Year-end Sale % OFF 
Abstract
AbstractA systematic comparison of the tensile and compressive response of glass ceramic Macor, with zero porosity and low density, is carried out by using flattened Brazilian disk and cylindrical specimen from quasi-static to dynamic loading conditions. The experiments were performed on a screw driven Zwick machine and an in-house built split Hopkinson bar synchronized with a high speed photographic system. Likewise, the loading rate dependent fracture toughness is also investigated by using a notched semi-circular Brazilian disk. A digital image correlation technique is adopted to assist in the monitoring of strain field, crack initiation and propagation under dynamic loading conditions. Both tensile and compressive strength show loading rate dependencies, however, the static and dynamic tensile strengths are only 20% of the compressive strengths without confinement and less than 10% of the confined compressive strength. The microstructural characterization reveals the fracture mechanisms in unconfined Macor are predominantly transgranular with mica platelets and cleavage planes, which are influenced by the loading mode and loading rate. However, the Macor with confinement shows ductile fracture micrographs with a shear localization zone consisting of fine particles. With the use of Macor ceramic as a model material, the paper presents an economical approach to investigate the loading mode and pressure dependent failure of ceramic materials. This will support the characterization of dynamic properties of current and future developed advanced ceramics for demanding applications in the aero engine.
Highlights
Advanced ceramic materials with high hardness and relatively low density are very attractive for structural applications
The wide use of advanced ceramic materials requires an understanding of their deformation and failure mechanism, which will benefit the optimization of the structural design
This paper reports the loading rate dependent tensile strength, compressive strength and fracture toughness of a glass ceramic Macor
Summary
Advanced ceramic materials with high hardness and relatively low density are very attractive for structural applications. The ceramics employed in aerospace engineering and armour design always undergo high speed deformation process, as can be found in the works of Townsend and Field [3, 4], Bourne and Rosenberg et al [5, 6] in the Cavendish Laboratory. Analysis of such impact events requires the understanding of dynamic mechanical properties of ceramic materials. The Brazilian test, as a typical indirect test which is convenient to conduct through the far filed compressive loading technique [8, 9], has been increasingly popular for the study of the tensile response of brittle materials [10]. The Brazilian test with an arc form anvil for the contact surface was proposed by Mellor and Hawkes [11], in order to reduce
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
