DYNAMIC RESPONSE OF WOOD BASED BIO-COMPOSITIES UNDER HIGH-STRAIN RATE COMPRESSIVE LOADING.
Keywords:Split Hopkinson Pressure Bar, High Strain Rate Behavior, Wood, Bio-Composites, Methylene Diphenyl Diisocyanate(MDI), Micro-crystalline Cellulose(MCC)
This paper focuses on obtaining a high-strain compressive response of various wood-based biocomposites. The dynamic stress-strain curves of various wood-based biocomposites at three different strain rates were obtained using a split-Hopkinson pressure bar (SHPB) and were compared. The specific energy of each composite sample at three different strain rates was obtained and compared. It was found that 4% methylene diphenyl diisocyanate (MDI), 4% processed corn starch (CS) 600S had the highest specific energy for all nine different kinds of wood-based biocomposites tested in this study. The panel produced with 4% MDI and formed at the highest pressure (mat pressure of 1523 psi) consistently had the highest yield strength in the Hopkinson bar tests conducted at 10 psi (560-1053 s-1, was the range of strain rate achieved under this pressure), 15 psi (727-1380 s-1, was the range of strain rate achieved under this pressure), and 20 psi (766-15837 s-1, was the range rate of strain achieved under this pressure). When comparing samples that were formed under similar mat pressures, the material formed at the longest curing time (600 s) had the highest yield strength at 10 psi. At similar mat pressures, when tested at 15 psi, the material formed from 2% CS and 4% MDI at 140 s had the highest yield strength. At similar mat pressures, when tested at 20 psi, the material formed from 2% CS and 2% MDI at 140 s had the highest yield strength. Samples containing CS had a high average strain rate when compared with other wood samples, and this shows that the CS contributed to the high stain rate of the material.
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