An autographic extensometer for use at temperatures up to l000°C is described. Strain information is obtained from within a high vacuum enclosure by a unique application of linear variable differential transformers which provides great versatility in strain magnification and range. Important details of the vacuum test chamber and extensometer are given. Typical high temperature stress- strain records for uranium and tantalum are included to illustrate the performance of the equipment.
Bohn, J. R. and Murphy, Glenn, "A high-temperature vacuum extensometer" (1960). Ames Laboratory Technical Reports. 23.