The Influence of Cowper-Symonds Coefficients on the Response of Stiffened Steel Plates Subjected to Close-In Blast Loads
The Cowper-Symonds relationship is the most common empirical equation used to model the influence of strain rates in steel structures subjected to blast loads. The simplicity of this relationship makes it as the preferred choice due to the minimum number of coefficients used in the equation. However...
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| Format: | Conference or Workshop Item |
| Language: | English English |
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Trans Tech Publications, Switzerland
2022
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| Online Access: | http://umpir.ump.edu.my/id/eprint/41832/1/The%20Influence%20of%20Cowper-Symonds%20Coefficients%20on%20The%20Response%20of%20Stiffened%20Steel%20Plates.pdf http://umpir.ump.edu.my/id/eprint/41832/2/The%20Influence%20of%20Cowper-Symonds%20Coefficients%20on%20The%20Response%20of%20Stiffened%20Steel%20Plates%20Subjected%20to%20Close-In%20Blast%20Loads.pdf |
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| author | Nurul Syafiqah, Abdul Razak Aizat, Alias Nor Maslina, Mohsan Siti Aliyyah, Masjuki |
| author_facet | Nurul Syafiqah, Abdul Razak Aizat, Alias Nor Maslina, Mohsan Siti Aliyyah, Masjuki |
| author_sort | Nurul Syafiqah, Abdul Razak |
| collection | UMP |
| description | The Cowper-Symonds relationship is the most common empirical equation used to model the influence of strain rates in steel structures subjected to blast loads. The simplicity of this relationship makes it as the preferred choice due to the minimum number of coefficients used in the equation. However, different coefficients were reported from experimental results where it was found that the coefficients could be influenced by the thickness of the specimens, types of materials and method of testing. Even so, the actual coefficients even for the same type of material such as for mild steel could be differ. It is known that strain rates effect increases the yield strength of steel, and this could reduce the maximum displacement of steel structures such as steel plates subjected to blast loads. This influence could be more significant if the steel plate was stiffened. Therefore, this study investigated the influence of Cowper-Symonds coefficients for steel plates with stiffeners subjected to close-in blast loads. The numerical investigations were performed using finite element software, Abaqus. The target plate was a 0.4 m x 0.4 m plate with 0.002 m of thickness subjected to a 0.012 kg of Plastic Explosive No. 4 (PE4) at 0.04 m stand-off distance. The influenced of stiffeners were investigate first where five stiffeners’ configurations were used and, in each configuration, the stiffeners come with different geometry ratios. Two best stiffened steel plates have been chosen to study the influence of different Cowper-Symonds coefficients. Different coefficient values of dominator, D and hardening coefficients, q was used. The results shows that any possible coefficient combinations of Cowper-Symonds relation are possible to use in predicting response of steel plates subjected to blast loads. From this study, the most ideal stiffened square steel plates for offshore platform could be identified. |
| first_indexed | 2024-09-25T03:51:10Z |
| format | Conference or Workshop Item |
| id | UMPir41832 |
| institution | Universiti Malaysia Pahang |
| language | English English |
| last_indexed | 2024-09-25T03:51:10Z |
| publishDate | 2022 |
| publisher | Trans Tech Publications, Switzerland |
| record_format | dspace |
