Thus, the concept of end hemispherical cavities (EHC) roller, which possesses enough strength against such catastrophic failures along with probability of higher fatigue life than solid roller, has been treated further. The flexibility of rolling elements can aid in reduction of contact stresses which eventually can increase fatigue life of rolling element bearings and that led to the hollow roller concept, however hollow roller concept encountered limitations in applications due to its catastrophic fractures at relatively lower loading conditions. Since fatigue life is the pivotal parameter in rolling element bearings, an enhancement in fatigue life has been enviable always.
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