To reveal contact stress and deformation distribution of short harmonic reducer in robotic joints under different loads
an unloaded surface to surface contact finite element model between flexspline and wave generator is established. The boundary condition of the engagement between flexspline and rigid spline is evaluated according to the experimental engaging force formula. The stress and deformation of the flexspline are solved by precondition conjugate gradient method
and the relationship with varying loads are analyzed. It is found that the deformation and stress increments on the flexspline ring cross section increase geometrically with heightened load
and the distributions of the deformation and stress increments remain unchanged. The conclusions are compatible with the cases of unloaded flexspline deformation
flexspline destruction and axial stress distribution under load.
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references
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