Download or read book The High Temperature Viscoplastic Fatigue Behavior of a Compact Tension Specimen Using the Bodner Partom Flow Law written by James E. Keck and published by . This book was released on 1982 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Few studies have been made concerning the effects of low cycle fatigue on the stress/strain field or the plastic zone size ahead of a crack tip in a high temperature environment. Experiments using a superalloy IN-100 at 732 C have shown crack growth during fatigue is slower than the growth rate during long periods of sustained load. These investigations also show that crack growth rates during hold periods after fatigue cycling are dependent on the cycle frequency. This study focuses on fatigue as it effects the changing stress field and plastic zone ahead of a crack tip. Finite element modeling was accomplished using an in-house computer program named VISCO, which was modified to incorporate load cycling. A compact tension specimen geometry was modeled using the Bodner-Partom viscoplastic constitutive equations to describe the material behavior. Results show that material behavior near a crack tip closely correlates to uniaxial material response data under stress controlled loading. During cyclic loading, the greatest plastic deformation near the crack tip occurs in the first load cycle. Computations show that IN-100 displays significant amounts of time dependent inelastic behavior.

Download or read book The High Temperature Viscoplastic Fatigue Behavior of a Compact Tension Specimen Using the Bodner Partom Flow Law written by James E. Keck (MAJ, USAF.) and published by . This book was released on 1982 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The High Temperature Viscoplastic Fatigue Behavior of IN 100 Using the Bodner Partom Flow Law written by R. E. Wilson and published by . This book was released on 1983 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: Few studies have been made on the stress/strain field or plastic zone size ahead of a crack tip in a high temperature environment under varying load frequencies and stress levels. Fewer studies have incorporated compressive loads or analyzed the effect of a negative R-ratio on the fatigue characteristics of the superalloy IN-100. This study involves extending existing analysis of the stress field and plastic zone ahead of a crack tip in a compact tension specimen, through a larger number of load cycles and examining the nearly unexplored area of compressive loading of a crack in a superalloy. A USAF Materials Laboratory finite element computer program named VISCO was used for this study. The Bodner-Partom viscoplastic constitutive equations for describing the material behavior were utilized. Load spectra included various frequencies with R-ratios of 0.1 and -1.0 (zero mean load). (Author).

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Download or read book The High Temperature Viscoplastic Fatigue Behavior of IN 100 Using the Bodner Partom Flow Law written by Roy E. Wilson (1LT, USAF.) and published by . This book was released on 1983 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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