JEC Group have brought together the international community of composites leaders and executives in our Composites Circle as an unique networking opportunity to meet with both peers and future partners.
This standard is about test method for determination of the mode II interlaminar fracture toughness of unidirectional fiber-reinforced polymer matrix composites using the end-notched flexure (ENF) test.
Laminated composite materials are everywhere and interlaminar cracks can cause serious damage to many types of structures and products, from sports equipment to spacecraft:
While fracture toughness tests exist for mode I and mixed-mode, no test currently exists for mode II.The mode II test described in ASTM D7905/D7905M will be used by industry and government for qualitatively comparing composite materials as well as determining values to be used in design, analysis and acceptance/rejection criteria.That delaminations can occur in several different ways: during manufacture, from damage during usage, from unexpected overloads of a structure or simply from normal service loadings over extended periods of time.“Delamination growth represents a critical failure mode in structures fabricated from fiber reinforced polymer matrix composites, so there is a concerted effort in the community to develop the tools and techniques to make sure that this does not occur,” says ASTM member Barry D. Davidson. Determining a material’s resistance to delamination growth is a key component to this work.More information: www.astm.org