Synergy of crack closure, near-tip residual stress and crack-tip blunting in crack growth under periodic overloads – A fractographic study
| Parent link: | International Journal of Fatigue: Scientific Journal.— , 1979- Vol. 93, pt. 1.— 2016.— [P. 18-29] |
|---|---|
| Corporate Author: | |
| Other Authors: | , , , |
| Summary: | Title screen Fatigue crack growth tests were performed on an Al-Cu alloy under specially designed load sequences with a periodic overload cycle. These overloads were either immediately followed by or preceded by underloads of controlled magnitude. Baseline loading magnitude was designed to induce near-threshold conditions well below the Paris Regime. The fatigue fracture surfaces obtained from the tests were subject to fractographic analysis. The study shows that irrespective of their magnitude, underloads preceding tensile overloads do not affect crack growth rate after the overload. However, if the underload follows an overload, it carries a deleterious effect on retardation, whose magnitude is determined by the extent to which the underload drops below baseline cycling level. In either case, observed effects do not seem to have anything to with crack closure, but rather, are attributable to the effect of underloads on near-tip residual stress during baseline cycling that in turn controls threshold stress intensity range. Post-overload crack closure is reduced by crack-tip blunting, but rapidly recovers. Режим доступа: по договору с организацией-держателем ресурса |
| Language: | English |
| Published: |
2016
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| Subjects: | |
| Online Access: | http://doi.org/10.1016/j.ijfatigue.2016.08.004 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=654062 |
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| 200 | 1 | |a Synergy of crack closure, near-tip residual stress and crack-tip blunting in crack growth under periodic overloads – A fractographic study |f S. Ramasubbu [et al.] | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 320 | |a [References: p. 29 (16 tit.)] | ||
| 330 | |a Fatigue crack growth tests were performed on an Al-Cu alloy under specially designed load sequences with a periodic overload cycle. These overloads were either immediately followed by or preceded by underloads of controlled magnitude. Baseline loading magnitude was designed to induce near-threshold conditions well below the Paris Regime. The fatigue fracture surfaces obtained from the tests were subject to fractographic analysis. The study shows that irrespective of their magnitude, underloads preceding tensile overloads do not affect crack growth rate after the overload. However, if the underload follows an overload, it carries a deleterious effect on retardation, whose magnitude is determined by the extent to which the underload drops below baseline cycling level. In either case, observed effects do not seem to have anything to with crack closure, but rather, are attributable to the effect of underloads on near-tip residual stress during baseline cycling that in turn controls threshold stress intensity range. Post-overload crack closure is reduced by crack-tip blunting, but rapidly recovers. | ||
| 333 | |a Режим доступа: по договору с организацией-держателем ресурса | ||
| 461 | |t International Journal of Fatigue |o Scientific Journal |d 1979- | ||
| 463 | |t Vol. 93, pt. 1 |v [P. 18-29] |d 2016 | ||
| 610 | 1 | |a электронный ресурс | |
| 610 | 1 | |a труды учёных ТПУ | |
| 610 | 1 | |a near threshold fatigue | |
| 610 | 1 | |a near-tip residual stress | |
| 610 | 1 | |a crack closure | |
| 610 | 1 | |a crack-tip blunting/re-sharpening | |
| 610 | 1 | |a variable-amplitude loading | |
| 610 | 1 | |a остаточные напряжения | |
| 610 | 1 | |a трещины усталости | |
| 610 | 1 | |a амплитуда | |
| 610 | 1 | |a нагружение | |
| 701 | 1 | |a Ramasubbu |b S. |c specialist in the field of material science |c Professor of Tomsk Polytechnic University |f 1953- |g Sunder |3 (RuTPU)RU\TPU\pers\38253 | |
| 701 | 1 | |a Byakov |b A. V. |c specialist in the field of material science |c engineer of Tomsk polytechnical university, Candidate of Technical Sciences |f 1985- |g Anton Viktorovich |3 (RuTPU)RU\TPU\pers\35461 | |
| 701 | 1 | |a Eremin |b A. V. |c specialist in the field of material science |c Engineer of Tomsk Polytechnic University |f 1990- |g Alexandr Vyacheslavovich |3 (RuTPU)RU\TPU\pers\32912 | |
| 701 | 1 | |a Panin |b S. V. |c specialist in the field of material science |c Professor of Tomsk Polytechnic University, Doctor of technical sciences |f 1971- |g Sergey Viktorovich |3 (RuTPU)RU\TPU\pers\32910 |9 16758 | |
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