The aim of the study will be to determine the effects of stress ratio
, temperature and environment on fatigue crack growth resistance and interfacial properties.
Figure 5 shows the strain energy values versus stress ratio
(q/[q.sub.f]) under different confining pressures.
In this test, the upper limit stress ratio
0.76 ~ 0.90 was selected, and after the test proved, this range was relatively suitable.
With the results of the pupillary area obtained in each situation, a thermal comfort index denominated Pupillary Stress Ratio
(PSR) (Eq.1) was proposed, being calculated by the ratio of the pupillary area of the animal to the condition in which the reference pupillary area is found (animal in the condition of thermal comfort).
At the RBS portion, maximum stress ratio
of VHSTF-4/5 is 1.80.
In the new model, the yield function includes the changes in the stress ratio
and the mean effective stress.
The 2/1 laminates and 3/2 laminates of the notched fiber-reinforced Al-Li alloy are tested under three kinds of cyclic stress (constant amplitude loading with the stress ratio
R = 0.06, that with the stress ratio
R = -1, and Mini-Twist spectrum loading).
Damage is assumed to initiate when the maximum contact stress ratio
reaches a value of one.
The Eiffel bridge is the most affected by the stress ratio
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).