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3 edition of Cyclic fatigue of brittle materials with an indentation-induced flaw system found in the catalog.

Cyclic fatigue of brittle materials with an indentation-induced flaw system


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Cyclic fatigue of brittle materials with an indentation-induced flaw system Download PDF EPUB FB2

Static fatigue to cyclic fatigue life, introduced by Evans and Fuller [1]. In the case of the indentation flaw system, the solution requires a numerical approach since an additional driving force appears in the net stress intensity factor.

This term is attributed to residual contact stress produced by the elastic/plastic deformation of indenta-tion [2]. Analyses of dynamic and static fatigue of the indentation flaw system.

Materials Science and Engineering: A VolumeIssue 1, 15 AprilPages Cyclic fatigue of brittle materials with an indentation-induced flaw systemCited by: 6. Get this from a library. Cyclic fatigue of brittle materials with an indentation-induced flaw system. [Sung Rak Choi; J A Salem; United States.

National Aeronautics and Space Administration.]. A theory is formulated for the general fatigue response of brittle flaws which experience residual stress concentrations.

The indentation crack is taken as a model flaw system for the purpose of setting up the basic fracture mechanics equations, but the essential results are expected to have a wider range of applicability in the strength characterization of by: Cyclic Fatigue of Brittle Materials with an Indentation-Induced Flaw System.

By Jonathan A. Salem and Sung R. Choi. Abstract. The ratio of static to cyclic fatigue life, or 'h ratio', was obtained numerically for an indentation flaw system subjected to sinusoidal loading conditions.

Emphasis was placed on developing a simple, quick lifetime Cited by: 6. Sung R. Choi, Jonathan A. Salem, Cyclic fatigue of brittle materials with an indentation-induced flaw system, Materials Science and Engineering: A, /(95),1.

Note that, for the cyclic indentation of brittle materials, e.g. ceramics, most studies have been focused on the fatigue damage accumulation [30, 31], the strength degradation [32], and the crack.

Fig. 5 shows the results of cyclic fatigue testing for alumina and NCX34 silicon nitride determined previously at room and elevated temperatures, where σ max was plotted against ln t f based on Eq. for each material under given test conditions materials exhibited the decrease in time to failure with increasing maximum applied stress, indicative of susceptibility to SCG.

The characteristics of cyclic fatigue crack growth in a silicon nitride which hardly shows rising R-curve behavior were investigated by using specimens having an indentation-induced flaw.V-shaped behavior was observed in the relation between the maximum stress intensity factor K max and crack growth rate.

When a crack growth rate is plotted as a function of the effective maximum stress. Aspects of cyclic fatigue-crack propagation in monolithic and composite ceramics are described, with emphasis on the role of cyclic loading in degrading toughening, or crack-tip shielding, mechanisms in the crack wake.

relatively little is known about cyclic fatigue failure in these inherently brittle materials. In this paper, a brief. A study is made of the dynamic fatigue response of brittle materials containing indentation-induced line flaws.

The theoretical fracture mechanics of “median” crack evolution to failure under applied tension are first developed, with special emphasis on the role of residual contact stresses. In particular, it is shown that use of fatigue curves to evaluate the exponent in an assumed power. Abstract.

The mechanisms of fatigue-crack propagation are examined with particular emphasis on the similarities and differences between cyclic crack growth in ductile materials, such as metals, and corresponding behavior in brittle materials, such as intermetallics and ceramics.

This is achieved by considering the process of fatigue. Cyclic Fatigue of Intrinsically Brittle Ceramics in Contact With Spheres.

Cyclic Fatigue of Brittle Materials with an Indentation-Induced Flaw System. High Temperature Tension-Tension Cyclic Fatigue for a Hipped Silicon, Nitride,” Ceram. Eng. Sci. Cyclic Fatigue of Brittle Materials with an Indentation-Induced Flaw System,”“ Preloading Technique in Dynamic Fatigue Testing of Glass and Ceramics with an Indentation Flaw System,” J.

Ceram. Soc., 79, pp. In materials science, fatigue is the weakening of a material caused by cyclic loading that results in progressive and localized structural damage and the growth of cracks.

Once a fatigue crack has initiated, each loading cycle will grow the crack a small amount, typically producing striations on some parts of the fracture surface.

The crack will continue to grow until it reaches a critical. The results of the cyclic fatigue tests are shown in Fig. 3 in terms of the stress-life curve which correlates the maximum bending stress level (σ max) to the number of cycles to failure (N f).

Download: Download full-size image; Fig. Cyclic fatigue tests results of the ZrO 2. The static and cyclic fatigue behavior of sintered silicon nitride was investigated at room temperature.

with an indentation-induced flaw at the center, were tested under a static or cyclic. This article summarizes the understanding of the mechanisms and mechanical effects of fatigue processes in highly brittle materials, with particular emphasis on ceramics.

It provides a discussion on room-temperature fatigue crack growth in monolithic ceramics, transformation-toughened ceramics, and ceramic composites under cyclic compression.

Lawn's research works w citations reads, including: Novel Zirconia Materials in Dentistry. Ritter's research works with 1, citations and reads, including: Fatigue of Silane Bonded Epoxy/Glass Interfaces.

It took considerable time to nucleate from a machining mark between the spider arms. Once initiated propagation of the crack was rapid and accelerating as shown in the increased spacing of the 'beach marks' on the surface caused by the advancing fatigue crack.

bicycle crank spider arm.Affiliations. Cleveland State University,Cleveland, OH, USA. S. R. Choi; National Aeronautics and Space Administration, Lewis Research Center, JACerS is a leading source for top-quality basic science research and modeling spanning the diverse field of ceramic and glass materials science.

Residual contact stresses about indentation flaws are demonstrated to have a strong deleterious effect on specimen lifetime in static fatigue.