Abstract
Hybrid reinforced polypropylene composites (PPCs) were fabricated via injection molding, and tensile tests were conducted. The results showed that the addition of cellulose nano-fibers (CNFs) and maleic-anhydride-modified polypropylene enhanced the PPC elastic constant and tensile strength. The nonlinear properties of the composites were analyzed via two-step asymptotic homogenization. After confirming that the numerical simulation can predict the experimental results well, a new strain-energy-based indicator was introduced to quantify the filler addition effect. The mechanical properties of PPCs can be linearly approximated using the indicator, named filler contribution proportion, and a simple composite design based on this relationship was proposed. As verification examples, the elastic constant and maximum tensile stress of unknown PPCs were predicted within a 5% error.
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