Fracture Behaviour of an Epoxy Resin

• Type: Article in International Conference Proceedings Book
• Date: 1993

Authors

Teresa Pimenta (Author) Other; Paulo Tavares de Castro (Author) FEUP; António Torres Marques (Author) FEUP

Conference proceedings International

Title: ICCM-9

9th International Conference on Composite Materials - ICCM

Madrid, Spain

Other information

Resumo (PT): The mechanical characteristics and the fracture behaviour, in mode 1, of an epoxy resin based on bisphenol A, ®Araldite GY 257, cured with an hardener based on aliphatic polyamine, HY 951, have been studied. Two types of cure - 48 hours at 21°C±2°C and 50±5% relative humidity followed by a post-cure of 2h at 100°C±2°C (cure A), and 48 hours at 21°C±2°C and 50±5% relative humidity (cure B) - were applied. The studies were also carried out at different ambient conditions, i.e. ambient temperature and ambient humidity, and also after immersion during 125 days in distilled water at 30°C±2°C and 58°C±2°C, respectively. The fracture behaviour tests were carried out with single-edge notched SEN specimens machined from resin plates with two types of cure. Absorption studies with the SEN specimens were carried out to help the interpretation of results. The immersion in water at 58°C±2°C, during 125 days altered significantly the mechanical properties and the fracture behaviour. Higher values for tensile strength and elongation at rupture were found, together with lower values for the elasticity modulus and stress intensity factor KIC-. The fracture surfaces were observed with scanning electron microscopy in order to establish a correlation with the cure conditions and/or the ambient conditions.

Abstract (EN): The mechanical characteristics and the fracture behaviour, in mode 1, of an epoxy resin based on bisphenol A, ®Araldite GY 257, cured with an hardener based on aliphatic polyamine, HY 951, have been studied. Two types of cure - 48 hours at 21°C±2°C and 50±5% relative humidity followed by a post-cure of 2h at 100°C±2°C (cure A), and 48 hours at 21°C±2°C and 50±5% relative humidity (cure B) - were applied. The studies were also carried out at different ambient conditions, i.e. ambient temperature and ambient humidity, and also after immersion during 125 days in distilled water at 30°C±2°C and 58°C±2°C, respectively. The fracture behaviour tests were carried out with single-edge notched SEN specimens machined from resin plates with two types of cure. Absorption studies with the SEN specimens were carried out to help the interpretation of results. The immersion in water at 58°C±2°C, during 125 days altered significantly the mechanical properties and the fracture behaviour. Higher values for tensile strength and elongation at rupture were found, together with lower values for the elasticity modulus and stress intensity factor KIC-. The fracture surfaces were observed with scanning electron microscopy in order to establish a correlation with the cure conditions and/or the ambient conditions.

Language: Portuguese

Type (Professor's evaluation): Scientific