Short‐term creep properties and creep model of wood‐plastic composites
Longlong Zhao, Yang Wei, Guo Wei Zhang, Fei Xi
Abstract
Abstract 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.