Open AccessThe evaluation of fatigue strength based on characteristic length
Author(s) -
Shanqin Hou,
Xi Guang Gao
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/780/7/072018
Subject(s) - fatigue limit , gravitational singularity , goodman relation , stress concentration , stress (linguistics) , materials science , singularity , fatigue testing , structural engineering , strength of materials , mathematics , composite material , mathematical analysis , fracture mechanics , engineering , linguistics , philosophy
Different approaches are used to evaluate fatigue behaviors according to the geometric shape and size of defects in material, though it is well known that the fatigue properties of a material are intrinsic, and should be independent of geometric shape and size. By introducing the concept of fatigue characteristic length, the failure of material occurs when equivalent stress amplitude within characteristic length reach to fatigue strength of smooth material. Using this method, fatigue behaviours of material, no matter with or without stress concentration or singularities, can be evaluated in the same way. It also can explain the “size effect” of small defects on fatigue problem. Considering the fatigue failure of material within characteristic length, the evaluation of fatigue strength for problems with stress concentration or singularity has been studied by experiment.