Influence of Triggers on the Damage Characteristics and Initial Peak Load of Composite Tubular Energy Absorbers for Low-Velocity Impact Applications

2020 ◽  
pp. 43-53
Author(s):  
Venkateswarlu Gattineni ◽  
Venukumar Nathi
Keyword(s):  
Peak Load ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Velocity Impact ◽  
Damage Characteristics ◽  
Energy Absorbers ◽  
Initial Peak

Studies on the Low-Velocity Impact Response of Ultra-High Molecular Weight Polyethylene Laminated Composites

2011 ◽  
Vol 332-334 ◽  
pp. 1691-1694
Author(s):  
Dian Tang Zhang ◽  
Bao Dong Li ◽  
Ying Sun ◽  
Ning Pan
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Impact Energy ◽  
Laminated Composites ◽  
Peak Load ◽  
Impact Response ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Velocity Impact ◽  
Ultra High Molecular Weight

The low-velocity impact response of Ultra-High Molecular Weight Polyethylene (UHMWPE) laminated composites were studied by drop-weight experiments. Laminated composites were fabricated with unidirectional UHMWPE prepreg using hot-pressing process. Laminated composites of size 150mm×100mm were subjected to low-velocity impact loading at three energy levels of 15J, 25J and 35J. It is found that the slops of load-time and energy-time curves increase with increase in the impact energy. However, load-time curve shows that there are some fluctuations before the peak load was reached. Peak load and absorbed energy increase with increasing impact energy. However, time to peak load decreases linearly with increasing impact energy.

Low velocity impact damage characteristics of Z-fiber reinforced sandwich plates - An experimental study

1997 ◽  
Author(s):  
A. Palazotto ◽  
L. Gummadi ◽  
U. Vaidya ◽  
E. Herup ◽  
A. Palazotto ◽  
...  
Keyword(s):  
Experimental Study ◽  
Impact Damage ◽  
Low Velocity Impact ◽  
Sandwich Plates ◽  
Fiber Reinforced ◽  
Low Velocity ◽  
Velocity Impact ◽  
Damage Characteristics

The Efficiency of Auxetic Cores in Sandwich Beams Subjected to Low-Velocity Impact

2020 ◽  
Vol 12 (06) ◽  
pp. 2050061
Author(s):  
Mohammad Hedayatian ◽  
A. R. Daneshmehr ◽  
G. H. Liaghat
Keyword(s):  
Impact Energy ◽  
Test Procedure ◽  
Peak Load ◽  
Sandwich Beam ◽  
Low Velocity Impact ◽  
Sandwich Beams ◽  
Low Velocity ◽  
Velocity Impact ◽  
Unit Cells ◽  
Impact Area

This paper experimentally investigates the behavior of sandwich beam with auxetic core subjected to low-velocity impact loading. Two types of sandwich beams with different topologies of auxetic cellular cores were produced. Furthermore, a test procedure involving a cylindrical impactor was developed, and a parametric study was designed and performed. The results revealed that, at the same level of impact energy, the peak load decreased by increasing the re-entrant angle would make the auxetic sample with the highest re-entrant angle an ideal candidate for protective applications. However, in other applications where the structure needs to be protected from damage at a higher level of impact energy, the auxetic sample with the lowest re-entrant angle exhibited the best performance due to the highest amount of failure energy. Finally, the results showed that once the core structure changed from the conventional to auxetic, the energy level leading to damage to the structure increased so that it was escalated by a factor of 2 in the auxetic sample compared to the conventional sample. This is due to the negative Poisson’s ratio effect of structure that makes unit cells be drawn into the projectile impact area and, in turn, the structure is strengthened.

