Fretting fatigue crack initiation lifetime predictor tool: Using damage mechanics approach

Prediction of fretting fatigue crack initiation in double lap bolted joint using Continuum Damage Mechanics

“…Based on Hojjati & Wahab [24], the crack is expected to nucleate in the zone of maximum equivalent multi-18 axial damage stress ߪ * . The distribution of ߪ * at contact interface is depicted in Figure 24.…”

“…Fretting is a small oscillatory motion between two contact surfaces, which may cause wear or fatigue 24 damage. Both wear volume and fatigue lifetimes are functions of slip amplitude.…”

“…introduced damage variable is defined as the effective surface of micro-cracks that intersect with a plane. 24 When the accumulated damage reaches a critical value, micro-cracks initiation will start. Further increase of 25 degradation and loose of material continuity will induce the failure of the material.…”

“…During fretting 23 fatigue test the specimen was fixed by the lower grips. The contact stress was applied by tightening the bolt 24 after the application of the clamping force. The cyclic axial load was applied by the upper gripper.…”

Three-dimensional constitutive model for structural and functional fatigue of shape memory alloy actuators

“…Based on this damage variable, constitutive equations have been developed to predict the deterioration of material properties (Voyiadjis and Kattan, 1999). CDM enables fatigue life prediction in innovative superalloys (Shi et al, 2013) and standard aluminium alloys (Hojjati-Talemi and Wahab, 2013) alike.…”