Random loading fatigue life assessments for notched plates

✍ Scribed by Dimitar S. Tchankov; Akihiko Ohta; Naoyuki Suzuki; Yoshio Maeda

• Book ID: 104288857
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 274 KB
• Volume: 21
• Category: Article
• ISSN: 0142-1123
• DOI: 10.1016/s0142-1123(99)00078-x

✦ Synopsis

Fatigue tests were performed on double edge notched specimens made of JIS SM570Q steel. Four types of notched specimens were used and stress concentration factors were 1, 2, 3 and 4. Cyclic and random loading was applied to the specimens. Random loading was corresponding to Rayleigh distribution of stress ranges, and it was applied as randomized loading blocks. During the loading the maximum stress was kept constant and equal to yield strength while the minimum stress is changed randomly. This test condition is considered to avoid the complex residual stresses at the notch root during variation of stresses. It is believed that by these tests it is possible to simulate the fatigue behavior of welded joints. Suggested equivalent stress was used to correlate the fatigue lives for the variable amplitude histories.