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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
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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
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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
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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
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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.
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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.
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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.
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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 ...
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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 ...
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Worst Geometric Imperfections of Rods and Shells
2018Various forms of geometric imperfections of compressed rods, which are subjected to loss of stability, have been considered in the normative literature. Similar investigations are also intensively carried out for the shells with imperfections, taking into account sub- and post-critical behavior of the systems, as well as an inelastic deformation of ...
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Investigation of Geometric Imperfection in Inflatable Aerospace Structures
Journal of Aerospace Engineering, 2004Communication and solar array inflated structures must be deployed to a very precise geometric configuration in order to meet quality requirements of their application. The focus of this paper is on geometric imperfections associated with inflated structures.
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Sensitivity of Crack Nucleation Parameters to the Geometric Imperfection
2008In this experimental study, we compared the plane stress crack growth in identical specimens with and without a geometric imperfection. The initial imperfection is intended to trigger a progressive process of single-site necking followed by single-site cracking in a predefined location and direction.
V. P. Naumenko, Yu. D. Skrypnyk
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