Deflection (engineering)

About: Deflection (engineering) is a research topic. Over the lifetime, 30862 publications have been published within this topic receiving 298849 citations.

Analytical modeling and optimization for a laterally-driven polysilicon thermal actuator

Abstract: An electro-thermally and laterally driven microactuator is analytically examined which is based on the asymmetrical thermal expansion of the microstructure with different lengths of two beams. Deflection of the microactuator is modeled by the structural analysis. Analytical results are compared with the finite element model (FEM) results, and show a reasonable agreement. The magnitude of the deflection depends strongly on the geometry of the microactuator. The analytical model allows one to optimize efficiently the laterally driven thermal actuators.

Hybrid deflection prediction on machining thin-wall monolithic aerospace components:

Abstract: Thin-wall machining of monolithic parts allows better quality parts to be manufactured in less time This brings advantages, particularly in inventory management and manufacturing efficiency However, due to poor stiffness of thin-wall parts, deformation is more likely to occur in the machining process, which results in dimensional form errors This paper describes a new methodology for prediction of wall deflection during machining thin-wall features with reduced analysis time from weeks to hours The prediction methodology is based on a combination of the finite-element method and statistical analysis It consists of a feature-based approach to parts creation, finite-element analysis of material removal, and statistical regression analysis of deflection associated with cutting parameters and component attributes The prediction values have been validated by machining tests on titanium parts and show good agreement between simulation model and experimental data

Large deflections of an end supported beam subjected to a point load

Abstract: Treated herein is a class of large deflection beam problems where one end of the beam is being held while the other end portion is allowed to slide freely over a frictionless support fixed at a distance from this end. The elastic beam is subjected to a point load. This highly non-linear problem is solved using both the elliptic integral method and the shooting-optimization technique, thus providing independent checks on the solutions. This kind of problem features: (1) the possibility of two possible equilibrium solutions for a given load magnitude; and (2) a maximum (or critical) load and a maximum deformed arc-length for equilibrium.

Debonding of carbon-fibre-reinforced polymer plate from concrete beams.

Abstract: The overall aim of the study reported in this paper was to examine the plate-debonding phenomenon when carbon-fibre-reinforced polymer (CFRP) laminates are used as externally bonded additional reinforcement to strengthen reinforced concrete beam structural elements. The main variables investigated include the amount of tension reinforcement, the concrete strength, the amount of shear reinforcement and the location and arrangement of externally bonded anchorages. Six strengthened reinforced concrete beams, 150 × 250 × 3000 mm in size, with externally bonded unidirectiona CFRP laminates, were tested under four-point bending over an effective span of 2800 mm. The distinguishing feature in the design of the beams was the arrangement and location of the externally bonded anchorages. The beams were extensively instrumented, and deflection, concrete/ steel/plate strain and the plate-debonding process were continuously monitored during load testing to failure. The results of the tests were then critically analysed. It is shown that plate debonding in a sudden, brittle manner is a major problem associated with CFRP plate-bonding technology. Carefully designed external anchorages and lateral confinement of the compression zone are shown to be very effective in enhancing the overall performance of the strengthened beams and the utilization of the CFRP sheet.