Charpy impact test - it is all about fitting and applying sub-sized test piece results correctly

What is it about?

The paper is focused on the approximation of absorbed Charpy impact energy-temperature curves and the management of sub-size test piece results in Charpy pendulum impact tests. Both subjects are frequently underestimated but may have a strong impact on the assessment of product quality and structural integrity. proportional scaling of sub-size to full-size test piece results in terms of KV should be disallowed because it is a wrong approach. Regulations still incorporating such procedures should be revised as soon as possible. Existing nonproportional scaling and conversion procedures were applied. The results obtained illustrate that neither an overall nor consistent conservativeness nor an adequate conservativeness level can be achieved. In summary, the standardizing bodies should enforce the discussion to revise relevant test standards considering more precise specifications on Charpy data fitting. Furthermore, proposals are made for an improved management of sub-size test piece results.

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Why is it important?

The subjects of the paper, the approximation of absorbed Charpy impact energy-temperature curves and the management of sub-size test piece results from Charpy pendulum impact tests, are frequently underestimated. But they may have a strong impact on the assessment of product quality and structural integrity, since current product standards and integrity assessment procedures provide incorrect and/or insufficient information.

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