Abstract
Mechanical properties of BTA deep drilled components made of AISI 4140+QT under quasi-static loading are analyzed in instrumented compression tests, inspired by the tube-flattening test according to DIN EN ISO 8492. Digital image correlation (DIC) analysis is used to observe spatial strain distribution on the front side of specimens during compression. It is found that microstructural changes resulting from drilling, particularly the formation of white etching layers (WEL), play a key role in the loading capability of the components under compression. Higher forces needed to be applied to compress specimens with WEL and crack initiation was observed at lower displacements.
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