Correlation between Charpy absorbed energy and critical COD is investigated to get a useful method for estimating critical COD from Charpy V data. Round bar tension test, Charpy V impact test and static 3-point bending test with fatigue notched specimen are carried out using mild steel, 80 kgf/mm2 grade high strength steel and A5083 aluminum alloy.
Correlations are found between W'c/σY and δc, as well as between EW'c/σ2Y and Eδc/σY, where W'c is Charpy absorbed energy obtained by considering temperature difference between Charpy transition temperature and COD transition temperature. The symbols σY, δc and E are yield strength, critical COD and Young's modulus respectively. The correlations are established for various kinds of metals and over a wide temperature range including not only upper shelf range but also transition range.
