A method is described for performing the tensile strength of fragile material studies using electromagnetically launched expanding composite ring. The working principle is analyzed, where a fast-discharge capacitor system generates magnetic forces between the solenoid and driving ring, which accelerates radial velocities of the specimen rings. The dynamic measuring methods of instantaneous current and mechanical testing are established for analysis of electrical character and tensile strength of fragile specimen. The current pulse was tested experimentally which was provided by a capacitive discharge with the load solenoid connected in series with the power supply alone. It is shown that experimental results match the theoretical analysis well.