Aluminum alloy AW5754 is extensively used in the automotive industry due to its numerous advantages, including body weight reduction, good corrosion resistance, weldability, and ease of processing and forming. The vehicle components produced from this alloy are often subjected to multiaxial loading at varying strain rates and amplitudes. Therefore, it is essential to accurately analyze the material's fracture behavior under such loading conditions to predict its mechanical response. However, the tensile test results of the standard specimens, even when conducted at different strain rates, may not adequately capture the overall fracture behavior of the material under multiaxial loading conditions. To accurately determine and model the fracture initiation behavior of the material under varying stress states, it is essential to test different specimen types that represent a range of stress conditions. The measurement should then be used to develop appropriate mathematical models that capture the material's fracture in these stress states. This study investigates the effect of strain rate on the predicted fracture behavior of AW5754 aluminum alloy under multiaxial loading conditions. The primary objective is to derive the triaxiality locus, a diagram illustrating the relationship between the equivalent plastic strain to fracture and the stress triaxiality factor. Various experiments involving different sample geometries under various strain rate axial loadings are conducted to obtain the necessary data for the analysis. Uniaxial tensile tests are performed on eight specimen types, each with different notch geometries, to determine different stress states in the samples. Accurate deformation measurements are obtained using extensometers positioned at critical points. These tests are repeated for three different strain rates, including quasi-static loading conditions. Using the data collected from these experiments, finite element (FE) models are parametrized and executed to calculate the equivalent plastic strain and stress triaxiality factor. The simulation results are compared with experimental measurements to validate the accuracy of the models. Subsequently, the simulation outcomes are used to generate a stress triaxiality locus through a curve-fitting process. An exponential curve correction function is employed to appropriately model the relationship between the equivalent plastic strain to fracture and the material's stress state. By determining the triaxiality factors and integrating both experimental and numerical techniques, this study offers valuable data and insights to accurately predict fracture stress and evaluate the stress state of structures made of AW5754 alloy under varying loading speeds.