Abstract
A hands-on research initiative provides undergraduate and graduate students with direct experience in materials science, structural engineering, and automotive design. This project focuses on modifying and analyzing a 1974 International Scout to meet SCORE International competition standards for Baja desert racing. The study aims to assess the structural integrity and material performance of the vehicle’s frame after reinforcement with a front winch plate and skid, providing students with a practical application of materials engineering, welding processes, and mechanical analysis. The original front section of the Scout’s frame is composed of 0.125-inch low-carbon steel. It was MIG welded to a 0.250-inch wall thickness winch plate, designed to withstand the extreme forces of a 12,000-pound capacity winch. The primary objectives of this research are to determine whether the modified frame can sustain the applied winch-induced forces and to characterize the weld integrity and failure modes when joining dissimilar thicknesses of material. A critical aspect of the study is evaluating weld geometry, stress distribution, and failure mechanisms to establish an appropriate safety factor for real-world use.
To achieve these objectives, three distinct engineering analysis methods are utilized:
1. Finite Element Analysis (FEA) – Simulating stress distribution, deformation, and failure points under applied forces.
2. Hand Calculations – Using mechanical principles to validate computational findings and ensure accuracy.
3. Experimental Testing – Conducting tensile tests on a replicated welded frame section to evaluate weld strength and failure behavior.
Digital Microscopy is also employed to analyze the welds' microstructure, identifying grain size, grain orientation, phase transformations, and potential microstructural defects. The specimen preparation process includes sectioning, grinding, polishing, and etching to reveal key metallurgical features that influence the frame’s structural performance.
Preliminary results indicate that FEA and hand calculations predict adequate load-bearing capability with a reasonable safety factor. However, failure is expected along the vertical weld due to stress concentration in the heat-affected zone. Tensile testing suggests a lower safety factor than initially predicted, highlighting the importance of optimizing weld design, reinforcement strategies, and material selection.
This research enhances student learning by integrating theoretical concepts with real-world engineering challenges, preparing students for careers in materials science, mechanical engineering, and motorsports applications. The project demonstrates the value of hands-on experience in understanding welding processes, structural integrity, and performance analysis for high-stress automotive applications.