The characterization of Vicker`s microhardness indentations and pile-up profiles as a strain-hardening microprobe

Santos, Carlos Vinícius de Paes; Odette, G.R.; Lucas, G.E.; Schroeter, B.; Klinginsmith, D.; Yamamoto, Takashi

doi:10.2172/595663

Cited by 1 publication

(4 citation statements)

References 1 publication

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“…Top two curves represent impact with bigger rock (M = 0.175 kg) and bottom two curves present impact with smaller rock (M = 0.105 kg). It was shown by numerous experiments and simulations that the ratio of height-to-width of the pile-up area, h p /L p , is an exponential function of strain hardening exponent, n, [20]. From this source the width of the pile-up, L p , can be estimated as L p = 83h p for Steel_1 and L p = 50h p for Steel_2.…”

Section: Definition Of Pile-up Profilementioning

confidence: 99%

“…The predictions made using Equation (20) for friction f = 0.9 are presented graphically in Figure 8 for two chosen steels at three different locations of impact with the rock.…”

Section: Calculation Of Scratch Length Lmentioning

confidence: 99%

“…The height of pile-up, which forms during indentation depends on penetration depth, friction, yield stress and strain hardening exponent as shown by Santos in [20]. Analysis of these data allows us to make an assumption that pile-up height can be described by the following analytical expression, obtained by fitting the experimental data presented in [20] as suggested by Hu et.al. in [21]: where constant C 0 depends on friction and depth of penetration [21].…”

Section: Analytical Modelling Of Plastic Deformation During Impactmentioning

confidence: 99%

“…It was shown by numerous experiments and simulations that the ratio of height-to-width of the pile-up area, , is an exponential function of strain hardening exponent, n , [20]. From this source the width of the pile-up, L p , can be estimated as for Steel_1 and for Steel_2.…”

Section: Analytical Modelling Of Plastic Deformation During Impactmentioning

confidence: 99%

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The influence of strain hardening on steel erosion wear studied by analytical modelling of impeller testing

Lapovok

Barnett

2019

Tribology - Materials, Surfaces & Interfaces

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Abrasive wear of steel is a common problem in the mining industry. It was tackled by many researches using analytical and numerical approaches. Despite the advantages of the analytical models to provide quick and elegant solutions, they were derived using several assumptions limiting their applicability, such as e.g. rigid-plastic flow. However, the consideration of strain hardening during impact is crucial to depict a real behaviour of tool material, which changes its mechanical properties during collision. In this research, a new analytical model is invented describing the impact of steel plate with a solid rock, while the material of the steel plate is hardening during penetration and scratching. The model provides a frame of analytical equations based on the second Newton law and equations of motion in vertical and horizontal directions. The motion in vertical direction is considered as an indentation problem and the motion in the horizontal direction as a scratch problem. This model incorporates the most general Holloman representation of strain-hardening law to capture the relationship between microstructural characteristics of steels and wear resistance. It was shown that the indentation depth, the pile-up height, length of the scratch and erosion ratio directly dependant on the strain-hardening parameters in Holloman equation. The model predicts the maximum indentation depth and scratch length as a function of strength coefficient and strain hardening exponent, but also of impact angle, mass of the rock, position of impact at the surface of steel plate and coefficient of friction during metal movement. The model was tested qualitatively by comparison with impeller-tumbler experiments using different steel plates. The solution obtained from this model could be used for quick and easy evaluation of the steel for mining tools in an industrial environment.

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Section: Definition Of Pile-up Profilementioning

confidence: 99%

“…The predictions made using Equation (20) for friction f = 0.9 are presented graphically in Figure 8 for two chosen steels at three different locations of impact with the rock.…”

Section: Calculation Of Scratch Length Lmentioning

confidence: 99%

Section: Analytical Modelling Of Plastic Deformation During Impactmentioning

confidence: 99%

Section: Analytical Modelling Of Plastic Deformation During Impactmentioning

confidence: 99%

See 2 more Smart Citations

The influence of strain hardening on steel erosion wear studied by analytical modelling of impeller testing

Lapovok

Barnett

2019

Tribology - Materials, Surfaces & Interfaces

View full text Add to dashboard Cite

show abstract

The characterization of Vicker`s microhardness indentations and pile-up profiles as a strain-hardening microprobe

Cited by 1 publication

References 1 publication

The influence of strain hardening on steel erosion wear studied by analytical modelling of impeller testing

The influence of strain hardening on steel erosion wear studied by analytical modelling of impeller testing

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