Procedures for Damping Properties Determination in Metal Foams to Improve FEM Modeling

Goletti, Massimo; Mussi, Valerio; Rossi, Andrea; Monno, Michele

doi:10.1016/j.mspro.2014.07.611

Cited by 11 publications

(6 citation statements)

References 4 publications

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“…However, the 2nd frequencies output results have been shown varied responses that were particular for each test. The damping ratios for the 1st natural frequencies of all specimens were found to be more than three times of the results which are presented by Golleti et al [33] as well as Banhart [41], where the specimens (aluminium foams) have been shaped with the similar conditions to our work, clamped in the middle (similar to 500D) and at the end (290D) respectively. This seems to highlight a major sensitivity of steel foams over aluminium foams to solid intrusions.…”

Section: Discussionsupporting

confidence: 82%

“…The mesh was formed by 1020 Elements (1900 Elements for the specimen 500D) and 756 nodes (1404 nodes for the specimen 500D) to have a relevant deformation control. Both harmonic and modal analyses were performed on the models, iteratively, to update and calibrate the values of the damping ratio [33,34]. This was done accordingly to the model updating procedure described in [35] and more recently applied in [36,37].…”

Section: Fe Modeling and Model Calibrationmentioning

confidence: 99%

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Experimental estimation of the damping ratio of metallic foam sandwich panels with sand intrusions

Farhadi¹,

Civera²

2021

J. vibroeng.

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The interest to use steel foam sandwich structures is expanding in various industrial applications, and more attention is paid to improve the properties of these materials. However, liquid and solid intrusions can severely hamper their useful characteristics. This study aims to provide an experimental investigation on the potential of steel foam (hollow sphere) sandwich specimens to operate as passive dampers in flexural vibration and to preserve their capabilities when affected by the intrusion of external particles. The authors utilized two different experimental examinations, random noise (white noise) and impact (hammer) tests. The specimens consist of a hollow sphere foam core sandwiched between two mild steel sheets, bonded with a thermosetting epoxy resin. To simulate the intrusions of granular materials in operating conditions, the metallic foam cores of the samples were partially filled with different percentages of quartz sand particles. The two-phase specimens were then compared to the pristine (single-phase) ones. The resulting estimates of the vibrational damping ratio for single and double-phase metallic foam specimens were used to calibrate the respective Finite Element models, which proved to be suitable for replicating the damping characteristics of the specimens.

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Section: Discussionsupporting

confidence: 82%

Section: Fe Modeling and Model Calibrationmentioning

confidence: 99%

Experimental estimation of the damping ratio of metallic foam sandwich panels with sand intrusions

Farhadi¹,

Civera²

2021

J. vibroeng.

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“…In most experimental cases, the half power bandwidth technique is used to identify damping coefficients. This technique belongs to the category of single degree-of-freedom (SDOF) methods, which are based on the one degree of freedom system, modeled by mass-springdamper system, but half power bandwidth method may be affected by not negligible errors, due to poor frequency resolution (see [3]). In the current research work, in order to avoid the abovementioned estimation errors, the circle fit method is used for the damping estimation [7].…”

Section: Experimental Testsmentioning

confidence: 99%

“…Goletti et al [3] proposed an industrial-level experimental procedure to estimate material damping of metal foams, in terms of damping ratio parameter. Then, they replicated the test by a FEM model, in which the experimental damping ratio values were used.…”

Section: Introductionmentioning

confidence: 99%

Effect of metal foam on vibration damping and its modelling

Albertelli

Esposito

Mussi³

et al. 2021

Int J Adv Manuf Technol

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The use of metal foams for damping vibrations of mechanical structures has found interesting applications in machine tools and its components. Indeed, undesired vibration is one of the most detrimental causes that limit the machine performance in terms of the maximum achievable material removal rate MRR. Although positive results were presented in some research works, a methodology for predicting the damping properties of such materials in the machine tool design phase using finite element codes is still missing. In order to bridge this gap, in this paper, an experimental procedure for identifying the damping contribution of the aluminum metal foam to the hosting structure is proposed. The experimental data are even used to develop a model for predicting the damping. The procedure is further validated on a dummy structure.

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“…In particular, dynamic problems, such as modal analysis [1,2], impact tests [3,4], and fatigue analyses [5,6], are quite sensitive to boundary conditions and material parameters. The most common causes of differences in model behavior may be constraint stiffness and structural damping [7,8]. Computational models are usually verified by correlating the results of numerical calculation and experimental measurement.…”

Section: Introductionmentioning

confidence: 99%

Stiffness Estimation and Equivalence of Boundary Conditions in FEM Models

et al. 2021

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The paper deals with methods of equivalence of boundary conditions in finite element models that are based on finite element model updating technique. The proposed methods are based on the determination of the stiffness parameters in the section plate or region, where the boundary condition or the removed part of the model is replaced by the bushing connector. Two methods for determining its elastic properties are described. In the first case, the stiffness coefficients are determined by a series of static finite element analyses that are used to obtain the response of the removed part to the six basic types of loads. The second method is a combination of experimental and numerical approaches. The natural frequencies obtained by the measurement are used in finite element (FE) optimization, in which the response of the model is tuned by changing the stiffness coefficients of the bushing. Both methods provide a good estimate of the stiffness at the region where the model is replaced by an equivalent boundary condition. This increases the accuracy of the numerical model and also saves computational time and capacity due to element reduction.

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Procedures for Damping Properties Determination in Metal Foams to Improve FEM Modeling

Cited by 11 publications

References 4 publications

Experimental estimation of the damping ratio of metallic foam sandwich panels with sand intrusions

Experimental estimation of the damping ratio of metallic foam sandwich panels with sand intrusions

Effect of metal foam on vibration damping and its modelling

Stiffness Estimation and Equivalence of Boundary Conditions in FEM Models

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