Polyethylene-Kevlar Composite Foams III: Torsion Properties

Zhang, Yaolin; Rodrigue, Denis

doi:10.1177/026248930502400101

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…S ) of the WPC foams are compiled in Figure 3. According to Zhang and Rodrigue [16], the modulus of foamed composites is proportional to that of comparable unfoamed ones for all strain rates. They concluded that both foamed and unfoamed samples behave in a similar manner.…”

Section: Specific Complex Shear Moduli (G ãmentioning

confidence: 91%

Injection Molding of Postconsumer Wood–Plastic Composites II: Mechanical Properties

Gosselin

Rodrigue

Riedl

2006

Journal of Thermoplastic Composite Materials

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In the first part of this study, fiber-reinforced microcellular foams were produced via injection molding to study their morphological properties as a function of mold temperature as well as wood, blowing agent, and coupling agent concentrations. Yellow birch wood fibers are added to a recycled postconsumer HDPE/PP matrix (85: 15 ratio) in proportions ranging from 0 to 40 wt% and then foamed with a chemical blowing agent. Maleic-anhydride-polypropylene copolymer (MAPP) is also used as a coupling agent in proportions ranging from 0 to 10 wt% of wood content. In this second part, the mechanical properties in flexion, torsion, and traction are presented.

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Section: Specific Complex Shear Moduli (G ãmentioning

confidence: 91%

Injection Molding of Postconsumer Wood–Plastic Composites II: Mechanical Properties

Gosselin

Rodrigue

Riedl

2006

Journal of Thermoplastic Composite Materials

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“…Several models have been proposed to predict this ratio as a function of morphological parameter like reduced density and skin thickness. The tensile moduli of our PP foams as presented in Table 2 are now compared with mechanical models presented next where more details can be obtained in previous reports (17)(18)(19)(20)(21)(22) . For the moment, no models are available to predict other tensile properties like yield stress, stress at break, elongation at break, etc.…”

Section: Tensile Propertiesmentioning

confidence: 99%

Compression Moulding of Polypropylene Foams and Their Properties

et al. 2008

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Compression moulding was used to produce polypropylene foams using azodicarbonamide as a chemical blowing agent. The morphology of the foams is reported in terms of cell size, cell density, and skin thickness using 1.5, 2, 2.5 and 3% of blowing agent. The resulting foams were characterized mechanically in terms of tensile and flexural moduli and comparison with mechanical models was made to predict foam performance. In general, mechanical properties, cell density, skin thickness and foam density decreased, while cell size increased with increasing amount of blowing agent. It was also found that simple mechanical models based solely on foam density and skin thickness were not able to correctly predict all the experimental data. For better prediction, foam density profile must be used.

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“…Finally, there is a densification phase when the network is collapsed onto itself and contact between network elements, which results in dramatic stiffening of the material. Although actual cell microstructure is very complicated, these regimes of deformation have been studied extensively and significant understanding has been obtained using idealized models 3–9. Currently, the quite popular theoretical model used to predict the compression properties of low density foams was put forth by Gibson and Ashby,2 which shows that in idealized cubic cell model the mechanical properties are closely relative to the foam relative densities and material properties, which is further proved by many experimental results 1, 10, 11.…”

Section: Introductionmentioning

confidence: 98%

“…Currently, the quite popular theoretical model used to predict the compression properties of low density foams was put forth by Gibson and Ashby,2 which shows that in idealized cubic cell model the mechanical properties are closely relative to the foam relative densities and material properties, which is further proved by many experimental results 1, 10, 11. For high density foams, Moore et al proposed an empirical expression for the modulus of polypropylene foams 5. In compression process, a particularly unusual aspect of foams is the large capacity to absorb energy, which stems from the large deformation of cell walls and edge.…”

Section: Introductionmentioning

confidence: 99%

Compressive response and energy absorption of foam EPDM

Wang

Peng

Zhang

et al. 2007

J of Applied Polymer Sci

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Ethylene-propylene-diene terpolymer foam was prepared by two different processing routes. The microstructure and mechanical properties of the foams with wide relative density ranging from 0.11 to 0.62 have been studied via scanning electron microscopy and mechanical testing, respectively. Scanning electron microscopy shows that the foam with lower relative density has a unique bimodal cell size structure, which the larger cells inlay among the smaller cells, while the foam articles with higher relative density have thicker cell walls with few small cells. The compressive stress-strain curves show that the foam articles with lower relative density have three regimes: linear elastic, a wide slightly rising plateau, and densification, while the foam articles with higher relative density have only two regimes: the longer linear elastic and densification. The relative modulus increases with the increase in the relative density. The contribution of the gas trapped in the cell to the modulus could be neglected. The energy absorbed per unit volume is relationship with the permitted stress and the relative density. The efficiency and the ideality parameter were evaluated from the compressive stress-strain plots. The parameters were plotted against stress to obtain maximum efficiency and the maximum ideality region, which can be used for optimizing the choice for practical applications in cushioning and packaging.

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Polyethylene-Kevlar Composite Foams III: Torsion Properties

Cited by 7 publications

References 16 publications

Injection Molding of Postconsumer Wood–Plastic Composites II: Mechanical Properties

Injection Molding of Postconsumer Wood–Plastic Composites II: Mechanical Properties

Compression Moulding of Polypropylene Foams and Their Properties

Compressive response and energy absorption of foam EPDM

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