On the use of the Theory of Critical Distances to estimate the dynamic strength of notched 6063-T5 aluminium alloy
In this paper the so-called Theory of Critical Distances is reformulated to make it suitable for estimating the strength of notched metals subjected to dynamic loading. The TCD takes as its starting point the assumption that engineering materials’ strength can accurately be predicted by directly p...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2014-10-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero30/numero_30_art_28.pdf |
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| Summary: | In this paper the so-called Theory of Critical Distances is reformulated to make it suitable for
estimating the strength of notched metals subjected to dynamic loading. The TCD takes as its starting point the
assumption that engineering materials’ strength can accurately be predicted by directly post-processing the
entire linear-elastic stress field acting on the material in the vicinity of the stress concentrator being assessed. In
order to extend the used of the TCD to situations involving dynamic loading, the hypothesis is formed that the
required critical distance (which is treated as a material property) varies as the loading rate increases. The
accuracy and reliability of this novel reformulation of the TCD was checked against a number of experimental
results generated by testing notched cylindrical bars of Al6063-T5. This validation exercise allowed us to prove
that the TCD (applied in the form of the Point, Line, and Area Method) is capable of estimates falling within an
error interval of ±20%. This result is very promising especially in light of the fact that such a design method can
be used in situations of practical interest without the need for explicitly modelling the non-linear stress vs. strain
dynamic behaviour of metals. |
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| ISSN: | 1971-8993 1971-8993 |