Abstract : This paper focuses on a novel triangular shaft-hub connection method used in military weapons and Formula 1 racing cars. Solid modeling of the triangular shaft-hub was performed using Pro/Engineer software, with the maximum interference fit in the transition fit selected as the analysis object. The static analysis module of ANSYS software was applied to analyze the highly nonlinear surface contact stress changes and torsional stress changes caused by different loads during operation, yielding stress and strain distribution contour maps for the triangular shaft and hub. This provides a theoretical basis for the design and improvement of triangular shaft-hub connections. Keywords: Triangular shaft-hub connection; Surface contact analysis; Torsional stress analysis 0. Introduction The triangular shaft-hub connection, as a novel connection method, offers advantages over traditional key-and-keyway connections, including high connection strength, automatic centering under load, maintaining dynamic balance between the shaft and rotating parts, large torque transmission, no stress concentration, and low vibration and noise during transmission. It is highly suitable for connecting transmission components with high rotational speeds, large torque transmission, and low noise requirements. Currently, triangular hub connections are mainly used in military equipment, high-precision tool systems, and torque transmission in F1 racing cars. Due to the limitations and special characteristics of triangular hub connections, there is relatively little research on the basic theory and related technologies of this type of hub connection by experts and scholars at home and abroad. This paper uses Pro/Engineer Wildfire 2.0 to establish a three-dimensional solid model of a triangular hub and imports the solid model into ANSYS 10.0. Using the ANSYS statics analysis module, the highly nonlinear surface contact stress changes and the torsional stress changes caused by different loads during operation are analyzed and studied, providing a theoretical basis for the design and improvement of triangular hub connections. 1. Triangular Mathematical Model 1.1 Parameter Relationship of Triangular Curve First, using the powerful mathematical functions of Maple, a triangular mathematical model of D mm m = 25 is established based on the equation of the triangular curve (Figure 1). As shown in the figure, the triangular curve has an inscribed circle D1, an circumscribed circle D2, three circumscribed points, and three inscribed points. Analyzing the parametric relationships between the triangular shapes yields the following conclusions: (Full text download of finite element analysis of triangular hub connections)