Influence of Different Micro-Imprints to Fatigue Life of Components

Tomažinčič, Dejan; Sedlaček, Marko; Podgornik, Bojan; Klemenc, Jernej

doi:10.1520/mpc20160024

Cited by 5 publications

(5 citation statements)

References 13 publications

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“…There are several different approaches when dealing with notch effects [ 15 , 16 , 17 ] and estimating durability curves, taking crack growth into account [ 18 ]. We used the critical plane approach [ 19 ] of a dynamically loaded sample. The advantage of Method B is that after the C–M curve level has been lowered, a conventional procedure can be used to estimate the fatigue life of a porous structure by calculating the extent of damage achieved based on a simulation of the stabilised load cycle.…”

Section: Methodsmentioning

confidence: 99%

Estimate of Coffin–Manson Curve Shift for the Porous Alloy AlSi9Cu3 Based on Numerical Simulations of a Porous Material Carried Out by Using the Taguchi Array

Tomažinčič

Klemenc

2022

Materials

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In real engineering applications, machine parts are rarely completely homogeneous; in most cases, there are at least some minor notch effects or even more extensive inhomogeneities, which cause critical local stress concentrations from which fatigue fractures develop. In the present research, a shift of the Coffin–Manson εa–N material curve in a structure with random porosity subjected to dynamic LCF loads was studied. This allows the rest of the fatigue life prediction process to remain the same as if it were a homogeneous material. Apart from the cyclic σ–ε curve, which is relatively easy to obtain experimentally, the εa–N curve is the second most important curve to describe the correlation between the fatigue life N and the strain level εa. Therefore, the correct shift of the εa–N curve of the homogeneous material to a position corresponding to the porous state of the material is crucial. We have found that the curve shift can be efficiently performed on the basis of numerical simulations of a combination of five porosity-specific geometric influences and the associated regression analysis. To model the modified synthetic εa–N curve, five geometric influences of porosity by X-ray or μ-CT analysis are quantified, and then the porosity-adjusted coefficients of the Coffin–Manson equation are calculated. The proposed approach has been successfully applied to standard specimens with different porosity topography.

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Section: Methodsmentioning

confidence: 99%

Estimate of Coffin–Manson Curve Shift for the Porous Alloy AlSi9Cu3 Based on Numerical Simulations of a Porous Material Carried Out by Using the Taguchi Array

Tomažinčič

Klemenc

2022

Materials

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“…The plate specimens (20x20x8 mm) for the tribological tests had a spacing between dimples of 500µm, which corresponds to the area density of 1.1 %. The depth of the dimples was limited by the dynamic fatigue properties since higher depths drastically influence the fatigue life [30]. Tribology in Manufacturing Processes and Joining by Plastic Deformation II In order to investigate the influence of surface texturing sequence samples were textured before or after hard coating deposition.…”

Section: Methodsmentioning

confidence: 99%

Influence of Surface Texturing Sequence on Fatigue Life and Tribological Properties of Coated Tool Steel

Sedlaček

Podgornik

Česnik³

2018

KEM

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The aim of this study was to investigate the influence of laser surface texturing on fatigue life and tribological properties. Textures were introduced before and after hard TiAlN coating deposition in order to investigate the sequence of surface texturing process. It was found that the sequence of surface texturing has an effect on tribological and fatigue life behaviour. If laser texturing is done after coating deposition, friction is lower because of the better wettability of steel in comparison with coating, but suffers in fatigue life properties.

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“…Finally, this numerical result can be applied to numerically estimate the fatigue life Ni of the specimen by considering the Coffin-Manson curve of the homogeneous material-see Figure 9c. Numerical simulations were carried out for the most critical part of the specimen (i.e., its thinnest part to which the extensometer was mounted-see Figure 9d) using the Abaqus-Standard (implicit) analysis [33]. The exact nominal strains in this part were known from the experiments.…”

Section: Experimental-numerical Approach For Analysing the Fatigue Lifementioning

confidence: 99%

Predicting the Fatigue Life of an AlSi9Cu3 Porous Alloy Using a Vector-Segmentation Technique for a Geometric Parameterisation of the Macro Pores

Tomažinčič

Virk

Kink

et al. 2020

Metals

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Most of the published research work related to the fatigue life of porous, high-pressure, die-cast structures is limited to a consideration of individual isolated pores. The focus of this article is on calculating the fatigue life of high-pressure, die-cast, AlSi9Cu3 parts with many clustered macro pores. The core of the presented methodology is a geometric parameterisation of the pores using a vector-segmentation technique. The input for the vector segmentation is a μ-CT scan of the porous material. After the pores are localised, they are parameterised as 3D ellipsoids with the corresponding orientations in the Euclidian space. The extracted ellipsoids together with the outer contour are then used to build a finite-element mesh of the porous structure. The stress–strain distribution is calculated using Abaqus and the fatigue life is predicted using SIMULIA fe-safe. The numerical results are compared to the experimentally determined fatigue lives to prove the applicability of the proposed approach. The outcome of this research is a usable tool for estimating the limiting quantity of a structure’s porosity that still allows for the functional performance and required durability of a product.

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Influence of Different Micro-Imprints to Fatigue Life of Components

Cited by 5 publications

References 13 publications

Estimate of Coffin–Manson Curve Shift for the Porous Alloy AlSi9Cu3 Based on Numerical Simulations of a Porous Material Carried Out by Using the Taguchi Array

Estimate of Coffin–Manson Curve Shift for the Porous Alloy AlSi9Cu3 Based on Numerical Simulations of a Porous Material Carried Out by Using the Taguchi Array

Influence of Surface Texturing Sequence on Fatigue Life and Tribological Properties of Coated Tool Steel

Predicting the Fatigue Life of an AlSi9Cu3 Porous Alloy Using a Vector-Segmentation Technique for a Geometric Parameterisation of the Macro Pores

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