Modeling of Compression Curves of Flexible Polyurethane Foam with Variable Density, Chemical Formulations and Strain Rates
Publish place: Journal of Solid Mechanics، Vol: 6، Issue: 1
Publish Year: 1393
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JSMA-6-1_007
تاریخ نمایه سازی: 28 مرداد 1402
Abstract:
Flexible Polyurethane (PU) foam samples with different densities and chemical formulations were tested in quasi-static stress-strain compression tests. The compression tests were performed using the Lloyd LR۵K Plus instrument at fixed compression strain rate of ۰.۰۳۳ s-۱ and samples were compressed up to ۷۰% compression strains. All foam samples were tested in the foam rise direction and their compression test stress results were modeled using a constitutive Polymeric or Phenomenological Foam Model (PFM). In this research, a new constitutive PFM model that consists of mechanical systems such as dashpots and springs was formulated to be used for different strain rate experiments. The experimental compression test results for different strain rates were compared to the PFM model results for all foam samples. Both modeling and experimental results showed pretty good agreement. From curve fitting of the experimental tests with the PFM model; different mechanical materials’ coefficients such as elastic and viscous parameters were computed. These mechanical parameters are indeed important characteristics for viscoelastic materials. This model can be used for constant and variable strain rates and for characterizing biomechanical material applications such as bone tissues, muscle tissues and other cellular materials.
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Authors
M.F Alzoubi
Director of Research & Development, All Cell Technologies LLC, Chicago
S Al-Hallaj
Director of Research & Development, All Cell Technologies LLC, Chicago
M Abu-Ayyad
ME Department, Penn State Harrisburg, Middletown
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