Journal ArticleDOI
Two methods for determining impact-force history on elastic plates
TLDR
In this paper, two methods are presented to detect the impact-force history on elastic plates, one involves construction of a Green's function to relate the strain responses to an impact force acting axisymmetrically on a circular plate.Abstract:
Two methods are presented to detect the impact-force history on elastic plates. The first method involves construction of a Green’s function to relate the strain responses to an impact force acting axisymmetrically on a circular plate. The classical plate theory and a series of Bessel functions were used to obtain the Green’s functions in the time domain. The gradient projection method was employed to search for the optimal force history. Examples using circular plates with free and fixed boundary conditions are demonstrated. On the other hand, the second method is purely experiment-based and involves no Green’s function. Thus, this method can be applied to structures of various geometries, boundary conditions and material properties. The very satisfactory agreement between the measured and the detected force histories using both methods shows that they are reliable for impact-force determination purposes.read more
Citations
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Journal ArticleDOI
Force reconstruction: analysis and regularization of a deconvolution problem
TL;DR: In this paper, a deconvolution technique is proposed to solve the problem of reconstructing the impact force versus the location of the point of impact impact, which is a well-known ill-posed problem: the results are often unstable.
BookDOI
Impact behaviour of fibre-reinforced composite materials and structures
Stephen R Reid,G. Zhou +1 more
TL;DR: In this paper, the impact damage assessment of fiber-reinforced composites using small specimens has been studied, and the impact model was used to model the impact of composite structures.
Journal ArticleDOI
Impact identification of stiffened composite panels: I. System development
Robert E. Seydel,Fu-Kuo Chang +1 more
TL;DR: In this article, a real-time identification technique for the prediction of the location and force history of low-velocity impacts on composite panels with beam stiffeners was developed, based on the difference between modeled response and actual response.
Journal ArticleDOI
Review of inverse analysis for indirect measurement of impact force
Journal ArticleDOI
On the Inverse Problem of Rectangular Plates Subjected to Elastic Impact, Part I: Method Development and Numerical Verification
Ching-Shih Yen,Enboa Wu +1 more
TL;DR: In this paper, a method to identify both the impact location and the transverse impact force history from the strain responses at certain points on a rectangular plate is presented, where the governing equations of the plate were obtained by applying the Reissner-Mindlin plate theory and the Rayleigh-Ritz method.
References
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Journal ArticleDOI
Use of Statical Indentation Laws in the Impact Analysis of Laminated Composite Plates
Tein-Min Tan,C.T. Sun +1 more
TL;DR: In this article, the impact response of graphite/epoxy laminates was investigated theoretically and experimentally using a nine-node isoparametric plate finite element in conjunction with an empirical contact law.
Journal ArticleDOI
The Development of a Substitute Bird Model
James S. Wilbeck,James L. Rand +1 more
TL;DR: A comprehensive program was conducted to develop a model synthetic bird for use in engine blade impact testing and it was determined that a projectile fabricated from commercial gelatin impregnated with phenolic mircoballoons most nearly duplicated the impact loading history of real birds.
Journal ArticleDOI
Determining the contact force during the transverse impact of plates
TL;DR: In this article, the contact force during the transverse impact of a plate is determined from dynamic strain-gage measurements made on the plate, and comparisons are made with finite-element predictions and measurements from a force transducer.
Journal ArticleDOI
Impact force identification using the general inverse technique
P.E. Hollandsworth,H.R. Busby +1 more
TL;DR: In this paper, a spectrum analyzer was used to measure the beam accelerations within 40 μs time intervals, and the accelerations were integrated so that the response was in suitable velocity form for use in the inverse algorithm.
Journal ArticleDOI
Experimentally determining the contact force during the transverse impact of an orthotropic plate
TL;DR: In this paper, the impact of a scotchply laminated composite was investigated using strain gauge measurements made on an impacted plate to infer the contact force history, and experimental results for the impact were presented.
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On the Inverse Problem of Rectangular Plates Subjected to Elastic Impact, Part I: Method Development and Numerical Verification
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