The Macroscopic Yielding Behavior of Polymers in Multiaxial Stress Fields.
RUTGERS - THE STATE UNIV NEW BRUNSWICK N J DEPT OF MECHANICS AND MATERIALS SCIENCE
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Experimental data on yielding of polyoxymethylene POM and polypropylene PP have been obtained in a wide range of complex triaxial stress conditions. These complex triaxial stress states have been produced by superimposition of simple stresses such as uniaxial compression, uniaxial tension and pure shear on hydrostatic pressure of various intensities. The actual yield surfaces of both polymers were constructed using the data. The yield surface of POM is a cone-like surface with a pointed apex with straight edges, while the yield surface of PP is a cone-like nonlinear surface also with a pointed apex. A yield criterion is shown to very closely predict the observed behavior of both polymers. Author