Probabilistic damage modelling of textile-reinforced thermoplastic composites under high velocity impact based on combined acoustic emission and electromagnetic emission measurements

2014 ◽  
Vol 69 ◽  
pp. 1-10 ◽  
Author(s):  
G.O. Shchegel ◽  
R. Böhm ◽  
A. Hornig ◽  
V.V. Astanin ◽  
W.A. Hufenbach
Keyword(s):  
Acoustic Emission ◽  
High Velocity ◽  
Electromagnetic Emission ◽  
Thermoplastic Composites ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Damage Modelling

Validation of damage modelling in composite fuselage structures under high velocity impact

2013 ◽  
Vol 4 (3) ◽  
pp. 253-264 ◽  
Author(s):  
Alastair F. Johnson ◽  
Nathalie Toso-Pentecôte ◽  
Sebastian Kilchert
Keyword(s):  
High Velocity ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Damage Modelling

Long fiber thermoplastic composites under high-velocity impact: Study of fiber length

2018 ◽  
Vol 53 (3) ◽  
pp. 353-360 ◽  
Author(s):  
M Shayan Asenjan ◽  
Ali Reza Sabet ◽  
M Nekoomanesh
Keyword(s):  
High Velocity ◽  
Fiber Length ◽  
Thermoplastic Composites ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Impact Tests ◽  
Rate Of Increase ◽  
Long Fiber Thermoplastic ◽  
Internal Mixer ◽  
The Impact

This study experimentally investigates the high-velocity impact response of long glass fiber-reinforced polypropylenes with different fiber lengths. The study considers three long fiber thermoplastic composites, i.e. 5, 10, and 20 mm prepared via a combination of extrusion and pultrusion processes and a crosshead die. An internal mixer was used to obtain an isotropic compound. The dispersion quality of each compound was confirmed using burn off test. A gas gun with a spherical projectile was employed to conduct high-velocity impact tests at three velocities of 144, 205, and 240 m/s. Internal mixer operation resulted in extensive fiber length reduction for all three long fiber thermoplastic lengths. Results from mechanical tests (Tensile and Izod impact) revealed an increasing value with increase in long fiber thermoplastic length, i.e. fiber length. High-velocity impact results showed higher impact performance for 20 mm long fiber thermoplastic compound compared to 5 and 10 mm long fiber thermoplastic containing specimens. Rate of increase in energy absorption from neat polypropylene to 5 and 10 mm long fiber thermoplastic compounds is much higher than from 10 to 20 mm long fiber thermoplastics. High-velocity impact tests indicated that there may be a threshold value for fiber length beyond which the fiber length plays a lesser role. Scanning electron microscopic analysis showed more fiber breakage at the impact point at a higher impact velocity than the lower end of high-velocity impact.

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.

scholarly journals Analysis of High Velocity Impact on Hybrid Composite Fan Blades

1980 ◽  
Vol 17 (10) ◽  
pp. 763-766 ◽  
Author(s):  
C. C. Chamis ◽  
J. H. Sinclair
Keyword(s):  
Hybrid Composite ◽  
High Velocity ◽  
High Velocity Impact ◽  
Velocity Impact

Apparatus for investigating the effects of high-velocity impact on polymers

1972 ◽  
Vol 5 (5) ◽  
pp. 812-813
Author(s):  
V. V. Kovriga ◽  
V. N. Chalidze
Keyword(s):  
High Velocity ◽  
High Velocity Impact ◽  
Velocity Impact

Shape optimization of bumper beams under high-velocity impact loads

2015 ◽  
Vol 95 ◽  
pp. 49-60 ◽  
Author(s):  
Niyazi Tanlak ◽  
Fazil O. Sonmez ◽  
Mahmut Senaltun
Keyword(s):  
Shape Optimization ◽  
High Velocity ◽  
Impact Loads ◽  
High Velocity Impact ◽  
Velocity Impact

Crack Propagation and Local Failure Simulation of Reinforced Concrete Subjected to Projectile Impact Using RBSM

2016 ◽  
Author(s):  
Yoshihito Yamamoto ◽  
Soichiro Okazaki ◽  
Hikaru Nakamura ◽  
Masuhiro Beppu ◽  
Taiki Shibata
Keyword(s):  
Reinforced Concrete ◽  
Crack Propagation ◽  
High Velocity ◽  
Failure Modes ◽  
Concrete Structures ◽  
Constitutive Models ◽  
Local Failure ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Projectile Impact

In this paper, numerical simulations of reinforced mortar beams subjected to projectile impact are conducted by using the proposed 3-D Rigid-Body-Spring Model (RBSM) in order to investigate mechanisms of crack propagation and scabbing mode of concrete members under high-velocity impact. The RBSM is one of the discrete-type numerical methods, which represents a continuum material as an assemblage of rigid particle interconnected by springs. The RBSM have advantages in modeling localized and oriented phenomena, such as cracking, its propagation, frictional slip and so on, in concrete structures. The authors have already developed constitutive models for the 3D RBSM with random geometry generated Voronoi diagram in order to quantitatively evaluate the mechanical responses of concrete including softening and localization fractures, and have shown that the model can simulate cracking and various failure modes of reinforced concrete structures. In the target tests, projectile velocity is set 200m/s. The reinforced mortar beams with or without the shear reinforcing steel plates were used to investigate the effects of shear reinforcement on the crack propagation and the local failure modes. By comparing the numerical results with the test results, it is confirmed that the proposed model can reproduce well the crack propagation and the local failure behaviors. In addition, effects of the reinforcing plates on the stress wave and the crack propagation behaviors are discussed from the observation of the numerical simulation results. As a result, it was found that scabbing of reinforced mortar beams subjected to high velocity impact which is in the range of the tests is caused by mainly shear deformation of a beam.

The failed strength of ceramics subjected to high-velocity impact

2008 ◽  
Vol 104 (1) ◽  
pp. 013533 ◽  
Author(s):  
Timothy J. Holmquist ◽  
Gordon R. Johnson
Keyword(s):  
High Velocity ◽  
High Velocity Impact ◽  
Velocity Impact
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