This paper investigates the thermo-mechanical constitutive relationships of a CoCrFeNi high-entropy alloy (HEA) from quasi-static 10−2/s, medium strain rate 101/s to high rates 5 × 102/s-1.1 104/s. A series tests, with use cylindrical specimen and shear compression (SCS), were performed on hydraulic Instron machine split Hopkinson pressure bar (SHPB) synchronized high-speed camera. The temperat...

Purpose: In spite of chemical union between acrylic resin teeth and denture base material, detachment particularly anterior is a frequent observation. The purpose this study was to evaluate shear bond strength after incorporating various grooves on the ridge lap area. Materials & Methods: A total 60 samples were prepared divided into two groups with 30 each. Sample in group I processed conv...

As a kind of metamaterial, the negative Poisson’s ratio foams, which expand (shrink) in transverse direction when stretched (compressed) longitudinal direction, have many potential applications fields such as aerospace and mechanical biomedical engineering. In this paper, out-of-plane crushing behaviors four types orthogonal isotropic NPR convex-concave foams (CCF) were extensively studied usin...

Abstract The dynamic necking of ductile metallic rods with large strain reverse loading history has received little attention in the published literature. A novel bespoke real time control setup is constructed to apply directly specimen gauge section up a maximum level ± 0.16. 304L stainless steel used as model material this study. subsequent tensile tests loaded specimens are performed from qu...

No entirely reliable method exists for assessing union during Ilizarov treatment. Premature removal results in potential treatment failure; hence, alternative methods warrant investigation. Wire deflection might provide an indication of fracture site deformation on weight bearing, indicating progress towards union. This study aimed to test a method for assessing wire deflection within an Ilizar...

The paper presents the experimental results of mechanical behavior Ti-5Al-2.5Sn alloy at high strain rates and elevated temperature. Flat smooth notched specimens with notch radii 10 mm, 5 2.5 mm were used. studies carried out using high-velocity servo hydraulic test machine Instron VHS 40/50-20. samples heated flat ceramic infrared emitters on average between 60 s 160 s. temperature control in...

This paper describes the transition towards a composite structure, with same overall aerodynamic characteristics, for tail rotor blade of an IAR330 helicopter. The newly proposed structure is made carbon-roving spar embedded epoxy resin, hexagonal-cell honeycomb core manufactured by fused deposition modelling, and outer skin multiple carbon-fibre-reinforced laminae. was authors using hand lay-u...

statement of the problem: the survival of pulpless teeth restored with different post and core systems is still a controversial issue. purpose: this study compared the retention of two different post and core systems and also the fracture resistance of teeth restored with these systems. material and method: eighty endodontically treated maxillary central incisors were sectioned perpendicular to...

background: the purpose of this study was to evaluate the influence of three different luting protocols on shear bond strength of computer aided design/computer aided manufacturing (cad/cam) resin nanoceramic (rnc) material to dentin. materials and methods: in this in vitro study, 30 disks were milled from rnc blocks (lava ultimate/3m espe) with cad/cam technology. the disks were subsequently c...