Ultra-Low Cycle Fatigue Life Prediction Model—A Review

Abstract

This article is a review of models for predicting ultra-low cycle fatigue life. In the article, the life prediction models are divided into three types: (1) microscopic ductile fracture models based on cavity growth and cavity merger; (2) fracture models based on porous plasticity; and (3) ductile fracture models based on continuum damage mechanics. Furthermore, the article provides a critical assessment of the current state of research on ultra-low cycle fatigue life prediction models, highlighting the limitations and challenges faced by each model type. Ultimately, this review aims to provide a comprehensive overview of the different models available for predicting ultra-low cycle fatigue life and to guide future research in this important area of materials science and engineering.

The Simulation of Extremely Low Cycle Fatigue Fracture Behavior for Pipeline Steel (X70) Based on Continuum Damage Model

“…However, with the exploitation of oil and gas expanding into seismic and permafrost regions, pipelines are more vulnerable to cyclic loads with a large strain amplitude [15][16][17]. Under such conditions, pipes may undergo large plastic deformation and fail in extremely Metals 2023, 13, 1238 2 of 16 low cycles (N f < 100), which is also called extremely low cycle fatigue (ELCF) [18][19][20][21]. The fracture behavior of the ELCF shows significant difference to that of general LCF.…”