![]() ![]() The list below details the key properties: To improve the torsional rigidity of a design, there are a few material properties to consider. The next section will walk through the properties that make this possible. The design on the left ( Steel ) is has a higher torsional rigidity and therefore lower stress than the design on right ( HDPE ). There is a small “flag” modeled on the outside of the shaft to give a visual of the feature twisting as the torque is applied. The images below show two shafts that each have 100 ft-lbs of torque acting on them, but their deflection will be different because they have different torsional rigidities. In reference to the previous drive shaft example, if the shaft is twisted too much, unstable performance may result, so choosing a shaft with higher torsional rigidity would result in a more stable mechanical interface. ![]() As torsional rigidity increases, the torque required to produce a twist of one-unit angular measurement per one unit length of the shaft, increases. Torsional rigidity is the object’s torsional resistance to twisting as a torque is applied to the component and is dependent on a components geometry. This article will review methods to improve a design’s torsional rigidity. This article will walk product designers and engineers through the methods used to analyze and improve torsional rigidity in design. One example of torsion is the twisting that occurs in a driveshaft when the throttle is applied in a race car. Torsion may be defined as the twisting effect that occurs in a body when a torque, or a twisting force, is applied to it. The main differences are the specific material property to be used (Shear Modulus or Modulus of Rigidity) and the polar moment of inertia (which is very similar to the area moment of inertia used in bending). ![]() Products that are subject to a torsional load often require analysis like the analysis used for bending stiffness. ![]()
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January 2023
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