Machine parts are used under load, which includes static loads of constant intensity and variable loads of varying magnitude. In most cases, they are subject to variable loads. In addition, the accumulation of repeated loads is known to lead to fatigue, which causes mechanical parts to break at stresses much smaller than the breaking stress induced by the original static load. So when designing mold parts with short molding cycles and high injection times, maintenance costs can be reduced by taking measures to increase the fatigue limit. This chapter examines fatigue failure resulting from variable loading, along with examples and solved/unsolved problems, and includes topics on dynamic behavior of materials, fatigue behavior, fatigue failure, fatigue load, variable (dynamic) load, residual stress, stress concentration, fatigue strength, endurance limit, fatigue variables, fatigue analysis, and fatigue life. This chapter can be used as teaching material for courses on machine design for mechanical and industrial engineering majors in colleges and universities, and can also be used as a reference for scientific and technical personnel engaged in scientific and engineering calculations.
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