Simulation Methods for MEMS S&A Devices for 2D Fuze Overload Loading

Area of Science:

• Mechanical Engineering
• Aerospace Engineering
• Materials Science

Background:

• Fuze safety and arming (S&A) devices require rigorous testing under extreme overload conditions.
• Existing testing methods face challenges in accurately simulating combined recoil and centrifugal overload scenarios.

Purpose of the Study:

• To design and validate an experimental testing system for simulating two-dimensional (2D) fuze overload loading.
• To address limitations in simulating recoil and centrifugal overload simultaneously in fuze S&A devices.

Main Methods:

• Developed a system integrating centrifuge rotation, impact acceleration simulation, and centrifugal rotation simulation.
• Established dynamic equations for the system and impact hammer motion.
• Utilized ANSYS/LS-DYNA for dynamic modeling and simulation of impact events.
• Performed 2D overload loading simulations and measured acceleration curves.

Main Results:

• The system successfully simulated recoil overload forces exceeding 10,000× g and centrifugal overload forces exceeding 1000× g.
• Feasibility of the proposed loading simulation method was verified through simulation and experimental tests.
• Acceleration curves were obtained, showing variations with centrifuge speed, cushion material, and buffer thickness.

Conclusions:

• The developed experimental system effectively simulates 2D fuze overload loading conditions.
• This provides a viable method for testing the reliability of fuze S&A devices under combined dynamic stresses.
• The system enhances safety and arming device development through accurate overload simulation.