Dynamic plastic response of double-layered circular metallic plates due to localized impulsive loading

Rezasefat, Mohammad; Mostofi, Tohid Mirzababaie; Babaei, Hashem; Ziya-Shamami, M.; Alitavoli, M.

doi:10.1177/1464420718760640

Cited by 8 publications

(3 citation statements)

References 63 publications

(133 reference statements)

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“…FEM has proven to be a valuable method for analysing the mechanical behaviour and performance of materials such as metals [20,[56][57][58] and composites [59][60][61][62] under mechanical loads; therefore, it was used here to generate the dataset for the ML model. Figure 1a shows the 3D CAD model of the compression-shear specimen that was used to perform FEM using the Abaqus/Standard commercial solver [63].…”

Section: Finite Element Modelmentioning

confidence: 99%

Machine Learning-Assisted Characterization of Pore-Induced Variability in Mechanical Response of Additively Manufactured Components

Rezasefat,

Hogan

2023

Modelling

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Manufacturing defects, such as porosity and inclusions, can significantly compromise the structural integrity and performance of additively manufactured parts by acting as stress concentrators and potential initiation sites for failure. This paper investigates the effects of pore system morphology (number of pores, total volume, volume fraction, and standard deviation of size of pores) on the material response of additively manufactured Ti6Al4V specimens under a shear–compression stress state. An automatic approach for finite element simulations, using the J2 plasticity model, was utilized on a shear–compression specimen with artificial pores of varying characteristics to generate the dataset. An artificial neural network (ANN) surrogate model was developed to predict peak force and failure displacement of specimens with different pore attributes. The ANN demonstrated effective prediction capabilities, offering insights into the importance of individual input variables on mechanical performance of additively manufactured parts. Additionally, a sensitivity analysis using the Garson equation was performed to identify the most influential parameters affecting the material’s behaviour. It was observed that materials with more uniform pore sizes exhibit better mechanical properties than those with a wider size distribution. Overall, the study contributes to a better understanding of the interplay between pore characteristics and material response, providing better defect-aware design and property–porosity linkage in additive manufacturing processes.

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Section: Finite Element Modelmentioning

confidence: 99%

Machine Learning-Assisted Characterization of Pore-Induced Variability in Mechanical Response of Additively Manufactured Components

Rezasefat,

Hogan

2023

Modelling

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“…The 1 mm × 1 mm mesh area was chosen based on the mesh sensitivity analysis performed in [29]. The laminates were plates between two rigid rectangular clamps and a penalty based contact with the friction coefficient of 0.9 was defined between the laminate and the camps to reproduce the experimental boundary conditions, to avoid out-of-plane movement, and to reduce the slip at the boundary [27,[45][46][47]. The interface of the composite plies was simulated by implementing zero thickness cohesive elements (COH3D8) at the interface of each two plies which resulted in 23 layers of cohesive interface elements.…”

Section: Finite Element Simulationmentioning

confidence: 99%

Numerical Investigation of the Effect of Open Holes on the Impact Response of CFRP Laminates

2022

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The presence of open holes changes the behaviour of composite laminates when subjected to mechanical loads creating critical zones with a high probability of interlaminar and intralaminar damage initiation. While open holes in composite laminates are a requirement in many situations such as assembly needs, wiring, and maintenance access, their influence on the impact response of composite laminates is still poorly understood. In this paper, a numerical study was performed on Carbon Fibre Reinforced Polymer (CFRP) composite laminates with open holes subjected to low velocity impacts. The influence of the distance between open holes to impact origin, hole diameter, and the number of open holes on mechanical response and failure was studied using a FE model based on the inter-fibre failure criterion of Cuntze to account for the progressive intralaminar failure. The interlaminar failure was considered by using zero thickness cohesive elements based on the cohesive zone model. The results showed that i) open holes change the shape and size of the damage caused by low velocity impact and ii) that the presence of an open hole close to the impact origin in-plane spread of damage is stopped resulting in more severe damage and a smaller projected damage area compared to the control specimen. In addition, the presence of open holes in most cases did not change the locality of the low velocity impact but rather changed the severity of the damage in the local impact zone.

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“…For solving the equation, singular value decomposition approach is used. [29][30][31][32][33][34][35] Acquiring the unknown coefficients required to transform the experimental data into a dimensionless analysis. A simple model for the center of mass deflection of triangular clamped plates subjected to drop hammer is derived by using SVD.…”

Section: Nondimensional Analysismentioning

confidence: 99%

Experimental and empirical study of large transverse deformation of triangular plates subjected to water hammer shock loading

Haghgoo¹,

Rezasefat²,

Mahmoudi³

et al. 2019

Proceedings of the IMechE

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In this paper, the dynamic plastic response of isosceles triangular plates under hydrodynamic loads was investigated experimentally using a drop hammer machine. To do this, a series of experimental tests were carried out on mild steel triangular plates with different thicknesses to bring insight into the effect of geometry and mechanical properties of the plate on the deformation of specimens, which were impacted by a piston-induced pressure wave inside a water tube. The effects of various impact loads originated from different drop hammer standoff distances, and hammer weights concerning variations of deflection of the center of mass were described. The experimental results were presented in terms of deflection of the center of mass of the plates and deflection profiles. The experimental results showed that the plate with lower thickness experienced higher deflection-to-thickness ratio. An empirical model was also proposed based on new dimensionless numbers for triangular plates in order to predict the ratio of deflection of the center of mass to thickness. The dimensionless numbers considered the effects of plate geometry, hydrodynamic applied load, and mechanical properties of materials. Comparison between the experimental results and empirical predictions demonstrated that the suggested model is accurate enough to predict of the response of isosceles triangular plates under hydrodynamic loads.

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Dynamic plastic response of double-layered circular metallic plates due to localized impulsive loading

Cited by 8 publications

References 63 publications

Machine Learning-Assisted Characterization of Pore-Induced Variability in Mechanical Response of Additively Manufactured Components

Machine Learning-Assisted Characterization of Pore-Induced Variability in Mechanical Response of Additively Manufactured Components

Numerical Investigation of the Effect of Open Holes on the Impact Response of CFRP Laminates

Experimental and empirical study of large transverse deformation of triangular plates subjected to water hammer shock loading

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