Experimental and Numerical Investigations on Deformation of Cylindrical Shell Panels to Underwater Explosion

Ramajeyathilagam, K.; Vendhan, C.P.; Rao, V. Bhujanga

doi:10.1155/2001/798735

Cited by 19 publications

(8 citation statements)

References 18 publications

(30 reference statements)

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“…Plastic Explosive Kirkee (PEK) obtained from the High Explosive Factory, Khadki, Pune, India was used for generating the blast loading. It has a TNT equivalent (weight) of 1.17 22 and comprised of 85 per cent Trinitrophenylmethylnitramine (Tetryl). The explosive stand-off distance was kept as 1.5 m from the top surface of composite plate in all experiments.…”

Section: Materials Experimental Setup and Instrumentationmentioning

confidence: 99%

Mitigation of Blast Induced Acceleration using open cell natural rubber and Synthetic Foam

et al. 2019

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In addition to high pressure generated by explosion, the induced high acceleration can also cause severe injuries to occupants and structural damage, especially in anti-vehicular land mine blast scenario. This problem has not been studied well and only few techniques to reduce the deadly effect of high acceleration are reported in literature. In the present work, the mitigation of blast induced acceleration using add-on layers of open cell natural rubber and synthetic foam on rigidly fixed composite plate has been studied experimentally under increasing blast wave strengths. The blast wave strength was varied by increasing quantity of plastic explosive from 0.150 kg to 0.550 kg. The induced vibration in the composite plate due to impingement of blast wave was measured in terms of acceleration using piezoelectric accelerometer. It was observed that the sharp rising acceleration signals were transformed into a slowly rising and low amplitude signals with the addition of foam. The mitigation of high frequencies and amplitude of acceleration signals was also verified with the fast Fourier transform study. The rubber foam shows better acceleration mitigation than synthetic foam. This study has suggested that the material like rubber and synthetic foam can be used for mitigating the acceleration resulting from the impact of blast wave.

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Section: Materials Experimental Setup and Instrumentationmentioning

confidence: 99%

Mitigation of Blast Induced Acceleration using open cell natural rubber and Synthetic Foam

et al. 2019

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“…For the PEK explosive of 30 g, the peak pressure value is calculated, taking into account the fact that shock effect of 1 g of PEK equals that of 1.17 g of TNT 20 . The expected peak free-field pressure on the dome due to 30 g of PEK placed at a distance of 0.95 m is estimated to be 2302 psi (15.87 MPa).…”

Section: Experimental Study 21 Estimation Of Shock Pressurementioning

confidence: 99%

Response of Dome-enclosed Box-type Structure to Underwater Explosion

Nandagopan¹,

Azeez²,

Nandakumar³

2013

DSJ

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In the development of underwater sensor systems, the sensor arrays are configured for different shapes like cylindrical, rectangular and spherical depending on the requirement. The rectangular shaped box-type structure discussed here has both top and bottom ends open. Flanges stiffen the top and bottom ends, and gussets are used to connect the flanges with the structure. In this paper, the box-type structure is subjected to non-contact underwater explosion in a shock tank to study the peak free field pressure on the structure. To simulate the actual conditions, the structure is placed in free flooded area and covered with a dome. The free-field peak pressure on the dome and structure are plotted with time. The measured pressure curves are in agreement with the empirical predictions reported in literature. It is concluded that around 85 per cent of the shock impulse acting on the dome is transmitted to the box-type structure. The dome and box-type structure withstood the explosive load, thereby validating their design.

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“…In a pure experimental study, Brett et al [2] investigated near-field explosion effect on mild steel cylindrical shells. Ramajeyathilagam et al [3] investigated cylindrical shell panels subjected to underwater explosion loading experimentally and numerically. They implemented different span ratios of air-backed panels.…”

Section: Introductionmentioning

confidence: 99%

Incremental Explosive Analysis and Its Application to Performance-Based Assessment of Stiffened and Unstiffened Cylindrical Shells Subjected to Underwater Explosion

Biglarkhani¹,

Sadeghi²

2017

Shock and Vibration

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Incremental explosive analysis (IEA) is addressed as an applicable method for performance-based assessment of stiffened and unstiffened cylindrical shells subjected to underwater explosion (UNDEX) loading. In fact, this method is inspired by the incremental dynamic analysis (IDA) which is a known parametric analysis method in the field of earthquake engineering. This paper aims to introduce the application of IEA approach in UNDEX in order to estimate different limit states and deterministic assessment of cylindrical shells, considering the uncertainty of loading conditions. The local, bay, and general buckling modes are defined as limit states for performance calculation. Different standoff distances and depth parameters combining several loading conditions are considered. The explosive loading intensity is specified and scaled in several levels to force the structure through the entire range of its behavior. The results are plotted in terms of a damage measure (DM) versus selected intensity measure (IM). The statistical treatment of the obtained multi-IEA curves is performed to summarize the results in a predictive mode. Finally, the fragility curves as damage probability indicators of shells in UNDEX loading are extracted. Results show that the IEA is a promising method for performance-based assessment of cylindrical shells subjected to UNDEX loading.

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Experimental and Numerical Investigations on Deformation of Cylindrical Shell Panels to Underwater Explosion

Cited by 19 publications

References 18 publications

Mitigation of Blast Induced Acceleration using open cell natural rubber and Synthetic Foam

Mitigation of Blast Induced Acceleration using open cell natural rubber and Synthetic Foam

Response of Dome-enclosed Box-type Structure to Underwater Explosion

Incremental Explosive Analysis and Its Application to Performance-Based Assessment of Stiffened and Unstiffened Cylindrical Shells Subjected to Underwater Explosion

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