Experimental Research Regarding the evolution of Some parameters of the Superficial Layer in love Cycle Fatigue Process
Abstract
The development of some mechanic engineering systems in, feasible to pressure
vessels, aeronautics, ship building technology, requires a full investigation of
the material features that are to be examined under a low cycles fatigue to strains
close to the limit of the material elasticity. In this paper we present a testing machine
at variable stresses in oligocyclic range. An own testing stand was patented
by Romanian Standard Office, some results concerning the evolution of inner second
order tensions, microhardness in superficial layer during low cycles fatigue
process and the microscopic images of cracks, some results concerning the evolution
of the crystalline lattice parameter, level of the texture were realised in steps of
each two thousand cycles until a limit of 104 cycles. Two types of steel are tested.
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- 2007 fascicula9 nr2 [28]