Analysis of metallic cellular materials for blast mitigation
A mesoscale numerical model is developed to investigate the dynamic behavior of cellular materials under impacts and blast loads. A double-layer foam cladding is then proposed to fulfill different structural protection purposes. The energy absorption capacity of the double-layer foam cladding under...
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| Main Author: | |
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| Other Authors: | |
| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2008
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/12152 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | A mesoscale numerical model is developed to investigate the dynamic behavior of cellular materials under impacts and blast loads. A double-layer foam cladding is then proposed to fulfill different structural protection purposes. The energy absorption capacity of the double-layer foam cladding under blast load is analytically derived based on a rigid-perfectly plastic-locking material model. Good agreement is found between the analytical and numerical results. To consider the stiffness of the protected structure, an analytical Load-Cladding-Structure (LCS) model is further developed. Two non-dimensional parameters are introduced to describe the relations between the foam cladding and the protected structure. Knowing any two of the three components of the LCS model, the third one can be determined or predicted. Two structural models with sacrificial foam claddings are then simulated using LS-DYNA. The numerical results conform to the conclusion based on the LCS model that the foam cladding should be designed appropriately with reference to the potential blast load and the protected structure. |
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