The modeling of machining processes is often limited by the availability of material data appropriate for the high strain rates and rapid heating associated with the metal cutting process. A new NIST facility - the pulse heated Kolsky bar apparatus - has been built to provide material data at strain rates on the order of 1000 to 40000 per second and at temperatures up to 1300 K to simulate machining conditions. The Kolsky bar consists of two long cylindrical bars (1.5 m length by 15 mm diameter) with a small material test sample (2 mm length by 4 mm diameter) sandwiched between the bars. For a test the first bar is impacted with a projectile fired from a air gun and the output data is recorded from strain gages on the long bars. The fabrication and assembly procedures used to obtain the required precision alignment of the Kolsky bar apparatus are discussed in the paper.
Proceedings Title: Proceedings of the Seventeenth Annual Meeting, The American Society of Precision Engineering
Conference Dates: October 20-25, 2002
Conference Location: St. Louis, MO
Conference Title: Seventeenth Annual Meeting, The American Society of Precision Engineering
Pub Type: Conferences
dynamic material properties, Kolsky bar test, modeling machining processes, precision alignment