PowerPoint Presentation

[Audio] DEVELOPMENT OF SANDWICH COMPOSITES USING LUFFA FIBER FOR BALLISTIC APPLICATION Research by Ashish Kumar Gurjar 2170138ME005 Research Supervisor (s) Dr. S M Kulkarni and Dr. Sharnappa J Department of Mechanical Engineering National Institute of Technology Karnataka, Surathkal 31-05-2026 Dept. of Mechanical Engg. NITK, Surathkal.

[Audio] Introduction PROBLEM Challenges to using sandbags as protection Sandbags are heavy Bag material is costly High Transportation cost of sand Scarcity of sand Construction of a bunker is difficult and time-consuming. Sand leaking after perforation.

[Audio] Solution It is required to develop a new structural lightweight composite material that equally resists the perforation to provide protection for personnel like in sandbags and is easy to transport and construct the bunker wall. Proposed Model Present Model.

[Audio] Methodology Propose a Sandwich Composite for Bunker Application Investigate and optimized the Ballistic behavior of Face sheet and core Composite Prepare the optimized Sandwich Composite Sample Identify the face sheet and core material for the Proposed Composite FE modelling of face sheet, core and sandwich composite for different configurations Determine the Ballistic Behavior of Sandwich Composite Experimentally Determine the Mechanical Properties of Composite Coupons according to ASTM Standard Experimentally Properties estimation through Material Designer Properties estimation through ROM NO Design, Fabrication, and Testing of Interlocking Arrangements of Optimized Sandwich Composite v Analysing the Impact Behaviour of the Identified Composite using FE Modelling Fabricate the Composite Coupons using Compression Molding and Hand Lay up Technique YES Bullet Arrested?.

[Audio] Configuration for Proposed Composite Stiff Face sheet Stiff Face sheet Flexible Core Impactor Epoxy + Luffa Mat + Cenosphere Epoxy + Luffa Mat + Cenosphere Natural Rubber + Luffa Proposed Configuration Varying Velocity from 200 m/s to 500 m/s Varying Thickness from 20 mm to 200 mm Varying Filler Material from 0 to 20% 31-05-2026 Dept. of Mechanical Engg. NITK, Surathkal.

[Audio] FE Modelling The methodology used in commercially available software is divided into three parts: pre-processing, solution, and post-processing. The goals of pre-processing are to develop an appropriate finite element mesh, assign suitable material properties, and apply boundary conditions. The solution phase involves obtaining the solution for the model. The processing phase provides the results on a model as contours and vector plots to summarize the results. Pre-processing Processing Post-processing.

[Audio] Steps involved in multiscale modeling of composite material for elastic properties evaluation using Material Designer Module.

[Audio] Material Designer Module. 31-05-2026. Dept. of Mechanical Engg. NITK, Surathkal.

[Audio] Material Designer Module Outcome The reliability of the RVE twill weaving simulation technique was demonstrated through multiscale modeling and experimental validation, and the results were shown to be in close agreement with the experiments. Meshed representative volume element of LCE composite with twill weaving type of fiber arrangement's composite properties for LCE composite with twill weaving type of fiber arrangement's.

[Audio] Steps involved in Explicit Dynamics simulation to Evaluate Energy Absorption for Composite Material.

[Audio] Bullet and target used to obtain Energy absorption through FEM Bullet Diameter = 7.62 mm Bullet Length = 30 mm Bullet Mass = 8.9619 gm Bullet Material = Steel 1006 (NIJ Standard-0101.06 2008) Target for Simulation Bullet for Simulation Target Cross section = 150*150 mm Target Material = Composite Material.

[Audio] Finite Element Simulation to obtain Energy absorption of Sandwich composite blocks Meshed Model Bullet and Target Undeformed Model Deformed Model.

[Audio] Energy absorption for sandwich composite target with elastic properties computed through ROM and FEM.

[Audio] . 31-05-2026. Dept. of Mechanical Engg. NITK, Surathkal.

[Audio] Fig. Sample LCE01 and LCE08 before and after fracture. Fig. The fractured surface of LCE08 revealed crack propagation in multiple directions and the presence of dangling fillers. Fig. fracture mechanism based on energy absorption capacity. 31-05-2026.

[Audio] . 31-05-2026. Dept. of Mechanical Engg. NITK, Surathkal.

[Audio] Finite Element Simulation to obtain Energy absorption of Bunker Made by composite blocks Sandwich 70 mm with 10 mm sand fills.

[Audio] Sandwich 80 mm with 20 mm sand fills. 31-05-2026.

[Audio] Sandwich 90 mm with 30 mm sand fills. 31-05-2026.

[Audio] Sandwich 100 mm with 40 mm sand fills. 31-05-2026.

[Audio] . 31-05-2026. Dept. of Mechanical Engg. NITK, Surathkal.

[Audio] Interlocking Block Design of SELF-LOCKING COMPOSITE WALL UNIT TOP VIEW BOTTOM VIEW SIDE VIEW FRONT VIEW.

[Audio] Interlocking Block Design of SELF-LOCKING COMPOSITE WALL UNIT PERSPECTIVE VIEW ANOTHER PERSPECTIVE VIEW.

[Audio] . 31-05-2026. Dept. of Mechanical Engg. NITK, Surathkal.

[Audio] Sandwich composite wall for bunker creation.

[Audio] 31-05-2026. 31-05-2026. Dept. of Mechanical Engg. NITK, Surathkal.

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