The impact of notch length and applied pressure on the development of confinement stress T within a pipe arc subjected to internal pressure DOI Creative Commons

Bouali Hichem,

Faicel Khadraoui,

Mourad Chitour

и другие.

STUDIES IN ENGINEERING AND EXACT SCIENCES, Год журнала: 2024, Номер 5(2), С. e12024 - e12024

Опубликована: Дек. 12, 2024

Geometric discontinuities within mechanical components can significantly alter the stress distribution, leading to localized concentrations that increase risk of failure. These discontinuities, which take form cracks, notches, or other defects, cause premature material degradation if not properly accounted for during design and analysis phases. The presence such often results in variations stress, may accelerate wear tear systems structures, compromising their integrity over time. This study focuses on numerical T-stress terms Mode I pipeline specimens with external surface cracks. By using difference method (SDM), developed by Yang, this research aims evaluate how applied influences behavior near crack tip. provides a detailed examination evolution these explores changes parameters, as length pressure, affect distribution lead potential highlight importance accurately predicting impact durability under internal pressure.

Язык: Английский

Parametric investigations on dynamic responses of porous functionally graded al/al2o3 plates: effects of homogenization models and material distributions DOI

Mostefa Rabehi,

Billel Rebai, Mustapha Meradjah

и другие.

STUDIES IN ENGINEERING AND EXACT SCIENCES, Год журнала: 2024, Номер 5(2), С. e9051 - e9051

Опубликована: Окт. 11, 2024

This study presents a numerical analysis of the dynamic responses exhibited by functionally graded Al/Al2O3 plates that incorporate porosity. It explores influence critical parameters such as thickness-to-span ratio and porosity coefficient on non-dimensional fundamental frequencies. Various micromechanical homogenization models, including Voigt, Mori-Tanaka, LRVE, Tamura, Reuss, are utilized in conjunction with different material volume fraction distribution profiles: Power-law, Viola-Tornabene four-parameter, Trigonometric. The research considers four distinct variation patterns: uniform, non-uniform, logarithmic mass-density. governing equations addressed using Navier solution technique. findings indicate model results highest frequencies, succeeded Power-law Trigonometric models. Among patterns, mass-density yields maximum whereas uniform leads to lowest. Furthermore, an increase typically raises exception porosity, while reduction frequencies across all These insights essential for optimization designs porous plates.

Язык: Английский

Процитировано

8
On thermo-mechanical buckling of porous bi-directional functionally graded plates using isogeometric analysis DOI

Shuangpeng Li,

Chao Xu, Weisheng Zhang

и другие.

Aerospace Science and Technology, Год журнала: 2024, Номер 155, С. 109520 - 109520

Опубликована: Авг. 29, 2024

Язык: Английский

Процитировано

4
Convective heat transfer analysis of circular tube-annular tube systems with nanofluids: a comparative study DOI

Abdelmadjid Chehhat,

Billel Rebai

STUDIES IN ENGINEERING AND EXACT SCIENCES, Год журнала: 2024, Номер 5(2), С. e9386 - e9386

Опубликована: Окт. 18, 2024

This study investigates the convective heat transfer performance of various fluid combinations within a circular tube-annular tube system, with particular emphasis on influence nanofluids. The analysis evaluates four distinct combinations: base fluid-base (BW), fluid-nanofluid (HN), nanofluid-base (CN), and nanofluid-nanofluid (BN). Convective coefficients were systematically measured across range mass flow rates, effects varying nanoparticle concentrations (ϕ) efficiency meticulously analyzed. results indicate general trend increasing rising rates for most combinations, particularly BW, CN, BN. Notably, however, significant decrease in is observed at higher HN combination, suggesting potential saturation effect that may limit effectiveness this pairing. comparative not only highlights intricate interactions between different types but also provides valuable insights into nanofluids to enhance thermal exchanger applications, paving way future research practical implementations management systems.

Язык: Английский

Процитировано

4
Critical Role of Crystal Orientation and Temperature in Determining the Mechanical Properties and Failure Mechanisms of Gold Nanowires: Insights from Molecular Dynamics Simulations DOI Open Access

D A Luthfiansyah,

Fajrul Ramadhan,

I Nur

и другие.

Journal of Physics Conference Series, Год журнала: 2025, Номер 2942(1), С. 012024 - 012024

Опубликована: Фев. 1, 2025

Abstract The Molecular Dynamics simulations were performed using a parallel code, LAMMPS. A model of Au nanowire was created with initial atomic positions corresponding to those the bulk fcc lattice. original length 100 Å and diameter 40 Å. To simulate an infinitely long nanowire, periodic boundary conditions applied in Z direction. system first equilibrated energy minimization Polak-Ribiere version conjugate gradient algorithm. then brought thermal equilibrium temperature variations 150 K, 300 600 NVT ensemble. As increases from K tensile strength Young’s modulus decline across all orientations due increased vibrations that weaken metallic bonds. Among tested, nanowires aligned lattice (Z-axis <0 0 1>) exhibited highest stiffness at lower temperatures, suggesting greater robustness this configuration. Notably, rotated 45° along X or Y-axis demonstrated slightly better resilience temperature-induced weakening, likely specific arrangements these orientations. Under strain, rotation around Z-axis maintained stable FCC structure up 11.95% strain. Beyond strain level, significant deformation occurred, characterized by appearance HCP regions other structural deviations, which indicate heightened risk mechanical failure. In contrast, experienced transformations complex dislocations levels, underscoring susceptibility These findings highlight critical influence crystallographic orientation on behavior gold nanowires.

Язык: Английский

Процитировано

0
The Novel Vogel's Approximation Method Integrated with Random Forest Algorithm in the Vibration Analysis of Two-directional Functionally Graded Taper Porous Beam: Assessment DOI Creative Commons
Ravikiran Chintalapudi,

N. K. Geetha,

Bridjesh Pappula

и другие.

Scientific African, Год журнала: 2024, Номер unknown, С. e02397 - e02397

Опубликована: Сен. 1, 2024

Язык: Английский

Процитировано

1
The impact of notch length and applied pressure on the development of confinement stress T within a pipe arc subjected to internal pressure DOI Creative Commons

Bouali Hichem,

Faicel Khadraoui,

Mourad Chitour

и другие.

STUDIES IN ENGINEERING AND EXACT SCIENCES, Год журнала: 2024, Номер 5(2), С. e12024 - e12024

Опубликована: Дек. 12, 2024

Geometric discontinuities within mechanical components can significantly alter the stress distribution, leading to localized concentrations that increase risk of failure. These discontinuities, which take form cracks, notches, or other defects, cause premature material degradation if not properly accounted for during design and analysis phases. The presence such often results in variations stress, may accelerate wear tear systems structures, compromising their integrity over time. This study focuses on numerical T-stress terms Mode I pipeline specimens with external surface cracks. By using difference method (SDM), developed by Yang, this research aims evaluate how applied influences behavior near crack tip. provides a detailed examination evolution these explores changes parameters, as length pressure, affect distribution lead potential highlight importance accurately predicting impact durability under internal pressure.

Язык: Английский

Процитировано

0