Micro-mechanical studies on the effect of the stress triaxiality and the Lode parameter on ductile damage

Micro‐mechanical studies on the effect of various stress‐states on ductile damage and failure

“…Therfefore additional series of numerical simulations on the micro-scale have been performed to cover a wide range of stress triaxialities η and Lode parameters ω. Unit cell calculations with one spherical void and the inital porosity of 3% are used to propose functions for the parametersᾱ,β andδ as a function of the stress triaxiality η and the Lode parameter ω [6]. Furthermore, additional series of simulations have been performed to detect the influence of different void sizes, void shapes and void distributions on the parameters appearing in the damage condition (3) and the damage rule (4).…”

Three‐dimensional cell model analysis of ductile damage under dynamic loading condition

“…Hence, further studies to identify critical pore distributions and to identify the corresponding failure processes are necessary. Furthermore it can be noted that a straight forward approach from static loading [7] to dynamic loading is not possible. Especially the definition of the appropriate boundary conditions, the controlled generation of stress states, which will become even more critical for three-dimensional loading, and the definition of a micro-fracture criterion will need special attention.…”

“…To overcome these experimental difficulties, frequently micro-mechanical simulations with void containing cells are used to study the damage behavior under general loading conditions [5,6]. Micro-mechanical simulations under static loading conditions have been successfully used to gain additional information with respect the ongoing damage processes [7] while under dynamic loading conditions only two-dimensional studies have been presented [8].…”

Load Bearing Capacity of a Dented Aluminum Pipe Subjected to Internal Pressure Considering the Effect of Ductile Damage

“…The model developed by Brünig et al (2014) is constructed on the basis of three parameters namely, the stress intensity, the stress triaxiality and the Lode parameter. Several threedimensional micro-mechanical numerical analyses are performed for covering a wide range of stress triaxialities and Lode parameters in tension, shear and compression domains (Brünig et al, 2013). Also the effect of stress triaxiality on the inelastic deformation behavior of aluminum alloys for smooth and pre-notched tensile and shear specimens were studied experimentally and numerically by Brünig et al (2011).…”