Use of a LHFB Device for Testing Mode III in a Composite Laminate

Polymers

Isabel Viña¹  Jorge Bonhomme¹  Antonio Argüelles¹  Jaime Viña²  Victoria Mollón²  Carlos Bertorello² 

[1] Department of Construction and Manufacturing Engineering, University of Oviedo, 33203 Gijón, Spain;Department of Materials Science and Metallurgical Engineering, University of Oviedo, 33203 Gijón, Spain;

关键词: composite;    fracture;    fatigue;    mode III;   

DOI  :  10.3390/polym11081243

来源: DOAJ

【 摘 要 】

The present paper studies the fatigue delamination behaviour of an epoxy/carbon composite material under mode III loading using a longitudinal half fixed beam (LHFB) device initially designed for mode III static tests of composite materials formed by the stacking of plies. For this purpose, a series of tests was carried out at different levels of loading representative of the fatigue behaviour of the material, from the crack onset phase through the delamination phase to final fracture. The experimental results were treated statistically, obtaining the values of the fatigue limit for probabilities of fracture of 5% and 50%. Finally, a fractographic analysis of the fracture surfaces was performed which allowed us to identify the same characteristic patterns of static mode III fracture, namely broken fibres, cusps and saw-teeth, in addition to a new morphology consisting of the formation of agglomerations of resin produced by the friction between the lips of the specimen in the fracture zone that point to dynamic mode III fracture. These agglomerations eventually crack and become detached from the fibres, leaving these free of resin.

【 授权许可】

Unknown