By sectioning specimens strained to various stages of the fatigue stress cycle, it has been shown that crack propagation and fracture ripple formation are the consequences of the successive rounding and sharpening of the crack tip during each stress cycle. The hypothesis that high stress fatigue is...
FATIGUE CRACK PROPAGATION IN BIAXIAL STRESS FIELDS Biaxial tension-compression fatigue tests were conducted with cruciform shaped specimens in a closed-loop servo hydraulic testing machine. The effects of s... K.,TANAKA,T.,... - 《Fatigue & Fracture of Engineering Materials & Structures》 被引量...
Fatigue crack propagation tests under a high stress intensity range have been carried out on a low alloy structural steel BS 4360 Grade 50B. Crack growth rates ranging from about 105mm/cycle to over 0.1 mm/cycle have been recorded. Fatigue tests took on three kinds of control modes to ...
The fatigue fracture process of high-strength bolts is generally separated into three stages, namely, crack initiation at the bottom of the thread, stable crack propagation along the root of the thread, and rapid fracture stage, and the first two stages can basically be considered as the entire...
The results showed that the rate of fatigue-crack propagation in the 18Ni (250) maraging steel was insensitive to moisture in the test environment. Nearly the same rates of crack propagation were observed in dry argon, humid argon, and humid hydrogen. The influence of dry hydrogen was, ...
Fatigue crack propagation behavior and stress-induced martensitic transformation behavior in two types of TiNi were investigated: One is TiNi with shape memory effect, FML4, the other is superelastic TiNi, FML6, at room temperature. In addition to the observation of fatigue cracks by optical and ...
The concept of Griffith fracture theory was extended to fatigue crack propagation problems by defining the Gibbs free energy of solids under cyclic loading. As a result, the rate of fatigue crack propagation, dc/dN, was obtained as % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd...
The influence of roller burnishing on the fatigue crack propagation in notched round bars—Experimental observations under three‐point bending Crack propagation is delayed by the introduction of compressive residual stresses. In this way, the process is particularly useful in the presence of stress......
Fatigue crack propagation behavior together with fatigue life evaluation in high performance steel were investigated by means of fatigue crack propagation test under constant loading conditions such as 0.1, 0.3, and 0.5 stress intensity factor ratio and load frequency, respectively. A modified Forman mod...
Fatigue and Fatigue Crack Propagation of Nd:YAG Laser Beam Welded Magnesium AZ31-HP Sheet Material Process development of fiber laser welding of dissimilar titanium T-joints Laser straightening of the welded joints using the same equipment as for welding... M Horstmann,S Riekehr,V. Ventzke,......