Crack initiation and propagation on the polymeric material ABS (Acrylonitrile Butadiene Styrene), under ultrasonic fatigue testing
Journal Title: Frattura ed Integrità Strutturale - Year 2015, Vol 9, Issue 34
Abstract
Crack initiation and propagation have been investigated on the polymeric material ABS (Acrylonitrile Butadiene Styrene), under ultrasonic fatigue testing. Three controlled actions were implemented in order to carry out fatigue tests at very high frequency on this material of low thermal conductivity, they are: a) The applying load was low to limit heat dissipation at the specimen neck section, b) The dimensions of testing specimen were small (but fitting the resonance condition), in order to restraint the temperature gradient at the specimen narrow section, c) Temperature at the specimen neck section was restrained by immersion in water or oil during ultrasonic fatigue testing. Experimental results are discussed on the basis of thermo-mechanical behaviour: the tail phenomenon at the initial stage of fatigue, initial shear yielding deformation, crazed development on the later stage, plastic strain on the fracture surface and the transition from low to high crack growth rate. In addition, a numerical analysis is developed to evaluate the J integral of energy dissipation and the stress intensity factor K, with the crack length
Authors and Affiliations
G. Domínguez Almaraz, E. Correa Gómez, J. Verduzco Juárez
Keywords
Related Articles
- EP ID EP159161
- DOI 10.3221/IGF-ESIS.34.55
- Views 54
- Downloads 0
Fracture-Safe and Fatigue-Reliable Structures
Learning from history is, by popular account, something at which human beings are not particularly good; George Bernard Shaw having stated that “we learn from history that we learn nothing from history”, while th...
Multiaxial fatigue criterion based on parameters from torsion and axial S-N curve
Multiaxial high cycle fatigue is a topic that concerns nearly all industrial domains. In recent years, a great deal of recommendations how to address problems with multiaxial fatigue life time estimation have been...
Can Keff be assumed as the driving force for fatigue crack growth?
This work raises some new questions about the validity of blindly assuming that Elber’s effective stress intensity factor is the actual fatigue crack driving force, and that as so it can be used to explain all loa...
Delamination of carbon-fiber strengthening layer from concrete beam during deformation (infrared thermography)
Technology of strengthening reinforced concrete structures with composite materials has found wide application. The effectiveness of strengthening of concrete structures with externally bonded reinforcement is supp...
Esistenza del modo O in piastre tridimensionali con fori circolari ed ellittici soggette a modo II
Il problema di una piastra criccata tridimensionale soggetta a modo II è stato affrontato in letteratura dimostrando che l’effetto del coefficiente di Poisson provoca l’insorgere di una nuova singolarità accoppiata al ca...