Qualification test campaign for the 18kN Milli Release Nut

The Dcubed Milli Release Nut (mD3RN) is a compact, high-performance release actuator based on Shape Memory Alloy (SMA) technology, capable of sustaining and releasing axial loads of up to 18 kN. The actuator has been designed with a strong focus on low mass, compact form factor, and functional redundancy, while enabling a simple and rapid reset procedure that can be performed without the need for external tools.

This paper presents the qualification campaign carried out for the mD3RN, encompassing vibration, shock, and thermal vacuum (TVAC) testing, as well as an extensive life-cycle assessment. The test results confirm the actuator’s reliability in representative space environments and demonstrate its capability for rapid and repeatable reset, making it suitable for a wide range of space applications.