Abstract：A new type polymer composite was developed by filling short stainless steel fibers (SSFs) into polypropylene (PP). The creep behavior of the composite material was studied under different level of creep load. The experiment shows that a nonlinear relationship exists between the creep strain and creep load under the same loading time, and such a phenomena could not be explained by the linear viscoelastic theory. In order to analyze the phenomena, the view of creep load dependence of retardation time was taken into account. It was found that a linear relation between the retardation time and creep load in the logarithmic coordinate system, and thus the power-law relation was proposed to describe the relation between the retardation time and creep load. Further analysis indicated that the increase of retardation time with creep load is induced by micro-damage evolution.
2017, Vol. 38 