| spelling | UMPir418322024-07-09T09:11:53Z http://umpir.ump.edu.my/id/eprint/41832/ The Influence of Cowper-Symonds Coefficients on the Response of Stiffened Steel Plates Subjected to Close-In Blast Loads Nurul Syafiqah, Abdul Razak Aizat, Alias Nor Maslina, Mohsan Siti Aliyyah, Masjuki T Technology (General) TA Engineering (General). Civil engineering (General) The Cowper-Symonds relationship is the most common empirical equation used to model the influence of strain rates in steel structures subjected to blast loads. The simplicity of this relationship makes it as the preferred choice due to the minimum number of coefficients used in the equation. However, different coefficients were reported from experimental results where it was found that the coefficients could be influenced by the thickness of the specimens, types of materials and method of testing. Even so, the actual coefficients even for the same type of material such as for mild steel could be differ. It is known that strain rates effect increases the yield strength of steel, and this could reduce the maximum displacement of steel structures such as steel plates subjected to blast loads. This influence could be more significant if the steel plate was stiffened. Therefore, this study investigated the influence of Cowper-Symonds coefficients for steel plates with stiffeners subjected to close-in blast loads. The numerical investigations were performed using finite element software, Abaqus. The target plate was a 0.4 m x 0.4 m plate with 0.002 m of thickness subjected to a 0.012 kg of Plastic Explosive No. 4 (PE4) at 0.04 m stand-off distance. The influenced of stiffeners were investigate first where five stiffeners’ configurations were used and, in each configuration, the stiffeners come with different geometry ratios. Two best stiffened steel plates have been chosen to study the influence of different Cowper-Symonds coefficients. Different coefficient values of dominator, D and hardening coefficients, q was used. The results shows that any possible coefficient combinations of Cowper-Symonds relation are possible to use in predicting response of steel plates subjected to blast loads. From this study, the most ideal stiffened square steel plates for offshore platform could be identified. Trans Tech Publications, Switzerland 2022 Conference or Workshop Item PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/41832/1/The%20Influence%20of%20Cowper-Symonds%20Coefficients%20on%20The%20Response%20of%20Stiffened%20Steel%20Plates.pdf pdf en http://umpir.ump.edu.my/id/eprint/41832/2/The%20Influence%20of%20Cowper-Symonds%20Coefficients%20on%20The%20Response%20of%20Stiffened%20Steel%20Plates%20Subjected%20to%20Close-In%20Blast%20Loads.pdf Nurul Syafiqah, Abdul Razak and Aizat, Alias and Nor Maslina, Mohsan and Siti Aliyyah, Masjuki (2022) The Influence of Cowper-Symonds Coefficients on the Response of Stiffened Steel Plates Subjected to Close-In Blast Loads. In: Key Engineering Materials. World Sustainable Construction Conference Series 2021 , 15–16 October 2021 , Kuantan, Pahang, Malaysia. pp. 171-184., 912 (274579). ISSN 1662-9795 (Published) https://doi.org/10.4028/p-ha2dxu |
| spellingShingle | T Technology (General) TA Engineering (General). Civil engineering (General) Nurul Syafiqah, Abdul Razak Aizat, Alias Nor Maslina, Mohsan Siti Aliyyah, Masjuki The Influence of Cowper-Symonds Coefficients on the Response of Stiffened Steel Plates Subjected to Close-In Blast Loads |
| title | The Influence of Cowper-Symonds Coefficients on the Response of Stiffened Steel Plates Subjected to Close-In Blast Loads |
| title_full | The Influence of Cowper-Symonds Coefficients on the Response of Stiffened Steel Plates Subjected to Close-In Blast Loads |
| title_fullStr | The Influence of Cowper-Symonds Coefficients on the Response of Stiffened Steel Plates Subjected to Close-In Blast Loads |
| title_full_unstemmed | The Influence of Cowper-Symonds Coefficients on the Response of Stiffened Steel Plates Subjected to Close-In Blast Loads |
| title_short | The Influence of Cowper-Symonds Coefficients on the Response of Stiffened Steel Plates Subjected to Close-In Blast Loads |
| title_sort | influence of cowper symonds coefficients on the response of stiffened steel plates subjected to close in blast loads |
| topic | T Technology (General) TA Engineering (General). Civil engineering (General) |
| url | http://umpir.ump.edu.my/id/eprint/41832/1/The%20Influence%20of%20Cowper-Symonds%20Coefficients%20on%20The%20Response%20of%20Stiffened%20Steel%20Plates.pdf http://umpir.ump.edu.my/id/eprint/41832/2/The%20Influence%20of%20Cowper-Symonds%20Coefficients%20on%20The%20Response%20of%20Stiffened%20Steel%20Plates%20Subjected%20to%20Close-In%20Blast%20Loads.pdf |
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