crack growth simply because there are gaps between the wires through which the cracks could grow. However, the braid would limit crack opening and so retard growth. On the other hand, there was evidence that parts of the braid had rusted, and several free ends of the wires were seen on ...
crack propagation rates of an autofrettaged steel tube are compared with those of the untreated base material [110]. In agreement withEqu. 6.5, loading with a constant stress intensity range results in a constant crack propagation rate of the residual stress free state. However, if the crack ...
Sign in to download hi-res image Fig. 38. Fatigue crack origins of as built LPBF AlSi10Mg samples. Surface porosity in high cycle fatigue with N = 2.74 × 106 (a), internal porosity in very high cycle fatigue with N = 4.48 × 108 [37] (b), typical manifestation...
Sign in to download full-size image Fig. 4.1.Longitudinal crack. The transverse crack is one of the most common cracks found on pavement in China and generally is taken as a kind of premature damage. The transverse crack is vertical to the centerline of a highway and is generally considered...
Width and depth of cracks propagating in residual stress free and tensile residual stress areas of a low carbon steel (Δσ = 188 N/mm2, R = −0.5) [108]. Sign in to download full-size image Figure 6.27. Wöhler-curves for fracture and different crack lengths of untreated and deep ...
The crack can grow by an increment of length Δc, from one local minimum to the next stable minimum, by thermally activated chemical processes that overcome the local free energy barrier ΔF. For a first-order chemical reaction, reaction rate theory predicts that the time this takes depends ...
10.18d), the crack becomes almost aconjugate of the crack observed under the static loading case. At 1000 mm/s (Fig. 10.18e), it becomes vertical and small branching in the end can be seen, which is attributable to the free edge, instead of crack propagation velocity. On further ...
1 The Short Crack Problem For the treatment of long fatigue cracks, the similitude concept is very powerful: identical near-tip conditions prevail in specimens of different sizes containing different crack geometries if the magnitude of the characterizing parameter is the same (Suresh 1994). Under ...
Sign in to download full-size image Fig. 5.Detection and removal of crack healing by synchrotron X-ray topography (room temperature loading,g→=22¯0):a,K= 0.14KIC, dark–white contrast (crack tip stress) appears 1 mm above the extremity of the precrack; b,K= 0.4KIC, dark-white co...
For the lower-strength C–Mn steels, theoretical predictions (see Section “Crack-tip Environment”) do not support an effect under free corrosion conditions. An impact at low cathodic polarization potentials is feasible but mainly on the basis of time-dependent transport of hydrogen from the ...