Quasi-Static and Dynamic Behavior of Inconel 625 Obtained by Laser Metal Deposition: Experimental Characterization and Constitutive Modeling

Utzeri, Mattia; Bhagavatam, Ajay; Mancini, Edoardo; Dinda, G.P.; Sasso, M.; Newaz, Golam

doi:10.1115/1.4051087

Cited by 8 publications

(7 citation statements)

References 36 publications

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“…Subsequently, the best failure criterion was determined. Several failure criteria were evaluated, such as Von Mises, Desphande-Fleck, Gibson, Raghava and GATZT [12,22]. Among them, Raghava criterion revealed to be the best one because it takes into account the different failure stresses in compression and tensile condition, i.e.…”

Section: Methodsmentioning

confidence: 99%

Influence of Core Cellular Structures on Collapse Mechanisms Maps of Sandwich Beams

Utzeri

Morichelli

Lattanzi

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The main advantage of 3D printing is manufacturing complex and innovative shapes which guarantee high mechanical properties. Therefore, it is necessary easily figure out the most suitable structure for the required design requirements. The well-known strategy to design sandwich panels is evaluating collapse maps as they determine the panel performances based on their geometrical features. The aim of this study is to update the traditional collapse maps by showing how the core shape can improve the sandwich beam performance. The collapse maps proposed are based on advanced analytical models than the traditional Gibson theories. The analytical modelling of the indentation phenomenon is based on Vlasov’s model. The analytical modelling of the bending phenomenon is based on the First Shear Order Theory. The overall panel stress and strain maps are computed superposing both effects. A composite sandwich panels with Gyroid core based are analyzed to verify the proposed model consistency. A core failure criterion is chosen by experimental testing evidence on the representative core structure. Once the computed stress state overtakes failure criterion ones, the critical load is defined. In the end, the model is exploited to compare the performances of four sandwich panels with cores based on different lattice structures.

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Section: Methodsmentioning

confidence: 99%

Influence of Core Cellular Structures on Collapse Mechanisms Maps of Sandwich Beams

Utzeri

Morichelli

Lattanzi

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…First of all, the backbone curve of the first three modes are computed by means of Eqn. (24). The Fig.…”

Section: Analytical Findingsmentioning

confidence: 99%

“…Here prime means derivative with respect to  , and  is the rotation (equal to the beam slope, since we are considering an Euler-Bernoulli beam) [24],…”

Section: Multi-modal Nonlinear Responsementioning

confidence: 99%

“…Starting from the Eqn. (24) and the assumption of first vibration response, the impact time is defined as (36) Fig. (8) shows how the adimensional impact duration depends by the mass ratio  .…”

Section: Analytical Findingsmentioning

confidence: 99%

“…24) is the analytical expression of the backbone curve, approximated up to the fifth order. Considering only the first term in Eqn.…”

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confidence: 99%

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Modelling of Low-velocity Impacts on Composite Beams in Large Displacement

Utzeri

Sasso

Chiappini

et al. 2021

Frattura Ed Integrità Strutturale

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The paper provides an evaluation of the nonlinear dynamic response of a cantilever beam made of composite material subjected to low-velocity impacts. The structure is assumed to respond in a quasi-static manner and modelled by a continuous beam in large displacement with a lumped mass attached. First, an analytical model was developed to study the free vibrations of a beam, taking into account the nonlinearities due to large displacements and inertia. Then, the analytical findings were compared with experimental test data. The vibration of a real composite beam has been acquired through high-speed imaging technique. The displacements of the beam were extracted by digital image analysis; then, the nonlinear parameters of the analytical model were determined by the Fitting Time History technique. The results obtained by the analytical model and the experimental test are compared with numerical analysis. The validated analytical model was adapted to study a low-velocity impact; the lumped mass was associated with a rigid projectile, whose initial speed represents the impact velocity.

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