Charpy V-notch specimen

Standard test methods are used to provide assurance that test data from various laboratories yield meaningful results. Therefore, test specimens must meet the requirements of ASTM E 8 for tensile specimens, ASTM E 23 for Charpy V-notch specimens, and ASTM A 370 for both tensile and Charpy specimens. Fracture toughness specimens and testing methods should meet the intent of ASTM E 399, E 1820 and E 1921. 

ASTM (2013g), Standard Test Method for Impact Testing of Miniaturized Charpy V-notch Specimens, E2248, Annual Book of ASTM Standards, Vol. 03.01, ASTM. International, West Conshohocken, PA. 

Fast, P. J., Susskind, C. S., and Raymond, L., "Charpy V-Notched Specimens for Indexing Stress Corrosion Cracking in HY Ship Steels and Weld Metals, Final report under contract F04701-78-C-0079, The Aerospace Corporation, August 1979. 

Charpy V-Notch Specimens are V-Notched per ASTM A673/A673M and tested... 

Figure 8.14 Photograph of fracture surfaces of A36 steel Charpy V-notch specimens tested at indicated temperatures (in °C).

As a typical example, fig. 8 illustrates the effect of rare earth addition on toughness the impact curves are plotted for both longitudinal and transverse Charpy V-notch specimens (Luyckx et al. 1970). In longitudinal specimens, the impact energy at 100% shear, commonly called the shelf energy, is in excess of 5.5 kg m (40 ft lb) in transverse specimens, it is 2kgm (15 ft lb), which is doubled to 4kgm at the Ce/S ratio of 1.5-2.0. 

Table 5-19 lists selected data on the effects of irradiation on the notch-impact properties of a number of steels. The increase in transition temperature and the percentage of loss of energy absorption are shown as a function of neutron dose. The data were obtained on subsize Izod impact specimens. Limited information on full size Charpy V-notch specimens has indicated that at doses of the order of 5 X 10 fast neutrons/cm, larger transition temperature shifts (by about a factor or two) are observed than with subsize Izod specimens. Thus there may be a size effect to be considered. 

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