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Michael D. Todd
University of California, San Diego
253Publications
29H-index
2,831Citations
Publications 253
Newest
Mayank Chadha2
Estimated H-index: 2
(University of California, San Diego),
Michael D. Todd29
Estimated H-index: 29
(University of California, San Diego)
In this paper, we present an improved methodology for the global shape reconstruction of rod-like structures that capture the effect of curvature, shear, torsion, axial deformation, and Poisson’s transformation. The inclusion of Poisson’s effect relaxes Euler-Bernoulli’s rigid cross-section assumption such that the cross-section could now undergo planar deformation (shrinking or expansion in the same plane). This scenario is particularly useful for the inflatable structures and pipelines subject...
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Michael Siu Hey Leung (Imperial College London), Joseph Corcoran3
Estimated H-index: 3
(Imperial College London),
Peter Cawley35
Estimated H-index: 35
(Imperial College London)
... more
Abstract The ability to perform accurate remnant life predictions is crucial to ensure the integrity of engineering components that experience fatigue loading during operation. This is conventionally achieved with periodic inspections, where results from non-destructive evaluation and estimation of the operating conditions are obtained to perform remnant life predictions using empirical crack growth laws. However, remnant life predictions made with this approach are very sensitive to their input...
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Michael D. Todd29
Estimated H-index: 29
(University of California, San Diego),
William Gregory1
Estimated H-index: 1
,
Christopher T. Key ... more
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Jin-Song Pei7
Estimated H-index: 7
(University of Oklahoma),
Joseph P. Wright8
Estimated H-index: 8
(Weidlinger Associates),
François Gay-Balmaz13
Estimated H-index: 13
(École Normale Supérieure)
... more
Choosing state variables in a state-space representation of a nonlinear dynamical system is a nonunique procedure for a given input–output relationship and therefore a potentially challenging task. It can be even more challenging when there are piecewise-defined restoring forces, as in bilinear hysteresis or Bouc–Wen models, which are just two of many such engineering mechanics models. Using various piecewise-smooth models, we make use of flow- and effort-controlled system concepts, common to bo...
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Mayank Chadha2
Estimated H-index: 2
(University of California, San Diego),
Michael D. Todd29
Estimated H-index: 29
(University of California, San Diego)
Abstract In this paper, we investigate the coupling of Poisson’s and warping effect for a general asymmetric cross-section of Cosserat beam. We present the challenges and inconsistencies observed as a result of our attempt to couple the two effects. The fully-coupled Poisson’s transformation is then developed to describe the in-plane deformation for the prismatic beam. A comprehensive kinematic treatment of geometrically exact and nonlinear Cosserat beam subjected to large deformation and finite...
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2018 in Sensors
Sumit Gupta2
Estimated H-index: 2
,
Han-Joo Lee , Kenneth J. Loh18
Estimated H-index: 18
... more
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Mike Yeager1
Estimated H-index: 1
,
Bill Gregory1
Estimated H-index: 1
,
Chris Key1
Estimated H-index: 1
... more
In this study, a damage detection and localization scenario is presented for a composite laminate with a network of embedded fiber Bragg gratings. Strain time histories from a pseudorandom simulated operational loading are mined for multivariate damage-sensitive feature vectors that are then mapped to the Mahalanobis distance, a covariance-weighted distance metric for discrimination. The experimental setup, data acquisition, and feature extraction are discussed briefly, and special attention is ...
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2018 in Ultrasonics [IF: 2.33]
See Yenn Chong1
Estimated H-index: 1
(University of California, San Diego),
Michael D. Todd29
Estimated H-index: 29
(University of California, San Diego)
Abstract Numerous Lamb wave dispersion curve estimation methods have been developed to support damage detection and localization strategies in non-destructive evaluation/structural health monitoring (NDE/SHM) applications. In this paper, the covariance matrix is used to extract features from an ultrasonic wavefield imaging (UWI) scan in order to estimate the phase and group velocities of S0 and A0 modes. A laser ultrasonic interrogation method based on a Q-switched laser scanning system was used...
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Changjiang Liu3
Estimated H-index: 3
(Chengdu University of Technology),
Michael D. Todd29
Estimated H-index: 29
(University of California, San Diego),
Zhoulian Zheng10
Estimated H-index: 10
(Chongqing University)
... more
Author(s): Liu, CJ; Todd, MD; Zheng, ZL; Wu, YY | Abstract: © 2017, © The Author(s) 2017. The pretension of building membrane structures may relax over its service lifetime, which may cause engineering failure under external loads. Therefore, the pretension of building membrane structures should be monitored or estimated regularly to compare the actual pretension to its design pretension and then to adopt some strengthening measures to mitigate future problems. Based on the geometrically nonline...
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