Improvement of fracture resistance in a glass matrix optomechanical composite by minicomposite unit bridging

Minicomposite unit bridging, which was experimentally determined to be the dominant toughening mechanism resulting in the R-curve behavior of the Al2O3-ZrO2 minicomposite-reinforced glass matrix optomechanical composite, was studied quantitatively using luminescence spectroscopy. Applied stress induced shift of the luminescence bands of the minicomposite reinforcement was calibrated. Using the experimentally obtained calibration curve, axial stresses could be mapped along the minicomposite embedded in the glass matrix. In situ fracture mechanical test of the fabricated glass matrix optomechanical composite was conducted using a specially designed loading system that can be placed under a high-resolution micro-Raman spectrophotometer. Axial minicomposite stress distributions were mapped in the matrix-cracked optomechanical composite, and its interfacial properties were determined using the obtained stress profiles. The apparent interface shear frictional stress in the present composite was determined to be similar to 75 MPa. Using the obtained interfacial properties and crack opening displacement versus crack length relations, R-curve behavior of the optomechanical composite was studied quantitatively assuming that minicomposite unit bridging is the only toughening mechanism operative in the structure. Theoretical prediction agreed well with the experimentally obtained R-curve of the glass matrix optomechanical composite, which proves the dominance of minicomposite unit bridging in the improvement of its fracture resistance.


Mechanical behaviour of Al2O3-ZrO2 minicomposite reinforced glass matrix optomechanical composite
Dericioğlu, Arcan Fehmi (Informa UK Limited, 2003-08-01)
To understand the effect of a 'mesh-structured reinforcement' on the optical and mechanical properties of optomechanical composites, a unidirectional Al2O3 fibre-ZrO2 matrix minicomposite reinforced glass matrix optomechanical composite has been fabricated. By regular alignment of the minicomposites in the glass matrix as part of the 'mesh structure' a high degree of optical transparency is obtained in the composite; this transparency is proportional to its 'optical window' regions. The mesh structured rein...
Investigation of the variations in microstructure and mechanical properties of dual-matrix ductile iron by Magnetic Barkhausen Noise analysis
Gür, Cemil Hakan; Erdogan, Mehmet (Informa UK Limited, 2008-01-01)
The variations in the microstructure and tensile properties of dual-matrix ductile irons have been investigated non-destructively by Magnetic Barkhausen Noise (MBN) method. Specimens have been intercritically austenitised at 795 degrees C and 815 degrees C for 20 minutes, and then oil-quenched to obtain different martensite volume fractions. Two specimens, namely as-cast and oil-quenched from 900 degrees C, were prepared for comparison purpose. To investigate the effect of tempering, some specimens were tem...
A study of phase stability and mechanical properties of hydroxylapatite-nanosize alpha-alumina composites
Evis, Zafer (Elsevier BV, 2007-04-01)
Hydroxylapatite (HA)-nanosize alumina composites were synthesized to study their phase stability and mechanical properties. To make these composites, nanosize alpha-Al2O3 powder was used because of its better sinterability and densification as compared to nanosize gamma-Al2O3. The composites were air sintered without pressure and hot pressed in vacuum at 1100 degrees C and 1200 degrees C. In the composites, HA decomposed to tricalcium phosphate faster after the air sintering than hot pressing. Moreover, hex...
Extensive deformation behavior of an all-oxide Al2O3-TiO2 nanostructured multilayer ceramic at room temperature
Dericioğlu, Arcan Fehmi; Kagawa, Yutaka (Cambridge University Press (CUP), 2009-11-01)
An all-oxide Al2O3-TiO2 ceramic multilayer composed of 10-100 nm thick alternating layers was fabricated using the reactive magnetron sputtering process. Microindentation tests were carried out on the multilayer ceramic followed by microstructural observations of the cross-sections of the indented sites to characterize the indentation response of the system. During the observations, it was noted that an extensive room temperature "deformation" occurred in the multilayer ceramic material. The material shows ...
Optical characteristics of Bi12SiO20 single crystals by spectroscopic ellipsometry
Isik, M.; Delice, S.; Nasser, H.; Hasanlı, Nızamı; Darvishov, N. H.; Bagiev, V. E. (Elsevier BV, 2020-12-01)
Structural and optical characteristics of Bi12SiO20 single crystal grown by the Czochralski method were investigated by virtue of X-ray diffraction (XRD) and spectroscopic ellipsometry measurements. XRD analysis indicated that the studied crystal possesses cubic structure with lattice parameters of a = 1.0107 nm. Spectral dependencies of several optical parameters like complex dielectric constant, refractive index, extinction and absorption coefficients were determined using ellipsometry experiments perform...
Citation Formats
A. F. Dericioğlu, “Improvement of fracture resistance in a glass matrix optomechanical composite by minicomposite unit bridging,” MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, pp. 142–151, 2005, Accessed: 00, 2020. [Online]. Available: