Procedia Structural Integrity最新文献

{"title":"Study of Geometric Interference Parameters on the Stress Distribution and Fatigue Crack Growth in Pin Loaded Lug Joint","authors":"Abdul Khader Jilani Shaik,&nbsp;Raghu V Prakash","doi":"10.1016/j.prostr.2025.08.007","DOIUrl":"10.1016/j.prostr.2025.08.007","url":null,"abstract":"<div><div>Lug-Bush-Pin joints are extensively used in almost all the disciplines of mechanical engineering design as structural members. Due to their simplicity and highly efficient load-bearing characteristics, lug joints are extensively used in aircraft for the attachments of flaps, ailerons, and engine pylons. These joints are sensitive to fatigue and hence their fatigue strength dictates the life of the entire structure. In the current study, a typical lug and bush are joined through an interference fit and the pin is considered to be snugly fit initially in the assembly. Interference level varying from 0.1 to 0.5% of bush diameter was considered for the lug-bush interface. Wear of pin is generally allowed by design resulting in pin-bush clearance, which in turn can affect the stress distribution of the joint. Typical clearances ranging from 0.1 to 0.5% of pin diameter were considered. The joint was analyzed for static and fatigue performance using a nonlinear elastic-plastic finite element analysis. A total of 56 geometric cases, involving clearance of bush with the lug in combination with snug fit pin and varying levels of clearance fit at the pin were examined. The fatigue life is estimated for each of the bush-pin fit combinations. Unstructured Mesh Method (UMM) and Separating, Morphing, Adaptive, and Re-meshing Technology (SMART) are employed to ascertain Fatigue Crack Growth analysis. The results suggest a good correlation with analytical solutions within the 2.5% variation of accuracy. Fatigue crack growth rate response was also studied for the bush and Pin joint at the locations of high-stress.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"71 ","pages":"Pages 42-49"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144902532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strain-induced martensite formation during punching of a medium manganese advanced high-strength steel","authors":"Pekka Kantanen,&nbsp;Pekka Plosila,&nbsp;Vahid Javaheri,&nbsp;Tuomas Perkiö,&nbsp;Antti Kaijalainen","doi":"10.1016/j.prostr.2025.07.008","DOIUrl":"10.1016/j.prostr.2025.07.008","url":null,"abstract":"<div><div>Partitioning of carbon and manganese during intercritical annealing of medium manganese steels is known to enhance the thermal stability of austenite by retarding the transformation to martensite during cooling, thereby promoting the retention of austenite at room temperature. The presence of retained austenite (RA) is particularly crucial in high-strength steel applications that demand an optimal balance between strength and ductility. This study investigates the mechanical stability of RA and the strain-induced martensitic transformation in a medium manganese advanced high-strength steel during the punching process. A vacuum-cast steel with a composition of 0.3C–1Si–6Mn–2Al (in wt.%) was laboratory hot-rolled to a thickness of 4 mm. Subsequently, the intercritical annealing treatments (IAT) were carried out at temperatures of 650 °C and 700 °C to stabilize varying RA fractions within a tempered martensite/ferrite matrix. The tensile strengths of 1027 MPa and 911 MPa were obtained for microstructures with RA fractions of 7.5% and 43.3% at IAT temperatures of 650 °C and 700 °C, respectively. Significant differences in strain hardening of the material were observed near the punched hole edges. The IAT 700 °C material exhibited higher maximum hardness near the edge, and a greater depth of the shear-affected zone compared to the IAT 650 °C material. This indicates that strain-induced martensitic transformation under the localized deformation during the punching process is a key factor in increasing edge hardness value of the punched IAT materials. Notably, the transformation behaviour of austenite during tensile testing differed from that observed during punching, due to variation in material flow, deforming mode and localized strain.