Influence of crack sharpness on the fracture toughness of epoxy resins
Notch sharpening of polymeric fracture samples is still an unsolved problem.The existing methodologies for the evaluation of the fracture toughness of polymers recommend the use of contact techniques such as razor sharpening which,in some cases,can induce high scatter in toughness results or even overestimated values.The present work analyzes the effect of crack sharpness on the fracture toughness of epoxy resins.Three-point bending tests were carried out on specimens with a wide range of tip radii,going from the size of natural cracks,~ 0.1 μm,to 2 mm.The behavior of the fracture toughness versus the crack tip radius has been modeled using a two criterion elastic model,a length and a stress,to estimate the overestimated toughness values with the crack tip radius and the effect of blunting arising from plastic deformation.
fracture toughness crack sharpness epoxy resins
Alicia Salazar Yatish Patel J.G.Williams
Departamento de Tecnología Mecánica,Universidad Rey Juan Carlos,28933 Madrid,Spain Mechanical Engineering Department,Imperial College London,London SW7 2AZ,United Kingdom Mechanical Engineering Department,Imperial College London,London SW7 2AZ,United Kingdom;Aero,Mechani
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）