聚氯乙烯断面特征区及粗糙度与断裂能的关系

以往对聚合物材料的断面粗糙度与力学性能关系的研究主要是针对断面总体粗糙度进行的，忽略了断裂的不同阶段及不同的断裂机制在断面上产生的相应的特征区对力学性能参数的影响，导致如文献［１］、［２］中得出的粗糙度参数与断裂能耗间的数据关系存在较大的分散性．本文...

THE RELATIONSHIP OF CHARACTERISTIC ZONES AND ROUGHNESS OF POLYVINYL CHLORIDE FRACTURE SURFACE WITH BREAK ENERGY

Polyvinyl chloride(PVC) specimens were subjected to three|point bending.The results of test and measurement show that there is a relationship of positive correlation between roughness of fracture surface and break energy per unit area.On the other hand,a certain degree of data deviation can be seen in the relationship.The deviation is principally affected by the ratios of real area of the characteristic zones on fracture surface because the effects of every characteristic zone on break energy are different.By using the synthetic effect of roughness and the characteristic zones on break energy,the degree of deviation can be sharply reduced.So,break energy can be quantitatively analysed by combining the effects of fracture surface roughness and fracture characteristic zones.=