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However, once the sources begin to act, and the loading strain rate is not so fast as to de-pin the crack from its dislocations, then the material becomes ductile. The brittle/ductile transition in this simplest case has been worked on by a number of authors in recent years, and we ...
At plain, macroscopically unnotched surfaces, microstructural features act as crack stoppers. Common crack barriers are grain boundaries but other elements such as sub-grain and twin boundaries or second phases, e.g., Fe3C in perlite, can also take over this role [57]. The blocking effect of ...
It takes hours (in some casesweeks) and a certain amount of practice and skill to build the row, but anyone can knock it down in the blink of an eye if it’s been built right.Properly built, tipping over the first one triggers a process thatcan’tbe stopped! Now, come closer. Here...
"Night of the Living Squishies"; act three, scene four. Ready on set?! Nefarious trooper: I should never have quit dental school. Dr. Nefarious: Aaand action! You'll never take me alive, Qwark! Time is under my control! Lawrence (hologram): Oh, am I interrupting? Dr. ...
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These fibers “bridge” the crack, i.e., they carry stresses that act as tractions to decrease the crack opening relative to the opening of a crack with traction-free surfaces. Far from the tip of such a matrix crack and in the plane of the bridged crack, the axial matrix stress is...
However, for steels in the active state, different limiting conditions may prevail because reduction of water external to the crack can act as a source of hydrogen atoms and indeed can become the dominant source determining crack growth kinetics. 6.04.4.4 Environmentally Short Crack The underlying ...