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FRACTURE MECHANICS TECHNIQUES IN LARGE DIAMETER PVC PIPES

 

Antonio Rodolfo Jr., Vanderley M. John

# 2021 Amsterdam

Unplasticised (U-PVC) and modified (M-PVC) pipes used in irrigation and infrastructure applications, outside diameter 326 mm, were evaluated according to various fracture mechanics methodologies, including fracture toughness (stress intensity factor KC and energy release rate GC, both at fracture), essential work of fracture (EWF) and C-ring toughness. These pipes were also evaluated for the quality of processing (degree of gelation) via DSC and tensile strength. Results show that, even with impact modifiers added in minor quantities in M-PVC as in the Brazilian situation, the differences in behavior against fracture propagation are sensitive, depending on the technique, when comparing the results between the different types of pipes, opening up new possibilities for testing this product. This possibility is particularly interesting in the case of the evaluation of the degree of gelation, since the dichloromethane (DCMT) method still in use tends to be replaced in the future by alternative methodologies due to chemical exposition factors.

Related keywords : fracture mechanics, degree of gelation, PVC, essential work of fracture, EWF.
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