Drawbacks of carbon dating
This is only one of several competing hardness scales, but one of the most widely used, so I use it in place of such possibly more accurate hardness scales (97.5 RB = 20 RC = 238 Vickers = 226 Brinell (minimum RC and Vickers), 251 Vickers = 240 Brinell, and 832 Vickers = 739 Brinell).
Though Brinell testing is not usually used at such high hardness values, a hardness of 66 RC is roughly 757 Brinell, 67 RC is roughly 775, and 68 RC (highest RC used) is roughly 794--these Brinell values would need a test ball harder than tungsten carbide to reach (diamond? A slash (/) means "face maximum/back average" for face-hardened armors.
Hruska’s machine – we are told – will carry sponsorship from both Precision Turbo and Mickey Thompson Performance Tires & Wheels — the latter of whom has been the primary backer of Glidden’s racing efforts dating back to his return to NHRA Pro Stock in 2007.
The union of Glidden and Hruska is of particular intrigue, as it marks not only the first time that Glidden has been a true hired-gun driver, but also, to our knowledge, the first time he’s driven a car that wasn’t either naturally-aspirated or nitrous oxide-assisted.
The higher that this is, the stronger the metal is against slowly-increasing, non-impact loads. Test sample's minimum slow stretching force per unit original cross-sectional area needed to make the sample permanently lengthen by 2%, in pounds/square inch. Developed in the early 20th Century in Sweden as a measure of the resistance of a material to local deformation under a near-point stress, here a tiny tungsten (wolfram)-carbide ball under a 3,000 kg (6,614.4 lb) load (other versions of this scale exist, but this covers the largest range for hard materials).
The higher that this is, the stronger the metal is against slowly-increasing, non-impact loads, but only against impact loads if the tensile strength is going up by the same percentage. Percent of the sample's original cross-sectional area by which the narrowest point of the sample had shrunk just as it snapped in two. A formula for the size of the pit formed gives the Brinell Number, with wrought iron being about 100 (actually, 105 is the average) and circa 794 being as hard as the hardest pure cementite (actually, as the hardness goes above 650, the tiny ball begins to flatten out and the values give a greater difference than is actually there, while above 739 the tiny ball flattens out so = badly that it cannot be used).
The team skipped the NHRA Southern Nationals in Atlanta while chassis builder Larry Jeffers and his team completed repairs.