Influences of thickness and stacking sequence on ballistic impact behaviors of GLARE 5 FML plates: Part II – Numerical studies

2013 ◽  
Vol 48 (19) ◽  
pp. 2363-2374 ◽  
Author(s):  
A Seyed Yaghoubi ◽  
B Liaw
Keyword(s):  
Ballistic Impact ◽  
Stacking Sequence ◽  
Numerical Studies

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.

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.

SCALING LAW AND PHYSICAL SIMILITUDE FOR BUCKLING AND VIBRATION OF ANTISYMMETRIC ANGLE-PLY LAMINATED CYLINDRICAL SHELLS

2003 ◽  
Vol 03 (04) ◽  
pp. 567-583 ◽  
Author(s):  
VARIDDHI UNGBHAKORN ◽  
PAIROD SINGHATANADGID
Keyword(s):  
Scaling Laws ◽  
Cylindrical Shells ◽  
Scaling Law ◽  
Stacking Sequence ◽  
Buckling Loads ◽  
Fundamental Frequencies ◽  
Numerical Studies ◽  
Yield Values ◽  
Circular Cylindrical Shells ◽  
Similitude Theory

The similitude invariants and scaling laws for the buckling and free vibration of antisymmetric angle-ply laminated circular cylindrical shells were derived by directly applying the similitude transformation to the governing differential equations of the problem considered. The scaling laws relate the buckling load and natural frequency of a model to those of a prototype when the similarity requirements between the two systems are fulfilled. In the absence of experimental data, the validity of the scaling laws was verified by calculating theoretically the buckling loads and fundamental frequencies of vibration of the model and substituting them into the scaling laws to yield values for the prototype, which were then compared with those directly computed for the prototype. The numerical studies show that for the case of complete similitude with various stacking sequence, number of plies, and radius ratio, the solutions predicted by the similitude theory agree exactly with those obtained directly from the theory. Some typical partial similitude cases were also investigated. It was demonstrated that the partial similitude model with distortion in stacking sequence is reliable for predicting the behavior of the prototype. On the other hand, models with distortion in material properties are not recommended because of the existence of large discrepancies in the predicted results.

scholarly journals The Effects of Stacking Sequence Layers of Hybrid Composite Materials in Energy Absorption under the High Velocity Ballistic Impact Conditions – An Experimental Investigation

2014 ◽  
Vol 3 (3) ◽  
pp. 130
Author(s):  
Elias Randjbaran
Keyword(s):  
Composite Materials ◽  
Energy Absorption ◽  
Material Properties ◽  
Hybrid Composite ◽  
High Velocity ◽  
Impact Resistance ◽  
Equal Mass ◽  
Ballistic Impact ◽  
Stacking Sequence ◽  
Ballistic Test

In the current study, the effects of stacking sequence layers of hybrid composite materials on ballistic energy absorption, which were fabricated from Kevlar, carbon, glass fibres and resin have been experimentally investigated at the high velocity ballistic impact conditions. All the samples have equal mass, shape and density, but they have different stacking sequence layers. After running the ballistic test in the same conditions, the final velocities of the bullets showed that how much energy absorbed by the samples. The energy absorption of each sample through the ballistic impact has been calculated, accordingly , the decent ballistic impact resistance materials could be found by conducting the test. This paper can be further studied in order to characterise the material properties.

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