Effects of cell-wall instability and local failure on the response of closed-cell polymeric foams subjected to dynamic loading

Koohbor, Behrad; Ravindran, Suraj; Kidane, Addis

doi:10.1016/j.mechmat.2017.03.017

Cited by 35 publications

(24 citation statements)

References 37 publications

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“…The compressive strength is independent of strain-rate in the transitional dynamic regime, if the base material is insensitive to strain-rate, which also indicates a negligible micro-inertia effect. For rate-dependent base material, the strain-rate sensitivity of the foam is slightly higher than that of the base material, which can be attributed to the microscopic strain-rate amplification [26,188]. The experimentally observed rate dependence of Alporas foam has been captured by the 3D…”

Section: A C C E P T E D Mmentioning

confidence: 90%

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Dynamic compressive behaviour of cellular materials: A review of phenomenon, mechanism and modelling

Sun

2018

International Journal of Impact Engineering

333

114

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights  Dynamic plastic properties, deformation modes, constitutive relations and shock states are described  Experimental observations in the quasi-static, transitional dynamic and shock regimes are presented  Mechanisms associated with inertia, enclosed gas and microscopic strain-rate sensitivity of base material are elucidated  Mesoscopic modelling and its applications are discussed with regard to idealised and realistic cell structures  Macroscopic continuum-based modelling for compression-dominated loading is summarised and commented

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Section: A C C E P T E D Mmentioning

confidence: 90%

“…A N U S C R I P T as well as the comparison between the microscopic strain-rate and macroscopic strain-rate [188]. It is clearly seen that microscopic strain-rate can be significantly larger than the macroscopic strain-rate.…”

Section: A C C E P T E D Mmentioning

confidence: 95%

Dynamic compressive behaviour of cellular materials: A review of phenomenon, mechanism and modelling

Sun

2018

International Journal of Impact Engineering

333

114

View full text Add to dashboard Cite

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“…To this purpose, crushable foam and honeycomb material models have been frequently employed for homogenization techniques in commercial finite element codes such as LS DYNA and Abaqus [4,15,18,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. The stiffness of polymeric foams is strain-rate dependent and is generally characterized by three phases of compression [37][38][39][40]. This begins with a linear elastic region and once a yield strain has been reached, the foam experiences a 'plateau' region of relatively constant stress that corresponds to the majority of energy absorption of a cellular material under compression.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Compression Impulse of Lithium-Ion Pouch Cells

2020

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Strain rate sensitivity has been widely recognized as a significant feature of the dynamic mechanical properties of lithium-ion cells, which are important for their accurate representation in automotive crash simulations. This research sought to improve the precision with which dynamic mechanical properties can be determined from drop tower impact testing through the use of a diaphragm to minimize transient shock loads and to constrain off-axis motion of the indenter, specialized impact absorbers to reduce noise, and observation of displacement with a high speed camera. Inert pouch cells showed strain rate sensitivity in an increased stiffness during impact tests that was consistent with the poromechanical interaction of the porous structure of the jellyroll with the liquid electrolyte. The impact behaviour of the inert pouch cells was similar to that of an Expanded Polypropylene foam (EPP), with the exception that the inert pouch cells did not show hysteretic recovery under the weight of the indenter. This suggests that the dynamic mechanical behaviour of the inert pouch cells is analogous to a highly damped foam.

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“…Other studies have used DIC to estimate fracture properties [28,33,[38][39][40]. For example, Mokhtarishirazabad et al [38] evaluated how DIC parameters affect the stress intensity factor estimation and found that not only subset size was important but also the size and position of the region of interest (ROI).…”

Section: Introductionmentioning

confidence: 99%

Some Practical Considerations for Compression Failure Characterization of Open-Cell Polyurethane Foams Using Digital Image Correlation

Belda

Megías

Feito

et al. 2020

Sensors

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(1) Background: Open-cell polyurethane foam mechanical behavior is highly influenced by microstructure. The determination of the failure mechanisms and the characterization of the deformation modes involved at the micro scale is relevant for accurate failure modeling. (2) Methods: We use digital image correlation (DIC) to investigate strain fields of open-cell polyurethane foams of three different densities submitted to compression testing. We analyze the effect of some DIC parameters on the failure pattern definition and the equivalent strain magnification at the apparent ultimate point. Moreover, we explore speckle versus non-speckle approaches and discuss the importance of determining the pattern quality to perform the displacement correlation. (3) Results: DIC accurately characterizes the failure patterns. A variation in the subset size has a relevant effect on the strain magnification values. Step size effect magnitude depends on the subset size. The pattern matching criterion presented little influence (3.5%) on the strain magnification. (4) Conclusion: The current work provides a comprehensive analysis of the influence of some DIC parameters on compression failure characterization of foamed structures. It highlights that changes of subset and step sizes have a significant effect on the failure pattern definition and the strain magnification values, while the pattern matching criterion and the use of speckle have a minor influence on the results. Moreover, this work stands out that the determination of the pattern quality has a major importance for texture analysis. The in-depth, detailed study carried out with samples of three different apparent densities is a useful guide for DIC users as regards texture correlation and foamed structures.

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Effects of cell-wall instability and local failure on the response of closed-cell polymeric foams subjected to dynamic loading

Cited by 35 publications

References 37 publications

Dynamic compressive behaviour of cellular materials: A review of phenomenon, mechanism and modelling

Dynamic compressive behaviour of cellular materials: A review of phenomenon, mechanism and modelling

Dynamic Mechanical Compression Impulse of Lithium-Ion Pouch Cells

Some Practical Considerations for Compression Failure Characterization of Open-Cell Polyurethane Foams Using Digital Image Correlation

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