Biaxial fatigue behavior of an epoxy polymer with mean stress effect

✍ Scribed by Gang Tao; Zihui Xia

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 558 KB
• Volume: 31
• Category: Article
• ISSN: 0142-1123
• DOI: 10.1016/j.ijfatigue.2008.03.025

✦ Synopsis

Biaxial fatigue behavior of an epoxy polymer was investigated under cyclic shear and proportional axialshear combined loadings with mean strains. Axial and shear strains were simultaneously measured by a non-contact real-time strain measurement system during fatigue process. Then the mechanical parameters (stress/strain components, mean stress/strain, strain energy densities, etc.) of the specimens during entire fatigue life were able to be quantitatively retrieved from the recorded stress-strain data. Multiaxial fatigue life prediction models were established upon stress-, strain-and energy-based approaches with consideration of mean stress/strain effect, where better agreement was achieved in stress-based and energy-based approaches.