title: Fracture of fiber-reinforced composites analyzed via acoustic emission.
abstract: This study investigated the fracture resistance of composite resins using a three-point bending test and acoustic emission (AE) analysis. Three groups of specimens (n=15) were prepared: non-reinforced BelleGlass HP composite (NRC), unidirectional (UFRC) and multidirectional (MFRC) fiber-reinforced groups which respectively incorporated unidirectional Stick and multidirectional StickNet fibers. Specimens were loaded to failure in a universal testing machine while an AE system was used to detect audible signals. Initial fracture strengths and AE amplitudes were significantly lower than those at final fracture in all groups (p<0.05). Initial fracture strength of UFRC (170.0 MPa) was significantly higher than MFRC (124.6 MPa) and NRC (87.9 MPa). Final fracture strength of UFRC (198.1 MPa) was also significantly higher than MFRC (151.0 MPa) and NRC (109.2 MPa). Initial and final fracture strengths were significantly correlated (r=0.971). It was concluded that fiber reinforcement improved the fracture resistance of composite resin materials and the monitoring of acoustic signals revealed significant information regarding the fracture process.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, University of Jordan.
authors.forename: Nadia S
authors.initials: NS
authors.lastname: Ereifej
authors.forename: Yara G
authors.initials: YG
authors.lastname: Oweis
authors.forename: Sandra K
authors.initials: SK
authors.lastname: Altarawneh
mesh_terms: D000162:Acoustics; D003188:Composite Resins / Q000592:standards*; D019245:Compressive Strength; D003764:Dental Materials / Q000592:standards*; D003799:Dental Stress Analysis; D004548:Elasticity; D019544:Equipment Failure Analysis; D008422:Materials Testing; D018583:Pliability; D013314:Stress, Mechanical; D013718:Tensile Strength
chemical_list: D003188:Composite Resins; D003764:Dental Materials