Mode I Fracture Toughness Testing of Composite Pipes
Source abstract
Abstract
A common industrial production process for axially symmetric composites is filament winding. For this type of material, interlayer properties cannot be evaluated using the available ISO and ASTM standards because the curved surfaces and partially interwoven fibers of cylindrical parts can affect the results. This paper presents a special test geometry for measuring the critical energy release rate GIc directly from actual filament wound products. Different specimen geometries were investigated numerically with respect to their stress state at the crack tip and tested experimentally. The results were compared against those of flat specimens tested according to ISO/ASTM standards and made from the same constituent materials as the original test pipe. Testing specimens taken from an actual filament wound pipe yields more realistic results of GIc = 1,220 J/m2 than testing flat specimens (GIc = 330 J/m2), especially made for fulfilling the test standard’s requirements.
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Research context
OpenAlex topics: Mechanical stress and fatigue analysis · Fatigue and fracture mechanics · Mechanical Behavior of Composites
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References (27)
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