Procedia Structural Integrity最新文献

{"title":"Assessment of multi-cracked non-uniform FGM beams using an equilibrium-based finite element formulation","authors":"H.A.F.A. Santos ,&nbsp;V.V. Silberschmidt","doi":"10.1016/j.prostr.2024.11.070","DOIUrl":"10.1016/j.prostr.2024.11.070","url":null,"abstract":"<div><div>A novel, simple and effective finite element formulation is introduced for the quasi-static analysis of functionally graded nonuniform Timoshenko beams with multiple and open concentrated cracks. This formulation relies on a complementary variational approach based on a set of approximations that satisfy all equilibrium conditions of the boundary-value problem in a strong form. As a result, this formulation is naturally free from the well-known shear-locking phenomenon. The effectiveness of the formulation is numerically demonstrated through its application to various problems, with the obtained results analysed and discussed.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"66 ","pages":"Pages 195-204"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143305600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prediction of Crack Path in Reinforced Concrete using Acoustic Emission Analysis","authors":"Vivek Vishwakarma ,&nbsp;Sonalisa Ray","doi":"10.1016/j.prostr.2024.11.089","DOIUrl":"10.1016/j.prostr.2024.11.089","url":null,"abstract":"<div><div>This paper presents a probability-based approach for predicting crack propagation in lightly reinforced concrete beams using acoustic emission techniques. A novel methodology combining Gaussian Mixture Model clustering and spatial binning is employed to simulate the crack path and plane. Experiments were conducted on notched lightly reinforced concrete beams under flexural loading, with AE data continuously recorded. GMM clustering was used to categorize AE events based on their average frequency and rise angle, enabling the selection of mode I crack events based on probability threshold. Then the filtered AE data was processed using a spatial and temporal binning strategy to simulate the evolving crack path. The predicted crack evolution in terms of path and length was validated against the results obtained from digital image correlation, demonstrating good agreement. This research highlights the effectiveness of acoustic emission technology, combining probabilistic clustering with spatial and temporal binning of AE data for real-time crack path prediction in reinforced concrete structures, offering valuable insights for structural health monitoring and damage assessment.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"66 ","pages":"Pages 381-387"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143306034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical study of the shock wave effect on tumour in bone tissue","authors":"Galina Eremina ,&nbsp;Alexey Smolin","doi":"10.1016/j.prostr.2024.11.014","DOIUrl":"10.1016/j.prostr.2024.11.014","url":null,"abstract":"<div><div>Cancer diseases significantly worsen the quality of life of people. Recent studies have shown that relatively small values of compressive stress over 40 kPa lead to growth and migration of cancer cells, while large amplitude can lead to tumour growth arrest. In this work, a mesomodel of a spherical cancer tumour placed in a cubic bone matrix was developed. The influence of loads on the stress-strain state (hydrostatic pressure) is analyzed. The working range of therapy shock wave treatment for stopping tumor growth without damaging surrounding tissues has been determined.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"65 ","pages":"Pages 92-96"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143157306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation of bioresorption of polymer matrixes for regenerative medicine","authors":"Polina Tyubaeva ,&nbsp;Ivetta Varyan ,&nbsp;Anatoly Popov","doi":"10.1016/j.prostr.2024.11.043","DOIUrl":"10.1016/j.prostr.2024.11.043","url":null,"abstract":"<div><div>The creation of modern biocompatible polymer structures with valuable functional properties based on biodegradable polymers allows us to propose new approaches to obtaining innovative materials to solve biomedical problems. However, the problem of choosing the optimal polymer matrices for regenerative medicine is acute. The work is aimed at expanding the boundaries of ideas about the modeling of bioresorption in various media and the role of supramolecular structure in these processes. Based on the DSC and GPС methods, it is possible to assess the contribution of the supramolecular structure of the polymer, in particular the degree of crystallinity and the state of the amorphous phase in bioresorption in a living organism and in a model environment.