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Simulation of the process of metal hardness measurement by the rockwell method

Berczyński S., Grochała D., Grządziel Z.

New Trends in Production Engineering

2018

Vol. 1, Iss. 1

647-654

The article presents a simulation of metal hardness determination by the Rockwell method. The authors describe a physical model of an indenter and the examined sample built by means of the Nastran FX 2010 program using the finite elements method. The modelling included subsequent stages of indenter loads that follow the procedure used in the method. The verifying calculations were made for the results of C45 steel hardness of approx. 20 HRC. Two methods of hardness measurements were analyzed. A diamond cone was used as an indenting tool in one method, a steel ball in the other. As a result of calculations, spatial maps of elastic and plastic strains and stresses were obtained throughout the process. The hardness results obtained from computer simulations and those from experiments involving C45 steel are similar. metal hardness, Rockwell method, finite elements method, Nastran FX 2010, elastic strains twardość metalu, metoda Rockwella, metoda elementów skończonych, Nastran FX 2010, odkształcenia sprężyste

Prevention of Elastic Strains in Flexible Large Size Machine Parts with the Use of Elastic Support

Nozdrzykowski K.

Machine Dynamics Research

2015

Vol. 39, No. 2

111-122

In the article, a new method of elastic support of long, heavy and flexible machine parts is presented. The proposed method of support enables prevention of elastic strains in machine parts that occur under their own weight. A support force analysis for marine engine extra-large crankshafts is presented.

Obszary plastyczne i sprężyste w ciągnionych pełnych profilach okrągłych.

Knych T.

Rudy i Metale Nieżelazne

2002

R. 47, nr 12

643-644

Interpretation of slip behaviour adjacent to (alpha/gamma) phase interfaces at the onset of yielding.

Ryś J.

Inżynieria Materiałowa

1998

R. XIX, nr 3

209-214

The compatibility requirement of elastic and plastic strains across the phase interfaces, in the (alpha/gamma) duplex steel bicrystals, results in the occurence of additional internally induced stresses, so-called incompatibility stresses. Structural effects observed along the (alpha/gamma) phase interfaces are due to the incompatibility stresses, which arise from elastic anisotropy and asymetry of plastic flow in component crystals as well as the stress relaxation from dislocation pile-ups in adjacent crystals and the stress distribution in the vicinity of the interfaces.