Determining Effective Length for 40 HM-T Steel by Use of Non-Local Line Method Concept

Abstract

In the paper, the concept of non-local line method is presented and used for determining the effective length for notched elements. Experimental tests and calculations were performed for 40 HM-T (42CrMo4+QT) steel made specimens of two types, i.e. smooth specimens, and notched specimens with notch radius equal to 0.2 mm, 0.5 mm, 0.8 mm, and 1 mm. The performed FEM calculations took into account the multi-linear hardening model and cyclic material properties. The concept of the presented non-local line method bases on finding the position of critical plane and determining the effective length, meant as the fracture process zone. During numerical stress gradient simulations, also the weight function was implemented. It was observed that the effective length increases as the load increases.

The Development of Fatigue Cracks in Metals

“…5b The length of the crack versus the number of cycles is used to describe the fatigue cracks growth. Depending on the applied load or occurring notches [18], the growth of cracks may have a different lifetime. Fig.…”

Comparative Analysis of Fatigue Energy Characteristics of S355J2 Steel Subjected to Multi-Axis Loads

“…The fatigue properties of construction materials under uniaxial loads are best described in the literature [7][8][9]. However, due to the fact that in reality complex loading states occur in machines and structures, it is more desirable to test the complex state of loading complexity [10][11][12].…”