High-velocity impact damage in CFRP laminates

2016 ◽  
pp. 169-191 ◽  
Author(s):  
S. Yashiro ◽  
K. Ogi
Keyword(s):  
High Velocity ◽  
Impact Damage ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Cfrp Laminates

scholarly journals Damage of Hygrothermally Conditioned Carbon Epoxy Composites under High-Velocity Impact

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2525 ◽  
Author(s):  
Xiang Liu ◽  
Weimin Gu ◽  
Qiwen Liu ◽  
Xin Lai ◽  
Lisheng Liu
Keyword(s):  
High Velocity ◽  
Impact Test ◽  
Impact Damage ◽  
Fiber Reinforced Polymer ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Cfrp Laminates ◽  
Reinforced Polymer ◽  
Digital Microscope ◽  
The Impact

The influence of hygrothermal aging on high-velocity impact damage of carbon fiber-reinforced polymer (CFRP) laminates is investigated. Composite laminate specimens were preconditioned in water at 70 °C. The laminates were subsequently impacted by flat-, sphere-, and cone- ended projectiles with velocities of 45, 68, and 86 m/s. The incident and residual velocities were collected during the impact test. The impact-induced damages were measured by ultrasonic C-scan, a digital microscope system, and a scanning electron microscope. The results show that the hygrothermally conditioned laminates offer a higher energy absorption during high-velocity impact. Due to the weakening of the interlaminar properties, the hygrothermally conditioned laminates are more susceptible to delamination failure, and shear-induced debonding dominates. The projected delamination area increases with the increment of impact velocity. The damaged region becomes close to a circular shape after hydrothermal conditioning, and close to a rhomboidal shape for the dry specimens.

Effect of strain rate, off-axis loading and high-velocity impact damage on the compressive strength of C/SiC composite

2018 ◽  
Vol 53 (4) ◽  
pp. 535-546 ◽  
Author(s):  
M Altaf ◽  
S Singh ◽  
VV Bhanu Prasad ◽  
Manish Patel
Keyword(s):  
Compressive Strength ◽  
Strain Rate ◽  
High Velocity ◽  
Impact Damage ◽  
The Other ◽  
High Velocity Impact ◽  
Fibre Bundles ◽  
Velocity Impact ◽  
Kink Bands ◽  
Other Hand

The compressive strength of C/SiC composite at different strain rates, off-axis orientations and after high-velocity impact was studied. The compressive strength was found to be 137 ± 23, 130 ± 46 and 162 ± 33 MPa at a strain rate of 3.3 × 10−5, 3.3 × 10−3, 3.3 × 10−3 s−1, respectively. On the other hand, the compressive strength was found to be 130 ± 46, 99 ± 23 and 87 ± 9 MPa for 0°/90°, 30°/60° and 45°/45° fibre orientations to loading direction, respectively. After high-velocity impact, the residual compressive strength of C/SiC composite was found to be 58 ± 26, 44 ± 18 and 36 ± 3.5 MPa after impact with 100, 150 and 190 m/s, respectively. The formation of kink bands in fibre bundles was found to be dominant micro-mechanism for compressive failure of C/SiC composite for 0°/90° orientation. On the other hand, delamination and the fibre bundles rotation were found to be the dominant mechanism for off-axis failure of composite.

High Velocity Impact Behaviour of Hybrid-Fiber Engineered Cementitious Composite Panels

2012 ◽  
Vol 450-451 ◽  
pp. 563-567 ◽  
Author(s):  
Joel Bell ◽  
Yi Xia Zhang ◽  
Khin Soe ◽  
Phillip Hermes
Keyword(s):  
High Velocity ◽  
Impact Damage ◽  
Impact Resistance ◽  
High Velocity Impact ◽  
Cementitious Composite ◽  
Protective Material ◽  
Velocity Impact ◽  
Impact Behaviour ◽  
Engineered Cementitious Composite ◽  
Hybrid Fibre

High-velocity impact behaviour of hybrid-fibre engineered cementitious composite (ECC) panels subjected to an impact from a hardened steel, ogive-nosed projectile at velocities between 300-700 m/s is investigated and reported in this paper. The new ECC mix contains a proportion of 0.75% volume high-modulus steel fibres and 1.25% volume low modulus polyvinyl-alcohol (PVA) fibres. The mix is designed to achieve a desired balance between the strain hardening behaviour and impact resistance of material required for impact and blast resistant structures. The new hybrid-fibre ECC demonstrates its excellent capability for impact resistance and strong potential as a protective material with reduced impact damage and distributed micro cracking.

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