This study presents a comprehensive analysis of the mechanical properties of bio-inspired artificial muscles. A static mechanical model was developed using the Brinson constitutive theory. This model incorporates the phase transition parameters and accounts for the linear dependence of both the elastic modulus and strain response coefficients on these parameters. An advanced mechanical testing platform was designed and implemented to experimentally validate the model. The platform integrates a high-sensitivity force sensor, laser displacement sensors for precise deformation measurements, a temperature sensor, and a servo-driven linear motion system. The experimental results quantitatively characterized the voltage-dependent actuation performance under varying electrical driving voltages and mechanical loads (200, 300, 400, and 500 g) of the device. This study establishes a foundational framework for the quantitative application of these bio-inspired artificial muscles in scenarios demanding precise control of force, displacement, and temperature.