Influence of Incident Energy on Sisal/Epoxy Composite Subjected to Low Velocity Impact and Damage Characterization Using Ultrasonic C-Scan

2021 ◽  
Author(s):  
Saravanan Mahesh ◽  
Muthukumar Chandrasekar ◽  
R. Asokan ◽  
Yaddula Chandra Mouli ◽  
Katta Sridhar ◽  
...  
Keyword(s):  
Incident Energy ◽  
Epoxy Composite ◽  
Energy Levels ◽  
Epoxy Composites ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Sisal Fibre ◽  
Velocity Impact ◽  
Damage Characteristics ◽  
Structural Applications

Impact resistance is an inevitable characteristic of the composites employed in the high performance structural applications. Due to the growing interest in the use of sisal fibre as reinforcement in the polymer composites, it is required to determine the response of sisal/epoxy composites to low velocity impact at high incident energies where perforation can occur and assess the damage characteristics using a non-destructive technique. In this work, sisal/epoxy composites were subjected to drop weight impact in the velocity range of 3 m/s to 5 m/s at different energy levels between 20 J to 50 J according to the ASTM D7136. Based on the results observed, it is concluded that both the peak load and absorbed energy increased with the increasing incident energy level up to 40 J. At 50 J, perforation occurred and the maximum deformation was approximately 22 mm for the sisal/ epoxy composite. Damage characteristics and failure behaviour of the composite at different incident energies was examined from the visual images of the front and back face of the composite. The quantitative assessment of crack propagation in the sisal/epoxy composite and the damage area were determined from the ultrasonic C-scan images of the sample post impact at various energy levels.

Damage characteristics in laminated composite structures subjected to low-velocity impact

2019 ◽  
Vol 11 (5) ◽  
pp. 670-685 ◽  
Author(s):  
Konstantinos Stamoulis ◽  
Stelios K. Georgantzinos ◽  
G.I. Giannopoulos
Keyword(s):  
Numerical Modeling ◽  
Impact Damage ◽  
Laminated Composites ◽  
Time Response ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Content Type ◽  
Velocity Impact ◽  
Damage Characteristics ◽  
Force Time

Purpose The present study deals with the numerical modeling of the low-velocity impact damage of laminated composites which have increasingly important applications in aerospace primary structures. Such damage, generated by various sources during ground handling, substantially reduces the mechanical residual performance and the safe-service life. The purpose of this paper is to present and validate a computationally efficient approach in order to explore the effect of critical parameters on the impact damage characteristics. Design/methodology/approach Numerical modeling is considered as one of the most efficient tool as compared to the expensive and time-consuming experimental testing. In this paper, a finite element model based on explicit dynamics formulations is adopted. Hashin criterion is applied to predict the intralaminar damage initiation and evolution. The numerical analysis is performed using the ABAQUS® programme. Findings The employed modeling approach is validated using corresponding numerical data found in the literature and the presented results show a reasonable correlation to the available literature data. It is demonstrated that the current model can be used to capture the force-time response as well as damage parameter maps showing the intralaminar damage evolution for different impact cases with respect to the physical boundary conditions and a range of impact energies. Originality/value Low-velocity impact damage of laminated composites is still not well understood due to the complexity and non-linearity of the damage zone. The presented model is used to predict the force-time response which is considered as one of the most important parameters influencing the structural integrity. Furthermore, it is used for capturing the damage shape evolution, exhibiting a high degree of capability as a damage assessment computational tool.

Recovery of Low-Velocity Impact Properties of Glass Fiber Reinforced Composites Through Self-Healing Technique

2013 ◽  
Author(s):  
Shaik Zainuddin ◽  
Arefin Tauhid ◽  
Mahesh V. Hosur ◽  
Shaik Jeelani ◽  
Ashok Kumar
Keyword(s):  
Glass Fibers ◽  
Energy Levels ◽  
Peak Load ◽  
Low Velocity Impact ◽  
Self Healing ◽  
Low Velocity ◽  
Impact Properties ◽  
Velocity Impact ◽  
Significant Recovery ◽  
Control Samples

In this study, we report the self-healing of e-glass/epoxy composites achieved through embedding self-healing agents (SHA) filled hollow glass fibers (HGFs). At first, catalytic technique was used to fill bonded HGFs with SHA. The HGFs were then laid on e-glass fibers and the laminates were fabricated using vacuum assisted resin molding (VARIM) technique. Low-velocity impact tests at two different energy levels were conducted multiple times in the closest proximity to determine the healing efficiency. Optical microscopic study was done to see the changes in the SHA filled HGFs samples before and after impact. Results showed significant recovery of impact properties with 4.47% lost in peak load after second impact in SHA samples whereas it was 27.7% in control samples. The loss in energy to peak load was 20.44% in SHA filled samples, whereas 41% in control samples. Optical microscopy images showed filling of cracks produced after impact with SHA reflecting the significant recovery of impact properties.

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