Complex sentence: For example, Yu and Harris's fatigue life model for ball bearings, which relates the fatigue life of a bearing to the induced stress, Paris and Erdogan's crack growth model and stochastic defect-propagation model (REF) are other examples of micro-level models.
Split into simpler sentences: For example, Yu and Harris's fatigue life model for ball bearings, which relates the fatigue life of a bearing to the induced stress. Paris-Erdogan's crack growth model and stochastic defect-propagation model (REF) are other examples of micro-level models.