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"69 ","pages":"Pages 53-60"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144587891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvement of Mechanical Behaviour in B doped Ni3Ta based High Temperature Shape Memory Alloy","authors":"Carlo Alberto Biffi,&nbsp;Jacopo Fiocchi,&nbsp;Jannis Nicolas Lemke,&nbsp;Alberto Coda,&nbsp;Ausonio Tuissi","doi":"10.1016/j.prostr.2025.07.009","DOIUrl":"10.1016/j.prostr.2025.07.009","url":null,"abstract":"<div><div>Shape memory alloys (SMAs) able to exhibit the martensitic transformation (MT) at high temperature (above 100°C) are very attractive smart materials for some industrial sectors, such as automotive and aerospace ones. Their main issues regard the brittleness, limiting their processing, and the unstable functionality upon thermal cycling. In this work, the effect of B addition (0.8% in atomic percentage) in the place of Ni and Ta in Ni3Ta SMA on the MT, microstructure and mechanical properties is studied. It is found that the MT occurs above 200°C and its thermal stability can be reached after few thermal cycles. The addition of B in limited amount does not suppress the MT and it improves the mechanical properties in compression, reducing the cracking behavior in comparison to the binary alloy.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"69 ","pages":"Pages 61-68"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144587892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of anchor’s inclination angle on the flexural enhancement of CFRP-strengthened RC beams","authors":"Maha Assad ,&nbsp;Rami Hawileh ,&nbsp;Jamal Abdalla","doi":"10.1016/j.prostr.2025.06.050","DOIUrl":"10.1016/j.prostr.2025.06.050","url":null,"abstract":"<div><div>Carbon fiber-reinforced polymers (CFRP) spike anchorage systems demonstrated positive outcomes in mitigating debonding of CFRP sheets in externally strengthened reinforced concrete (RC) beams. This study aims to investigate the effect of inclination angle of the CFRP spike anchors dowel on the flexural behavior of strengthened and end-anchored RC beams. Three concrete beams having a length, depth, and width of 2000, 250, 200 mm, respectively, were tested under a four-point bending test. The first beam was strengthened and unanchored, and the other two beams were strengthened and anchored with vertical (θ=90°) and inclined CFRP anchors at an angle of 135° on each side, respectively. The dowel’s diameter of the anchors used in this study is 14 and 20 mm, respectively. Results showed that the failure observed in the beam having inclined anchors was unfavorable. An abrupt separation in the concrete cover occurred that was even more brittle than the unanchored beam. Moreover, the percentage increase in flexural strength of the beam with inclined anchors was 23% with respect to the unanchored beam, compared to an increase of 40% demonstrated by the beam with vertical anchors. Therefore, it can be concluded that using inclined anchors is not recommended in strengthened RC beams for flexure.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 252-258"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Production of aluminum cellular solids, mechanical characterization through compression tests and correlation with image analysis","authors":"A. Ceci ,&nbsp;G. Costanza ,&nbsp;C. Iandiorio ,&nbsp;E. Marotta ,&nbsp;P. Salvini ,&nbsp;M.E. Tata","doi":"10.1016/j.prostr.2025.06.068","DOIUrl":"10.1016/j.prostr.2025.06.068","url":null,"abstract":"<div><div>This study explores the production and successive mechanical characterization of metallic lattice structures. Mechanical characterization was carried out through compression tests. Rectangular AA6082 cross-section specimens, manufactured utilizing a unit cell design featuring two different cell fill factors, were produced using the Lost PLA method. The process entailed creating a PLA model using 3D printing, which was subsequently transformed into structures made from AA6082 aluminum alloy through casting techniques. Static compression tests were conducted on manufactured samples, on which a numerical (FEA) comparison modelling was performed. The mechanical behavior of the lattice structures was also analyzed using two image analysis methods: Digital Image Correlation and Discrete Fourier Transform.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 372-378"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance of Electro-Mechanical Impedance Technique for Detection of Moderate and Severe Damages","authors":"Anubhav Kumar Singh ,&nbsp;Hemant Singh Parihar ,&nbsp;Rama Shanker","doi":"10.1016/j.prostr.2025.07.092","DOIUrl":"10.1016/j.prostr.2025.07.092","url":null,"abstract":"<div><div>As buildings and structures get older, they start to wear down, which is a significant concern worldwide. Detecting damage early and measuring its extent are crucial for safety, preventing substantial failures, and extending the life of structures through repairs or upgrades. One efficient method for this purpose is the electro-mechanical impedance technique, which makes use of piezoelectric sensors. This technique operates in a high frequency range and can detect minor damage. This study examines how well the EMI method using PZT patches as actuators and sensors can detect moderate and severe damage in structures. The main focus of this study is to assess damage based on the EMI technique’s impedance signature using a PZT patch and an LCR meter. PZT transducers create stress waves that move through the structure, and any changes in these waves indicate damage. To find the level of damage, the Root Mean Squared Deviation method was employed to calculate the differences in the electrical properties of a structure and its healthy state. Experiments were carried out to simulate various levels of damage on a 500 x 100 x 100 mm beam under controlled conditions. Artificial damage that ranged from incipient to severe was introduced, and responses were recorded in terms of admittance (conductance and susceptance). The percent change of equivalent stiffness and equivalent mass was calculated. Based on the change in these parameters, classification of moderate and severe damage was done. Moderate damage involved significant changes in stiffness and mass, reflecting a large effect on the structural properties of the system. Severe damage, on the other hand, resulted in a small drop in stiffness and only minor changes in mass, reflecting that the structural response had reached a threshold where further deterioration did not significantly affect these parameters. In addition, the RMSD rose in an increasing manner with the severity of damage, indicating a greater degree of deviation in dynamics as the level of structural deterioration increased. The impedance signature correlation with these structural changes validated the reliability of this technique. In general, this method not only detects the initial development of structural damage but also differentiates its severity, and thus it is a sound tool for real-time structural health inspection.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"70 ","pages":"Pages 572-579"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144878824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigation of the influence of fastening screw spacing in OSB sheathing on the stiffness of shear walls in light steel framing systems","authors":"Milena Carolina Derlam ,&nbsp;Ramon Mendonça Teles ,&nbsp;Vinicius De Kayser Ortolan ,&nbsp;Daiana Cristina Metz Arnold","doi":"10.1016/j.prostr.2025.07.019","DOIUrl":"10.1016/j.prostr.2025.07.019","url":null,"abstract":"<div><div>The growing demand for innovation in the Brazilian construction industry, driven by the housing deficit and the need for optimization, highlights Light Steel Framing (LSF) as an efficient solution. However, its acceptance in Brazil is limited due to the lack of technical parameters for structural design and numerical modeling, especially regarding the use of Oriented Strand Board (OSB) panels. The use of slender Cold-Formed Steel (CFS) results in greater horizontal displacement of structures due to wind or even seismic forces, requiring efficient bracing systems for shear walls. Therefore, this study aims to analyze, through computational simulation, the influence of the fastening screw spacing of OSB panels in shear walls within the LSF system, with OSB sheathing on both sides. The analysis was performed using Abaqus CAE (2024) to model the panels, varying the spacing of the fastening screws in the OSB sheathing. The results demonstrate that the model with the smallest screw spacing of 75 mm exhibited the best performance, reaching a maximum force of 39.26 kN, a displacement of 29.83 mm, and an elastic stiffness of 1.38 kN/mm. The increasing of the screw spacing to 100 mm and 150 mm resulted in a 3.8% and 24.8% reduction in maximum force, respectively, and consequently led to a 38.8% and 54.6% reduction in elastic stiffness. It is concluded that the structural resistance of the panels is strongly influenced by screw spacing, with a small space between the fasteners contributing to an increase in resistance and lateral stiffness of the panels.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"70 ","pages":"Pages 3-10"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144878902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental investigations on looseness in beam-to-upright connections of CFS storage racks","authors":"Umeshkumar T. Mourya ,&nbsp;S. Arul Jayachandran","doi":"10.1016/j.prostr.2025.07.023","DOIUrl":"10.1016/j.prostr.2025.07.023","url":null,"abstract":"<div><div>This paper presents an experimental investigation into the looseness observed in boltless beam-to-upright connections of cold-formed steel storage racks. These connections, formed by tab-insertion mechanisms, are inherently semi-rigid and prone to looseness due to oversize perforations in the uprights, resulting in discontinuities in their structural response under cyclic loading. A total of twelve connection configurations with variations in upright, beam and end-connector geometries were evaluated through single cantilever bending tests as recommended by EN15512. The tests involved alternating sagging and hogging moments to simulate reversal loading conditions, and the looseness was quantified by measuring relative displacements in the connection. Results demonstrated that looseness values ranged from 0.005 to 0.028 radians, correlating to imperfection amplitudes between 1/200 and 1/35. The number of tabs in the end-connector, as well as upright thickness and geometry, significantly influenced the looseness. The study highlights the importance of accounting for connection looseness in rack frame design, as even minor geometric variations can substantially affect connection behavior.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"70 ","pages":"Pages 35-42"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144878906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Behaviour of Masonry Walls Under Combined Compression and Shear Loading: 3D Failure Analysis","authors":"Chaitra Shree V. ,&nbsp;Sahana T.S. ,&nbsp;Raveesh R.M. ,&nbsp;Sowjanya G.V.","doi":"10.1016/j.prostr.2025.07.027","DOIUrl":"10.1016/j.prostr.2025.07.027","url":null,"abstract":"<div><div>This study investigates the nonlinear behaviour and failure mechanisms of masonry infill walls subjected to combined axial compression and lateral shear loading. Using the Drucker-Prager plasticity model within ANSYS Workbench, a 3D finite element model of a reinforced concrete (RC) frame with masonry infill was developed. The simulation focused on crack initiation, propagation, and ultimate load-bearing capacity. Results revealed initial stiffness due to confinement, followed by diagonal shear cracking as the dominant failure mode. The finite element analysis showed good agreement with analytical estimations, with a deviation of only ±6% in peak shear capacity. Contour plots of equivalent plastic strain and stress trajectories highlighted the development of tension-induced cracks and residual strength, emphasizing the role of RC confinement. The study validates the Drucker-Prager model for simulating pressure-sensitive masonry behaviour and offers insights into stress redistribution and damage evolution under complex loading. These findings contribute to performance-based design, retrofitting strategies, and structural assessments of masonry-infilled frames under seismic or lateral forces. Future work may incorporate cyclic or probabilistic modelling for enhanced accuracy in real-world applications.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"70 ","pages":"Pages 67-73"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144878910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigation of 4-point bend test of thin-walled regular hexagonal CFST beam","authors":"Oberoi Kabrambam ,&nbsp;Khwairakpam Sachidananda","doi":"10.1016/j.prostr.2025.07.028","DOIUrl":"10.1016/j.prostr.2025.07.028","url":null,"abstract":"<div><div>Concrete-filled steel tube (CFST) is a composite structural member composed of a steel tube and concrete in which concrete is filled inside the steel tube. CFST beam has been studied by different researchers for different shapes like square, rectangular, circular, elliptical etc. for their flexural performance. Study on 4-point bend test of thin walled regular hexagonal CFST beam for single skin by changing its strength of concrete from 20 MPa to 35 MPa using ABAQUS software has not been done so far. The finite element analysis (FEA) model has been validated using experimental data of square and rectangular CFST beam from existing literature. In the model, nonlinear material properties of steel, contact interactions, and geometric influences are taken into account so as to get the perfect model. The current paper studied the performance of hexagonal shaped CFST beam for different strength of concrete with the variation from 20 MPa to 35 MPa and steel thickness(t) = 2.5mm which comes under class 4 section of Eurocode 3 (Part 1-4). The ultimate moment capacity of the beam increases by 6.33%, 6.84%, 5.78% when the strength of concrete increases from 20 to 25, 25 to 30, 30 to 35 MPa respectively. It has been found that steel yields more in the bottom part of the CFST beam when lower strength of concrete is used comparing to higher strength of concrete. Local buckling could be observed in bending test of thin-walled hexagonal CFST beam.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"70 ","pages":"Pages 74-81"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144878911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}