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Pandurang Naik

What is the difference between duty cycle safety factor and load case safety factor of a gear?

(This Q&A has been posted by Hexagon Technical Support for the benefit of our community members)

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    Load case safety factor is calculated by considering permissible (allowable) stress and actual stress. Load case safety factor is = Permissible stress / Actual stress. Duty cycle safety factor is calculated by iterative method. 

    Romax ensures that the total damage from all load cases equals 100% by applying an iterative method that uses a scaling factor. This scaling factor is referred to as the duty cycle safety factor. Please refer ISO 6336-6 section 5.4.

    For example, if the combined damage from all load cases exceeds 100%, Romax applies a scaling factor less than 1 to reduce the total damage to exactly 100%. The specific scaling factor at which the sum of damages equals 100% is defined as the duty cycle safety factor.

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