Experimental validation of simulated fatigue life estimates in laser‐peened aluminum

Spradlin, Thomas J.; Grandhi, Ramana V.; Langer, Kristina

doi:10.1108/17579861111108635

Cited by 17 publications

(12 citation statements)

References 11 publications

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“…Stressbased criteria are regularly used to investigate high cycle fatigue, in which the applied stress amplitude is less than the yield strength of the material [17]. Strain life estimations can be used across the entire fatigue spectrum, from low-cycle fatigue to high-cycle fatigue, which makes it an excellent method to study fatigue properties [18][19][20]. The sharp corners near connective knots of lattice materials will cause stress concentration and the severe stress concentration will cause plastic strain, so the plot of the fatigue life versus the strain amplitude is specific, which can be used to predict the fatigue life of lattice structures.…”

Section: Assumption and Methodologymentioning

confidence: 99%

Fatigue of thin periodic triangular lattice plates

Shterenlikht

Pavier

et al. 2019

MATEC Web Conf.

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A method for predicting the fatigue life of triangular lattices is proposed in this paper by considering fatigue properties of single lattice struts. Fatigue tests of different sizes of lattice plates of aluminium alloy, and tests of single struts with different maximum fluctuating loads, have been conducted to validate this method. It is found that the struts in a triangular lattice break near to strut intersections, where stress and strain concentrations occur. Similar crack propagation paths were observed in different lattice plate specimens: the cracks grew at a 30° angle to the initial edge crack in the upper half of lattice plate. The mixed-mode fatigue crack propagation rate was also studied and expressed using an effective stress intensity factor. A size effect on the crack growth rate of triangular lattice plates was also observed: a fatigue crack will propagate slightly quicker in larger triangular plates than in smaller ones.

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Section: Assumption and Methodologymentioning

confidence: 99%

Fatigue of thin periodic triangular lattice plates

Shterenlikht

Pavier

et al. 2019

MATEC Web Conf.

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“…The commercial finite element package ABAQUS [27] was used to solve for the stresses, strains, and displacements that result from the application of laser peening on thin sheets of Al2024-T351. Based on previous work [11,25,[30][31][32][33], all simulations were run using explicit time integration (ABAQUS/Explicit) to solve the dynamic system. As discussed in [25], using an explicit solver to model both the impact event and the subsequent return to equilibrium is quicker, more scalable, and uses less memory than performing the equilibrium analysis with an implicit solver.…”

Section: Computational Modelmentioning

confidence: 99%

Finite Element Analysis of Laser Peening of Thin Aluminum Structures

Langer

Spradlin

Fitzpatrick

2020

Metals

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Laser shock peening has become a commonly applied industrial surface treatment, particularly for high-strength steel and titanium components. Effective application to aluminum alloys, especially in the thin sections common in aerospace structures, has proved more challenging. Previous work has shown that some peening conditions can introduce at-surface tensile residual stress in thin Al sections. In this study, we employ finite element modeling to identify the conditions that cause this to occur, and show how these adverse effects can be mitigated through selection of peen parameters and patterning.

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“…In this work, LSP is assumed to be a purely mechanical process, so the increase in temperature in the substrate material is negligible. This assumption is also presented in various pieces of literature [26,27]. Thus, the temperature softening effect in the J–C model was not considered.…”

Section: Fem Simulation and Proceduresmentioning

confidence: 99%

Simulation and Experimental Study on Residual Stress Distribution in Titanium Alloy Treated by Laser Shock Peening with Flat-Top and Gaussian Laser Beams

Luo

et al. 2019

Materials

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The residual stress introduced by laser shock peening (LSP) is one of the most important factors in improving metallic fatigue life. The shock wave pressure has considerable influence on residual stress distribution, which is affected by the distribution of laser energy. In this work, a titanium alloy is treated by LSP with flat-top and Gaussian laser beams, and the effects of spatial energy distribution on residual stress are investigated. Firstly, a 3D finite element model (FEM) is developed to predict residual stress with different spatial energy distribution, and the predicted residual stress is validated by experimental data. Secondly, three kinds of pulse energies, 3 J, 4 J and 5 J, are chosen to study the difference of residual stress introduced by flat-top and Gaussian laser beams. Lastly, the effect mechanism of spatial energy distribution on residual stress is revealed.

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Experimental validation of simulated fatigue life estimates in laser‐peened aluminum

Cited by 17 publications

References 11 publications

Fatigue of thin periodic triangular lattice plates

Fatigue of thin periodic triangular lattice plates

Finite Element Analysis of Laser Peening of Thin Aluminum Structures

Simulation and Experimental Study on Residual Stress Distribution in Titanium Alloy Treated by Laser Shock Peening with Flat-Top and Gaussian Laser Beams

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