Use of Finite Element Analysis in Designing Acrylic Structures for Fatigue and Stress

Kemper, Bart

doi:10.13140/rg.2.2.26146.12482/2

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This phenomenon was also observed during full-scale tests of the porthole. These results confirmed the conclusions of [12,25,31].…”

Section: Experimental Research and Discussion Of Resultssupporting

confidence: 93%

“…At the same time, the elastic-plastic state of the porthole made of acrylic glass is considered in [24], but the creeping at cyclic loads is not analysed. The authors of [25] performed calculations for the portholes with h/D = 1, α = 90 • and coefficient of friction on the supporting surface f = 0−0.2 under the action of pressure P = 70 MPa, which agreed well with the results of experiments [12]. However, there is no data on the applicability of this calculation method to the portholes with h/D ≤ 1.…”

Section: Introductionmentioning

confidence: 54%

“…The finite-element method is the most accurate and universal algorithm for calculating the stress-strain behaviour of the class of structures under study [22,23]. The methods for calculation of conical portholes based on the finite-element method are considered in [24][25][26]. It is shown that the translucent element under the action of hydrostatic pressure slides with the friction of the conical supporting surface of the porthole body.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Geometric Parameters of Conical Acrylic Portholes on Their Stress–Strain Behaviour

et al. 2022

View full text Add to dashboard Cite

Translucent elements in the form of truncated cones, which are made of organic glass, are widely used in the structures of portholes, submersible vessels, space vehicles, pressure chambers, teleboxes and other types of technical equipment. The decisive factor in designing portholes is to ensure the strength of their translucent elements. In order to reduce the weight of portholes and, accordingly, to increase the payload, it is necessary to optimise the geometric parameters of the translucent elements, which include the tapering angle and the ratio of thickness to radius of the smaller base. The paper deals with development of the applied (engineering) method for determining the stress–strain behaviour of the conical translucent elements of portholes made of organic glass under the action of a uniform hydrostatic pressure. Finite-element modelling of the translucent element of the conical porthole is performed, with the calculation of its stress–strain behaviour. External hydrostatic pressure of 10 MPa, absence of loads from the inside and continuous sliding of the translucent element with friction along the conical supporting surface of the porthole metal body are the boundary conditions for the computational model. Full-scale tests of translucent elements of portholes made of organic glass were performed under the action of uniform hydrostatic pressure. Analysis of the influence of geometric characteristics of the portholes on stress–strain behaviour showed that the increase in the tapering angle at the constant relative thickness of the translucent element reduced its axial displacement in all cases. Equivalent stresses acquire minimum values when the tapering angle is in the range from 75° to 105° (when the relative thickness increases, the optimal tapering angle becomes smaller). It is shown that the developed method for determination of the stress–strain behaviour of the conical translucent elements of portholes made of organic glass reflects the real picture of deformation and agrees with the results of full-scale tests. Results of the work allow us to choose the rational parameters of the translucent element for increasing the reliability of portholes through the creation of an effective distribution of stresses and strains in the translucent element, and improving its optical characteristics due to a relatively small deflection in operation.

show abstract

“…This phenomenon was also observed during full-scale tests of the porthole. These results confirmed the conclusions of [12,25,31].…”

Section: Experimental Research and Discussion Of Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Geometric Parameters of Conical Acrylic Portholes on Their Stress–Strain Behaviour

et al. 2022

View full text Add to dashboard Cite

show abstract

Design and Analysis of Optical Window Encapsulation Structure for Laser Doppler Deep-Sea Hydrothermal Velocity Measurement System

Wang

et al. 2022

Mathematical Problems in Engineering

View full text Add to dashboard Cite

The optical window is an essential channel for optical signal transmission and return of a deep-sea hydrothermal velocimetry system. Due to its unique structural design, the stress concentration of the optical window will occur under the action of deep-sea high pressure, resulting in cracks at the corner of the high-pressure surface of the optical window, which leads to the inaccurate convergence of the optical signal. A pressure self-balancing optical window package structure is designed to solve the problem. The stress at the optical window is numerically analyzed, and the forces of self-balancing and nonpressure self-balancing optical windows under the same seawater pressure are compared. The results show that the maximum stress at the stress concentration can be reduced by 53% using the pressure self-balancing method, and the phenomenon of stress concentration can be effectively eliminated. In addition, to verify the feasibility of the design and the accuracy of the numerical calculation results, the optical window and its encapsulation structure were experimentally studied, and the deep-sea performance test experiment was carried out on the “Jiaolong” submersible, which further verified the accuracy of the results.

show abstract

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

Burdun

Kochanov

Yuresko

2020

EEJET

View full text Add to dashboard Cite

Конічні глибоководні ілюмінатори (КГІ) з оргскла широко використовуються в підводній техніці. Із-за специфіки властивостей оргскла, умов експлуатації і складного напружено-деформованого стану (НДС) КГІ важко оцінити їх ресурс роботи і вибрати оптимальні геометричні характеристики. Виконано експерименти та чисельні розрахунки НДС КГІ з оргскла при різних рівнях гідростатичного тиску для розробки методики оптимального проектування КГІ з урахуванням умов експлуатації. КГІ з оргскла підавались впливу тривалого (до 7 діб) і циклічного (до 2000 циклів) гідростатичного тиску 40, 60, 70 і 80 МПа. За допомогою датчиків переміщень періодично визначалися деформації КГІ не менше ніж в 20 експериментальних точках. Отримано експериментальні залежності переміщень КГІ при тривалому і циклічному впливі гідростатичного тиску. За методом напружено-часової аналогії здійснений прогноз деформативності КГІ на 10 років. Виконано прогноз зниження механічних властивостей оргскла за методикою прискореного теплового старіння при температурах 40, 70 і 100 °С. Визначено вимоги до граничних деформацій в КГІ. На основі досліджень теплового старіння органічного скла, випробувань КГІ під дією гідростатичного тиску виконана комплексна оцінка їх працездатності в умовах експлуатації на 10-річний період. Виконана серія розрахунків КГІ при кутах конусності 60-150° і відносних товщинах 0,35-0,60 за допомогою методу скінчених елементів. Отримані розрахунки збігаються з результатами експериментів, що свідчить про адекватність прийнятої розрахункової схеми КГІбезвідривному ковзанні світлопрозорого елемента з тертям по опорній поверхні корпусу ілюмінатора. Показано, що збільшення кута конусності зменшує прогин КГІ, а еквівалентні напруження мінімальні при кутах конусности 75-105°. Синтез розрахунків НДС методом скінчених елементів у сукупності з прогнозом на основі нетривалих випробувань дозволяє вибрати оптимальні геометричні характеристики КГІ в залежності від умов експлуатації Ключові слова: глибоководні ілюмінатори, теплове старіння, органічне скло гідростатичний тиск, прогноз властивостей, ресурс роботи

show abstract

Use of Finite Element Analysis in Designing Acrylic Structures for Fatigue and Stress

Cited by 3 publications

References 0 publications

Influence of Geometric Parameters of Conical Acrylic Portholes on Their Stress–Strain Behaviour

Influence of Geometric Parameters of Conical Acrylic Portholes on Their Stress–Strain Behaviour

Design and Analysis of Optical Window Encapsulation Structure for Laser Doppler Deep-Sea Hydrothermal Velocity Measurement System

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

Contact Info

Product

Resources

About