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Good morning dear all,
regarding impact testing of materials according to ASTM A860 and/or MSS SP75, does anyone know if there can be an empirical link (for example through interpolation) or a mechanical link between the values of absorbed energy (in joule), and shear area? In other words, having the values of absorbed energy, would it be possible to estimate in any manner the values of shear area?


This are multiple factors involved with impact energy.  There are geometry effects (e.g. shear area) and there are materials effects (e.g. cleavage or microvoid fracture mechanisms).  If you can consider the same fracture mechanism, stress condition (plane stress vs. plane strain) and environment (temperature, corrosion, etc.) for two different tests, then you can make some determinations for increased absorbed energy for larger shear area.  However, it is difficult to maintain these identical factors, which complicates the analysis.



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The answer to your last question is: no, unless you have historical shear area data for that steel grade, manufacturing route, and specific manufacturer.  What is the problem; are you sitting with just a bunch of absorbed energy values when your specification also demanded shear areas?

Steve Jones
Materials & Corrosion Engineer

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