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Friday, July 31, 2020 | History

2 edition of Notch effects in uniaxial tension specimens found in the catalog.

Notch effects in uniaxial tension specimens

T. J Delph

Notch effects in uniaxial tension specimens

by T. J Delph

  • 10 Want to read
  • 18 Currently reading

Published by Dept. of Energy, Oak Ridge National Laboratory, for sale by the National Technical Information Service] in Oak Ridge, Tenn, [Springfield, Va .
Written in English

    Subjects:
  • Notch effect,
  • Deformations (Mechanics),
  • Metals -- Effect of high temperatures on

  • Edition Notes

    StatementT. J. Delph ; prepared by the Oak Ridge National Laboratory
    SeriesORNL/TM ; 6716
    ContributionsOak Ridge National Laboratory
    The Physical Object
    Paginationiii, 17 p. :
    Number of Pages17
    ID Numbers
    Open LibraryOL14881798M

    37 Tension Test-Measures of Ductility • Recall: ductility is A measure of the ability of materials to withstand deformation without failure • Elongation is the value at fracture – For polymers (ASTM standard): strain ε f at the instant of fracture from stress-strain curve – For metals (ASTM standard): measured after it is broken using marks placed at a known distance apart prior to. ASTM E Standard Test Method for JIc, a Measure of Fracture Toughness. pp. in: annual book of ASTM standards, Metals Test Methods and Analytical Procedures, Vol. American Society for Testing and Materials, Philadelphia, PA, [9] M.Y. He, B. Wu, Z. Suo Notch-sensitivity and Shear Bands in Brittle Matrix Composites?

    The design and assessment of modern high temperature plant demands an understanding of the creep and rupture behaviour of materials under multi axial stress states. Examples include thread roots in steam turbine casing bolts, branch connections in nuclear pressure vessels and blade root fixings in. The factor K t depends mainly on the geometry of the notch, not on the material, except when the material deforms severely under load. K t values are normally obtained from plots such as in Figure 2 and arestrictly valid only for ideally elastic, stiff members. K t values can also be determined by FEA or by several experimental techniques. There are no K t values readily available for sharp.

    notch, the specimen would experience uniaxial stress (tension and compression) at impact. The notch al- lows triaxial stresses to develop. Most materials become more brittle under triaxial stresses than under uniaxial stresses. At F ( C), the energy required to cause failure ranges from 45 ft-lbf (60 J) for carbon steels to ap-. To examine these effects, creep damage has been introduced into H stainless steel material by interrupting creep crack growth (CCG) tests on compact tension, C(T), specimens at °C. During the CCG tests, the specimen is loaded in tension, crept and unloaded after a .


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Notch effects in uniaxial tension specimens by T. J Delph Download PDF EPUB FB2

Get this from a library. Notch effects in uniaxial tension specimens. [T J Delph; Oak Ridge National Laboratory.].

@article{osti_, title = {Notch effects in uniaxial tension specimens}, author = {Delph, T. J.}, abstractNote = {Results of a literature survey on the effect of notches on the time-dependent failure of uniaxial tension specimens at elevated temperatures are presented.

Multiaxial fatigue data were generated for 2 materials and 3 notch geometries. • Notch deformation was analyzed using a pseudo stress-based plasticity model.

• Stress–strain predictions were compared to nonlinear FEA. • Stress gradients considered using critical distances and fatigue notch by: Experimental data in the literature summarizing varied notch effects found in different metallic glasses [], including notch strengthening [,], notch weakening [], and notch.

The notch geometry of all axi‐symmetric specimens was a notch tip radius of mm, a notch depth of 4 mm, an included V‐notch angle of 90° and a net section diameter of 12 mm. The notch strain approach of Pan and Sheppardfor determining the crack initiation life (a i = mm) combines the maximum structural stress range, Δσ s, with a uniform fatigue notch factor K f, estimated on the basis of Neuber’s notch stress theory and Neuber’s macrostructural support formula.

The hardness increase in. short specimens and for specimens of many materials it is generally necessary to use machined test specimens and to use a special means of gripping to ensure that the specimens, when under load, shall be as nearly as possible in uniformly distributed pure axial tension (see, and ).

Grips for Threaded and Shouldered File Size: KB. It was clearly confirmed that the majority of previously developed analytical FAD curves do not effectively account for notch and plasticity effects due to negative biaxiality. Based on this study, tension normal to the crack and compression parallel to the crack is the worst combination, and it has a very pronounced effect on FAD curve by: 2.

