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Cracking simulation‐based cumulative fatigue damage assessment
Author(s) -
Farag Mahmoud M.,
ElKady Ramy M.,
Hammouda Mohammad M. I.
Publication year - 2021
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.13487
Subject(s) - materials science , cracking , pearlite , fracture (geology) , ferrite (magnet) , structural engineering , circumference , carbon steel , amplitude , composite material , surface roughness , fracture mechanics , microstructure , corrosion , austenite , engineering , mathematics , geometry , physics , quantum mechanics
The present work is an extension of a previously developed fracture mechanics cracking damage model and highlights the ability of that model to predict the fatigue lifetime of un‐notched round specimens made of a ferrite–pearlite 0.4C‐70/30 carbon steel in the cases of (a) two‐step fully reversed axial loading with low‐to‐high and high‐to‐low sequences and (b) repeated application of fully reversed two‐step axial loading blocks. This model numerically simulates the collective behavior of growing short fatigue cracks originating from the specimen surface. The surface roughness is assumed to resemble microcracks of different sizes and locations along the minimum specimen circumference. Material grains of different phases, sizes, and strengths are randomly distributed over that circumference. Possible activities of surface cracks are predicted against loading cycles till a fracture occurs. Published experimental data on ferritic‐pearlitic steel specimens in fully reversed variable amplitude loading are utilized. Different specimen tests are randomly configured and simulated. The present predictions are in fair agreement with the corresponding experimental results.