PhyBaLCHT – Influence of indentation force on the results of cyclic hardness tests and investigations of comparability to uniaxial fatigue loading

Blinn, Bastian; Görzen, David; Klein, Marcus; Eifler, Dietmar; Beck, Tilmann

doi:10.1016/j.ijfatigue.2018.09.025

Cited by 27 publications

(45 citation statements)

References 30 publications

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“…The results of the PHYBAL CHT method, which induces multiaxial compressive loadings, was proven to show a good correlation with uniaxial compression fatigue tests. This confirms that the hardening-exponent CHT (e II ) obtained from PHYBAL CHT can be compared with the cyclic hardening behavior of materials in uniaxial fatigue loading conditions [12]. Further studies by Bambach et al [14] have demonstrated a successful application of the PHYBAL CHT (e.g., to determine optimized heat treatment conditions of high strength steel for maximum damage tolerance during fatigue loadings).…”

Section: Materials and Experimental Methodssupporting

confidence: 56%

“…where ha,pII is the half-width of the hysteresis after the sixth indentation cycle, aII is the coefficient of the ha,p,II -N curve, N is the number of indentation cycle, and eII is the hardening-exponent. According to [11,12], the ha,p-N relation (green line in Figure 2b) was described by dividing it into two sections. Up to the fourth cycle, where the slope of the ha,p-N was not constant, the hysteresis width of the cyclic indentation was described by adding up the two power-law functions ha,pI (dark The specimen was prepared by mechanical polishing up to 4000 grid SiC grinding paper at 350 RPM using water as a lubricating agent.…”

Section: Description Valuementioning

confidence: 99%

Section: Description Valuementioning

confidence: 99%

“…According to [11,12], the ha,p-N relation (green line in Figure 2b) was described by dividing it into two sections. Up to the fourth cycle, where the slope of the ha,p-N was not constant, the hysteresis width of the cyclic indentation was described by adding up the two power-law functions ha,pI (dark [11,12], with permission from Elsevier, 2019.…”

Section: Description Valuementioning

confidence: 99%

“…In this paper, we compare experimental data obtained during cyclic indentation with atomistic simulations. The evaluation of the cyclic indentation results employed in this work is based on PHYBAL CHT [11,12], which is described further in Section 2. In order to increase the comparability, we used the same method to analyze the outcome of the simulation and experiment.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Indentation of Iron: A Comparison of Experimental and Atomistic Simulations

Deldar

Alhafez

Smaga

et al. 2019

Metals

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Cyclic indentation is a technique used to characterize materials by indenting repeatedly on the same location. This technique allows information to be obtained on how the plastic material response changes under repeated loading. We explore the processes underlying this technique using a combined experimental and simulative approach. We focus on the loading–unloading hysteresis and the dependence of the hysteresis width ha,p on the cycle number. In both approaches, we obtain a power-law demonstrating ha,p with respect to the hardening exponent e. A detailed analysis of the atomistic simulation results shows that changes in the dislocation network under repeated indentation are responsible for this behavior.

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Section: Materials and Experimental Methodssupporting

confidence: 56%

Section: Description Valuementioning

confidence: 99%

Section: Description Valuementioning

confidence: 99%

Section: Description Valuementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cyclic Indentation of Iron: A Comparison of Experimental and Atomistic Simulations

Deldar

Alhafez

Smaga

et al. 2019

Metals

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Cyclic Nanoindentation for Local High Cycle Fatigue Investigations: A Methodological Approach Accounting for Thermal Drift

et al. 2023

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Cyclic nanoindentation allows characterizing the influence of single phases and their interactions on fatigue mechanisms. Herein, a method for high cycle fatigue testing by nanoindentation is presented. By combining high‐ and low‐frequency indentation modes, high cycle numbers are achieved while obtaining sufficient data points to reconstruct force–displacement hysteresis loops. A challenge is the stochastic course of thermal drift which is addressed by measuring drift rate in regular low‐force holding segments. Drift rates are used to correct the displacement values, yielding reproducible cyclic deformation data as it is shown for two very different materials, a ductile metal and a brittle ceramic.

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Improving the Defect Tolerance and Fatigue Strength of AM AlSi10Mg

2023

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Additively manufactured structures reveal a poor surface quality and a high number of process‐induced defects in the surface‐near area, leading to a significant reduction of the fatigue strength. As laser‐based powder bed fusion (PBF‐LB) processes are used to produce topologically optimized lightweight structures with complex geometries, which cannot be fully machined, the influence of the process‐induced surface on the fatigue behavior needs to be analyzed. For this, also the interrelation of the surface‐induced notch effects with the surrounding material volume must be considered. As thermal treatments can also be applied to filigree components with complex geometries, in the presented work the influence of different heat treatments, i.e., stress relief annealing (SR) and artificial aging (T6), on the material properties, especially the defect tolerance, of AlSi10Mg manufactured via PBF‐LB is analyzed. Both heat treatments lead to a dissolution of the cellular Si‐rich network, resulting in decreased hardness and tensile strength, but higher fatigue strength. The increased fatigue strength results from a reduction of the process‐induced residual stresses, but mainly a strongly improved defect tolerance. Consequently, to evaluate the fatigue strength of additively manufactured materials, besides the materials strength and the process‐induced defects, also the defect tolerance must be considered.

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PhyBaLCHT – Influence of indentation force on the results of cyclic hardness tests and investigations of comparability to uniaxial fatigue loading

Cited by 27 publications

References 30 publications

Cyclic Indentation of Iron: A Comparison of Experimental and Atomistic Simulations

Cyclic Indentation of Iron: A Comparison of Experimental and Atomistic Simulations

Cyclic Nanoindentation for Local High Cycle Fatigue Investigations: A Methodological Approach Accounting for Thermal Drift

Improving the Defect Tolerance and Fatigue Strength of AM AlSi10Mg

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