HC series servohydraulic testing machine
Pulsating compressive strength tests (R=0.1) are performed on six specimens with a test frequency of up to 5 Hz. Result: Generation of an S-N curve with a number of cycles up to 5 million. This corresponds to approximately 2 years in vivo; approximately 7000 cycles per day. The first runout is confirmed.
In addition to purely axial tensile, compression and flexure tests, a pure or combined torsion load can be applied to spinal systems in compliance with standards including ASTM F1717-9, ASTM F2706-8 or ISO 12189-08.
These tests can be performed under physiological (in-vivo) conditions (for example, tempered saline solution) using a ZwickRoell thermoregulation bath.
For practical statistical evaluations of fatigue tests in the finite life range (high cycle fatigue) and in the transitional range to infinite life (long life fatigue), ZwickRoell offers the technical-scientific program SAFD (Statistical Analysis of Fatigue Data).
Testing of spinal implant constructs in a vertebrectomy model
Test arrangement with two vertebral replacement test blocks made of highly cross-linked plastic