Quantifizierung von Zahigkeitsanforderungen und lokale Beanspruchung bei Biegebelastung
In the course of this investigation into the mechanical-rupture toughness requirements of beams under bending stress it was shown that these are dependent upon the nature of the crack and the depth of the crack. The toughness requirement rises with increasing relative crack depth up to a maximum value where a/t = 0.35. Beyond this point they fall away again. However in the region of reducing toughness requirements, the safety criterion of general yield is no longer a logical one because in the case of the deep cracks under consideration, the strength problems caused by the strongly-reduced cross-sectional area predominate and mechanical-fracture considerations are no longer relevant. Even a decreasing a/c ratio calls for an increase in the toughness requirements. The increase is greater than a linear relationship. Future work will be aided by the findings in this report relating to the usefulness of the analysis of "DECT"-plates of similar geometry in determining local stress magnitudes and the absence of any difference between 3- and 4-point bending in terms of toughness requirements.
Bibliographic Reference: EUR 18609 DE (1998) 73pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-5054-4
Record Number: 199910960 / Last updated on: 1999-07-16
Original language: de
Available languages: de