Prediction of the service life of deep-sea conical acrylic portholes at designing

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.194584

Keywords:

deep-sea portholes, heat aging, acrylic, hydrostatic pressure, prediction of properties, service life

Abstract

Conical deep-sea portholes (CDSP) from acrylic are widely used in underwater equipment. Due to the specific properties of acrylic, operating conditions and the stress-strain state of CDSP, it is difficult to evaluate service life and choose optimal geometric characteristics. The experimental studies and numerical calculations of the stress-strain state of CDSP from acrylic under various levels of hydrostatic pressure were made to develop an optimal design method of CDSP considering operating conditions. CDSP from acrylic were exposed to long-term (up to 7 days) and cyclic (up to 2000 cycles) hydrostatic pressure of 40, 60, 70 and 80 MPa.

The deformation of the CDSP was periodically determined at no less than 20 experimental points with the help of displacement sensors. Experimental dependences of the CDSP displacements were obtained under long-term and cyclic exposure to hydrostatic pressure. According to the method of stress-time analogy, a forecast of the CDSP  deformability for 10 years is made.

The series of CDSP calculations with cone angles of 60–150° and relative thicknesses of 0.35–0.60 using the finite-element method was made. The calculations obtained by the finite-element method coincide with the experimental results, which demonstrated the adequacy of the adopted CDSP design scheme – continuous sliding of the translucent element with friction along the supporting surface of the porthole body. It is shown that an increase in the cone angle reduces the deflection of the CDSP, and equivalent stresses are minimal at cone angles of 75–105°. The synthesis of stress-strain state calculations by the finite-element method in aggregate with the prediction based on short-term tests allows selecting the optimal geometric characteristics of CDSP, depending on the operating conditions

Author Biographies

Yevgen Burdun, Admiral Makarov National University of Shipbuilding Heroiv Ukrainy ave., 9, Mykolayiv, Ukraine, 54025

PhD, Associate Professor

Department of Design and Production of Structures from Composite Materials

Vladimir Kochanov, Admiral Makarov National University of Shipbuilding Heroiv Ukrainy ave., 9, Mykolayiv, Ukraine, 54025

Scientific Researcher

Department of Design and Production of Structures from Composite Materials

Tetyana Yuresko, Admiral Makarov National University of Shipbuilding Heroiv Ukrainy ave., 9, Mykolayiv, Ukraine, 54025

PhD

Department of Design and Production of Structures from Composite Materials

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Published

2020-02-29

How to Cite

Burdun, Y., Kochanov, V., & Yuresko, T. (2020). Prediction of the service life of deep-sea conical acrylic portholes at designing. Eastern-European Journal of Enterprise Technologies, 1(1 (103), 40–46. https://doi.org/10.15587/1729-4061.2020.194584

Issue

Vol. 1 No. 1 (103) (2020): Engineering technological systems

Section

Engineering technological systems

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Copyright (c) 2020 Yevgen Burdun, Vladimir Kochanov, Tetyana Yuresko

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