certain analytical features of the problem further and to provide some new results.

The formulation and the results given by the classical and the Reissner plate theories for through and part-through cracks are compared. For surface cracks the three-dimensional finite element. I-values calculated for a number of semi-elliptical, surface-crack geometries in functionally-graded plates under mode-I tension, bending and thermal loads.

Some final remarks and observations conclude the study. Finite element analysis including graded material properties. J.C. Newman Jr., and I.S. Raju, “Analyses of Surface Cracks in Finite Plates under Tension or Bending Loads” (NASA TP, USA, ). Google Scholar. Fracture surface observation shows that cracks initiate under the surface in the coated samples.

The maximum principal stress values determined in the finite element analysis for the two loading cases with the maximum D. SemenskiFatigue growth of multiple cracks in plates under cyclic tension. Trans. FAMENA, 34 (), pp. Google. A new global limit load solution is developed in this paper for a precise semi-elliptical surface crack in a plate under combined tension and bending, based on the net-section collapse principle.

The new global limit load solution is compared with finite element (FE) results for the semi-elliptical crack, and with the global limit load solution. Stress intensity factor equations are presented for an embedded elliptical crack, a semielliptical surface crack, a quarter elliptical corner crack, a semielliptical surface crack along the bore of a circular hole, and a quarter elliptical corner crack at the edge of a circular hole in finite plates.

The plates were subjected to either remote tension or bending loads. (1), (Moussa et al., ) used FEM to analyze interaction of two identical parallel non-coplanar surface cracks subjected to remote tension and pure bending loads.

The interaction factor as a function of stress shielding to cause overlapping in distance is studied using three dimensional linear finite element analyses. The problem of a surface or an internal crack in a plate which contains residual stresses is examined.

The line spring model, which reduces a three-dimensional elasticity problem into a two-dimensional problem in plate theory, is used to model the crack. The Reissner plate theory, which takes into account transverse shear deformations, is used to model the plate.

Stress-intensity factor equations for cracks in three-dimensional finite bodies subjected to tension and bending loads Stress intensity factor equations are presented for an embedded elliptical crack, a semielliptical surface crack, a quarter elliptical corner crack, a semielliptical surface crack along the bore of a circular hole, and a quarter elliptical corner crack at the edge of a.Abstract This paper presents an empirical stress-intensity factor equation for a surface cracks as a function of parametric angle, crack depth, crack length, plate thickness and plate width for tension and bending loads.

The stress-intensity factors used to develop the equation were obtained from a previous three-dimensional, finite-element analysis of semielliptical surface cracks in finite.Raju, “ Analysis of Surface Cracks in Finite Plates Under Tension or Bending Loads,” NASA Technical PaperNational Aeronautics and Space Administration, December Parks, D.

M., “ The Inelastic Line Spring: Estimates of Elastic-Plastic Fracture Mechanics Parameters for Surface-Cracked Plates and Shells,” Journal of.