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CYCLIC STRESS‐STRAIN, STRESS‐TEMPERATURE AND STRESS‐ELECTRICAL RESISTANCE RESPONSE OF NiCuMo ALLOYED SINTERED STEEL
Author(s) -
Biallas G.,
Piotrowski A.,
Eifler D.
Publication year - 1995
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1995.tb01421.x
Subject(s) - materials science , stress (linguistics) , metallurgy , composite material , electrical resistance and conductance , strain (injury) , stress–strain curve , deformation (meteorology) , philosophy , linguistics , medicine
—The influence of sintering temperature on the fatigue behaviour of a NiCuMo alloy was determined. It is common practice to characterize the cyclic deformation behaviour by means of plastic strain amplitudes. For sintered materials the quantity of the plastic strain amplitudes is influenced by microstructural changes as well as crack opening and crack growth effects and does not allow any distinction between these mechanisms. In the present work cyclic stress‐strain, cyclic stress‐temperature and cyclic stress‐electrical resistance measurements were studied simultaneously to get a more comprehensive description of the fatigue behaviour of sintered steels. The temperature is essentially sensitive to the work of plastic deformation during cyclic loading. The electrical resistance responds to microstructural changes, e.g. dislocation rearrangements and void formation as well as to crack initiation and propagation. Beyond that it is shown that continuous stress‐increase tests are a suitable short term testing method to determine cyclic stress‐strain curves which are in a very good agreement with those from single step tests.