Abstract
Electric chain hoists are often called upon to operate at or near their rated capacities at high duty cycles. A critical hoist component is its load chain, which is frequently manufactured from a carburizing, or case hardening, grade of nickel alloy steel. After thermal treatment, a chain link possesses a thin hard outer case and a tough inner core. Failure of load chain is frequently associated with pitting of the link surfaces that contact other links. Nonlinear finite element analysis of the stresses and deformations due to the contact of two chain links with each other are conducted. Results indicate that shakedown occurs after one or two load cycles and that the presence of friction alters the stress field so as to encourage pitting.
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