Full-Field Deformation Measurements of Aluminum Plates Under Free Air Blast Loading

Spranghers, Ken; Vasilakos, Ioannis; Lecompte, David; Sol, Hugo; Vantomme, John

doi:10.1007/s11340-012-9593-5

Cited by 51 publications

(30 citation statements)

References 15 publications

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“…Centrosymmetry is a significant and common deformation type that occurs in almost all types of 3D deformations, such as the 3D deformation of a spherical pressure vessel or indentation [21,22], caused by impact waves [18,19,[23][24][25],and in bulge experiments [26,27]. A multi-scale static and dynamic 3D deformation measurement technique was developed in this study on the basis of the characteristics of centrosymmetric deformation.…”

Section: Introductionmentioning

confidence: 99%

Centrosymmetric 3D Deformation Measurement using Grid Method with a Single-Camera

Wen

Liu

et al. 2016

Exp Mech

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This study proposes an effective method to measure centrosymmetric 3D static and dynamic deformations from the microscale to macroscale using grid method with a single camera. The camera was tilted at a particular angle and used to observe specimen grids in order to acquire coupling fields of both in-plane and out-of-plane displacement. This study also analyzes the decoupling methods of these two displacement types, and a systematic deduction of a theoretical equation for 3D deformation analysis was conducted based on the method. The sensitivity of morphology measurement was then evaluated and the elimination of noise and rotational errors was discussed. The efficiency and accuracy of this technique was verified through a microscale static feasibility test and a highspeed impact experiment that simulated an underwater explosion. The proposed approach uses minimal equipment, is simple and convenient, and can be used to measure centrosymmetric 3D deformation in multi-scale both statically and dynamically. In addition, this method avoids the nonsynchronization problem of a pair of high-speed cameras in high-speed 3D measurements.

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Section: Introductionmentioning

confidence: 99%

Centrosymmetric 3D Deformation Measurement using Grid Method with a Single-Camera

Wen

Liu

et al. 2016

Exp Mech

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“…In the literature, several types of materials are considered such as composites [5][6][7][8][9][10][11][12][13], and metals [4,[14][15][16][17][18][19][20]. The blast load is generated using different techniques: free air detonation of a high explosive (HE) [4,5,12,13,18,19], using a gas driven shock tube [6][7][8][9][10][11]14] or an explosive driven shock tube (EDST) [6,15,20]. Several practical problems related to the use of free air explosions are reported in Refs.…”

Section: Introductionmentioning

confidence: 99%

“…In order to experimentally analyse the response of specimens under an impulsive loading, several methods are applied such as high-speed imaging with digital image correlation (DIC) to measure the full-field deformations [4][5][6][7][8][9][10][17][18][19], strain gauges [9], ballistic pendulum (for impulse measurement) [12,15,20], macroscopic and/or microscopic examination [5][6][7][8][9][10][11][12], and residual compressive strength measurements [7,11]. This paper reports a series of experiments with EDST generated blast loading and free air blast loading of thin square aluminium plates.…”

Section: Introductionmentioning

confidence: 99%

Explosive driven shock tube loading of aluminium plates: experimental study

Louar

Belkassem

Ousji

et al. 2015

International Journal of Impact Engineering

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“…Digital image correlation (DIC) has been used to study the full-field dynamic deformation of plates [14,15,16,17,18,19]. DIC uses two high-speed video (HSV) cameras filming in stereo to gain a 3-dimensional perspective of the subject of interest.…”

Section: Introductionmentioning

confidence: 99%

“…Whilst DIC offers a more complete description of the response of the target structure, it has several limitations. DIC systems are expensive and therefore explosive experiments require heavily engineered structures to protect the equipment; such protection has been achieved in small-scale testing (40 g C4 charge) by embedding the target within a larger reflecting surface [17,18], but is impractical for medium to large-scale tests. Alternatively the DIC system can simply be moved further from the explosive event, however the distance the DIC system can be moved from the target is limited by the geometry of the test set-up and is a function of the desired target resolution, focal length of the lens, and the distance required between each HSV camera, which increases as distance from the target increases.…”

Section: Introductionmentioning

confidence: 99%

Displacement timer pins: An experimental method for measuring the dynamic deformation of explosively loaded plates

Fay

Rigby

Tyas

et al. 2015

International Journal of Impact Engineering

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The measurement of dynamic deformation of an explosively loaded plate is an extremely onerous task. Existing techniques such as digital image correlation are expensive and the equipment may be damaged by explosively driven debris/ejecta, particularly if it is necessary to locate such equipment close to loaded elements which are likely to fail. A new, inexpensive and robust measurement technique for use in full-scale blast testing is presented, which involves the placement of displacement timer pins (DTPs) at pre-defined distances from the rear surface of the centre of a plate. A strain gauge on the perimeter of each pin records the time at which the plate comes into contact with the end of each DTP and hence has deformed to that value of displacement, giving a direct measure of the time-varying deformation at a discrete point on the plate. An experimental proof-of-concept was conducted and the results are compared with numerical displacements determined using LS-DYNA. The numerical and experimental results were in very good agreement, which suggests that the proposed experimental method offers a valuable means for determining the full-scale response of structures subjected to blast loads in aggressive environments. Further improvements to the experimental procedure are outlined, along with applications where the DTPs are particularly suited.

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Full-Field Deformation Measurements of Aluminum Plates Under Free Air Blast Loading

Cited by 51 publications

References 15 publications

Centrosymmetric 3D Deformation Measurement using Grid Method with a Single-Camera

Centrosymmetric 3D Deformation Measurement using Grid Method with a Single-Camera

Explosive driven shock tube loading of aluminium plates: experimental study

Displacement timer pins: An experimental method for measuring the dynamic deformation of explosively loaded plates

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