Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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Subject: search.filters.subject.Fatigue

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Now showing 1 - 5 of 5
  • Article
    Citation - WoS: 7
    Citation - Scopus: 7
    Bond-Based Peridynamic Fatigue Analysis of Ductile Materials With Neuber's Plasticity Correction
    (Springer, 2024) Altay, Ugur; Dorduncu, Mehmet; Kadioglu, Suat; Madenci, Erdogan
    This study introduces an approach for performing bond-based (BB) peridynamic (PD) fatigue analysis of ductile materials. Existing BB PD fatigue models do not account for the effect of plastic deformation. The current approach addresses this by incorporating Neuber's plasticity correction concept into the fatigue model. Neuber's correction adjusts the stress and strain predictions of the PD elastic solution to account for local plastic deformation around crack tips. The PD fatigue simulations demonstrate the effectiveness of this method and improvements in fatigue life predictions by considering local plasticity effects. The numerical results first examine the response of a ductile plate without a crack under quasi-static monotonic loading. Subsequently, specimens exhibiting Mode I and mixed-mode crack propagation paths due to cyclic loading are analyzed. The PD predictions accurately capture the test data. Additionally, the model specifically investigates the effect of a stop hole on fatigue life.
  • Article
    Citation - WoS: 1
    Citation - Scopus: 1
    Fatigue Assessment of Copper-Brazed Stainless-Steel Joints for Plate Heat Exchangers
    (Wiley, 2025) Hayta, Yigit; Kandemir, Sinan
    Cyclic pressures can cause fatigue failure in the brazed joints and plates of the plate heat exchangers (PHEs). This study examines the fatigue behavior of PHEs made from 316L and 304L steels brazed with copper foils employing strain-controlled fatigue tests to explore if 304L could replace 316L in the existing production line for cost reduction. Fatigue tests were conducted at four different load levels with a stress ratio of zero and a frequency of 5 Hz. Finite Element Analysis was used to assess strain distribution and estimate PHE lifespan based on generated strain versus number of cycles to failure curves. The microstructural analysis revealed that copper diffuses more easily into 316L than 304L, and using 50 mu m thick foil causes more defects compared with 100 mu m foil. It was shown that 316L joints have a significantly increased fatigue life compared with 304L. Both 316L and 304L met the 15-year lifetime requirement set by manufacturers.
  • Book Part
    Citation - Scopus: 2
    Mechanical Performance of Metallic Biomaterials
    (Elsevier, 2023) Uzer-Yilmaz,B.
    Metallic biomaterials prevail over other classes of biomaterials with their synergistic combination of superior mechanical properties, corrosion and wear resistance, and long-term biocompatibility. Titanium and its alloys, stainless steels, and Co–Cr alloys have been the mostly preferred metallic biomaterials, though each exhibits significantly different mechanical performance in the body. Chemical composition, microstructure, or applied processing can significantly affect their performances. This chapter explains the phenomenon and mechanisms underlying the mechanical behavior of metallic biomaterials and induced biological responses. Methods to improve these properties are reviewed by referring to in vivo and in vitro examples. Failure of metallic implants and mechanisms leading to unsuccessful treatment are explained. Finally, future prospect of metallic biomaterials and manufacturing processes is discussed. © 2024 Elsevier Inc. All rights reserved.
  • Article
    Fatigue-Resistant Design of Carbon/Epoxy Composites Based on a Failure Tensor Polynomial Model by Particle Swarm Optimization-Sequential Quadratic Programming Algorithm
    (Sage Publications Ltd, 2024) Deveci, Hamza Arda; Artem, Hatice Secil; Guenes, Mehmet Deniz; Tanoglu, Metin
    This article introduces a design procedure to find the optimum fiber orientations of carbon/epoxy composite laminates for fatigue life advancement. The approach incorporates a fatigue failure tensor polynomial model and employs a hybrid algorithm, combining particle swarm optimization and sequential quadratic programming. Firstly, material properties of quasi-static and fatigue of the carbon/epoxy composites, fabricated by the vacuum-assisted resin transfer molding method, were determined to be used in the model. Various design problems involving two optimization scenarios were then solved using the hybrid algorithm. The algorithm's performance was also evaluated by specific test problems, confirming its speed and robustness. The optimally fiber-oriented carbon/epoxy composite laminates having maximum fatigue lives were obtained for many critical in-plane cyclic loading cases. To validate the proposed design procedure, two optimum designs were experimentally verified under uniaxial loading conditions. The results indicated a good correlation between the estimated fatigue life of the optimally designed laminates and experimental data. This methodology offers a promising approach for the design of carbon/epoxy composite laminates with superior fatigue strength, particularly significant in specific industrial applications.
  • Article
    Citation - WoS: 16
    Citation - Scopus: 22
    Optimum Design of Fatigue-Resistant Composite Laminates Using Hybrid Algorithm
    (Elsevier Ltd., 2017) Deveci, Hamza Arda; Artem, Hatice Seçil
    In this study, a fatigue life prediction model termed as Failure Tensor Polynomial in Fatigue (FTPF) is applied to the optimum stacking sequence design of laminated composites under various in-plane cyclic loadings to obtain maximum fatigue life. The validity of the model is investigated with an experimental correlation using the data available in the literature. The correlation study indicates the reliability of FTPF, and its applicability to different composite materials and multidirectional laminates. In the optimization, a hybrid algorithm combining genetic algorithm and generalized pattern search algorithm is used. It is found by test problems that the hybrid algorithm shows superior performance in finding global optima compared to the so far best results in the literature. After the verifications, a number of problems including different design cases are solved, and the optimum designs constituted of discrete fiber angles which give the maximum possible fatigue lives are proposed to discuss. A comparison study is also performed with selected design cases to demonstrate potential advantages of using non-conventional fiber angles in design.