Exact(5)
Maximum stress applied over the laminate during the fatigue cycle is.
TS is the maximum stress applied to specified part of films without tearing.
It has been determined that the increase in yield stress with the cyclic ratio (D) is more significant as the maximum stress applied to the material increases.
The maximum stress applied on the specimen was 85% of its compressive strength and the stress ratio was kept constant as 0.3.
A good empirical correlation was found between the material residual strength and the total event counts detected at maximum stress applied during pre-fatiguing cycles.
Similar(55)
Also, this parameter progressively increased to levels well exceeding the maximum normal stress applied to the clay.
But the manner of the fatigue crack initiation and propagation depends on the maximum cyclic stress applied.
It has been shown that during testing in air, the fatigue gain ranges between ~ 540 and 4300%, depending on the maximum alternating stress applied to the material.
In this paper, numerical three-dimensional analysis of the maximum shear stress applied into the coated film and substrate under a single EHL operating condition was performed with a range of coated film thickness and elastic properties.
The fractographic analysis of the specimens indicates that the final fatigue fracture could be due either to the joint action of a large number of cracks, which propagate from the substrate coating interface, or to a single dominant fatigue crack, depending on the maximum alternating stress applied to the coated system.
Thus, it has been shown that, depending on the maximum alternating stress applied to the material, the fatigue life of the steel can be increased between 400 and 2119%, whereas the fatigue limit was observed to increase by 22%, that is to say, 60 MPa above the fatigue limit of the uncoated substrate, which in the present work was found to be of approximately 381 MPa.
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