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Finite element method based analysis of lower body structural strength on rekarya ev electric car

Introduction

Finite element method based analysis of lower body structural strength on rekarya ev electric car. FEM analysis of Rekarya EV electric car lower body structural strength. Evaluates von Mises stress, displacement, and safety factors for varying steel thicknesses, optimizing strength-to-weight ratio.

Abstract

In line with current technological developments, the use of electric vehicles is expected to increase due to their environmentally friendly nature—primarily because they produce no exhaust emissions. One of the critical structural components of an electric car is the lower body. The lower body of the Rekarya EV has been specifically designed to accommodate three rows of seating. This study aims to evaluate the structural strength of the Rekarya EV's lower body under static loading conditions by analyzing von Mises stress, displacement, and safety factor values. The analysis was carried out using the Finite Element Method (FEM) through Autodesk Inventor Professional 2020. A static stress analysis was performed using ASTM A36 steel material with three different thickness variations: 1.0 mm, 1.2 mm, and 1.4 mm. The resulting von Mises stress values were 72.88 MPa, 62.24 MPa, and 51.66 MPa, respectively. The corresponding displacement values were 1.366 mm, 1.295 mm, and 1.212 mm. The calculated safety factors were 3.41, 3.99, and 4.8. Additionally, the total weight of the lower body for each thickness was calculated as 88.012 kg, 100.823 kg, and 113.613 kg. The results indicate that all three thickness variations provide adequate safety factors; however, increasing material thickness significantly affects the overall weight of the structure. Therefore, a balance between strength and weight must be considered in the design process.

Review

This paper presents a timely and relevant analysis of the lower body structural strength for the Rekarya EV, addressing a critical aspect of electric vehicle design and safety. Utilizing the Finite Element Method (FEM) with Autodesk Inventor Professional 2020, the study systematically evaluates the von Mises stress, displacement, and safety factor for three different thicknesses (1.0 mm, 1.2 mm, 1.4 mm) of ASTM A36 steel. The clear presentation of quantitative results, including stress, displacement, safety factor, and total weight for each variation, effectively demonstrates the structural integrity and the significant trade-off between material thickness and overall vehicle weight. This foundational work provides valuable insights into the initial structural design considerations for the Rekarya EV's lower body, particularly given its three-row seating configuration. While the study successfully demonstrates the safety of all tested thickness variations under static loading conditions, a few aspects could benefit from further detail. The abstract states "static loading conditions," but does not elaborate on the specific magnitude, distribution, or nature of these loads (e.g., passenger weight, luggage, or a specific test standard). Providing this context would significantly enhance the interpretability and applicability of the reported stress and displacement values. Furthermore, clarifying the yield strength of ASTM A36 steel used for the safety factor calculation would add robustness to the analysis. Despite these minor points, the methodological approach is sound, and the identification of the strength-to-weight balance as a critical design consideration is a valuable contribution. Overall, this research offers a solid preliminary assessment of the Rekarya EV's lower body structure. To further strengthen the work and advance its practical implications, future studies could consider incorporating dynamic loading scenarios, such as vibration analysis or crash simulations, which are vital for real-world automotive performance. Exploring alternative, lighter materials or advanced structural optimization techniques would also be beneficial in mitigating the weight penalty observed with increased thickness, thereby enhancing vehicle efficiency and range. Additionally, a discussion on the specific design criteria or target safety factors adopted for the Rekarya EV would provide a clearer benchmark against which the presented results can be evaluated.

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