Experimental and simulated high strain dynamic loading of polyurethane foam

Whisler, Daniel; Kim, Hyonny

doi:10.1016/j.polymertesting.2014.12.004

Cited by 40 publications

(27 citation statements)

References 17 publications

(24 reference statements)

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“…In the third step, densification falls out, and the stress increases. 19,[21][22][23][24] Depending on their cell morphology of structure, PUFs cover a broad range of properties.…”

Section: Compression Testmentioning

confidence: 99%

Fabrication and characterization of functional graded polyurethane foam (FGPUF)

Esmailzadeh

Manesh

2017

Polymers for Advanced Techs

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“…In the third step, densification falls out, and the stress increases. 19,[21][22][23][24] Depending on their cell morphology of structure, PUFs cover a broad range of properties.…”

Section: Compression Testmentioning

confidence: 99%

Fabrication and characterization of functional graded polyurethane foam (FGPUF)

Esmailzadeh

Manesh

2017

Polymers for Advanced Techs

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“…Plentiful experimental studies have focused on the high rate response of various polymeric adhesive materials such as elastomer and flexible polyurethane . The mechanical behavior of polymeric adhesives tends to be sensitive to strain rates as a result of the viscoelasticity nature .…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical behavior of polymeric adhesives tends to be sensitive to strain rates as a result of the viscoelasticity nature . The split‐Hopkinson pressure bar (SHPB) technique is the prevailing experimental tool to characterize the dynamic stress–strain response of materials including metals, ceramics, polymers, and their composites . However, the challenge arises in the conventional SHPB test of a soft polymeric adhesive due to its low strength; the transmitted wave signal propagating in the output bar is so low that the noise can often prevent the interpretation of the transmitted signal.…”

Section: Introductionmentioning

confidence: 99%

“…Plentiful experimental studies have focused on the high rate response of various polymeric adhesive materials such as elastomer and fl exible polyurethane. [ 2,[4][5][6] adhesives. [19][20][21][22][23][24][25][26][27][28][29] An elastoplastic constitutive formula has been developed to simulate both the reversible elastic and irreversible inelastic deformation of a ductile polymeric adhesive in adhesively bonded aluminum components.…”

Section: Introductionmentioning

confidence: 99%

“…[ 6,7 ] The split-Hopkinson pressure bar (SHPB) technique is the prevailing experimental tool to characterize the dynamic stress-strain response of materials including metals, [ 8 ] ceramics [9][10][11] , polymers, [ 6,12 ] and their composites. [ 4,13 ] However, the challenge arises in the conventional SHPB test of a soft polymeric adhesive due to its low strength; the transmitted wave signal propagating in the output bar is so low that the noise can often prevent the interpretation of the transmitted signal. Viscoelastic bars [14][15][16] or a hollow output bar [ 17,18 ] has been used to modify the SHPB to test the low-impedance materials.…”

mentioning

confidence: 99%

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Experimental Characterization and Modified Constitutive Modeling of the Strain Rate Dependent Compressive Behavior of Adhesives

Wang

2016

Macro Materials & Eng

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Predicting the impact performance of adhesively bonded structures requires the accurate characterization and constitutive formulation of the compressive behavior of the adhesive at dynamic strain rates. In this work, the stress–strain curves of Sikaflex adhesives are measured in uniaxial compression tests at quasi‐static and dynamic strain rates. The split‐Hopkinson pressure bar technique is modified with the hollow output bar to effectively characterize the dynamic response of the adhesive. It is found that the Sikaflex adhesive is incompressible and hyperelastic; the compressive behavior is significantly influenced by the strain rate. The strain rate sensitivity is not constant but varies as a function of the strain and the strain rate. The strain rate effect on compressive behavior is quantified and incorporated into the phenomenological hyperelastic constitutive model based on strain energy density. The modified constitutive equation accurately represents the strain rate dependent compressive behavior of Sikaflex adhesives.

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A Mechanical Model of Cellular Solids for Energy Absorption

Avalle

Belingardi

2018

Adv Eng Mater

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Cellular materials, also known as foams, have a variety of applications in the field of packaging, and shock mitigation in the case of crash of vehicles, due to their ability to protect goods by absorbing energy in the case of impact while reducing the transmitted loads. To properly design energy absorption devices and systems such as bumpers, road barriers, helmets, sole paddings, packages, etc. it is necessary to use precisely predictive models of cellular materials, in order to select the most suitable foam for the considered application. The model must describe the stress-strain behavior, at least uniaxial compression, but also sometimes the tension and multiaxial loading, then energy absorption characteristics is evaluated. Moreover, it must take into account affecting factors like the strain-rate. Secondarily, modeling the influence of the density heavily helps designer in selecting the best solution in terms of minimum weight per given energy to dissipate. In previous works, the authors present more than one model able to describe the quasistatic stress-strain behavior of several cellular materials. The current paper presents a very general model able to describe, with properly identified parameters, the mechanical characteristics of a much larger variety of cellular materials including metal foams, foam mechanical properties (like, e.g., the dependence on density), and takes into account the influence of strain-rate. Among the considered materials are the Foaminal 1 aluminum foam and the APM 1 hybrid foam. The model is fitted to experimental tests with parameters identified based on past experimental data from the authors themselves. Tests include quasi-static, dynamic, and impact tests at different loading speed and impact energy. It is shown that the proposed model is fundamentally suitable for most materials, virtually any foamed material, and it is an outstandingly useful tool for designers in the mentioned areas.

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Experimental and simulated high strain dynamic loading of polyurethane foam

Cited by 40 publications

References 17 publications

Fabrication and characterization of functional graded polyurethane foam (FGPUF)

Fabrication and characterization of functional graded polyurethane foam (FGPUF)

Experimental Characterization and Modified Constitutive Modeling of the Strain Rate Dependent Compressive Behavior of Adhesives

A Mechanical Model of Cellular Solids for Energy Absorption

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