以PVC(聚氯乙烯)板材作为试验材料,制作成单向拉伸试件,在室温条件下,进行了相同速率不同缺陷尺寸和相同缺陷不同拉伸速率下的拉伸实验.运用项目组自主研发的高聚物热致磁效应全域测量系统和红外热像仪对高聚物热致磁效应进行了量测.实验结果表明,含缺陷PVC板材在拉伸过程中,由于拉伸载荷和粘塑性变形热等热-力耦合作用会导致热致磁效应,且这种热磁效应强度B强烈地依赖于应变速率和缺陷尺寸.本研究结果为对合理使用和设计新型材料提供了新的理论和实验依据,对新型材料的寿命预测、安全生产、事故防范等具有重要的理论意义和工程应用价值.%A kind of high polymer,polyvinyl chloride(PVC) sheet was used as material and made into tensile samples with defects. Then, under room temperature, the tensile tests were carried out under different strain-rates and with the same defect sizes, or under the same strain-rates but with different defect sizes. The pyromagnetic effect of high polymer with defects was measured by using the whole-region surveying system self-developed by the researchists, and by means of infrared thermographic sensor. The experimental data show that this kind of effect was produced owing to the thermo-mechanical coupling property and the pyromagnetic induction intensity B was strongly depended on the tensile strain-rate and the size of defect. The findings provides a new theoretical and experimental basis for the reasonable use and design new materials. It has an important theoretical significance and application value for the life prediction, safe production and accident prevention of new materials.
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