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Thursday, May 14, 2020 | History

3 edition of Effect of stress concentrations in composite structures found in the catalog.

Effect of stress concentrations in composite structures

Effect of stress concentrations in composite structures

  • 380 Want to read
  • 10 Currently reading

Published by National Aeronautics and Space Administration in [Washington, D.C.? .
Written in English

    Subjects:
  • Composite construction.

  • Edition Notes

    Statementby C.D. Babcock and W.G. Knauss.
    SeriesNASA-CR -- 173976., SM report -- 84-17., NASA contractor report -- NASA CR-173976., SM report (Pasadena, Calif.) -- 84-17.
    ContributionsKnauss, Wolfgang Gustav., United States. National Aeronautics and Space Administration., California Institute of Technology. Graduate Aeronautical Laboratories.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17667054M

      Structures and Materials- Section 7 Stress Concentration 1. Section 7 Stress Concentration Stress concentrations produced by discontinuities in structures such as holes, notches, and fillets will be introduced in this section. The stress concentration factor will be defined.   Structural Integrity Analysis features a collection of selected topics on structural design, safety, reliability, redundancy, strength, material science, mechanical properties of materials, composite materials, welds, finite element analysis, stress concentration, failure mechanisms and criteria.

      The effect of stress concentrations produced by a circular hole, on the static and fatigue strengths of plain concrete in uniaxial compression, is investigated by experiments. Tests conducted on prismatic specimens showed that the ultimate static compressive strength and the fatigue strength is not significantly altered by the introduction of Cited by: 1. Chapter 1: Introduction to Composite Materials / 7 Fig. , the coupling between e xx and e yy does not occur. In this case, the application of a ten-sile stress produces elongation in the x-direction and contraction in the y-direction, and the dis-torted element remains rectangular. therefore, the coupling effects exhibited by composites occur.

    composite structures including thick composite spars and yokes are presented. In particular, micro-focus computed tomography (CT) is a proven non-destructive evaluation (NDE) technology enabling three-dimensional measurement of manufacturing defects including wrinkles and porosity/voids [1].File Size: 1MB. JOURNAL OF COMPOSITE Article MATERIALS Modeling the effects of stress concentrations on the initiation of matrix cracking in woven CMCs M.P. Rao1,2, M. Pantiuk1 and P.G. Charalambides1 Abstract In this study, we employ detailed three-dimensional (3D) .


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Effect of stress concentrations in composite structures Download PDF EPUB FB2

Whilst stress concentrations have their most significant effect under fatigue loading conditions and impact situations, nevertheless, there are also some important considerations for static loading applications, namely: (a) In the presence of ductile yielding, stress concentrations are relatively unimportant since the yielding which will occur at the concentration, e.g.

the tip of a notch. Get this from a library. Effect of stress concentrations in composite structures. [Charles D Babcock; Wolfgang Gustav Knauss; United States. National Aeronautics and Space Administration.; California Institute of Technology. Graduate Aeronautical Laboratories.].

Get this from a library. Effect of stress concentrations in composite structures: progress report. [Charles D Babcock; Anthony M Waas; California Institute of Technology. Graduate Aeronautical Laboratories.; United States. National Aeronautics and Space Administration.].

EFFECT OF STRESS CONCENTRATIONS ON FATIGUE OF COMPOSITE AND METALLIC STRUCTURES by ROSS HENRY FALEN A THESIS Presented to Author: Ross Henry Falen. Composites have a significantly lower ability than metals to redistribute stresses around areas of stress concentrations or notches.

Unlike metals where this stress redistribution is accomplished via yielding of the material around the notch, composites have limited stress redistribution by local damage creation.

In addition to stress analyses of laminated composites, we need more fundamental understanding of the failure mode, the failure criterion, the effects on global laminate response, and the design of composites in the presence of stress concentrations.

In this book, all the subjects studied are closely related to the problem of stress. In addition to stress analyses of laminated composites, we need more fundamental understanding of the failure mode, the failure criterion, the effects on global laminate response, and the design of composites in the presence of stress concentrations.

