The effects of low cycle fatigue comparing compact tension and center-cracked specimens at elevated temperatures

✍ Scribed by A.N. Palazotto; C.L. Henkel

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 830 KB
• Volume: 24
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(86)90222-5

✦ Synopsis

IMe work has been pubfished related to cychc loading of material at high temperatures. This paper presents a study of a superalloy, IN-K@, at 1350°F in which a reversed loading cycle ratio of R = -1 is carried out. Comparisons of results are made using different load frequencies and geometries at a maximum K, = 45 ksi,/in. This investigation extends a previous analysis of the stress field and plastic zone ahead of the crack tip by considering three cases : a 2.5 HZ compact tension specimen, a O.J@ Hzeompact tension specimen and a 2.5 Hz compact center crack specimen. The imprisons point out findings that were taken for granted using dastic anafysis, but appear to be somewhat different due to the viscoplastic nature of the environment.