Synthesis and Mechanical Properties of Novel Ni/PU Hybrid Foams: A New Economic Composite Material for Energy Absorbers

Jung, Anne; Diebels, Stefan

doi:10.1002/adem.201500405

Cited by 26 publications

(19 citation statements)

References 25 publications

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“…Ni/PU hybrid foams with a pore size of 20 ppi (pores per inch) were produced according to the electrodeposition process described in previous work [ 16 , 17 , 18 ]. For both microtensile and three-point microbending experiments, individual struts must be carefully extracted from the macroscopic foam without causing pre-deformation of the struts.…”

Section: Methodsmentioning

confidence: 99%

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Micromechanical Characterisation of Ni/PU Hybrid Foams

et al. 2020

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The computer-aided design of individual parts and the desire for weight reduction and material savings require further development of new hybrid materials. Ni/PU hybrid foams as a new hybrid material offer great potential for the production of components that are lightweight and yet can absorb large amounts of energy. The development of this structured material is at its beginning and mechanical characterisation on all scales is necessary. Experimental investigations on individual struts must be carried out on the micro scale to understand the structure-properties-relationship. Inspite of the challenges raising due to the complex geometry of the struts, tensile tests, three-point bending tests and micro sections are presented in this work. Due to the stiff Ni coating on the outer diameter of the struts, the resistance against bending is around five times as high as against tensile loading. The correlation between the behaviour of the struts and the macroscopic material behaviour validates the planned use of the foams as energy absorbers.

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Section: Methodsmentioning

confidence: 99%

“…This paper presents experiments on individual struts of a nickel-polyurethane (Ni/PU) hybrid foam. This material is a composite foam, which combines the low cost of an open-cell PU foam with the high stiffness of a nanocrystalline Ni coating [ 16 ]. The results of the study are presented in four parts.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical Characterisation of Ni/PU Hybrid Foams

et al. 2020

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“…The electroplating was performed at current density 1.5 mA/cm 3 until a theoretical coating thickness of 75 µm Ni was deposited. For more details, it is referred to the literature [7][8][9]. The specimen of hybrid foam in the loading device is shown in Fig.…”

Section: Sample Preparationmentioning

confidence: 99%

Testing of Hybrid Nickel-Polyurethane Foams at High Strain-Rates Using Hopkinson Bar and Digital Image Correlation

Adorna

Zlámal

Fíla

et al. 2018

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In this paper Split Hopkinson pressure bar (SHPB) was used for dynamic testing of nickel coated polyurethane hybrid foams. The foams were manufactured by electrodeposition of a nickel coating on the standard open-cell polyurethane foam. High strength aluminium alloy bars instrumented with foil strain-gauges were used for dynamic loading of the specimens. Experiments were observed using a high-speed camera with frame-rate set to approx. 100-150 kfps. Precise synchronisation of the high-speed camera and the strain-gauge record was achieved using a through-beam photoelectric sensor. Dynamic equilibrium in the specimen was achieved in all measurements. Digital image correlation technique (DIC) was used to evaluate in-plane displacements and deformations of the samples. Specimens of two different dimensions were tested to investigate the collapse of the foam structure under high-speed loading at the specific strain-rate and strain.

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“…A high potential for impact energy protection pose materials with strain-rate sensitive behaviour which increase their stress response with increasing strain-rate. Such materials may be identified among closed cell metal foams, where strain-rate sensitive response is induced by air flow trough the cell walls during their failure [2], or coated open cell metal foams in which the strainrate sensitivity is caused by micro-inertia effects of the struts [3]. Another way to enhance cellular metals' impact energy absorption properties is to equip the porous structure with a suitable filling material to form inter-penetrating phase composite (IPC).…”

Section: Introductionmentioning

confidence: 99%

High Strain-Rate Compressive Testing of Filling Materials for Inter-Penetrating Phase Composites

Doktor

Fíla

Zlámal

et al. 2019

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In this study behavior of the selected types of filling material for the inter-penetrating phase composites was tested in compressive loading mode at low and high strain-rates. Three types of the filling material were tested, (i) ordnance gelatin, (ii) low expansion polyurethane foam, and (iii) polyurethane putty. To evaluate their impact energy absorption bulk samples of the selected materials were tested in compression loading mode at strain-rates 1000 s−1 to 4000 s−1. The high strain-rate compressive loading was provided by Split Hopkinson Pressure Bar (SHPB) which was equipped with PMMA bars to enable testing of cellular materials with low mechanical impedance. Based on the comparative measurement response to compression at both low and high strain-rates was analysed. The results show a significant strain-rate sensitivity of the ordnance gelatin and of the polyurethane putty, while strain-rate effect in the polyurethane foam was not observed.

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Synthesis and Mechanical Properties of Novel Ni/PU Hybrid Foams: A New Economic Composite Material for Energy Absorbers

Cited by 26 publications

References 25 publications

Micromechanical Characterisation of Ni/PU Hybrid Foams

Micromechanical Characterisation of Ni/PU Hybrid Foams

Testing of Hybrid Nickel-Polyurethane Foams at High Strain-Rates Using Hopkinson Bar and Digital Image Correlation

High Strain-Rate Compressive Testing of Filling Materials for Inter-Penetrating Phase Composites

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