Material based writing fos
It is common to get confused on which one to use. Let us take a quick look into both safety factors. Understanding them would help us to use the right safety factor for our fatigue analysis. It should be noted here that both these safety factors are based on the assumption that fatigue loading defined by the user is linear and elastic since a scale factor is being applied to those loading definitions.
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It is common to get confused on which one to use. Let us take a quick look into both safety factors. Understanding them would help us to use the right safety factor for our fatigue analysis. It should be noted here that both these safety factors are based on the assumption that fatigue loading defined by the user is linear and elastic since a scale factor is being applied to those loading definitions. As a general definition, FOS can be termed as a factor which, when applied to the elastic stresses from FEA at a node, will produce the corresponding design life at the node.
The significant advantage of using FOS comes from the ability of user to calculate safety factor based on target life of the component. Elastic stress history is recalculated using scaled stress. The fatigue life is then recalculated. This process is repeated with different scale factors until it finds the scale factor to give the required design life. This makes the method more generic and broadens its application to complex loading history and low cycle fatigue analysis.
The method takes longer computational time but is more accurate. It can be applied to calculate safety factor for both target life as well as infinite life of the material. FRF is a linear scale factor obtained from mean stress corrections such as Goodman, Gerber etc. They are used to calculate stress based fatigue safety factors FRF for a calculated life against infinite life of the material or a target life specified by user.
The ratio of the distance to the infinite life line and the distance to the cycle Sa, Sm is calculated for each extracted cycle, to produce four FRF types — horizontal, vertical, radial and the worst of the three.
FRF analyses can be applicable when used for infinite life of the material or for finite life with constant amplitude load. This is rarely the case. As in real world problem, the loading is complex and the fatigue life calculation many a times be done for finite life with loading variation. FRF over predicts safety factors specially when used with variable amplitude loading and user defined target life due to the inability of the FRF to rescale the elastic stresses hence never be used in that scenario.
To summarize, FOS is more accurate in predicting the safety factor given the realistic scenario of complex loading and user defined target life. FRF on the other hand works well only when the loading is constant amplitude for a user specified target life or when loading is variable amplitude but against endurance limit of the material. Although FOS is expensive than FRF, it is the most recommended method in FE-SAFE because is applicable to both complex and constant amplitude loading and to both target life and infinite life or endurance limit of the material.
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Materials physics, an option in the physics major, prepares students for high-tech employment in industries that have needs for better materials, such as companies improving optical fibers, transportation, electronics, communications, alternative energy sources, medicine, and a wide range of consumer goods.
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