Abstract
A finite element method formulated by a total lagrangian method was used to calculate the nonlinear part of deformation. In the case of double beam load cells, when an off-center load is applied, axial forces of the beams produce a nonlinear bending strain. The nonlinear strain is proportional to the applied load and the off-center distance. The output of the nonlinear strain can be avoided by shifting strain gages to an appropriate position. The nonlinear strain distributions of load cells with thinned sections in beams are affected by the flexural rigidity along the beam. In the case of a center-beam load cell, the nonlinear strain is relatively small, but the deformation mode is more complicated compared to double-beam load cells.
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