Topic
Bending moment
About: Bending moment is a research topic. Over the lifetime, 14577 publications have been published within this topic receiving 158834 citations. The topic is also known as: bending moment.
Papers published on a yearly basis
Papers
More filters
TL;DR: Nickel titanium K files satisfied and far exceeded specification standards for stiffness and met or exceeded the maximum torque at failure standards in all sizes except for the size 40 of the Maillefer Niti, and the size 30 of the MacSpadden Niti.
Abstract: The purpose of this study was to compare stiffness and resistance to fracture of four brands of nickel titanium K files. Instruments of sizes 15 to 40 were tested according to ANSI/ADA Specification No. 28. Resistance to fracture was determined by twisting and measuring the maximum torque and angular deflection at failure. Stiffness was determined by measuring the moment required to bend the instrument 45 degrees. The permanent deformation angle remaining between the tip and the flutes of the instruments after bending ceased was also recorded. Nickel titanium K files satisfied and far exceeded specification standards for stiffness. They also satisfied and exceeded the standards for angular deflection at failure. They met or exceeded the maximum torque at failure standards in all sizes except for the size 40 of the Maillefer Niti, and the size 30 of the MacSpadden Niti. Nickel titanium K files presented a null permanent deformation angle. Clinical studies are required to evaluate the influence of low bending moment on other properties such as breakage and canal transportation.
53 citations
TL;DR: In this article, the effect of delaminations on the load carrying capacity of a large wind turbine blade is studied numerically, and it is concluded that delamination induced near-surface buckling modes have to be considered critical due to an onset of local sublaminate buckling below the design load level.
53 citations
TL;DR: In this article, a computerized method has been developed to aid preliminary design of composite wind turbine blades, which allows for arbitrary specification of the chord, twist, and airfoil geometry along the blade and an arbitrary number of shear webs.
Abstract: A computerized method has been developed to aid preliminary design of composite wind turbine blades. The method allows for arbitrary specification of the chord, twist, and airfoil geometry along the blade and an arbitrary number of shear webs. Given the blade external geometry description and its design load distribution, the Fortran code uses ultimate-strength and buckling-resistance criteria to compute the design thickness of load-bearing composite laminates. The code also includes an analysis option to obtain blade properties if a composite laminates schedule is prescribed. These properties include bending stiffness, torsion stiffness, mass, moments of inertia, elastic-axis offset, and center-of-mass offset along the blade. Nonstructural materials-gelcoat, nexus, and bonding adhesive-are also included for computation of mass. This paper describes the assumed structural layout of composite laminates within the blade, the design approach, and the computational process. Finally, an example illustrates the application of the code to the preliminary design of a hypothetical blade and computation of its structural properties.
53 citations
TL;DR: A general lumped damage simulation model is developed for predicting the fatigue life and the associated crack propagation in the full range of elastic and plastic amplitudes and demonstrates a new perspective for fatigue-induced remaining life quantification for engineering structures.
53 citations
TL;DR: In this article, the effect of the applied load and bending moment gradient on the small amplitude vibration behaviour of the loaded members (beam-columns) is analyzed by means of a very recently developed Generalized Beam Theory (GBT) formulation, which takes into account the geometrically nonlinear stiffness reduction caused by the presence of longitudinal stress gradients and the ensuing shear stresses.
53 citations