The EBAD Mini Frangibolt^® Actuator is rated to have a minimum life of 50 cycles. For continued testing and preparation for final installation, EBAD provides a mechanical reset tool as shown which will generate the force and stroke required to compress all the Mini Frangibolt^® styles.

Compression of the Mini Frangibolt^® Actuator is a simple 3 step process: First, install the unit in the fixture using the adapter provided. Second, tighten the drive screw using a torque wrench until the specified torque value as indicated on the reset tool has been reached.  Third back off the drive screw and remove the actuator.  The whole process may be carried out in less than 30 seconds. Furthermore, the size and weight of the Mini Frangibolt^® Compression Fixture make it fully portable allowing easy transport.

The Fasteners used in the Frangibolt^® Actuator release system are an integral part of the mechanism. For all Frangibolt^® Actuator sizes, a significant amount of testing was performed to derive the optimum material, notch profile and notch diameter. These features must remain constant for all applications. As per our ICD’s

• • Standard Hex head Ti Fastener (F19155.xx)
  • Standard Double Sided Thread Fastener (F22111.xx)

  Customers may also submit there own drawings for EBAD approval.

  TiNi™ Fasteners are manufactured per strict tolerances and procedures involving both individual and lot-level testing and inspection.

  The picture below illustrates some of the more common Fastener configurations that have been successfully used. Each suits a different type of Frangibolt^® Actuator joint design and lends enormous versatility to this unique product. For custom fasteners additional charges apply.*Fasteners are made from 6AL-4V Titanium per AMS 4965 with a minimum tensile strength of 160 Ksi (1104 MPa) Note: All values are approximate and for reference only. Contact EBAD for detailed ICD (Interface Control Drawing).

  Fastener Examples

  

TiNi™ Frangibolt® Actuator | F19155 Configuration Validator

The Washers used in the Mini Frangibolt^® Actuator assembly are an important part of the mechanism. They serve the following critical functions:

• • They distribute the relatively high recovery stress generated by the SCSMA cylinder during actuation, on a much larger contact area.
  • G10 washers provide thermal isolation and it is highly recommended to install between Mini Frangibolt® Actuator and the structure.
  • They have minimum thickness so as to minimize the overall length of the joint.
  • They have chamfers specially designed to match fillet radiuses of NAS bolts (at the location where the bolt head meets the bolt shank).
  • They have tighter fitting inner diameters designed to clear NAS bolt shanks while at the same time maximizing coverage of the SCSMA cylinder.

Product Details

*Note: All values are approximate and for reference only. Contact EBAD for detailed ICD (Interface Control Drawing).

Custom lock nut shown on this page have been widely used with the Mini Frangibolt^® Actuator release mechanism. They offer the following key features:

• They are made from Solution Treated and Aged Titanium  6AL-4V STA.
• They have locking helicoil inserts made out of 304 stainless steel with a minimum tensile strength of 74 ksi.
• They have a washer face for more even  load distribution.
• They offer a higher profile than other NAS nuts thereby increasing the number of threads engaged and reducing the stress in the thread.

Note that not all Mini Frangibolt^® Actuator designs require a nut as many thread directly into a flange or structure. In this case, it is important that the threaded connection be designed to withstand the tensile strength of the notched Frangibolt^® Actuator.

The enclosure shown is a generic design meant to show how the Frangibolt^® Actuator can be held down and retained after actuation. This is done using a thin walled aluminum housing which is held down using a low profile ring. Note that making these 2 parts as separate pieces allows the enclosure to be rotated into the exact position desired for each application. A third component in the form of a silicon rubber dampener is incorporated inside the can to avoid metal on metal impact during actuation.

In many cases a separate enclosure (as shown) is not necessary because such a means can be designed directly into the releasable joint.

*Note: All values are approximate and for reference only. Contact EBAD for detailed ICD (Interface Control Drawing).

The Switch Washer is a combination Switch and Washer developed as a simple means of determining when the Frangibolt^® Actuator has functioned. It comprises of a top and bottom bearing surface, internally mounted spring, and a pair of mating electrical contacts. The spring is preloaded to generate more than 3 lbs of force to keep the top and bottom surfaces separated thereby firmly biasing the switch to the Open position. However, once installed on a bolted joint and tightened to the prescribed torque, the top and bottom surfaces are brought together closing the switch contacts and preloading the Mini Frangibolt^® Actuator joint assembly. The switch contacts remain closed until the Mini Frangibolt^® Actuator releases the tension by breaking the bolt during actuation. At this time, the spring once again returns the Switch back to the Open position within a fraction of a second.

The Switch-Washer may be used in one of two ways: It can be wired in series with the Mini Frangibolt^® Actuator to act as an automatic shut-off switch, or it can be wired as part of a separate circuit to serve as a feedback loop to a controller.

*Note: All values are approximate and for reference only. Contact EBAD for detailed ICD (Interface Control Drawing).