Additively manufactured energy absorbing strut device

An aircraft seat frame, comprising:

• a first frame component;
• a second frame component;
• and
• an energy absorbing strut device forming a connecting link between the first frame component and the second frame component, the energy absorbing struct device comprising:
• a cylinder body having an internal chamber and a first axial end attached to the first frame component;
• a piston having a first part disposed inside the internal chamber and a second part disposed outside of the internal chamber, wherein a piston head is formed at an axial end of the first part, and wherein an axial end of the second part is attached to the second frame component;
• a first deformable element positioned outside of the cylinder body, the first deformable element connected to the cylinder body and to the first part of the piston, the first deformable element configured to break, responsive to tension, to permit initial withdrawal of the piston relative to the cylinder body;
• and
• a second deformable element positioned inside the internal chamber and configured to be deformed by the piston head during continued withdrawal of the piston relative to the cylinder body.