Deflection (engineering)

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

Ultimate axial load capacity of a delaminated beam-plate

Abstract: The paper presents elastic buckling and postbuckling analysis of an axially loaded beam-plate with an across-the-width delamination symmetrically located at an arbitrary depth. It is found that, for a relatively short and thick delamination, the buckling load of the delaminated plate is a close lower bound of the ultimate axial load capacity. In the case of a relatively slender delamination, the postbuckling axial load can be considerably greater than the buckling load, while the failure of the plate may or may not be governed by delamination growth. The energy-release rate associated with delamination growth is systematically computed for various combinations of the delamination length and axial load. The resulting curves determine the possibility and the stability characteristics of delamination growth and provide a basis for finding the ultimate axial load capacity. Nomenclature = half-length of delamination = thickness of delamination = half-length of the plate = thickness of the plate =a/t = a/h = axial forces = bending moments w = transverse deflections = bending stiffnesses Young's modulus in the axial direction amplitude of deflection a h / t a a Pi Mf u, v,

Rotorcraft Aerodynamics Models for a Comprehensive Analysis

Abstract: Recent developments of the dynamics models for the comprehensive analysis CAMRAD II are described, specifically advanced models of the geometry and material for the beam component, and a force balance method for calculating section loads. Calculations are compared with measurements for beams undergoing large deflection. Bearingless rotor stability and bending loads calculations are compared with the results from a full-scale wind tunnel test. With a reasonable number of beam elements representing the rotor blade, any large deflection effects are captured by the rigid body motion (which is always exact), and a second-order model of the beam element elastic motion is adequate. The deflection method gives unacceptable results for the structural loads in practical cases, and even with uniform blade properties. The force balance method described here gives good results for blade load, without requiring a large number of nodes.

X-ray source with shaped radiation pattern

Abstract: This invention is directed to an x-ray source comprising a housing (12), a power supply (12A), an elongated tubular probe (14), a target assembly (26), and a beam steering assembly (29). The housing encloses an electron beam source (22), and has elements for generating an electron beam along a beam path. The power supply (12A) is programmable to control the voltage, current and timing of an electron beam. The elongated tubular probe (14) extends along a central axis from the housing (12) about the beam path. The target assembly (26) extends along the central axis and is adapted for coupling to end of the probe (14) distal from the housing (12). The target assembly (26) includes target element (26A) positioned along the beam path, wherein the target element (26A) is adapted to emit x-rays in a predetermined spectral range in response to incident electrons. The beam steering assembly (29) includes a deflection element (30), a feedback network (31) and a deflection controller (144). The deflection element (30) deflects the beam from a nominal axis to a selected surface region on the target element (26) in response to a deflection control signal. The feedback network (31) includes deflection sensing elements for sensing the deflection of the beam and elements for generating a feedback signal representative thereof.