Stress wave propagation and mitigation in two polymeric foams

Pradel, Pierre; Malaise, F.; Cadilhon, Baptiste; Quessada, Jean-Hugues; Rességuier, T. de; Delhomme, Catherine; Blanc, Gaël Le

doi:10.1063/1.5044934

Cited by 9 publications

(6 citation statements)

References 8 publications

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“…PLEASE CITE THIS ARTICLE AS DOI: 10.1063/5.0077613 weight tower (HEL 24 MPa). It is also consistent with our own previous work [16][17][18]. In shot #6, because the rear surface was maintained with a tape for recovery and for post-shot analyzes, the above formula does not apply.…”

Section: Please Cite This Article Assupporting

confidence: 89%

“…The mechanical behavior of polyurethane foams has already been studied for different strain rates. This characterization includes drop weight tower experiments [2][3][4][5], Split Hopkinson Pressure Bar (SHPB) tests [6][7][8][9][10][11], gas gun experiments [12][13][14][15][16][17], and electron beam tests [17,18]. To complement this exploration and extend it to higher strain rates relevant to the aforementioned context, we used laser-driven shocks to generate stress pulses of duration lower than 100 ns.…”

Section: Introductionmentioning

confidence: 99%

“…The analysis of X-ray radiographs allows to calculate the propagation velocity of these waves, then post-recovery characterization using both microscopy and X-ray tomography provides the state of the foam after shock propagation. A macroscopic compaction model is used to simulate the foam behavior under dynamic loading [16][17][18], and simulations are compared with experimental results.…”

Section: Introductionmentioning

confidence: 99%

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In situ radiographic and ex situ tomographic investigation of pore collapse in laser shock-loaded polyurethane foam

Pradel

Rességuier

Malaise

et al. 2022

Journal of Applied Physics

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Laser-driven shock experiments were conducted at a synchrotron facility to investigate the dynamic response of a polyurethane foam. These experiments were coupled to in-situ X-ray imaging to radiograph foam deformations and determine the propagation velocity of stress waves. To increase the amplitude and the duration of the pressure load generated by the laser-matter interaction, the front surface of the target was covered with a confining layer (water and BK7 glass). Preliminary calibration tests involving time-resolved velocity measurements were performed to calculate the ablation pressure on the front surface of foam samples. The calculated pressure loads were used as input data for hydrodynamic simulations, in which the foam is modeled using a homogeneous porous macroscopic model, and model predictions were compared with experimental results. A fair consistency was found for most experiments, while for the others, an overestimation of the applied pressure is suspected, likely due to a laser breakdown within the confining medium. Finally, post-shot X-ray tomography of the recovered samples showed permanent deformation of the foam, unlike what was observed under quasi-static compression, and revealed heavy damage in the vicinity of the loaded zone.

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Section: Please Cite This Article Assupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In situ radiographic and ex situ tomographic investigation of pore collapse in laser shock-loaded polyurethane foam

Pradel

Rességuier

Malaise

et al. 2022

Journal of Applied Physics

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“…As the mechanical loading in these experiments can be considered 1D in the direction of waves propagation, the use of a 1D hydrocode for calculations is justified. Model parameters have previously been calibrated and validated by performing dedicated dynamic experiments (magnetic pressure, plate impact, electron beam and laser-driven shock experiments) on polyurethane foam [3][4]. In this model, the bulk modulus, on which depends the elastic precursor velocity, is taken equal to 500 MPa, and the Hugoniot Elastic Limit (HEL) is equal to 21 MPa.…”

Section: Modellingmentioning

confidence: 99%

“…A rigid closed cell polyurethane foam (320 kg/m 3 ) has been chosen for its energy absorption abilities. Quasi-static and dynamic experiments (magnetic pressure, plate impact, electron beam and laser-driven shock experiments) have already been performed to provide valuable data [3][4][5] for the development and validation of a constitutive model.…”

Section: Introductionmentioning

confidence: 99%

Fast x-ray radiography to study the dynamic compaction mechanisms in a rigid polyurethane foam under plate impact

Pradel

Malaise

Rességuier

et al. 2020

SHOCK COMPRESSION OF CONDENSED MATTER - 2019: Proceedings of the Conference of the American Physical Society Topical Group on S

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This article presents results of plate impact experiments coupled to in situ X-ray radiography, performed on a polyurethane foam, to visualize its deformations during the propagation of a stress wave. A two-wave structure associated with the propagation of an elastic precursor and pores compaction has been observed. A phenomenological compaction model, implemented in a dynamic explicit one-dimensional hydrocode, was used to simulate the dynamic macroscopic response of the foam. By using this model, which has previously been calibrated and validated by performing dedicated dynamic experiments, it is possible to compare calculated and experimental waves velocities and improve interpretations. Quasi-static tests coupled to in situ X-ray tomography have also been performed to study the mechanical behavior under low strain rates. Experimental results show that the compaction is due to bending and buckling of cell edges, and then matrix failure. Strain rate dependence of the foam behavior has been observed.

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Wave Propagation Speed Analysis in Polyurethane Foams

Mikulich

2022

Lecture Notes in Mechanical Engineering

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Stress wave propagation and mitigation in two polymeric foams

Cited by 9 publications

References 8 publications

In situ radiographic and ex situ tomographic investigation of pore collapse in laser shock-loaded polyurethane foam

In situ radiographic and ex situ tomographic investigation of pore collapse in laser shock-loaded polyurethane foam

Fast x-ray radiography to study the dynamic compaction mechanisms in a rigid polyurethane foam under plate impact

Wave Propagation Speed Analysis in Polyurethane Foams

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