Journal
APPLIED SCIENCES-BASEL
Volume 11, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/app11083466
Keywords
impact load; triaxial braided composites; casing containment; damage failure; environmental temperature
Categories
Funding
- National Natural Science Foundation of China [51975279, 51605218]
- National Science and Technology Major Project [2017-IV0006-0043]
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This study investigated the impact of three different projectiles on triaxial braided composite panels, finding that soft gelatin projectile absorbs more energy while CFRP projectile leads to shear fracture damage pattern. The environmental temperature was found to influence the damage pattern and energy absorption behavior of triaxial braided composites.
Two-dimensional (2D) triaxial braided composites with braiding angle (+/- 60 degrees/0 degrees) have been used as aero-engine containing casing material. In the current paper, three types of projectile with the same mass and equivalent diameter, including cylinder gelatin projectile, carbon fiber-reinforced plastics (CFRP), and titanium alloy blade-like projectile, were employed to impact on triaxial braided composites panels with thickness of 4.3 mm at room temperature (20 degrees C) to figure out the influences of projectile materials on the damage pattern and energy absorption behavior. Furthermore, the influences of environmental temperature were also discussed considering the aviation service condition by conducting ballistic impact tests using CFRP projectile at cryogenic temperature (-50 degrees C) and high temperature (150 degrees C). The triaxial braided target panel were pre-heated or cooled in a low-temperature chamber before mounted. It is found that soft gelatin project mainly causes global deformation of the target and therefore absorb much more energy. The triaxial braided composite absorb 77.59% more energy when impacted with CFRP projectile than that with titanium alloy projectile, which mainly results in shear fracture. The environmental temperature has influences on the damage pattern and energy absorption of triaxial braided composites. The cryogenic temperature deteriorates the impact resistance of the triaxial braided composite material with matrix cracking damage pattern, while high temperature condition improves its impact resistance with shearing fracture damage pattern.
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