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Saturday, August 1, 2020 | History

3 edition of Cracking of coated materials under transient thermal stresses found in the catalog.

Cracking of coated materials under transient thermal stresses

Cracking of coated materials under transient thermal stresses

  • 211 Want to read
  • 19 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Ceramic coatings.,
  • Crack arrest.,
  • Crack propagation.,
  • Cracking (Fracturing),
  • Stainless steels.,
  • Stress analysis.,
  • Thermal stresses.,
  • Transient loads.

  • Edition Notes

    Statementby A.A. Rizk and F. Erdogan.
    SeriesNASA contractor report -- NASA CR-184898.
    ContributionsErdogan, F., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15408247M

    In addition to the time-varied stresses and stress intensity factors for various parameters of the problem, the effect of periodic cracking on the relaxation of the transient stress on the coating surface is discussed. Also included is the influence of the material gradient (material nonhomogeneity) on the crack tip intensity factors and by:   The temperature distribution in structural elements in practical cases usually changes in two or three directions. Based on such facts, aiming at more effectiveness, a functionally graded material (FGM), whose properties change in two or three directions, is introduced, that investigated here called bi-directional FGM. The current study aims at the formulation, solution and investigation of a Cited by:

    Transient thermal stress intensity factors of near surface cracks Wei-Chung Wang ductile fracture originating from cracks or crack-like defects in structural materials are costly at best and could be catastrophic. A practical example of a severe thermal transient is the behavior. and /A /Cited by: 9. Stress corrosion cracking (SCC) is the growth of crack formation in a corrosive environment. It can lead to unexpected sudden failure of normally ductile metal alloys subjected to a tensile stress, especially at elevated is highly chemically specific in that certain alloys are likely to undergo SCC only when exposed to a small number of chemical environments.

    Factors Affecting Thermal Stress Resistance of Ceramic Materials by W. D. KINGERY Ceramics Division, Department of Metallurgy, Massachusetts lnstihrte of Technology, Cambridge, Massachusetts The sources and calculation of thermal stresses are considered, together with the factors in- volved in thermal stress resistance factors. As a result of the increased usage of industrial and construction materials the interest in the thermal stress problems has grown considerably, typified by the annular fins of heat e xchangers and brake disc rotors, because of its elementary geometry.


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Cracking of coated materials under transient thermal stresses Download PDF EPUB FB2

Get this from a library. Cracking of coated materials under transient thermal stresses. [A A Rizk; F Erdogan; United States.

National Aeronautics and Space Administration.]. The crack problem for a relatively thin layer bonded to a very thick substrate under thermal shock conditions is considered. The effect of surface cooling rate is studied by assuming the temperature boundary condition to be a ramp : Fazil Erdogan and A.

Rizk. The crack problem for a relatively thin layer bonded to a very thick substrate under thermal shock conditions is considered. The effect of surface cooling rate is studied by assuming the temperature boundary condition to be a ramp : F.

Erdogan and A. Rizk. Transient thermal stress analysis of an edge crack in a functionally graded material 75 A multi-layered material model is used to solve the temperature field. By using Laplace trans- form and asymptotic analysis, an analytical first order temperature solution for short times is Size: KB.

T1 - Transient thermal stress analysis of an edge crack in a functionally graded material. AU - Jin, Z. AU - Paulino, Glaucio. PY - /1/1. Y1 - /1/1. N2 - An edge crack in a strip of a functionally graded material (FGM) is studied under transient thermal loading by:   The transient thermal stress field has been derived in a closed form for the corresponding untracked counterpart medium.

By applying the equal thermal stresses but with opposite sign on the crack surface to be the only external load, the thermal stress intensity factors (TSIFs) at the crack tip were then obtained. An edge crack in a strip of a functionally graded material (FGM) is studied under transient thermal loading conditions.

The FGM is assumed having constant Young's modulus and Poisson's ratio, but the thermal properties of the material vary along the thickness direction of the strip.

