Energy Stored During Fatigue of Copper

Clarebrough, L. M.; Hargreaves, Mark; Head, A. K.; West, G. W.

doi:10.1007/bf03377461

Cited by 11 publications

(18 citation statements)

References 4 publications

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“…established a materials research laboratory in which metallurgists and mathematicians conducted long range research programmes on problems relevant to fatigue. Head [42] discussed theoretical suggestions as to how a fatigue crack may form and grow and he and co-workers made notable contributions in this area ( [15], [20], [39]- [44] and [47]). Mann [78] developed a theory for the internal stresses set up by slip that generalised that due to Volterra [115].…”

Section: Fatiguementioning

confidence: 99%

Mathematical research at the Aeronautical Research Laboratories 1939–1960

Hurley¹

1989

J. Aust. Math. Soc. Series B, Appl. Math

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The Aeronautical Research Laboratories were established in Australia in 1939 as the CSIR Division of Aeronautics. Mathematicians were amongst the first staff employed, and their number reached a peak in the mid 1950s. They were an able group: in their subsequent careers 12 became Professors, 5 obtained higher doctorates, 6 became Fellows of the Australian Academy of Science and 6 Fellows of the Royal Society. They published over 100 papers, and these are discussed here under 11 separate headings.The length of discussion given here to the various areas of research is not uniform. I have emphasised those with which I am familiar and those that interest me personally. Nevertheless, I believe the present paper provides an accurate picture of the mathematical research that was carried out at ARL during the period under review, and makes it clear that mathematicians at ARL made substantial contributions to many areas of theoretical aeronautics.

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Section: Fatiguementioning

confidence: 99%

Mathematical research at the Aeronautical Research Laboratories 1939–1960

Hurley¹

1989

J. Aust. Math. Soc. Series B, Appl. Math

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“…Такой переориентировкой дислокаций мож-но объяснить также наблюдавшееся Клерброу и др. 25 выделение запасен-ной энергии в холоднодеформированной меди при сравнительно низких температурах, при которых измерения теплопроводности 55 свидетель-ствуют об отсутствии уменьшения плотности дислокаций. Уменьшение высоты пиков Бордони в материале с примесями или после облучения нейтронами может объясняться закреплением сегментов дислокаций атомами примесей и точечными несовершенствами соответственно и проис-ходящим в результате этого уменьшением эффективной длины петель дислокаций.…”

Section: (и)unclassified

“…Приме-няя эти допущения, Гранато и Люке рассчитали, что внутреннее трение равно (25) где Ω -фактор ориентировки, учитывающий, что скалывающая соста-вляющая напряжения на плоскостях скольжения меньше приложенного вапряжения; К -фактор (также зависящий от ориентировки), свя-занный с напряжением, необходимым для разблокировки; η -параметр несоответствия Коттрелла, а -межатомное расстояние, L c -среднее расстояние между атомами примеси, связанными с дислокациями, и ε 0 -максимальное значение переменной деформации. Изменение модуля вы-ражается как где г -постоянная порядка единицы.…”

Section: (^ (24)unclassified

Внутреннее Трение В Металлах, Связанное С Дислокациями

Niblett¹,

Uilks²

1963

Usp. Fiz. Nauk

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“…ApPLICATIONS . Equation (6) can be used to determine activation energies for recrystallization from data given in Olarebrough, Hargreaves, and West (1955). Thus, for electrolytic copper (99·98 per cent.…”

Section: By Using Equationsmentioning

confidence: 99%

“…One feature of the isothermal technique is that the activation energies of the recovery processes can be readily determined (Gordon 1955). It is the purpose of this note to point out that activation energies can also be determined from calorimetric measurements of the type made by Olarebrough et al (1952) and by Clarebrough, Hargreaves, and West (1955) where the rate of heating, i.e. the rate of increase of temperature, is constant.…”

Section: Introductionmentioning

confidence: 97%