Research on Elastoplastic Strain Correction Factor of Titanium Alloy

The ASME and RCC-M codes include a detailed fatigue evaluation based on elastically predicted stresses. A prerequisite for the fatigue analysis is that the primary-plus-secondary stress range does not exceed 3Sm. If this limit is exceeded, the code provides "simplified Elastoplatic Analysis" rules for the fatigue evaluation. A Ke penalty factor is the most important parameter of this method. The ASME and RCC-M codes provides the codified expressions of Ke and material parameters for general materials of nuclear components, but there is no expressions and material parameters for the Titanium Alloy. The determination of Ke expressions and parameters for Titanium Alloy is discussed. A exemplary verification calculations of general materials that have been performed and the conservative allowance is obtained. Based on the results, the proposed Ke factors of Titanium Alloy has been determined and deliver the same sufficiently conservative results.