Near tip strain evolution under cyclic loading
Journal Title: Frattura ed Integrità Strutturale - Year 2013, Vol 7, Issue 25
Abstract
The concept of ratchetting strain as a crack driving force in controlling crack growth has previously been explored at Portsmouth using numerical approaches for nickel-based superalloys. In this paper, we report the first experimental observations of the near-tip strain evolution as captured by the Digital Image Correlation (DIC) technique on a compact tension specimen of stainless steel 316L. The evolution of the near-tip strains with loading cycles was studied whilst the crack tip was maintained stationary. The strains were monitored over the selected distances from the crack tip for a given number of cycles under an incremental loading regime. The results show that strain ratchetting does occur with load cycling, and is particularly evident close to the crack tip and under higher loads. A finite element model has been developed to simulate the experiments and the simulation results are compared with the DIC measurements.
Authors and Affiliations
J. Tong, Y. -W Lu, B. Lin, Y. H. Tai, J. R. Yates
Keywords
Related Articles
- EP ID EP120301
- DOI 10.3221/IGF-ESIS.25.07
- Views 75
- Downloads 0
Crack path predictions and experiments in plane structures considering anisotropic properties and material interfaces
In many engineering applications special requirements are directed to a material's fracture behavior and the prediction of crack paths. Especially if the material exhibits anisotropic elastic properties or fractur...
Development of biodegradable magnesium alloy stents with coating
Biodegradable stents are attracting the attention of many researchers in biomedical and materialsresearch fields since they can absolve their specific function for the expected period of time and then graduallydisa...
La modellazione microstrutturale di materiali a struttura eterogenea: princìpi ed applicazioni
Molti problemi della Meccanica e Fisica dei Solidi e della Scienza dei Materiali, non sono facilmente risolvibili con gli approcci tradizionali. Oltre allo studio delle proprietà effettive dei solidi eterogenei, vi è la...
Use of a gray level co-occurrence matrix to characterize duplex stainless steel phases microstructure
Duplex stainless steels are widely used in industry. This is due to their higher strength compared to austenitic steels and to their higher toughness than ferritic steels. They also have good weldability and high resista...
Some experimental observations of crack-tip mechanics with displacement data
In the past two decades, crack-tip mechanics has been increasingly studied with full-field techniques. Within these techniques, Digital Image Correlation (DIC) has been most widely used due to its many advantages...