BIAXIAL STRESS CREEP BEHAVIOUR OF HIGH DENSITY POLYETHYLENE

A series of creep tests of HDPE in uniaxial and biaxial stress state were performed on a specially designed biaxial creep machine, a multiple integral function relationship was employed and the stress terms up to third order have been taken into acount. It is found that the corrected multiple integral representation considering the linear viscoelastic range in low stress level agrees very well with test data.