[Relationship between the vertical loop structure and the mechanical properties.].

PURPOSE: The relationship between vertical loop structure and its mechanical properties was investigated in order to provide reference data for more proper use of vertical loop. METHODS: According to the acting manner in use, finite elements model of vertical loop was established and the finite elements software ANSYS was used to simulate the mechanical characteristics of the loops. The simulated data were summarized at the end. RESULTS: The force and moment decreased with the increase of arm length, height and arc radius of the loop. The ratios of force to moment (M/F) decreased with the increase of arm length, but increased with the increase of height and arm radius. When the interval between the vertical arms enlarged, the force and moment rose and the M/F did not vary significantly. CONCLUSION: To satisfy the requirement of individual patient, the structure of loop can be adjusted properly to output mediate force, moment and M/F value.

[Stress analysis of separators with different specifications].

OBJECTIVE: To evaluate the shape and structure of different separators affecting the mechanical behavior. METHODS: The stress of different separators was analyzed by ANSYS software. Various separators were meshed into one-dimensional solid elements and the material character parameters were inputted. The loads were added gradually. RESULTS: The stress was related to the arm of force and the point of force application. CONCLUSIONS: The force applied can be controlled by selecting different separators.