Abstract
During the development of composite materials for damaged pipelines repair is very important their fracture toughness evaluation. The objective of this work was to study the applicability of methodologies for fracture toughness evaluation of four types of glass fiber reinforced polymer matrix composites for pipelines repair. Preliminary tensile tests have been made using the ASTM D-3039 standard obtaining the monotonic mechanical properties of these materials. Their fracture behavior characterization was initially made according to ASTM E-1922 standard based on translaminar fracture toughness (K TL ) evaluation. The results showed that this methodology was not appropriate for the studied materials. We also used a methodology based on the CTOD (δ) evaluation according to ASTM E-1820 standard (with some modifications), and a more recent one based on the Schwalbe’s CTOD (δ 5 ). The results indicated that the δ 5 methodology was interesting for fracture toughness evaluation of the studied materials, being very attractive because it does not depend on mathematical models and it can be easily applied to different specimen geometries.
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