Tweet
The 'blue pill'...
is the standard proof load, not an intentional torture test overload, and was so-called because the specially-manufactured brass cases were tin-plated for identification. The original 1906 proof load was 70 kpsi, which was later increased to 75 kpsi in an effort to eliminate any marginal action components, after the initial problems with heattreatment came to light.
Hatcher reported on extreme overloads (up to 133 kpsi, IIRC), which the DHT actions were able to withstand intact, but such loads were never anything but a demonstration of the ultimate strength and much improved margin of safety in the DHT actions.
mhb - Mike
is the standard proof load, not an intentional torture test overload, and was so-called because the specially-manufactured brass cases were tin-plated for identification. The original 1906 proof load was 70 kpsi, which was later increased to 75 kpsi in an effort to eliminate any marginal action components, after the initial problems with heattreatment came to light.
Hatcher reported on extreme overloads (up to 133 kpsi, IIRC), which the DHT actions were able to withstand intact, but such loads were never anything but a demonstration of the ultimate strength and much improved margin of safety in the DHT actions.
mhb - Mike
Comment