Page 163 - Mechanical Behavior of Materials

164 Chapter 4 Mechanical Testing: Tension Test and Other Basic Tests

Figure 4.34 Rockwell hardness indentation made by application of (a) the minor load, and
(b) the major load, on a diamond Brale indenter. (Adapted from [Boyer 85] p. 34.6; used with
permission.)

carbon and alloy steels, a conversion chart for estimating various types of hardness from one another,
and also ultimate tensile strength, is given as Table 4.9. More detailed conversion charts for steels
and other metals are given in ASTM Standard No. E140, in various handbooks, and in information
provided by manufacturers of hardness testing equipment.

4.8 NOTCH-IMPACT TESTS

Notch-impact tests provide information on the resistance of a material to sudden fracture where
a sharp stress raiser or flaw is present. In addition to providing information not available from
any other simple mechanical test, these tests are quick and inexpensive, so they are frequently
employed.