Fatigue crack growth of Al 5083-H111 subjected to mixed-mode loading

Abstract

Fatigue is a major cause of failure in several industries, and in many practical cases, local mixed-mode conditions prevail at the crack front. The effect of plane mode mixity on the crack growth rate and crack growth direction has been investigated. Fatigue crack growth experiments have been conducted on aluminum alloy Al5083-H111 for several mode mixities. A fixture was manufactured in order to apply the different combinations of mode I and II by changing loading angle. Afterward, threedimensional simulations have been implemented using the Zencrack software. Based on numerical simulations, new relations are proposed to estimate stress intensity factors for compact tension shear geometry by modifying Richard's equations [1].

A model for modifying the S‐N curve considering the effect of boundary conditions on the fatigue crack growth of welded components

“…The maximum energy release rate is used as the criterion for predicting the crack growth direction. Then, the energy release rate is calculated in each node on the crack front, and the maximum value of the energy release rate and its growth direction are extracted, and thereafter, the amount of growth is determined, and the crack front is updated 27 . Due to potential variations in the growth increment among different nodes on the crack front, a curved crack front with a thumbnail shape may ensue 23 …”

“…Then, the energy release rate is calculated in each node on the crack front, and the maximum value of the energy release rate and its growth direction are extracted, and thereafter, the amount of growth is determined, and the crack front is updated. 27 Due to potential variations in the growth increment among different nodes on the crack front, a curved crack front with a thumbnail shape may ensue. 23 To apply the BCs to the specimen, as shown in Figure 2A, RPs are placed at the center of surfaces on both sides of the beam.…”

Plastic Zone Radius Criteria for Crack Propagation Angle Evaluated with Experimentally Obtained Displacement Fields

“…This means that a crack grows under fatigue loading if ∆Keq exceeds the fatigue threshold (∆Kth), or the crack grows under static loading when the equivalent SIF (Keq) exceeds the fracture toughness (Kc), as has been postulated before [16]. Finally, we can say that SENT samples have gained popularity in testing pipelines [18] and welds or offer less restriction [6,19], and C(T) samples offer a larger space to observe CP evolution [20][21][22]. Lately, some researchers have devoted efforts to evaluating CP in complex problems using artificial intelligence, such as heterogeneous materials [7], metamaterials [23], or composites [24].…”