| Summary: | Stress analysis simulation is used to determine stress distribution in implant.
Femoral stem that is designed have to can be made by cold forming, so cold
forming simulation is required to determine whether the manufacturing process of
design is possible with cold forming or not.
Hip prosthesis implant design was a hip prosthesis with cement. Stress
analysis simulation was performed by static loading which was taken at peak load
when walking, running, stumbling, one leg stand, stair climbing, and variation of
hip prosthesis design consist of femoral stem 6 mm and 8 mm thickness, hole and
without hole hip prosthesis. In the simulation, implant was inserted to femur bone
with assumtion that femur bone was aranged by cancellous, cortical bone, and
bone cement. Materials for femoral head and femoral stem were stainless steel
316L. Cold forming simulation used displacement in vertical direction to
deformed stainless steel 316L plate. Pressuring component moved in vertical
direction as long as 20 mm. Pressuring component movement was causing
deformation on plate and filled the space of dies. Pressuring component and dies
were ridig body.
In stress analysis simulation, Femoral stem with plate thickness 8 mm was
the best design. Maximum stress occured when stumbling loading condition.
Maximum stress in femoral stem 8 mm thickness was 428 MPa and 613,6 MPa in
femoral stem 6 mm thickness. Hole in femoral stem didn�t give serious affect on
maximum stress. Cold forming process when pressuring component moved 13
mm, the plate had been deformed and filled all of dies space. When plate moved
from 14 mm to 15 mm, it just increased yield strength from material. Plastic strain
indicated that new shape of plate could not back to initial shape
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