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"65 ","pages":"Pages 290-294"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The influence of small additives on the structure and properties of brass","authors":"A.V. Sulitsin ,&nbsp;S.V. Brusnitsyn ,&nbsp;D.O. Levin ,&nbsp;D.A. Usov ,&nbsp;V.K. Dubrovin","doi":"10.1016/j.prostr.2024.11.042","DOIUrl":"10.1016/j.prostr.2024.11.042","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The paper is devoted to research of the modifiers influence on the structure and properties of complex alloyed brass with a composition 70Cu-13Zn-7Mn-5Al-2Fe-2Si-1Pb. Mischmetal, magnesium-cerium, iron-boron, iron-titanium, niobium ligatures were used as modifiers. Laboratory and industrial experiments have been carried out. The macrostructure and microstructure of the ingots have been studied. The greatest effect on grain refinement was obtained using a magnesium-cerium ligature. It was found that when the magnesium-cerium ligature was introduced, there were no intermetallic accumulations, the average size of which did not exceed 80 μm. In order to facilitate the alloying of the modifier into the melt, it was proposed to use a nickel-magnesium-cerium alloy, since a significant amount of a fine fraction is formed during its production. The use of nickel-magnesium-cerium ligature as a modifier for complex alloyed brass is one of the possible options for using its fine fraction. The ligature amount was varied within 0.01...0.20 % of the melt mass. The experiments results showed that if the modifier amount increases, the average grain size decreases by more than two times. In this case, the average grain size does not change if the modifier amount is more than 0.1 wt. %. The influence of the modifier amount on the mechanical properties of complex alloyed brass has been studied. It was found that there is an increase in the ultimate tensile strength and elongation if a modifier is introduced in an amount of up to 0.05 wt. %. The dependence of hardness on the amount of the introduced modifier is determined. It has been found that the higher the added modifier amount, the higher the alloy hardness. The amount of the modifier is determined as 0.04...0.06 wt. %. It provides an increase in the level of mechanical properties of complex alloyed brass. Micro X-ray spectral analysis of the brass was carried out. The elements distribution in the α-phase, (α+β')-phase and intermetallic compounds in the test and control ingots structure has been studied. It was found that when the modifier is introduced in an amount of 0.05 wt. %, copper and zinc are present in significant amounts in the alloy structure in the α-phase and (α+β')-phase, and iron, silicon and manganese are present in the intermetallic compound. Industrial experiments were carried out using a modifier in an amount of 0.06 wt. %. The microstructure of the ingots has been studied. It has been established that when a modifier is added into the melt, the average area of intermetallic compounds in the alloy structure is 361 μm&lt;sup&gt;2&lt;/sup&gt;. This is almost two times less than the average area of intermetallic compounds in the structure of the alloy without a modifier introducing into the melt, which is 676 μm&lt;sup&gt;2&lt;/sup&gt;. The addition of a nickel-magnesium-cerium ligature in an amount of 0.06 wt. % to a complex alloyed brass with a composition 70Cu-13Zn-7Mn-5Al-2Fe-2Si-1Pb provides effective gri","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"65 ","pages":"Pages 282-289"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Full-scale strain gauge studies of structures under conditions of high temperatures and elastoplastic deformations","authors":"S.V. Maslov","doi":"10.1016/j.prostr.2024.11.022","DOIUrl":"10.1016/j.prostr.2024.11.022","url":null,"abstract":"<div><div>The features of full-scale strain gauge studies of structures operated at temperatures up to 550°C, in which local elastic-plastic deformations occur, are considered. A method for determining the creep of strain gauges based on measuring the output signals during cyclically varying deformation is considered. Algorithms for accounting for errors associated with the creep of strain gauges at nonstationary temperatures are proposed. An algorithm for calculating stresses based on measured deformations at variable elastic and elastic-plastic loading of the structure is determined.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"65 ","pages":"Pages 139-146"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143157490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of the influence of recrystallization annealing modes on the structure and properties of deformed aluminum alloy 2024","authors":"I.S. Kamantsev ,&nbsp;E.A. Putilova ,&nbsp;A.E. Trokhacheva ,&nbsp;K.E. Pervukhin ,&nbsp;N.A. Kalinina","doi":"10.1016/j.prostr.2024.11.017","DOIUrl":"10.1016/j.prostr.2024.11.017","url":null,"abstract":"<div><div>This paper presents the results of the combined use of the method for calculating the grain form factor and determining the microhardness in order to select a requested temperature range for recrystallization annealing of deformed aluminum alloy 2024. It is shown that at annealing temperatures above 400°C, the holding time has virtually no effect on the grain form factor of the aluminum alloy 2024. At annealing temperatures above 400°C, a uniform structure is formed with increased values of the hardness relative to the plastically deformed and initial state of the investigated alloy. It is also established that an increase of the holding time during recrystallization annealing allows for the formation of an equiaxed grain in the alloy at lower temperatures.