An analytical model is provided for the piezoresistive phenomenon of continuous carbon fiber polymer–matrix composite under flexure. This phenomenon allows strain sensing and entails reversible increase of the tension surface resistance and reversible decrease of the compression surface resistance during flexure. The model considers the surface resistance change to be due to change in the degre...

In this paper, the design of a new compliant XYZ totally decoupled parallel-kinematic nanopositioning stage based on flexure mechanism is presented, which is driven by PZT actuators. The output of the flexure stage is enlarged by a compound amplifier of three order based on bridge principle with the amplification ratio of As which is larger than the ratio of As for one simple amplifier. The thr...

This paper presents the study of strengthening R/C beams with large circular and square opening located at flexure zone by Carbon Fiber Reinforced Polymer (CFRP) laminates. A total of five beams were tested to failure under four point loading to investigate the structural behavior including crack patterns, failure mode, ultimate load and load deflection behaviour. Test results show that large o...

The architecture optimization of a newly designed flexure XY parallel micro-manipulator with both input and output decoupling is conducted in this paper. In view of the compliance of flexure hinges, the input stiffness model of the motion stage are established based upon the matrix method, and then the dynamic equation is derived through the Lagrangian approach, which is verified by the modal a...

Heterodyne hologram interferometry was used to study load-deformation characteristics of computer microcomponents that were surface mounted on a printed circuit board. The board was assembled as a cantilever plate and subjected to cyclic flexure loading according to industry standards. The flexure loading was sinusoidal at 0.1 cps with an amplitude of 1.25 mm (0.050 in.) at the tip of the board...

Clinically, fractures are the main cause of computer-aided design and computer-aided manufacturing (CAD/CAM) 3 mol%-yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) all-ceramic dental restorations failure because of repetitive occlusal loading. The goal of this work is to study the effect of test methods and specimen's size on the flexural strength of five ceramic products. Both bi-axi...

In this study the influence of tubule orientation on the strength of human dentin under static and cyclic loads was examined. Rectangular beams were sectioned from the coronal dentin of virgin extracted molars (N=83) and then loaded in quasi-static 4-point flexure or 4-point flexural fatigue to failure. The flexure strength, energy to fracture and fatigue strength were evaluated for specimens w...

This paper addresses the problem of certifying the performance of a precision flexure-base mechanism design with respect to the given constraints. Due to the stringent requirements associated with flexure-based precision mechanisms, it is necessary to be able to evaluate and certify the performance at the design stage, taking into account the possible sources of errors: such as fabrication tole...