Thus the material is elastically homogeneous but thermally by: The thermal insulation of a crack was found to have a great impact on the fracture parameters Hutchinson and Lu, ; Qian et al., The residual stresses which are induced in the fabrication process of the TBCs are, a priori, associ- ated with many mechanical failures of the coating.

The outer panes of all units had no potential for thermal breakage, day or night, since the centres of the panes were either about the same temperature as the edges (no thermal stresses) or the centres were colder than the edges, resulting in compressive stresses at the edges and low tensile stresses.

Thermal stresses, Bars subjected to tension and Compression Compound bar: In certain application it is necessary to use a combination of elements or bars made from different materials, each material performing a different function. In over head electric cables or Transmission Lines forFile Size: KB.

Journal of Thermal Stresses. Impact Factor. Search in: Advanced search An axisymmetric crack in a functionally graded thermal barrier coating bonded to a homogeneous elastic substrate under transient thermal loading.

Ueda et al. Published online: 30 Apr The paper is concerned with the transient thermal stress problem for a long hollow circular cylinder containing an internal axisymmetric circumferential edge crack that is suddenly cooled from inside. It is assumed that the transient thermal stress problem is quasi-static, i.e., the inertial effects are negligible.

Stress corrosion cracking (SCC) is interpreted to take place due to specific combinations of susceptible materials in suitable corrosion environments under adequate stress, specifically under constant stress, Figure 1.

The equivalent mechanism for crack growth under cyclic stresses is called corrosion fatigue (CF), and crack growth here depends upon the stress ratio. The bottom surface is assumed to be zero temperature or thermally insulated.

First the transient temperature and the stress distributions in an uncracked strip are calculated. Then, these stresses are used as the crack surface traction with opposite sign to Cited by: Detailed coverage of cracking in multilayers is provided, with an emphasis on the role of differences in thermoelastic properties between the layers.

The comprehensive theoretical foundation of the book is complemented by easy-to-use Cited by: Evaluating Cracking in Concrete 7 THERMAL STRESSES Volume differentials are likely to develop in the concrete when different temperatures occur across a concrete section.

The concrete then cracks when the tensile stresses imposed by a change in volume differential exceed that of its tensile strength. Thermal stresses usually cause cracking in massFile Size: KB. the surface. This restraint creates tensile stresses that can crack the surface concrete as a result of this uncontrolled temperature difference across the cross section.

In most cases thermal cracking occurs at early ages. In rarer instances thermal cracking can occur when concrete surfaces are ex-posed to extreme temperature Size: KB. Figure Thermal stresses for ca 11 and 12 in Table 64 Figure Thermal stresses for ca 14 and 15 in Table 65 Figure Thermal stresses for ca 17 and 18 in Table 66 Figure Thermal stresses for ca 20 and 21 in Table Thermal stress developed in the laser cutting region is involved with elasto-plastic material behavior under the high-temperature gradients.

The formula for the thermal-stress problem is given below. The formula for the thermal-stress problem is given below. The higher susceptibility of Be–W mixed material to cracking under transient thermal loads is a concern for the ITER divertor, because cracking can lead to the development of leading edges that receive higher heat loads than surrounding material.

In addition, cracking lowers the effective thermal conductivity. A single 10 ms laser pulse Cited by: 3. of two crack types, primary cracks with a long depth range of about µm and deeper, and secondary cracks which in general extend only to a few tens of micrometres, i.e.

to a depth which is determined by the penetration of the heat front during the ELM event and the associated thermal stress due to expansion of the by: TRANSIENT STRESSES OF A FUNCTIONALLY GRADED PROFILE WITH TEMPERATURE-DEPENDENT MATERIALS UNDER THERMAL SHOCK Antonios M.

Nikolarakis 1 and Efstathios E. Theotokoglou 2 1,2 Department of Mechanics – Laboratory of Testing and Materials, School of Applied Mathematical and Physical Science.Thermal Fatigue.

Thermal cycling causes expansion and contraction, hence thermal stress, if component is restrained. Solutions: eliminate restraint by design use materials with low thermal expansion coefficients Corrosion fatigue. Chemical reactions induce pits which act as stress raisers. Corrosion also enhances crack propagation.

Solutions.