A.K. Vasudevan

TL;DR: In this paper, it is shown that the overload effects and other transient effects arise due to perturbation of the stresses ahead of the crack tip, and these can be accounted for by the two parametric approach emphasized in the unified theory.

TL;DR: In this paper, the authors developed an approach with two driving force parameters to analyze the fatigue behavior and found that the internal stress is the missing link that can bridge the gap between the four main stages of damage.

TL;DR: In this article, a unified approach was developed to consider interplay of these two governing forces, Δ K and K max, as fundamental to fatigue, since K max is the governing parameter for these effects.

TL;DR: In this paper, the authors examined the crack growth behavior of structural steels by using the Unified Approach developed by the authors in this approach, fatigue requires two load parameters involving maximum stress intensity, Kmax, and stress intensity amplitude, △K For a fatigue crack to grow, both Kmax and △ K must exceed their respective threshold values Similarly, for any other crack growth rate, two limiting values, KMAX∗ and K�K∗ are required to enforce the growth rate The variation of these two critical values forms the crack trajectory map, which is defined by plotting

TL;DR: In this paper, it is shown that the internal stresses decrease as a short crack grows out of the existing stress field, and the role of residual stresses and transformation induced internal stresses on the crack growth is discussed.