Exact(2)
Limitations are placed on the possible density ratios for the materials used in each test-mass pair, leading to the conclusion that a fully cyclical test for systematic errors is not possible.
The insights gained from such analyses are examined in relation to the cyclical test design process of constant review of items so that a high level of standardization is achieved.
Similar(57)
The fracture of the specimens subjected to cyclical tests occurred in the region of the contralateral cortex (Fig. 5), similar to the static tests.
Another disadvantage of these studies lies in the lack of cyclical testing that models in vivo situations more realistically than linear tests alone.
Fig. 5 Fracture of the contralateral cortical bone during the fatigue testing: The specimens failed by fracture of the contralateral cortical bone, similar to the static tests Fig. 6 Cracking of the contralateral cortex during the cyclical testing: Unlike the case of Activmotion 4 showed on the picture, the cracking was generally not observable.
The complex and time-consuming experimental setup, which allows real-time analysis, is not suitable for cyclical testing.
The objectives were to evaluate the Memory Metal Spinal System when compared to the DePuy Spine's Titanium Moss Miami Spinal System in the following test methods: 1. Static axial testing in a load to failure mode in compression bending, 2. Static testing in a load to failure mode in torsion, 3. Cyclical testing to estimate the maximum run out load value at 5.0 × 106 cycles.
The test protocol followed ASTM Standard F1717-96, Standard Test Methodss for Static and Fatigue for Spinal Implant Constructs in a Corpectomy Model". 1. Static axial testing in a load to failure mode in compression bending, 2. Static testing in a load to failure mode in torsion, 3. Cyclical testing to estimate the maximum run out load value at 5.0 x 10^6 cycles.
The plates and screws remained undamaged during the cyclical fatigue testing.
Likewise, none of the tibias reconstructed with locking plates failed cyclical load testing at 20,000 cycles, while 2/12 (17 %) of the tibias in the Steinmann pin group failed.
This consisted of load-controlled cyclical fatigue testing, with stepwise compression sinusoidal (frequency = 5 Hz) loading, where the force amplitude of each step was kept constant with feedback control of the force signal within the hydraulic machine.
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