用简化Acierno模型预测LDPE熔体的触变环实验

PREDICTIONS OF THE THIXOTROPY-LOOP TESTS OF LDPE MELT BY USING THE SIMPLIFIED ACIERNO-TYPE MODEL

考察了简化Acierno型本构方程的预测能力．用简化Acierno方程预测了LDPE(Q200)熔体的触变环实验,比较了该方程和变型Huang方程在拟合和预测触变环实验方面的差异．虽然简化Acierno方程只能拟合LDPE熔体的部分触变环实验,但该方程预测的触变环与实验值的偏差较小,而同样的计算条件下,变型Huang方程的预测结果与实验值相差较大．简化Acierno方程的构造比变型Huang方程的构造更为合理．

The prediction ability of the simplified Acierno-type constitutive equation is examined in the present paper. The thixotropy-loop tests of an LDPE（Q200） melt are predicted by the simplified Acierno equation, and the differences between the model and the variant Huang model in the descriptions and the predictions of the thixotropy-loop tests are compared. It is shown that the deviations of the predictions by the simplified Acierno equation from the experiments are smaller than those obtained by the variant Huang model under the same calculation conditions, although only partial descriptions of the thixotropy-loop tests of the melt by the simplified Acierno model agree with the experiments. The constitution of the simplified Acierno equation is more reasonable than that of the variant Huang model.