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"65 ","pages":"Pages 109-113"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143157979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diagnosis of abrasive wear of steels by machine learning in Python","authors":"M.A. Skotnikova,&nbsp;A.Y. Ryabikin,&nbsp;A.D. Shestakov,&nbsp;L.D. Tuptei,&nbsp;A.D. Novokshenov","doi":"10.1016/j.prostr.2024.11.037","DOIUrl":"10.1016/j.prostr.2024.11.037","url":null,"abstract":"<div><div>Comparative tribotechnical tests of wear-resistant equal-hard steels of the martensitic class Hardox 450, Quard 450 in comparison with ferrite-pearlite steel 09G2S were carried out. The wear resistance “ε” increased in the direction of 1.0 → 7.9 → 18.1 in steels 09G2S → Hardox 450 → Quard 450, respectively. As it turned out, after testing for abrasive wear of samples made of Quard 450 steel with maximum wear resistance, traces of martensitic transformation were found on the friction sites. Using machine learning in Python, graphs of fluctuations of friction moments in time of the studied steels were constructed, their smoothing (averaging) by the Hannah method was carried out. The Fourier transform was performed, the amplitude-frequency characteristics of the friction moments were calculated and frequency spectrograms were constructed. It is shown that a decrease in the amplitude of the sinusoids of the first (main) harmonic occurred in the direction of 3.40 → 2.15 → 1.40 in steels 09G2S → Hardox 450 → Quard 450, respectively. Unlike the 09G2S and Hardox 450 steels, in the Quard 450 steel with maximum wear resistance, the second harmonic was split into two with amplitudes of 0.85 and 0.70. The spectra of two exciting forces (abrasive wear and structural-phase (martensitic) transformation) were found in it, strengthening the surface in the contact zone and increasing its wear resistance.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"65 ","pages":"Pages 248-254"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143158071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Finite element analysis of JCO-E fabrication process and its influence on the collapse capacity of offshore pipelines","authors":"Ilias Gavriilidis ,&nbsp;Aris G. Stamou ,&nbsp;Konstantinos Antoniou ,&nbsp;Spyros A. Karamanos","doi":"10.1016/j.prostr.2024.06.040","DOIUrl":"10.1016/j.prostr.2024.06.040","url":null,"abstract":"<div><p>In the present work, the JCO-E fabrication process is numerically simulated using advanced finite element tools for the case of a thick-walled 30-inch-diameter pipe, which is candidate for deep water installation. Subsequently, the structural performance of the line pipe under external pressure is investigated in a unified approach. Uniaxial tests are performed to obtain the material properties used in the finite element model, which are representative of the loading history that the plate is subjected during the process. The finite element model is validated with geometric measurements from the actual pipe fabricated in the pipe mill. The effect of the expansion level on the properties of the final product is investigated through extensive numerical studies. The results have shown that there exists an optimum expansion range for achieving the minimization of the geometric imperfections of the final product and the maximization of the collapse capacity of the pipe.</p></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"61 ","pages":"Pages 315-321"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2452321624005778/pdf?md5=044f37513030645ff55bcabea0f2a940&pid=1-s2.0-S2452321624005778-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141954474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of mechanical properties of 3D-printed ABS, PA12 and PET-G reinforced with short fiber","authors":"Artem Pepeliaev ,&nbsp;Evgenii Lobov ,&nbsp;Ilia Vindokurov ,&nbsp;Mikhail Tashkinov","doi":"10.1016/j.prostr.2024.06.029","DOIUrl":"10.1016/j.prostr.2024.06.029","url":null,"abstract":"<div><p>This work investigates the mechanical properties of short carbon and glass fiber-reinforced additively manufactured acrylonitrile butadiene styrene (ABS), nylon (PA12) and polyethylene terephthalate glycol (PET-G). The samples were manufactured using the fused filament fabrication technique. The mechanical properties of samples made of reinforced filaments were compared to those made of pure polymeric materials in uniaxial tensile tests. The elastic modulus, tensile strength and resilience were determined. Samples reinforced with short fiber showed an increase in strength characteristics compared to pure material. The influence of the diameter of the nozzle used for samples manufacturing on their mechanical characteristics and was established.</p></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"61 ","pages":"Pages 224-231"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2452321624005663/pdf?md5=0f03498df67fa5b07ca71d2a9989ee4f&pid=1-s2.0-S2452321624005663-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141954509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}