Fatigue Design Curves for 6061-T6 Aluminum

Yahr, G.T.

doi:10.1115/1.2842286

Cited by 36 publications

(15 citation statements)

References 5 publications

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“…where W p is the cyclic plastic energy determined by Morrow's cyclic plastic energy dissipation formula given below (Marrow, 1965;Halford, 1966): Table 2 (Wong, 1984;Socie, 1987;Lin et al, 1992;Yahr, 1997;Meneghetti, 2007). In processes involving low-cycle fatigue, the entropy generation due to plastic deformation is dominant and the entropy generation due to heat conduction is negligible.…”

Section: Entropy Lawmentioning

confidence: 99%

An experimental approach to low-cycle fatigue damage based on thermodynamic entropy

Naderi

Khonsari

2010

International Journal of Solids and Structures

103

101

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a b s t r a c tThis paper presents an experimental approach to fatigue damage in metals based on thermodynamic theory of irreversible process. Fatigue damage is an irreversible progression of cyclic plastic strain energy that reaches its critical value at the onset of fracture. In this work, irreversible cyclic plastic energy in terms of entropy generation is utilized to experimentally determine the degradation of different specimens subjected to low cyclic bending, tension-compression, and torsional fatigue. Experimental results show that the cyclic energy dissipation in the form of thermodynamic entropy can be effectively utilized to determine the fatigue damage evolution. An experimental relation between entropy generation and damage variable is developed.

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Section: Entropy Lawmentioning

confidence: 99%

An experimental approach to low-cycle fatigue damage based on thermodynamic entropy

Naderi

Khonsari

2010

International Journal of Solids and Structures

103

101

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“…2 clearly display the differences in the 7075-T73 samples with/without anodization treatment in terms of the changes in high-cycle fatigue life (>10 5 cycles). Yhar 25) applied the following equation to get a best fit on S-N curve of aluminum alloy.…”

Section: S-n Curves Of Different Samplesmentioning

confidence: 99%

The Effects of Anodization Treatment on the Microstructure and Fatigue Behavior of 7075-T73 Aluminum Alloy

Shih

Lee

2014

Mater. Trans.

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The fatigue behaviors of 7075-T73 alloy with/without anodization/sealing treatment were investigated in this study. The microstructure of different samples was analyzed by electron microscopy. As the experiments, the microstructure were observed from the anodized/sealed samples to indicate that precipitates trapped at subsurface near film/metal (f/m) interface would partly dissolved and the deformed matrix existed high fractions of high angle grain boundaries. The bare 7075-T73 alloy samples achieved fatigue strength of 225 MPa and the anodized/sealed samples enhanced their fatigue strength at 10 7 life cycles with 1020 µm film thickness. The fractured anodized/sealed sample showed fine striation spacing than bare sample after subjected to low stress amplitude.

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“…20 For 200 MPa, the fatigue strength of 6061-T6 aluminum suggests a usable lifetime of 20,000 cycles. 21 Normal operation of the MCSF is not expected to cycle over the full range, so we expect the actual lifetime to be greater than 10 years for typical observations on SOFIA. …”

Section: Monolithic Flexure Designmentioning

confidence: 99%

A miniature cryogenic scanning Fabry-Perot interferometer for mid-IR to submm astronomical observations

et al. 2014

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We have designed and evaluated a Miniature Cryogenic Scanning Fabry-Perot (MCSF) interferometer which can be inserted into the optical path of a mid-IR camera to observe fine structure lines in the 25-40 µm wavelength regime. The MCSF uses free standing metal meshes as its filters and can scan over a length of ~2 mm. The short wavelength range in which the MCSF will be used requires very tight fabrication tolerances to maintain the parallelism of the meshes to within 0.15 µm and to obviate the need for dynamic parallelizing adjusters. A monolithic notch flexure design delivers these properties and minimizes the number of moving parts, maximizing reliability. The scanning mechanism includes a cryogenic stepper motor that drives a miniature fine-adjustment screw via a worm gear assembly. This allows for a step resolution of 1 step ~ 14 nm when operating in full step mode. Finite Element Analysis of the MCSF's monolithic flexure guided the design and confirmed that the MCSF will remain within required limits over the course of operation. We developed the MCSF for use in the mid-IR camera FORCAST on the 2.5 meter SOFIA telescope.

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Fatigue Design Curves for 6061-T6 Aluminum

Cited by 36 publications

References 5 publications

An experimental approach to low-cycle fatigue damage based on thermodynamic entropy

An experimental approach to low-cycle fatigue damage based on thermodynamic entropy

The Effects of Anodization Treatment on the Microstructure and Fatigue Behavior of 7075-T73 Aluminum Alloy

A miniature cryogenic scanning Fabry-Perot interferometer for mid-IR to submm astronomical observations

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