Parametric studies of numerical models of a reinforced concrete slab subjected to contact explosion of a rectangular explosive
碩士 === 國防大學中正理工學院 === 軍事工程研究所 === 94 === The objective of this study is to evaluate parameters for determining crater size of a reinforced concrete slab subjected to a rectangular explosive by using fluid-structure interaction algorithm in the LS-DYNA software. The Lagrangian mesh was used for rebar...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2006
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| Online Access: | http://ndltd.ncl.edu.tw/handle/08701316877139948744 |
| Summary: | 碩士 === 國防大學中正理工學院 === 軍事工程研究所 === 94 === The objective of this study is to evaluate parameters for determining crater size of a reinforced concrete slab subjected to a rectangular explosive by using fluid-structure interaction algorithm in the LS-DYNA software. The Lagrangian mesh was used for rebars and concrete, and the Eulerian mesh was used for explosive and air.
First, numerical models for free-air bursts and surface bursts were considered for validation of overpressure and impulse due to rectangular explosives by compared with experiential values from the Army TM5-1300. The 3000K temperature effect of elements contacted with explosive was considered. Results showed that the temperature can increase overpressure and impulse at scaled distance greater than 0.4m/Kg1/3 only.
Then, numerical models of a reinforced concrete slab subjected to contact explosion were considered for studying effect of erosion parameters on crater sizes. Maximum shear strain and principal strain were considered. Results showed that Increasing maximum shear strain can decrease average diameter of front size of slabs and increase average diameter of back side of slabs. But the effect of changing maximum principal strain on crater sizes has no rules.
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