Short-term creep properties and creep model of wood-plastic composites

Wood-plastic composites (WPC) were produced by a two-step extrusion process, and the mechanical properties like strength, elastic modulus, and Poisson's ratio of WPC were investigated. Twenty-four hours uniaxial tensile and compressive creep experimental tests under four stress levels of 15%, 30%, 45%, and 60% were completed. The results show that whether tensile or compressive creep, 15% and 30% stress levels are low-stress levels and 60% is high. When the stress level is 60%, brittle fracture occurs in 2.6 h for the tensile creep test, while it arises in 16.6 h for the compressive experiment. The Findley model can predict the creep behavior of WPC at high, medium, and low-stress levels, and the fractional-order model has the highest fitting degree for the creep properties at high-stress levels.

Automated summary

The study focused on investigating the mechanical properties of wood-plastic composites (WPC) produced through a two-step extrusion process. It was found that different stress levels had varying effects on the creep behavior of WPC, with higher stress levels leading to brittle fractures more quickly. The Findley model was able to predict creep behavior at different stress levels, while the fractional-order model showed the highest fitting degree for high-stress levels.