Influences of thickness and stacking sequence on ballistic impact behaviors of GLARE 5 FML plates: Part I-experimental studies

2013 ◽  
Vol 48 (16) ◽  
pp. 2011-2021 ◽  
Author(s):  
A Seyed Yaghoubi ◽  
B Liaw
Keyword(s):  
Experimental Studies ◽  
Ballistic Impact ◽  
Stacking Sequence

scholarly journals Hybrid Composite Laminates Reinforced with Kevlar/Carbon/Glass Woven Fabrics for Ballistic Impact Testing

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Elias Randjbaran ◽  
Rizal Zahari ◽  
Nawal Aswan Abdul Jalil ◽  
Dayang Laila Abang Abdul Majid
Keyword(s):  
Energy Absorption ◽  
Hybrid Composite ◽  
Composite Laminates ◽  
Impact Resistance ◽  
Equal Mass ◽  
Woven Fabrics ◽  
Ballistic Impact ◽  
Impact Testing ◽  
Stacking Sequence ◽  
Ballistic Test

Current study reported a facile method to investigate the effects of stacking sequence layers of hybrid composite materials on ballistic energy absorption by running the ballistic test at the high velocity ballistic impact conditions. The velocity and absorbed energy were accordingly calculated as well. The specimens were fabricated from Kevlar, carbon, and glass woven fabrics and resin and were experimentally investigated under impact conditions. All the specimens possessed equal mass, shape, and density; nevertheless, the layers were ordered in different stacking sequence. After running the ballistic test at the same conditions, the final velocities of the cylindrical AISI 4340 Steel pellet showed how much energy was absorbed by the samples. The energy absorption of each sample through the ballistic impact was calculated; accordingly, the proper ballistic impact resistance materials could be found by conducting the test. This paper can be further studied in order to characterise the material properties for the different layers.

Experimental Studies for Burrs in Dry Drilling of Stacked Metal Materials

2010 ◽  
Vol 129-131 ◽  
pp. 959-963 ◽  
Author(s):  
Jie Liang ◽  
Shu Sheng Bi
Keyword(s):  
Titanium Alloy ◽  
Aluminium Alloy ◽  
Experimental Studies ◽  
Stacking Sequence ◽  
Assembly Quality ◽  
Burr Size ◽  
Dry Drilling ◽  
Clamp Force ◽  
Metal Materials ◽  
Cemented Carbide Drills

During the drilling of stacked materials, burrs forming on both the surface layer and the interlayer have some undesirable characters with regard to assembly quality, and deburring is a time-consuming and costly operation. This paper presented an experimental study on dry drilling of Ti-6Al-4V titanium alloy and 7075-T6 aluminium alloy stacked materials, which was performed by using uncoated cemented carbide drills. The burr size was evaluated at various spindle speeds, feed rates, stacking sequence and clamp force. Finally, the burr morphology was observed and analyzed. The best process parameters recorded in this paper were at the spindle speed of 2000r/min, the feed rate of 0.075mm/r, the pressure of 0.3MPa and the stacking sequence of the Ti-6Al-4V titanium alloy on top of the 7075-T6 aluminium alloy.

High velocity impact properties of composites reinforced by stitched and unstitched glass woven fabrics

2021 ◽  
pp. 152808372199986
Author(s):  
Zeynab Behroozi ◽  
Hooshang Nosraty ◽  
Majid Tehrani
Keyword(s):  
High Velocity ◽  
Woven Fabrics ◽  
Ballistic Impact ◽  
Woven Fabric ◽  
Impact Behavior ◽  
Stacking Sequence ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Damage Area ◽  
Properties Of Composites

The present research aimed to investigate the effect of stitching angle and stacking sequence of stitched layers on high velocity impact behavior of composites reinforced by glass woven fabrics. To study the effect of stitching angle on ballistic impact behavior, six different angles of (0°), (90°), (45°), (0°,90°), (±45°) and (0°,90°,±45°) were chosen as stitching angles. These stitching angles were applied on eight layers of glass woven fabric. To study the effect of stacking sequence of stitched layers, a different number of layers were stitched together with the angle of 0°. Unstitched and stitched composites were exposed to high velocity impact with 180 m/s using a spherical projectile. The residual velocity of projectile and dimensions of damage area on the composites’ front and back sides were measured. It was found that the sample with the 45° stitching angle had the best behavior against ballistic impact and its energy absorption was significantly higher than the other samples. Stitching also reduces damage area in front and back sides of the composites and inhibits delamination.

Ballistic impact performance of spaced multilayered and monolithic composite targets: Analytical and experimental studies

2017 ◽  
Vol 27 (9) ◽  
pp. 1352-1379 ◽  
Author(s):  
PS Patil ◽  
NK Naik
Keyword(s):  
Energy Absorption ◽  
Experimental Studies ◽  
Target Thickness ◽  
Ballistic Impact ◽  
Ballistic Limit ◽  
Composite Target ◽  
Impact Performance ◽  
Limit Velocity ◽  
Ballistic Limit Velocity ◽  
Energy Dissipated

Ballistic impact performance of spaced multilayered and monolithic composite targets is presented based on propagation of stress wave and energy balance within the target and the impacting projectile. The energy dissipated by the impacting projectile gets absorbed by the composite target through several energy absorbing mechanisms. Specifically, studies are performed on spaced bilayered target separated by air gap and monolithic target having the same total thickness. Energy absorption due to several mechanisms, contact force, projectile velocity, projectile tip displacement, and kinetic energy of the projectile with respect to time are presented. Also, ballistic limit velocity (VBL) and total energy absorption of the target with respect to target thickness have been evaluated. Spaced bilayered composite targets have higher ballistic limit velocity compared to monolithic composite targets from total target thickness of 16–28 mm. Monolithic composite targets have higher ballistic limit velocity compared to spaced bilayered composite targets up to total target thickness of 16 mm and beyond target thickness of 28 mm. Experimental studies were performed for the validation of analytical results. The analytically predicted value of ballistic limit velocity matches well with the experimental value.

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