Results 121 to 130 of about 1,447 (166)
Some of the next articles are maybe not open access.
The influence of geometrical imperfections in the method of caustics
Engineering Fracture Mechanics, 1983Abstract The influence of locally varying specimen thickness on the shape of the shadow spot and, hence, on the stress intensity factor is of first order but for all practical cases comparable with the experimental data scatter.
openaire +1 more source
On the Geometrical Imperfections in Cylindrical Roller Bearings
Journal of Tribology, 1988Computer simulations of the dynamics performance of roller bearings, as obtained by the computer code ADORE, are used to model the infuence of race out-of-roundness, race taper and centrality of land on partly crowned rollers. Both oil and solid lubricated high-speed roller bearings are considered and the overall performance parameters, such as ...
openaire +1 more source
On geometric reduction of age or intensity models for imperfect maintenance
Reliability Engineering & System Safety, 2017Abstract There is an extensive literature on imperfect maintenance models. Among them, we have proposed in Doyen and Gaudoin (2004) [13] the classes of ARA and ARI models. These models express the effect of maintenance by an Arithmetic Reduction of Age (for ARA models) and an Arithmetic Reduction of Intensity (for ARI models).
Doyen, Laurent +2 more
openaire +2 more sources
Applied Mechanics and Materials, 2014
The buckling loads of shell structures and shell-like space frames are very sensitive to initial geometric imperfections. Previous studies focused on estimating the lower bound of the load-carrying capacity of reticulated shells. This paper proposes a new method for modelling structural geometrical imperfections based on random field theory. The method
Geng Bo Chen +3 more
openaire +1 more source
The buckling loads of shell structures and shell-like space frames are very sensitive to initial geometric imperfections. Previous studies focused on estimating the lower bound of the load-carrying capacity of reticulated shells. This paper proposes a new method for modelling structural geometrical imperfections based on random field theory. The method
Geng Bo Chen +3 more
openaire +1 more source
IMPROVEMENT OF SAFTEY OF COLUMNS WITH GEOMETRICAL IMPERFECTIONS IN FRAME STRUCTURES
8th International Professional and Scientific Conference Occupational safety and health, 2022In this paper derivation of differential equation describing buckling of a column with initial geometrical imperfections and variable cross – section is presented. The column geometry (the cross section) is changeable (variable), for the purpose of achieving higher load carrying capacity at given load set with optimizing the material quantity.
Hoster, Josip +2 more
openaire +1 more source
On Loads Equivalent to Geometrical Imperfections in Shells
Journal of Engineering Mechanics, 1993The equations that define the load equivalent to an imperfection in the geometry (in the form of a deviation from the as-designed midsurface) of a thin shallow shell are considered. The present formulation defines initial displacements and an initial strain field in order to model the imperfection.
openaire +1 more source
Geometrical Imperfections on Inelastic Frame Behavior
Journal of Structural Engineering, 1992A methodology for the analysis of geometrically imperfect framed structures that takes into consideration geometrical and material nonlinearities is presented. The analysis is an extension of the pseudo-load method for geometrical and material nonlinear frame analysis by Lui in 1988, and Lui and Zhang in 1990.
openaire +1 more source
Optimization of slender structures considering geometrical imperfections
Inverse Problems in Science and Engineering, 2006In this article, we present an optimization model which incorporates uncertainty induced by geometrical imperfections. Within the model, geometrical imperfections are represented by means of random fields. The induced uncertainties are then treated using the concept of a convex model.
M. Baitsch, D. Hartmann
openaire +1 more source
Hyperbolic Cooling Towers with Geometric Imperfection
1986Geometric imperfection is probably one of the most common and important constructional errors, which occurs in the construction of large thin concrete shells, such as cooling towers.
openaire +1 more source
IEEE Transactions on Robotics, 2010
Actuation redundancy increases and homogenizes the kinematic dexterity and stiffness as well as the force distribution among the actuators of parallel-kinematics machines (PKMs). It also allows for internal prestresses within the PKM without affecting the environment that can potentially be used to account for secondary tasks, such as active stiffness ...
openaire +2 more sources
Actuation redundancy increases and homogenizes the kinematic dexterity and stiffness as well as the force distribution among the actuators of parallel-kinematics machines (PKMs). It also allows for internal prestresses within the PKM without affecting the environment that can potentially be used to account for secondary tasks, such as active stiffness ...
openaire +2 more sources