SMA Linear Elongation Ring

The Shape Memory Alloy (SMA) Linear Elongation Ring is a lightweight, compact thermal actuator that produces controlled linear expansion when electrically or thermally triggered. Engineered from high-performance NiTi alloy, the ring leverages solid-state phase transformation to generate mechanical work with no motors, gears, or combustion.

Upon heating above its Austenite start temperature (Aₛ′), the SMA ring elongates linearly, producing force ideal for precise, shock-free mechanical functions. This makes it well-suited for next-generation aerospace, aviation, and maritime systems requiring reliable, clean, and efficient actuation.

Technical Specifications

Austenite Start Temperature (Aₛ′) ≥ 70 °C / ≥ 80 °C / ≥ 90 °C (configurable)

Recovery Strain (ε₀ @ 5% compressive preload) ≥ 4%

Recovery Stress (σᵣ @ 5% compressive preload) ≥ 600 MPa

Typical Applications

The SMA Linear Elongation Ring is adaptable to a wide variety of structural actuation tasks, including but not limited to:

Deployment of satellite solar arrays and antenna structures

Separation of payloads, covers, or equipment modules

Activation of mechanical locks, release restraints, or unlatching mechanisms

Passive or thermally triggered mechanical deployment systems

Case Example: Lock-Release Mechanism in Spacecraft

A representative use case of this actuator is its integration into lock-release mechanisms for spacecraft. These mechanisms are responsible for securing deployable structures—such as solar wings or instrument arms—during launch, and unlocking them in orbit.

In this setup, the SMA ring is preloaded around a notched bolt or mechanical latch. Upon receiving a thermal trigger, the ring elongates linearly, driving a release action through either shearing or disengaging the locked element. This enables clean, controlled, and shock-free deployment of mission-critical components.

Bolt Head Lock with Bottom-Mounted Configuration

The document shows the technical information of Bolt Head Lock with Bottom-Mounted for satellite solar array deployment.