Fatigue crack propagation in aluminium alloy foams

Olurin, O.B.; McCullough, K.Y.G.; Fleck, N.A.; Ashby, Michael F.

doi:10.1016/s0142-1123(01)00010-x

Cited by 79 publications

(39 citation statements)

References 8 publications

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“…Actually, very high Paris law exponents were reported on Aluminium foams [11], as high as up to m = 25, although the base material of the foam was aluminium which in its bulk form has a Paris law exponent in the order of 2-4. The second is that the crack propagation can be density normalised in the same manner as static tensile data, and a generic Paris' law curve can be obtained for all densities within this class of materials.…”

Section: Crack Propagation Rate and Tensile Fatigue Testingmentioning

confidence: 99%

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Tension, compression and shear fatigue of a closed cell polymer foam

Zenkert

Burman

2009

Composites Science and Technology

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PostprintThis is the accepted version of a paper published in Composites Science And Technology. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. AbstractA closed cell foam of Polymetacrylimide (Rohacell) with three different densities is studied.The foam is tested quasistatically in tension, compression and shear. The tensile properties scale very well with the relative density of the foam, but the compression and shear properties do not scale the same way. It is believed to be due to cell edge and cell wall buckling being the dominated deformation mechanism in compression and shear for lower densities that does not occur for higher densities. Fatigue testing is then performed in tension, compression and shear. It is seen that for all load cases and densities, the fatigue life can be plotted using Basquin's law. The results also show that the different failure mechanisms found in the static tests are the same in fatigue. This means that the fatigue life for different load types exhibit different failure mechanisms. This shows not only as a clear difference in the stress levels for fatigue failure, but also on the slope in the fatigue life relation.

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Section: Crack Propagation Rate and Tensile Fatigue Testingmentioning

confidence: 99%

“…Olurin et al [11] performed crack propagation measurement on two closed cell aluminium foams. Shipsha et al [12,13] used both compact tension (CT) and cracked sandwich beams specimens to measure crack propagation rates in polymer foams.…”

Section: Introductionmentioning

confidence: 99%

Tension, compression and shear fatigue of a closed cell polymer foam

Zenkert

Burman

2009

Composites Science and Technology

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“…Firstly, we put the potting material and the test circuit module together to make them stuck and solidified as an entirety to prevent the PCB boards from damage in shock and vibration. Secondly, we cover the entirety with load shedding material such as spring and aluminum foam [10]. Therefore, the peak value of the overload on the test boards could be reduced.…”

Section: Anti-overload Technologiesmentioning

confidence: 99%

Research on the Testing Method of Projectile’s Interior Ballistics Parameters in Nose to Tail Loading State

Yu¹,

Kong²,

Shang³

et al. 2017

IJSIP

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“…While several analytic methods have been proposed to study the fatigue life of cellular structures (Cote et al, 2006;Côté et al, 2007a;Côté et al, 2007b;Huang and Liu, 2001a, b;Huang and Lin, 1996;Olurin et al, 2001), the majority fail to accurately capture the real stress distribution generated in the lattice cells (Simone and Gibson, 1998). To overcome this problem, more recently a fatigue design methodology has been introduced to model the elastic-plastic behavior of cellular materials, and used 4 to generate fatigue design diagrams for cellular materials (Abad et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Fatigue design of a mechanically biocompatible lattice for a proof-of-concept femoral stem

Khanoki

Pasini

2013

Journal of the Mechanical Behavior of Biomedical Materials

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A methodology is proposed to design a spatially periodic microarchitectured material for a twodimensional femoral implant under walking gait conditions. The material is composed of a graded lattice with controlled property distribution that minimizes concurrently bone resorption and interface failure. The periodic microstructure of the material is designed for fatigue fracture caused by cyclic loadings on the hip joint as a result of walking. The bulk material of the lattice is Ti6AL4V and its microstructure is assumed free of defects. The Soderberg diagram is used for the fatigue design under multiaxial loadings. Two cell topologies, square and Kagome, are chosen to obtain optimized property gradients for a two-dimensional implant. Asymptotic homogenization (AH) theory is used to address the multiscale mechanics of the implant as well as to capture the stress and strain distribution at both the macro and the microscale. The microstress distribution found with AH is also compared with that obtained from a detailed finite element analysis. For the maximum value of the von Mises stress, we observe a deviation of 18.6 % in unit cells close to the implant boundary, where the AH assumption of spatial periodicity of the fluctuating fields ceases to hold. In the second part of the paper, the metrics of bone resorption and interface shear stress are used to benchmark the graded cellular implant with existing prostheses made of fully dense titanium implant.The results show that the amount of initial postoperative bone loss for square and kagome lattice implants decreases, respectively, by 53.8% and 58%. In addition, the maximum shear interface failure at the distal end is significantly reduced by about 79%.A set of proof-of-concepts of planar implants have been fabricated via Electron Beam Melting (EBM) to demonstrate the manufacturability of Ti6AL4V into graded lattices with alternative cell size. Optical microscopy has been used to measure the morphological parameters of the cellular microstructure, including cell wall thickness and pore size, and compared them with the nominal values. No sign of fracture or incomplete cell walls was observed, an assessment that shows the satisfactory metallurgical bond of cell walls and the structural integrity of the implants.

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Fatigue crack propagation in aluminium alloy foams

Cited by 79 publications

References 8 publications

Tension, compression and shear fatigue of a closed cell polymer foam

Tension, compression and shear fatigue of a closed cell polymer foam

Research on the Testing Method of Projectile’s Interior Ballistics Parameters in Nose to Tail Loading State

Fatigue design of a mechanically biocompatible lattice for a proof-of-concept femoral stem

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