Experimental analyses of the poly(vinyl chloride) foams' mechanical anisotropic behavior

Tita, Volnei; Júnior, Mauricio Francisco Caliri; Angélico, Ricardo Afonso; Canto, Rodrigo Bresciani

doi:10.1002/pen.23222

Cited by 17 publications

(20 citation statements)

References 19 publications

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“…al. [49], as shown in Table 2. Based on the experimental data, one has E = 16.0 GPa, E = 32.0 GPa, ν = 0.29, ν = 0.28, and G = 15.0 GPa, and the elastic stiffness matrix, E, reads: …”

Section: Elastic Microplane Model Formulation For Rigid Polymeric Foamsmentioning

confidence: 92%

Elastic Microplane Formulation for Transversely Isotropic Materials

Jin

Salviato

et al. 2016

Journal of Applied Mechanics

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This contribution investigates the extension of the microplane formulation to the description of transversely isotropic materials such as shale rock, foams, unidirectional composites, and ceramics. Two possible approaches are considered: 1) the spectral decomposition of the stiffness tensor to define the microplane constitutive laws in terms of energetically orthogonal eigenstrains and eigenstresses; and 2) the definition of orientationdependent microplane elastic moduli. It is shown that the first approach provides a rigorous way to tackle anisotropy within the microplane framework whereas the second approach represents an approximation which, however, makes the formulation of nonlinear constitutive equations much simpler. The efficacy of the second approach in modeling the macroscopic elastic behavior is compared to the thermodynamic restrictions of the anisotropic parameters showing that a significant range of elastic properties can be modeled with excellent accuracy. Further, it is shown that it provides a very good approximation of the microplane stresses provided by the first approach, with the advantage of a simpler formulation.It is concluded that the spectral stiffness decomposition represents the best approach in such cases as for modeling unidirectional composites, in which accurately capturing the elastic behavior is important. The introduction of orientation-dependent microplane elastic moduli provides a simpler framework for the modeling of transversely isotropic materials with remarked inelastic behavior, as in the case, for example, of shale rock.

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“…al. [49], as shown in Table 2. Based on the experimental data, one has E = 16.0 GPa, E = 32.0 GPa, ν = 0.29, ν = 0.28, and G = 15.0 GPa, and the elastic stiffness matrix, E, reads: …”

Section: Elastic Microplane Model Formulation For Rigid Polymeric Foamsmentioning

confidence: 92%

Elastic Microplane Formulation for Transversely Isotropic Materials

Jin

Salviato

et al. 2016

Journal of Applied Mechanics

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“…The available test results on PVC foams indicate that mechanical behavior of closed-cell PVC foams is transversely isotropic and the 1-2 plane is a plane of isotropy. [8][9][10][11] Microstructure of PVC foams in the 1-2 plane (plane of isotropy) is different from that in the transverse planes (or planes parallel to the foam rise direction). The difference in foam microstructure in the 1-2 plane and the transverse plane is expected to affect foam mechanical strength and will need to be taken into account in modeling the strength of closed-cell PVC foams.…”

Section: Microstructure Of Closed-cell Pvc Foamsmentioning

confidence: 99%

“…foam rise direction) different from those in the in-plane (plane of isotropy) directions. 8–11 Hence, the transversely isotropic behavior is considered in modeling the mechanical strength of closed-cell PVC foams. An engineering approach is taken to derive governing equations for predicting tensile, compressive, and shear strengths of PVC foams with the objective of minimizing the number of needed material and microstructure input parameters.…”

Section: Introductionmentioning

confidence: 99%

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Failure strength predictions for closed-cell polyvinyl chloride foams

Miyase

Wang

2018

Journal of Composite Materials

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This paper describes an effort to model mechanical strength of closed-cell polyvinyl chloride foams under static loading. The study presented here is a continuation of an earlier study to model elastic stiffness of closed-cell polyvinyl chloride foams as effective transversely isotropic materials. An engineering approach is used in the study and governing equations are developed for predicting the strength of polyvinyl chloride foams. To account for foam microstructure and cell-shape anisotropy on foam strength, a unit cell representation of the polyvinyl chloride foam microstructure is used to derive equations to assess tensile and shear strengths of polyvinyl chloride foams. The differential stretching of polyvinyl chloride foam cell walls (in the rise direction and in the in-plane directions) on the strength of the foam-matrix polymer is also taken into account in modeling the mechanical strength of polyvinyl chloride closed-cell foams. The behavior of closed-cell polyvinyl chloride foams under compression is different from that under tension. In the paper, the equations for predicting compressive strength of closed-cell polyvinyl chloride foams are based on an approximate theory developed in an earlier study of compressive strength of unidirectional composites. The validity of the foam strength predictive equations, derived in the paper, is first demonstrated through comparison of the predictions with the results on Divinycell H (DIAB) foams obtained from a systematic in-house test program. A comparison is also carried out between the strength predictions and the test results published by two polyvinyl chloride foam manufacturers for different density polyvinyl chloride foams. Good agreements are found for all the different density foams studied.

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“…Analysis of sandwich structures is commonly seen in the literature for traditional core configurations [5][6][7]. However, studies on sandwich structures in which the foam core is reinforced by transverse pins are scarce.…”

Section: Introductionmentioning

confidence: 99%

In situ L-RTM manufacturing of sandwich panels with PET foam core reinforced by polymeric pins

Delucis

Tonatto

Trindade

et al. 2019

Jnl of Sandwich Structures & Materials

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The objective of this study is to investigate a novel methodology for the in situ light resin transfer molding manufacturing of sandwich panels in which the poly(ethylene terephthalate) foam core is reinforced by transverse polymeric pins used to improve both flatwise compressive and flexural strength of the foam. The foam cores were pre-drilled, and these holes were later filled with resin during the light resin transfer molding production of the panels. Five types of samples were evaluated: control (core without pins) and reinforced cores with variable pin diameters and distances. Both experimental and numerical results are presented, and good agreement between them was achieved. Pin diameters below 3 mm lead to failure by local buckling, whereas diameters larger than 4 mm showed manufacturing issues related to the incomplete formation of pins.

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Experimental analyses of the poly(vinyl chloride) foams' mechanical anisotropic behavior

Cited by 17 publications

References 19 publications

Elastic Microplane Formulation for Transversely Isotropic Materials

Elastic Microplane Formulation for Transversely Isotropic Materials

Failure strength predictions for closed-cell polyvinyl chloride foams

In situ L-RTM manufacturing of sandwich panels with PET foam core reinforced by polymeric pins

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