In this book, all the subjects studied are closely related to the problem of stress 5/5(2). used to provide comprehensive stress and strength analysis of composite structures with stress concentrations. The methodology provides designer/analysts with a user- oriented procedure which, within acceptable engineering accuracy, accounts for the effects of File Size: 1MB.

Possible reasons for this discrepancy are discussed, including the effect of stress concentrations and singularities at the crack tip. Select 16 - Stress analysis of bonded patch. The numerical calculations of the state of reduced stress in the plate with the slot at the biaxial load made it possible to determine areas of stress concentration around the top of the aperture.

Effects of particle arrangement on stress concentrations in composites Article in Materials Science and Engineering A () September with 30 Reads How we measure 'reads'.

The circular cutout is considered as a typical source of stress concentrations in rectangular plate type structures. The proper position of a cutout in a rectangular plate can be significantly affected by the choice of material, cutout size, and various end conditions which are relative to the externally applied force.

The research work entitled in this paper deals with the finite element Author: Pavan Kishore Mamaduri, Himam Saheb Shaik, Chandrashekhar A. Stress Concentration and Stability Studies in Composite Ribs with flanged cutouts Paper Paper Reference Reference Num ber: Ruchin Pandey, Sandeep Sandeep Thakur and Ramanath Ramanath KS, CAE Group, Infosys Technologies Limited, Bangalore, India.

([email protected]) Prof. Interacting stress concentration factors and their effect on fatigue of metallic aerostructures Recommended Citation Whitley, David Warren, "Interacting stress concentration factors and their effect on fatigue of metallic aerostructures" ().

Doctoral Dissertations. the effect of stress concentrations placed in close proximity to. effect of micro-thermal stresses on the failure of fiber reinforced composites at cryogenic temperatures.

These results are compared to results obtained using available phenomenological failure criteria. The DMM, first proposed by Sankar, is a finite element-based micromechanical analysis of the composite unit cell (also called a.

(Notch Sensitivity and Fatigue Notch Factor, K f) The effect of the notch in the stress-life approach is taken into account by modifying the unnotched S-Ncurve through the use of the fatigue notch factor, K f.

Notched fatigue strength not only depends on the stress concentration factor, but also on other factors such as the notch. A stress concentration (also called a stress raiser or a stress riser) is a location in an object where the stress is significantly greater than the surrounding region.

Stress concentrations occur when there are irregularities in the geometry or material of a structural component. In the context of application, discontinuities are expected which in turn are the root cause for failure of material in later stage due to stress concentration.

Provision of patches at discontinuities can address this and effect of internal patches on stress concentration at circular discontinuity is considered in laminate : N.

Yathisha, S. Suresha. This paper deals with the effect of interface structures on the mechanical properties of fiber reinforced composite materials.

First, the background of research, development and applications on hybrid composite materials is introduced. Second, metal/polymer composite bonded structures are discussed. Then, the rationale is given for nanostructuring the interface in composite materials and Cited by: Some of these advanced NDT methods are of great significance to the area of composites and composite structures, because some of the flaws have the thickness dimensions smaller than µm, say, in the case of a tight delamination or even closer to the fibre diameter as in the cases of a fibre break, matrix cracking, etc.

Delaminations are most. Discontinuities and eccentricities, which are common in practical structures, increase the difficulty in predicting accurately detailed local stress distributions, especially when the component is built of a composite material, such as a graphite-epoxy material. The use of composite materials in the design of aircraft structures.Composite laminates are used for the construction of a wide range of products; from civil infrastructure to aeronautical or space structures.

Since all these structures cannot be built at once, but they are composed by several structural elements connected in various patterns, the problem of stress concentrations strikes by: 2.2. Fatigue Life Model. Fatigue damage in composite structures can be modelled adopting various approaches.

The most popular fatigue life models for composite materials are based on the residual strength and the residual stiffness degradation [] or damage mechanisms criteria are based on the phenomenon that the development of fatigue damage results in changes of the .