Accession Number : ADA489314


Title :   Relaxation of Shot-Peened Residual Stresses Under Creep Loading (Preprint)


Descriptive Note : Journal article


Corporate Author : AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE


Personal Author(s) : Buchanan, Dennis J ; John, Reji ; Brockman, Robert A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a489314.pdf


Report Date : Oct 2008


Pagination or Media Count : 36


Abstract : Shot peening is a commonly used surface treatment process that imparts compressive residual stresses into the surface of metal components. Compressive residual stresses retard initiation and growth of fatigue cracks. During the component loading history, loading, or during elevated temperature static loading, such as thermal exposure and creep. In these instances, taking full credit for compressive residual stresses would result in a methodical approach for characterizing and modeling residual stress relaxation under elevated temperature loading, near and above the monotonic yield strength of IN100. The model incorporates the dominant creep deformation mechanism, coupling between the creep and plasticity models, and effects of prior plastic strain. The initial room temperature residual stress and plastic strain profiles provide the initial conditions for relaxation predictions using the coupled creep-plasticity model. Model predictions correlate well with experimental results on shot-peened dogbone specimens subject to single cycle and creep loading conditions at elevated temperature.


Descriptors :   *SHOT PEENING , *SUPERALLOYS , *STRESS RELAXATION , *CREEP , *RESIDUAL STRESS , DEFORMATION , SURFACE FINISHING , STRAIN(MECHANICS) , STRENGTH(MECHANICS) , ROOM TEMPERATURE , CRACK PROPAGATION , PLASTIC PROPERTIES , FATIGUE(MECHANICS) , NICKEL ALLOYS , COMPRESSIVE PROPERTIES , STATIC LOADS , HIGH TEMPERATURE , MODELS , PREDICTIONS , THERMAL PROPERTIES , METALS


Subject Categories : Fabrication Metallurgy
      Mechanics
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE