DEFORMATION OF A THIN FILM AFTER CONTACT LOSS WITH A CYLINDRICAL BASE UNDER THE INFLUENCE OF ITS CURVATURE, COMPLIANCE AND TRANSVERSE FORCES; DELAMINATION LOCATED IN THE CIRCUMFERENTIAL DIRECTION
Author details
- Ishlinsky Institute for Problems in Mechanics RAS, Moscow, Russian Federation
Abstract
The process of delamination of a coating from a cylindrical substrate under the action of compressive stresses is considered. The solution of the problem was obtained within the theory of cylindrical shells. The Mushtari-Donnell-Vlasov equations were used as the equilibrium equations, and the conditions of the generalized elastic clamped type were used as the boundary conditions. Expressions are obtained for the coating displacement components and the energy release rate during delamination along the rectilinear and curvilinear delamination boundaries. The profiles of the exfoliated section of the coating were obtained. The role of the substrate compliance and its curvature on the values of the energy release rate and the angle of rotation at the clamping point, as well as in the change in the shape of the coating profile, is revealed. It is shown that with an increase in the compliance of the substrate, as well as the value of (positive) curvature, the value of the energy release rate and the value of the normal component of the displacement of the coating increase significantly. It has been found that at sufficiently large values of the substrate curvature, a corrugation effect occurs in the profile of the delaminated section of the coating, which leads to the appearance of local extrema in the graph of the dependence of the energy release rate on the delamination length. This effect was not observed in the delamination located in the longitudinal direction [1]. It is also shown that for sufficiently compliant substrates there is a certain critical delamination width, for which it becomes energetically more favorable for delamination to develop in the circumferential direction than in the axial one. As the positive curvature and compliance of the substrate increase, the value of the critical width decreases. An alternative criterion for the critical delamination width is also considered, which consists in studying the value of the angle of rotation at the embedding point, which corresponds to the overlap of the coating and substrate surfaces at an angle value of zero.
Keywords
ДЕФОРМИРОВАНИЕ ТОНКОЙ ПЛЕНКИ ПОСЛЕ УТЕРИ КОНТАКТА С ЦИЛИНДРИЧЕСКИМ ОСНОВАНИЕМ С УЧЕТОМ ВЛИЯНИЯ ЕГО КРИВИЗНЫ, ПОДАТЛИВОСТИ И ДЕЙСТВИЯ ПОПЕРЕЧНЫХ СИЛ; ОТСЛОЕНИЕ, РАСПОЛОЖЕННОЕ В ОКРУЖНОМ НАПРАВЛЕНИИ
Рассмотрен процесс образования отслоения покрытия от цилиндрического основания под действием сжимающих напряжений. Решение задачи получено в рамках теории цилиндрических оболочек. В качестве уравнений равновесия использовались уравнения Муштари – Доннелла – Власова, а в качестве граничных условий – условия типа обобщенной упругой заделки. Получены выражения для компонент смещения покрытия и скорости высвобождения энергии при отслоении вдоль прямолинейной и криволинейной границы отслоения. Получены профили отслоившегося участка покрытия. Выявлена роль, вносимая податливостью основания и ее кривизны в значения скорости высвобождения энергии и угла поворота в точке заделки, а также в изменение формы профиля покрытия. Показано, что при увеличении податливости основания, а также (положительной) кривизны значения скорости высвобождения энергии и величины нормальной компоненты смещения покрытия существенно возрастают. Обнаружено, что при достаточно больших значениях кривизны основания в профиле отслоившегося участка покрытия возникает эффект гофрирования, что приводит к появлению локальных экстремумов в графике зависимости скорости высвобождения энергии от протяженности отслоения. Данного эффекта не наблюдалось при исследовании отслоения, расположенном в продольном направлении [1]. Также показано, что для достаточно податливых оснований существует некоторая критическая ширина отслоения, для которой отслоению становится энергетически выгоднее развиваться за счет удлинения, чем за счет расширения. При увеличении положительной кривизны и податливости основания значение критической ширины уменьшается. Также рассмотрено альтернативное условие существования критической ширины отслоения, заключающееся в исследовании величины угла поворота в точке заделки, соответствующей перекрытию поверхностей покрытия и основания при значении угла равного нулю.
Ключевые слова
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