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Crack cocaine, commonly known simply as crack, and also known as rock, is a free base form of the stimulant cocaine that can be smoked. Crack offers a short, intense high to smokers. The Manual of Adolescent Substance Abuse Treatment calls it the most addictive form of cocaine.
Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to fracture.
We do need to go back in time a bit, but it's a surprisingly modern tale given how long Christmas has been celebrated. So, let's crack open the history of the Christmas nutcracker! Sanja Baljkas ...
Crack Is Wack is a mural created in 1986 by American artist and social activist Keith Haring.. Located near the Harlem River Drive in the East Harlem neighborhood of Manhattan in New York City, the mural serves as a warning against crack cocaine use, which was rampant in major cities across the United States during the mid to late 1980s.
Tensile cracks, also referred to as wing cracks (red) grow at an angle from the edges of the shear fracture allowing the shear fracture to propagate by the coalescing of these tensile fractures. Cracks in rock do not form smooth path like a crack in a car windshield or a highly ductile crack like a ripped plastic grocery bag.
What do they symbolize? The earth is abundant with gemstones. And, like Zodiac signs, each gem has its own meaning. Gemstone meanings are inspired by everything from royal traditions and chakras ...
Especially if you don't know when that crack happened or how it got there, it's best to use the old adage: When in doubt, throw it out. Now with that said, if you caused the crack and saw it ...
Fracture toughness varies by approximately 4 orders of magnitude across materials. Metals hold the highest values of fracture toughness. Cracks cannot easily propagate in tough materials, making metals highly resistant to cracking under stress and gives their stress–strain curve a large zone of plastic flow.