Abstract
This paper presents a method of testing sheet materials at elevated temperatures using direct resistance heating. The problems associated with the use of direct resistance heating are discussed by referring to investigations on the heating characteristics of short, rectangular sheet blanks. Experimental results show that elevated-temperature tensile tests at considerably fast strain rates can be carried out using direct resistance heating. The major drawback is shown to be the non-uniformity of temperature of the test specimen at its ends due to heat transfer from the specimen to the unheated jaws. Ways of minimizing this non-uniformity are discussed and a suggestion is made for further reduction by indirect resistance heating of jaws using an independent power supply.
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