Resistant performance of perforation in protective structures using a semi-empirical method with marine applications
✍ Scribed by C.-C. Liang; C.-Y. Jen; M.-F. Yang; P.-W. Wu
- Book ID
- 104159022
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 225 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0029-8018
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✦ Synopsis
To predict the performance of protective structures, in a preliminary design for weapons effects analysis processes considering the ship vulnerability evaluation, it is important to choose a method which is simple, quick and feasible. This paper presents a semi-empirical method to study the resistant performance of perforation in protective structures for fragment effects, such as residual velocity after penetration of structures between source of explosion and the target. In the calculation procedure, the mass distribution of fragments is obtained by expressing Mott's equation, the initial and striking velocities are calculated using Gurney's formulas and the residual velocity is estimated using Baker et al.'s equation. Using experimental results from the literature, Woodward's test data (1978) and Edwards and Mathewson's experimental data (1997) are employed to verify the ballistic limit velocity, and Rupert et al's test data (1997), Sorensen et al's test data (1999) and Yarin et al's test data (2000) are adopted to check the residual velocity. An example of a 500-ton patrol-boat's hull and bulkhead is also discussed. The results of the verification are good in terms of agreement, and impact velocities of this study varies from 1500 m/s to 2000 m/s, the ratio of L/ D ranges from 6 to 10 and the ratio (h / D) varies from 2.0 to 11.0, may serve as a useful reference for designers.