Skip to Main Content
 

Global Search Box

 
 
 

ETD Abstract Container

Abstract Header

IMPACT AND POST IMPACT RESPONSE OF COMPOSITE SANDWICH STRUCTURES IN ARCTIC CONDITION

Mohammed, Mohammed Abdelaziz Elamin
http://rave.ohiolink.edu/etdc/view?acc_num=akron1518520473027006

Abstract Details

2018, Master of Science in Engineering, University of Akron, Mechanical Engineering.
This study investigates the impact response, compression after impact (CAI) response and damage mechanisms of composite sandwich structures in arctic con- dition. Carbon fiber reinforced composite sandwich panels with polyvinyl chloride (PVC) foam core are subjected to low-velocity impact tests, followed by compression tests at extreme low temperatures, representative of the harsh arctic environmental condition. Results from impact tests showed that the specimens impacted at extreme low temperature (-70 ¿C) exhibit less strength, and higher susceptibility to damage, resulting in severe penetration by the impactor. X-ray micro-computed tomography technique is employed to reveal multiple complex impact damage modes. Specifically, impact test results elucidate arctic temperature influence on detrimental failure mech- anisms: large facesheet-core debonding, extensive composite facesheet delamination, significant core shearing and crushing, and severe facesheet fiber fracture. The results from the CAI tests show that, the compressive strength and the retention factor of the impacted samples are significantly reduced in low-temperature environments. Re- sults also demonstrate that, the stiffness of the samples is increased with decreasing tests temperature. However, at -70 ¿C, the impacted structures experience severe and complex damages; which triggered a counter effect due to the expanded delamination area and therefore greatly reduce the stiffness. The results evidently show that, in arctic conditions, the residual strength of the naval structures is significantly reduced and the ultimate failure risk is higher. This work provides an important fundamental knowledge for future design of naval composite sandwich structures with enhanced impact performance at low temperature arctic condition.
Kwek-Tze Tan, Dr (Advisor)
Graham Kelly, Dr (Committee Member)
Xiaosheng Gao, Dr (Committee Member)
71 p.
Aerospace Materials; Mechanical Engineering; Mechanics

Recommended Citations

Citations

  • Mohammed, M. A. E. (2018). IMPACT AND POST IMPACT RESPONSE OF COMPOSITE SANDWICH STRUCTURES IN ARCTIC CONDITION [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1518520473027006

    APA Style (7th edition)

  • Mohammed, Mohammed. IMPACT AND POST IMPACT RESPONSE OF COMPOSITE SANDWICH STRUCTURES IN ARCTIC CONDITION . 2018. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1518520473027006.

    MLA Style (8th edition)

  • Mohammed, Mohammed. "IMPACT AND POST IMPACT RESPONSE OF COMPOSITE SANDWICH STRUCTURES IN ARCTIC CONDITION ." Master's thesis, University of Akron, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1518520473027006

    Chicago Manual of Style (17th edition)

akron1518520473027006
26
© 2018, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.