![]() ![]() One cycle of this type of fatigue loading occurs when a tensile stress of The worst case of fatigue loading is the case known as fully-reversing load. Wires have a constant static tensile load from the weight of the bridge, and an additional tensile load when a train is on the bridge. The suspension wires in a railroad bridge are an example of this type. ![]() An example of this type of loading is a chain used to haul logs behind a tractor.Īnother type of fatigue loading is a varying load superimposed on a constant load. The load is removed, so the part goes back to the no-load condition. ![]() One type is zero-to-max-to zero, where a part which is carrying no load is then subjected to a load, and later, There are different types of fatigue loading. Do real-world parts behave the same as laboratory tests?.Why is the surface of a part so important?.Does the strength of a material affect its fatigue properties?.How do you determine the fatigue strength of a material?.The following information on this page attempts to explain metal fatigue by answering several common questions: When you bend a paper clip back and forth until it breaks, you are demonstrating low-cycle fatigue behavior. This behavior became known as "FATIGUE"īecause it was originally thought that the metal got "tired". They discovered that as they reduced the magnitude of the cyclic stress, the part would survive more cycles before breaking. These relationships were first published by A. Than the Yield Stress ( UTS and YS are explained in Stress and Strain). Long ago, engineers discovered that if you repeatedly applied and then removed a nominal load to and from a metal part (known as a "cyclic load"), the part wouldīreak after a certain number of load-unload cycles, even when the maximum cyclic stress level applied was much lower than the UTS, and in fact, much lower Metal Fatigue - Why Metal Parts Fail From Repeatedly-Applied Loads NOTE: All our Products, Designs, and Services are SUSTAINABLE, ORGANIC, GLUTEN-FREE, CONTAIN NO GMO's, and will not upset anyone's precious FEELINGS or delicate SENSIBILITIES. ![]()
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