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1

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Can acoustic emission detect the initiation of fatigue cracks: Application to high-strength light alloys used in aeronautics (1978)

Bathias, C. ; Sertour, G. ; Brinet, B.

In: CASI

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Publikationsdatum: 2019-08-28

Beschreibung: Acoustic emission was used for the detection of fatigue cracking in a number of high-strength light alloys used in aeronautical structures. Among the features studied were: the influence of emission frequency, the effect of surface oxidation, and the influence of grains. It was concluded that acoustic emission is an effective nondestructive technique for evaluating the initiation of fatigue cracking in such materials.

Schlagwort(e): STRUCTURAL MECHANICS

Materialart: NASA-TM-75306

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2

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Accommodating and cracking mechanisms in low-cycle fatigue (1978)

Pineau, A.

In: CASI

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Publikationsdatum: 2019-08-28

Beschreibung: The three main stages of fatigue life (accommodation, crack initiation and crack growth) are briefly reviewed. The cyclic behavior of annealed or predeformed face-centered cubic metals is described. Moreover, two types of alloys (Al-4-Cu and WASPALOY) are examined regarding the influence of the interactions between the precipitates and the dislocations on the cyclic behavior. Data on the percent of life to crack initiation (for a microcrack smaller than about 100 microns) are also given. Finally, experimental and theoretical results on crack growth rates in lowcycle fatigue are described.

Schlagwort(e): STRUCTURAL MECHANICS

Materialart: NASA-TM-75227

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3

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Different aspects of low-cycle fatigue (1978)

Bathias, C.

In: CASI

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Publikationsdatum: 2019-08-28

Beschreibung: The experimental and theoretical knowledge in this field is presented. The different relations which correlate the number of cyles to rupture with strain or strain-energy are given. The application of low-cycle fatigue concepts to the crack initiation and crack propagation are briefly studied.

Schlagwort(e): STRUCTURAL MECHANICS

Materialart: NASA-TM-75226

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4

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The NASTRAN Theoretical Manual, Level 17.5 (1978)

In: Other Sources

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Publikationsdatum: 2019-08-28

Beschreibung: No abstract available

Schlagwort(e): STRUCTURAL MECHANICS

Materialart: NASA-SP-221(05)

Format: text

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5

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Manned Space Flight (1962)

Holmes, Brainerd

In: Other Sources

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Publikationsdatum: 2019-08-28

Beschreibung: Nasa manned space flight programs - mercury, one- day missions, gemini, and apollo

Schlagwort(e): STRUCTURAL MECHANICS

Materialart: The AIBS Bulletin. Special Space-Biology Issue; XII; 5; 56-59

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6

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Study on prestressed concrete reactor vessel structures. II-5: Crack analysis by three dimensional finite elements method of 1/20 multicavity type PCRV subjected to internal pressure (1978)

In: CASI

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Publikationsdatum: 2019-08-27

Beschreibung: A three-dimensional finite elements analysis is reported of the nonlinear behavior of PCRV subjected to internal pressure by comparing calculated results with test results. As the first stage, an analysis considering the nonlinearity of cracking in concrete was attempted. As a result, it is found possible to make an analysis up to three times the design pressure (50 kg/sqcm), and calculated results agree well with test results.

Schlagwort(e): STRUCTURAL MECHANICS

Materialart: NASA-TM-75213

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7

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Low-cycle fatigue testing methods (1978)

Lieurade, H. P.

In: CASI

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Publikationsdatum: 2019-08-27

Beschreibung: The good design of highly stressed mechanical components requires accurate knowledge of the service behavior of materials. The main methods for solving the problems of designers are: determination of the mechanical properties of the material after cyclic stabilization; plotting of resistance to plastic deformation curves; effect of temperature on the life on low cycle fatigue; and simulation of notched parts behavior.

Schlagwort(e): STRUCTURAL MECHANICS

Materialart: NASA-TM-75228

Format: application/pdf

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