The fatigue load, stress ratio
and the calculation results under different stress level are shown in Table 4.
In sample of 377 adults, high to low level of stress ratio
was 52% to 48%.
To implement all fatigue tests, a fatigue testing machine of sort (AVERY 7305) plane bending was utilized, with a constant amplitude, plane bending fatigue tests were performed at room temperature (25[degrees]C) under stress ratio
(R = -1).
Figure 12 shows that the shear stress and normal stress ratio
change law of the measuring points A and B are different; the ratio of measuring point B is a "single peak" distribution state, and the measuring point A ratio change law is "wave" distribution state.
This model was transformed into an all-strain based space by involving the stress ratio
and the ratio of in-plane principal strain increments.
Effect of consolidation stress ratio
on dynamic strength and dynamic pore water pressure of soil.
where U is a function of the stress ratio
R and Newman's crack opening function f and is expressed as
eff]/[DELTA]K) parameter which was assumed as a linear function of stress ratio
, R, independent of [K.
The stress ratio
is defined as [delta] = [sigma]/[[sigma].
CSR###Cyclic stress ratio
generated by earthquake###Depth below ground surface in meters
For exampleWanatowski and Chu (2007) depict a relation between the stress ratio
A numerical analysis of reinforced concrete columns subjected to high-cycle fatigue loading has shown that the resistant number of cycles, next to well established parameters such as maximum stress level, stress ratio
and loading frequency, is greatly affected by reinforcement ratio.