Experimental study on the performance of multi-layered bulletproof vest

A bulletproof vest should have high strength and durability to resist a bullet as vital war equipment. However, the cost of creating good quality bulletproof vest is expensive. Therefore, research about an alternative bulletproof vest with affordable cost and competitive quality is needed. This research aims to review and compare two alternative vest types with one commercial type IV vest. Both alternative vests have similar components, except the second one has an additional Ultra High Molecular Weight Polyethylene (UHMWPE) component. The ballistic test shows that alternative vests are still not enough to resist a 5.56 mm bullet, but it has the potency to handle a 9 mm bullet. Furthermore, the influence of UHMWPE to resist 9 mm bullets is shown in this research

Finite Element Analysis on ballistic impact performance of multi-layered bulletproof vest impacted by 9 mm bullet

Simulation is one of the most effective ways to reduce the cost and time needed to test the quality of a bulletproof vest. The widely applied method to predict the behavior of the materials is a macro-homogeneous model. However, even though it is low in computational cost, it has some accuracy issues. This work presents finite element analysis with both macro-homogeneous and meso-heterogeneous models to predict the behavior of the Kevlar composites during ballistic impact and qualitatively compares the simulation results with the experimental ones. The simulation reliability was ensured by numerical parameters such as the system energy balance and the limitation of artificial energy. The simulation results showed that the meso-heterogeneous yarn model successfully produced more detailed impact damage than the macro-homogenous model. In addition, the deformation of the Kevlar, the bullet, and the steel plate was close to the experiment results. The result was expected to be used as a consideration in determining the model type for another similar research

Finite Element Analysis on ballistic impact performance of multi-layered bulletproof vest impacted by 9 mm bullet

Simulation is one of the most effective ways to reduce the cost and time needed to test the quality of a bulletproof vest. The widely applied method to predict the behavior of the materials is a macro-homogeneous model. However, even though it is low in computational cost, it has some accuracy issues. This work presents finite element analysis with both macro-homogeneous and meso-heterogeneous models to predict the behavior of the Kevlar composites during ballistic impact and qualitatively compares the simulation results with the experimental ones. The simulation reliability was ensured by numerical parameters such as the system energy balance and the limitation of artificial energy. The simulation results showed that the meso-heterogeneous yarn model successfully produced more detailed impact damage than the macro-homogenous model. In addition, the deformation of the Kevlar, the bullet, and the steel plate was close to the experiment results. The result was expected to be used as a consideration in determining the model type for another similar research

Design Improvement of Pindad Mini Excavator Boom Using Finite Element Method

This paper presents the analysis of mini excavator excava 50 with a focus on the boom component. The boom component is a component that has a heavy workload. The material used in the existing design is SM490A. The results of the analysis are still not safe because allowable stress is less than working stress. The material in the existing design was replaced with Hardox 400. The design is declared safe. However, the costs of the product have increased because Hardox 400 materials are more expensive than SM490A. To reduce the costs of the product, design improvement is needed to optimize the use of material. The design improvement method that uses in this study is according the optimization method, that is sizing and shape optimization. After improvement the design, to predict how long the boom component can be used, fatigue life prediction is calculated using Goodman's theor

Experimental study on the performance of multi-layered bulletproof vest

A bulletproof vest should have high strength and durability to resist a bullet as vital war equipment. However, the cost of creating good quality bulletproof vest is expensive. Therefore, research about an alternative bulletproof vest with affordable cost and competitive quality is needed. This research aims to review and compare two alternative vest types with one commercial type IV vest. Both alternative vests have similar components, except the second one has an additional Ultra High Molecular Weight Polyethylene (UHMWPE) component. The ballistic test shows that alternative vests are still not enough to resist a 5.56 mm bullet, but it has the potency to handle a 9 mm bullet. Furthermore, the influence of UHMWPE to resist 9 mm bullets is shown in this research