Four point bending test

As the name implies, bending tests are carried out to ensure that a substrate (e.g. ceramic, FR4 board or silicon) has sufficient resilience to withstand a specified bend strain. The sample is bent between three or four points to a specified displacement or arc.
http://www.xyztec.com/test_types/bending.php

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Видео Four point bending test канала bondtesters