Cyclic hardness test PHYBAL sub(CHT) - Short-time procedure to evaluate fatigue properties of metallic materials

• Published in: International journal of fatigue Vol. 63; pp. 78 - 84
• Main Authors: Kramer, Hendrik S, Starke, Peter, Klein, Marcus, Eifler, Dietmar
• Format: Journal Article
• Language: English
• Published: 01-01-2014
• Subjects: Amplitudes; Analogies; Fatigue (materials); Hardness; Hardness tests; Hysteresis loops; Indentation; Plastic strain
• ISSN: 0142-1123
• DOI: 10.1016/j.ijfatigue.2014.01.009

The evaluation of fatigue properties of metallic materials with conventional methods requires time and cost consuming experiments. That is why a new short-time procedure named PHYBAL sub(CHT) was developed at the Institute of Materials Science and Engineering at the University of Kaiserslautern. This method requires only a planar material surface to perform cyclic force-controlled hardness indentation tests. To characterize fatigue properties of metallic materials the change of the force-indentation-depth-hysteresis has to be plotted versus the number of indentation cycles (N). In analogy to the plastic strain amplitude which is used to characterize the cyclic deformation behavior the indentation-depth width of the hysteresis loop is specified as plastic indentation-depth amplitude (h sub(a).p This parameter is well suited to characterize fatigue properties of metallic materials.