Ultrasonic fatigue tests up to cycles were performed on a turbine engine titanium alloy (Ti-8Al-1Mo-1V) at the stress ratio (R) of −1 with smooth specimens and at R = −1, and with notched specimens. As a result, with increase of fatigue life, the source of reduced fatigue life caused by multi-point surface crack initiation changes from crack propagation stage to crack Author: Kun Yang, Bin Zhong, Qi Huang, Chao He, Zhi-Yong Huang, Qingyuan Wang, Yong-Jie Liu.

COMMON FATIGUE TEST SPECIMENS Specimens shown have been used for obtaining fatigue crack growthdata. In all cases a thin slit, notch, or groove with a very small root radius is machined into the specimen.

Fatigue crack growth testing is covered in Section The cleavage fracture behavior, described by these parameters, was then verified by multiaxial tension-torsion tests carried out on thin tubular specimens.

Numerical simulations of the tension-torsion tests, by the finite element method, were also performed, taking into account the nonlinear geometrical effects and the specimen plastic : V. Koundy, S. Renevey, B.

Marini, A. Combescure. uniaxial tension tests on cylindrical specimens of diameter 30 mm and length 50 mm.

The same authors have also made three-point bend tests with specimens of different sizes (Fig. 1 b). For beams C ll was defined as ell = 31/2d(1 - lXo)". These specimens, however, were. Two general notch geometries have been used for these series of tests: U notch and V notch specimens.

The notches produce a tri axial stress state, though not uniform across the specimen. Characterization of the creep behavior of the U notch specimens and the creep rupture behavior of the V notch specimens provides a good approximation of the. The cross-sectional area of a specimen has a significant effect on elongation measurements.

Slimness ratio is measured by the gauge length divided by the square root of the cross-sectional area, therefore is inversely proportional with the cross-sectional area. Slimness Ratio = L0 /√ A0. L0 is. The presence of cracks in many historical objects indicates the action of external forces accompanied by internal strain gradients.

This is usually a repetitive process, and damage cumulation may occur. A study of these effects requires a suitable methodology for testing historical stone that has been subjected to repeated tension strains.

The chapter presents the results of a pilot Author: Martin Šperl, Miloš Drdácký. Classic, comprehensive, and up-to-date Metal Fatigue in Engineering Second Edition For twenty years, Metal Fatigue in Engineering has served as an important textbook and reference for students and practicing engineers concerned with the design, development, and failure analysis of components, structures, and vehicles subjected to repeated loading.

niques: uniaxial tension, biaxially stressed disks (usually clamped on the perimeter and loaded perpendicularly with a hemispherical tup), and notched beams loaded in bending. These three tests provide uniaxial, biaxial, and triaxial states of stress. Typical part geometries and loadings exhibit combinations of these states of stress.

Similar to the tests performed by Van Mier et al., the uniaxial tension tests for determining the average uniaxial tensile strength f c t m were performed on cylindrical specimens (sealed until testing) with a circumferential notch of 5 mm width and 16 mm depth at by: 3.

The uniaxial stress system is simple; hence, this test method is often used for studies of stress-corrosion mecha-nisms. This type of test is amenable to the simultaneous exposure of unstressed specimens (no applied load) with stressed specimens and subsequent tension testing to distin-guish between the effects of true stress corrosion and.

Pluvinage, G. () Notch effect in high cycle fatigue, Advances in Fracture Research, ICF9, Fatigue of Metallic and Non-metallic Materials and Structures 3, Pergamon, Sidney, pp.

– Google ScholarCited by: 1. The Fatigue Strength of Notched Specimens Introduction The fatigue limit of notched specimens at S m = 0 The similarity principle and the notch sensitivity The size effect on the fatigue limit of notched specimens The fatigue limit of notched specimens for S .A large number of notched-bar test specimens of different design have been used by investigators of the brittle fracture of metals.

Two classes of specimens have been standardized for notched-impact testing. Charpy bar specimens are used most commonly in the United States, while the Izod specimen is favored in Great Britain (see figure 4).File Size: KB.Fracture toughness tests are carried out with fracture mechanical specimens, e.g.

single edge notched bend (SENB) specimens or compact tension (CT) specimens. Both types are plane specimens. When investigating the integrity of thin-walled pressure pipelines, we face the problem of ensuring the planeness of the semiproducts for manufacturing the Cited by: