Optimization of process parameters for ballistic impact response of hybrid sandwich composites

Kumar, T. Satish; Joladarashi, Sharnappa; Kulkarni, S. M.; Doddamani, Saleemsab

doi:10.1007/s12008-022-01061-2

Cited by 10 publications

(8 citation statements)

References 36 publications

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“…A hemispherical shape impactor was selected because it is a common type of impactor used in LVI testing of sandwich composites. From the studies, it is observed that conical shaped impactor absorbs maximum energy with lesser damage, and flat type impactor absorbs lesser energy with localized failure and maximum damage 66 . The hemispherical shape provides a balance between energy absorption and damage.…”

Section: Methodsmentioning

confidence: 99%

“…Based on the reported studies, the algorithm of penalty contact was employed to determine the interaction that exists between the impactor and the skin (top surface). The automated surface‐to‐surface contact method was utilized to establish the possible interaction among any two sandwich components, and a friction coefficient of 0.3 was taken, which may happen because of hard contact and pressure, and the general contact method was used to measure the interaction between the laminates 66 …”

Section: Methodsmentioning

confidence: 99%

“…From the studies, it is observed that conical shaped impactor absorbs maximum energy with lesser damage, and flat type impactor absorbs lesser energy with localized failure and maximum damage. 66 The hemispherical shape provides a balance between energy absorption and damage. The skin and core materials are modeled into a 3D deformable body in the proper sequence, as shown in Figure 1.…”

Section: Fe Modelingmentioning

confidence: 99%

“…The automated surface-to-surface contact method was utilized to establish the possible interaction among any two sandwich components, and a friction coefficient of 0.3 was taken, which may happen because of hard contact and pressure, and the general contact method was used to measure the interaction between the laminates. 66…”

Section: Fe Modelingmentioning

confidence: 99%

See 3 more Smart Citations

Experimental and numerical investigation on low‐velocity impact response of sandwich structure with functionally graded core

T. S.,

Joladarashi,

Kulkarni

et al. 2023

Polymer Composites

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The present research investigates optimizing the impact resistance of functionally graded sandwich structures using experimental and numerical approaches. The low‐velocity impact (LVI) responses of functionally graded sandwich composite (FGSC) with different configurations with skin material jute/rubber/jute (JRJ) and core material having epoxy and sea sand by volume fraction of sea sand at 0%, 10%, 20%, and 30%. Sandwich structures were impacted with LVI (5.89, 10.92, and 15.18 m/s), with the impactor dropped from heights of 0.5, 1, and 1.5 m with precompressed spring loads. FGSC samples are considered a deformable body, and the impactor is modeled as a rigid body using commercially accessible dynamic explicit software. The burn‐out test and weight method were used to test the core's gradience; both methods' results substantially matched, and the variance in gradation could be observed. The proposed sandwich structure characteristics are examined by energy absorption, peak force, energy loss percentage, and coefficient of restitution. Results showed that SC30S provides greater energy absorption and superior damage resistance when tested on LVI. To evaluate the accuracy of experimental findings in predicting the indentation behavior of the sandwich structure, the finite element analysis was used to compare with the experimental results. According to the examination of these proposed FGSC overall performance, they could potentially be employed as sacrificial materials for LVI applications like claddings to shield major structural components. The systematic approach used in this work serves as a standard for choosing and using FGSC effectively for LVI applications.Highlights Low‐velocity impact behavior of sandwich structures was investigated. Combining flexible skin and epoxy core enhances energy absorption. Based on impact energy levels, impact damage areas were determined. Examined sandwich structure advantages in structural and aerospace uses. In terms of time and cost, the numerical analysis method would be useful.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Fe Modelingmentioning

confidence: 99%

Section: Fe Modelingmentioning

confidence: 99%

See 2 more Smart Citations

Experimental and numerical investigation on low‐velocity impact response of sandwich structure with functionally graded core

T. S.,

Joladarashi,

Kulkarni

et al. 2023

Polymer Composites

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“…In order for the projectile to have a good lateral effect, the projectile is usually designed as a flat-head structure. Kumar et al [ 15 ] found that a flat-tipped projectile can cause greater damage. However, compared to the pointed projectile, the flat-tipped projectile has a weaker penetration capability.…”

Section: Introductionmentioning

confidence: 99%

Research on the Penetration Characteristics of PELE Projectile with Reactive Inner Core

et al. 2023

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With the improvement of protection technology, the damage power of conventional penetrators has become increasingly inferior. Reactive material is a new type of energetic material, which has strong energy release capabilities under high-velocity-impact conditions. In this paper, the reactive materials were put into the penetrator, and its penetration characteristics were studied. First, the penetrator with enhanced lateral effect (PELE) projectile structure with better penetration capability was obtained by numerical simulation. Then, based on the established polytetrafluoroethylene (PTFE)/Al reactive material reaction model, the numerical simulation and experimental research of the PELE projectile with a reactive inner core penetrating the target were carried out. The results show that the simulation results are in good agreement with the experimental results, which verifies the confidence of the numerical simulation. The PELE projectile had a significant increase in power with the use of a truncated conical head and reactive materials. The residual velocity of the truncated cone PELE projectile increases by 8.41%-21% over conventional PELE projectiles. Its damage range is 43% higher than that of conventional penetrators. The simulation method and the conclusions obtained in this paper can provide support and reference for further research on reactive materials and on effectively improving the damage power of the penetrator.

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Experimental and numerical investigation on the elastic properties of luffa–cenosphere‐reinforced epoxy hybrid composite

Gurjar,

Kulkarni,

Joladarashi

et al. 2024

Polymer Composites

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Estimating the elastic characteristics of natural fiber‐reinforced polymer composites such as luffa fiber reinforced with epoxy is challenging. The structure of luffa cylindrica is complex, like a three‐dimensional natural fibrous mat, netting‐like structure. The multiscale modeling of such structures is the challenge to be addressed. The prime objective of this work is to determine the specific elastic properties of luffa–cenosphere‐reinforced epoxy (LCE) composite, considering the effect of filler volume fractions. Furthermore, multiscale modeling techniques, such as representative volume elements (RVEs) of finite element techniques with chopped, unidirectional, plain, and twill weaving fiber arrangements, were employed. The longitudinal modulus, transverse modulus, shear modulus, and Poisson's ratio were predicted through these modeling approaches. However, experimental and analytical methodologies, including the rule of mixture and Halpin–Tsai, were considered to validate the finite element analysis results. The elastic characteristics of LCE composite were therefore shown to be enhanced by increasing filler volume fraction. However, the cenosphere's 20% volume fraction has the highest elastic properties as determined by analytical, experimental, and computational models. Analytical and finite element simulation results were compared with the experimental results, and based on the findings, the most suitable (unidirectional, chopped, plain, and twill weaving) RVE was identified for finite element modeling of LCE composite for the evaluation of elastic properties. Results from practical approaches and the RVE twill weaving model showed good agreement, with less than 1% error, compared to the other analytical and finite element methods.Highlights NFCs are gaining ground in polymer composites. Overcoming challenges in modeling of luffa fiber inside epoxy matrix. The study uses multiscale modeling with diverse fiber arrangements. Experimental and analytical methods used to confirm FEA results. Increased cenosphere volume fraction boosts LCE composite properties.

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Optimization of process parameters for ballistic impact response of hybrid sandwich composites

Cited by 10 publications

References 36 publications

Experimental and numerical investigation on low‐velocity impact response of sandwich structure with functionally graded core

Experimental and numerical investigation on low‐velocity impact response of sandwich structure with functionally graded core

Research on the Penetration Characteristics of PELE Projectile with Reactive Inner Core

Experimental and numerical investigation on the elastic properties of luffa–cenosphere‐reinforced epoxy hybrid composite

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