Failure mechanisms of closed-cell aluminum foam under monotonic and cyclic loading

Amsterdam, Emiel; Hosson, J.Th.M. De; Onck, Patrick

doi:10.1016/j.actamat.2006.05.033

Cited by 73 publications

(63 citation statements)

References 18 publications

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“…For closed-cell or open-cell aluminum foams, the fatigue properties were investigated. [14][15][16][17][18][19] However, the fatigue properties of lotus metals have not been clarified in detail compared with those of aluminum foams; Seki et al clarified the effect of porosity, anisotropic pore structure, and pore size distribution on the fatigue strength of lotus copper. 13) In order to discuss the fatigue fracture mechanism of lotus metals, it is necessary to clarify the fatigue crack initiation and propagation.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Initiation and Propagation in Lotus-Type Porous Copper

2008

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We studied fatigue crack initiation and propagation in lotus-type porous copper with cylindrical pores aligned in one direction. For fatigue loadings in the direction parallel to the longitudinal axis of pores, stress field in the matrix is homogeneous. Therefore, slip bands are formed all over the specimen surface. On the other hand, for the perpendicular loadings, slip bands are formed only around pores in which stress highly concentrates. Since the localized slip bands form fatigue crack, fatigue fracture occurs even when the total plastic strain range is small. Stress field in the matrix of lotus copper affects the direction of crack propagation. For the parallel loadings, a crack propagates along a straight line as well as nonporous copper. On the other hand, for the perpendicular loading, a crack propagates along a path in which stress highly concentrates. Since stress highly concentrates around anomalously large pores, fatigue cracks are preferentially formed around the large pores and cracks propagate by crossing the large pores.

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Section: Introductionmentioning

confidence: 99%

Fatigue Crack Initiation and Propagation in Lotus-Type Porous Copper

2008

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“…The lower limit of ݇ was chosen according to preliminary measurements that resulted in no damage, while the ܴ asymmetry factor was selected based on the literature [2,4,5,9,10,18] to obtain comparable data. The plateau stress of the foams, i.e.…”

Section: Fig 1 (A)mentioning

confidence: 99%

“…Some research compared the response of the foams in different loading conditions [17][18][19]. The majority of these fatigue studies has addressed Alporas [1,4,10,14,18,20] and Alulight closed cell foams [19,21], Doucel open cell foam [2,3,18], and other low density closed cell foams produced with gas releasing agents [5,8,12,15,16].…”

Section: Introductionmentioning

confidence: 99%

“…However, the research on the mechanical properties of the metallic foams has been focused prominently on uni-axial compressive loading. There are few studies investigating the cyclic loading of metallic foams in compression-compression [2][3][4][5][6][7][8][9], tension-tension [10][11][12][13], or tension-compression [1,[14][15][16] conditions. Some research compared the response of the foams in different loading conditions [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Fatigue properties of expanded perlite/aluminum syntactic foams

Taherishargh

Katona

Fiedler

et al. 2016

Journal of Composite Materials

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Abstract:The main purpose of this paper is to present the basic fatigue properties of metal matrix syntactic foams (P-MSFs). The investigated syntactic foams consisting of expanded perlite and A356 aluminum matrix were produced using an inert gas pressure infiltration technique. The obtained foams were subjected to cyclic compressive loading in order to investigate their fatigue properties. The standard procedure for cyclic fatigue testing was slightly modified to account for the variation of porosity and strength which is typical for metallic foam samples. This approach allows the direct comparison of the fatigue test results between all investigated samples. Depending on the applied load level, two different failure mechanisms were identified that resulted in characteristic deformation -loading cycle curves. The failure mechanisms were further investigated on the microstructural scale: traces of fatigue beachmarks and extensive plastic deformation were found. Furthermore, Wöhler-like deformation -lifetime diagrams were created in order to predict the expected lifetime of the P-MSFs.http://mc.manuscriptcentral.com/jcm AbstractThe main purpose of this paper is to present the basic fatigue properties of metal matrix syntactic foams (P-MSFs). The investigated syntactic foams consisting of expanded perlite and A356 aluminum matrix were produced using an inert gas pressure infiltration technique. The obtained foams were subjected to cyclic compressive loading in order to investigate their fatigue properties. The standard procedure for cyclic fatigue testing was slightly modified to account for the variation of porosity and strength which is typical for metallic foam samples. This approach allows the direct comparison of the were created in order to predict the expected lifetime of the P-MSFs.

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“…The digital image correlation that was used for the tanking test was a commercial system which had previously been used to validate LS-DYNA models of foam impact on the Orbiter wing reinforced carbon-carbon panels during the Columbia Return to Flight program [3][4][5]. Three dimensional digital image correlation has been successfully used to capture motion in a wide range of research areas from material characterization tests [6][7][8][9] to structural tests [10][11][12], to biomechanics [13][14][15][16].…”

Section: Fig 1 Cracks In the Et Foam At The Lo2 Flange On Panel 2 Dumentioning

confidence: 99%

Photogrammetry Measurements During a Tanking Test on the Space Shuttle External Tank, ET-137

Littell

Schmidt

Tyson

et al. 2012

Conference Proceedings of the Society for Experimental Mechanics Series

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On November 5, 2010, a significant foam liberation threat was observed as the Space Shuttle STS-133 launch effort was scrubbed because of a hydrogen leak at the ground umbilical carrier plate. Further investigation revealed the presence of multiple cracks at the tops of stringers in the intertank region of the Space Shuttle External Tank. As part of an instrumented tanking test conducted on December 17, 2010, a three dimensional digital image correlation photogrammetry system was used to measure radial deflections and overall deformations of a section of the intertank region. This paper will describe the experimental challenges that were overcome in order to implement the photogrammetry measurements for the tanking test in support of STS-133. The technique consisted of configuring and installing two pairs of custom stereo camera bars containing calibrated cameras on the 215-ft level of the fixed service structure of Launch Pad 39-A. The cameras were remotely operated from the Launch Control Center 3.5 miles away during the 8 hour duration test, which began before sunrise and lasted through sunset.The complete deformation time history was successfully computed from the acquired images and would prove to play a crucial role in the computer modeling validation efforts supporting the successful completion of the root cause analysis of the cracked stringer problem by the Space Shuttle Program. The resulting data generated included full field fringe plots, data extraction time history analysis, section line spatial analyses and differential stringer peak-valley motion. Some of the sample results are included with discussion. The resulting data showed that new stringer crack formation did not occur for the panel examined, and that large amounts of displacement in the external tank occurred because of the loads derived from its filling. The measurements acquired were also used to validate computer modeling efforts completed by NASA Marshall Space Flight Center (MSFC). Background

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Failure mechanisms of closed-cell aluminum foam under monotonic and cyclic loading

Cited by 73 publications

References 18 publications

Fatigue Crack Initiation and Propagation in Lotus-Type Porous Copper

Fatigue Crack Initiation and Propagation in Lotus-Type Porous Copper

Fatigue properties of expanded perlite/aluminum syntactic foams

Photogrammetry Measurements During a Tanking Test on the Space Shuttle External Tank, ET-137

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