The coil tube spring, a new type of spring, has been recently used in engineering. This paper presents a method for reliability-based analysis of a coil tube spring. A technique, using the perturbation method and reliability-based design theory, is employed to present a practical and effective method for the reliability-based analysis of a coil tube spring. Theoretical formulae of the reliability of a coil tube spring are obtained. The given approach can be used to determine the reliability of a coil tube spring accurately and quickly.
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