International Journal of Adhesion and Adhesives最新文献

{"title":"Mechanical and fracture behaviour of epoxy polymer under extreme low temperature and high strain rate conditions","authors":"Palak Bhagoria,&nbsp;Muddu Rahul Bharadwaj,&nbsp;Rohit Kumar,&nbsp;Kuldeep Yadav,&nbsp;Vikrant Tiwari","doi":"10.1016/j.ijadhadh.2025.104039","DOIUrl":"10.1016/j.ijadhadh.2025.104039","url":null,"abstract":"<div><div>Low-temperature studies are crucial in material science, cryogenic, and aerospace engineering, where materials endure extreme temperatures. High strain rate loading at low temperatures significantly affects material performance and integrity. This article investigates the dynamic mechanical response of EPOFINE®-1564, a Bisphenol-A-based liquid epoxy resin, using Split Hopkinson Pressure Bar (SHPB) and Modified Hopkinson Pressure Bar (MHPB) at high strain rates. An in-house built liquid nitrogen environment chamber was used to attain low temperatures. Dynamic experiments under compressive loading were conducted at strain rates of 710–2051 s⁻¹ and temperatures between −120 °C and −25 °C, while under tensile loading, the experiments were performed at strain rates of 1125–2194 s⁻¹ and temperatures between −70 °C and −40 °C. The results revealed an increase of strength and stiffness by 12.3 % and 16.66 %, respectively, for compressive loading with a decrease in temperature from −25 °C to −120 °C. Similarly, these properties increased by 9.28 % and 2.6 % for tensile loading with the decrease in temperature from −40 °C to −70 °C. Additionally, MHPB was employed to investigate the fracture behaviour of the epoxy resin under dynamic loading (6 m/s – 12 m/s) using Three-Point Bend (TPB) specimens. High-speed imaging and 3D Digital Image Correlation (DIC) revealed that dynamic fracture toughness decreased with temperature, weakening intermolecular interactions, and reducing crack resistance. Analyzing the fracture surface using scanning electron microscopy revealed the disappearance of stretch zones and crazes as brittleness increased with decreasing temperature.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"140 ","pages":"Article 104039"},"PeriodicalIF":3.2,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143886485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fatigue fracture mechanisms and strength improvement of epoxy adhesive joints with surface Treatment: An integrated experimental and molecular dynamics study","authors":"Masayoshi Ogawa ,&nbsp;Akihiro Shinozaki ,&nbsp;Yuichi Hosoya ,&nbsp;Jiayue Hu ,&nbsp;Akio Yonezu ,&nbsp;Ling Liu","doi":"10.1016/j.ijadhadh.2025.104040","DOIUrl":"10.1016/j.ijadhadh.2025.104040","url":null,"abstract":"<div><div>In recent years, enhancing the long-term reliability of adhesive bonding has become crucial for the innovative design of multi-material structures aimed at reducing the structural weight of transportation systems. As a result, it is essential to elucidate the mechanisms behind fatigue fracture and propose methods to improve the fatigue strength of adhesive joints. Surface modification of the adherend in adhesive joints has shown great promise in significantly increasing fatigue strength by promoting stable fracture, specifically cohesive fracture. This study experimentally demonstrates an increase in the fatigue strength of adhesive joints through the application of silane coupling agent (SCA) treatment, resulting from enhanced chemical bonding at the adhesive interface. Molecular dynamics (MD) simulations were employed to model the various cross-linking reactions occurring at the resin/SCA/alumina interface, revealing how SCA modifies the interface at the atomistic level. The MD simulation further elucidates the fatigue fracture mechanisms of adhesive joints within the epoxy resin during cyclic loading, with a particular focus on the void-induced cracking as well as void growth and coalescence under the high- and low-stress fatigue conditions, respectively.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"140 ","pages":"Article 104040"},"PeriodicalIF":3.2,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143917518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A facile strategy for fabricating high-temperature soybean meal–based adhesive with reduced viscosity, prolonged open time, and improved water resistance","authors":"Yuqian Wang ,&nbsp;Yongjian Wei ,&nbsp;Shuangying Wei ,&nbsp;Zhenhua Gao ,&nbsp;Chengsheng Gui","doi":"10.1016/j.ijadhadh.2025.104038","DOIUrl":"10.1016/j.ijadhadh.2025.104038","url":null,"abstract":"<div><div>Soybean-based adhesives fabricated from high-temperature soybean meal (HTSM) have a lower cost but significantly shorter open time and much higher viscosity than the commercial adhesives using low-temperature soybean meal (LTSM). This still limits their wide commercial applications. In this study, fresh soybean meal (FSM) was partially substituted for HTSM, effectively prolonging open time and reducing the viscosity of HTSM-based adhesive without compromising bonding performance. This improvement was mainly attributed to the synergistic interactions between undenatured soybean proteins and hydrophobic soybean oil (SO) present in FSM. Due to less water loss and fewer cross-linkages caused by heat-induced denaturation, the undenatured proteins can obviously reduce viscosity and prolong open time in HTSM-based adhesives. Additionally, the hydrophobic SO with its small molecular weight can inhibit water absorption by HTSM and act as a lubricant, thereby prolonging open time and reducing viscosity to some extent. The optimized HTSM-based adhesive, with 34.3 % FSM addition, exhibited a 91 % reduction in viscosity, an 89 % increase in open time, and a 17.6 % improvement in soaked wet strength (1.27 MPa). Therefore, adding FSM provides a facile strategy for effectively prolonging open time and reducing the viscosity of HTSM-based adhesives, making their performance comparable to commercial LTSM-based adhesives.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"140 ","pages":"Article 104038"},"PeriodicalIF":3.2,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Catechin-doped universal adhesive system: Physicochemical characterization and resin-dentin bonding stability","authors":"Nadine Luísa Albuquerque Guimarães ,&nbsp;Cecília Atem Costa ,&nbsp;Jiovanne Rabelo Neri ,&nbsp;Ana Laura Mendes Mota ,&nbsp;Marcelo Victor Sidou Lemos ,&nbsp;Juliano Sartori Mendonça ,&nbsp;Sérgio Lima Santiago","doi":"10.1016/j.ijadhadh.2025.104037","DOIUrl":"10.1016/j.ijadhadh.2025.104037","url":null,"abstract":"<div><h3>Objectives</h3><div>To evaluate the influence of EGCG on the physicochemical properties of a universal adhesive and the stability of the resin-dentin interfaces.</div></div><div><h3>Methods</h3><div>An experimental adhesive was obtained by adding 0.1 % EGCG w/w to Single Bond Universal. Adhesive specimens were assayed following ISO recommendations for flexural strength, water sorption and solubility experiments. The degree of conversion (DC) was analyzed by FTIR. Data were statistically analyzed using a T-test (p &lt; 0.05). Subsequently, the teeth were randomly allocated to four groups (n = 9): controls (ER and SE) and experimentals (ER-EGCG and SE-EGCG), prepared to bonding and sectioned to obtain bonded sticks to test in the universal machine immediately, after 6 and 12 months. Mean μTBS values were subjected to two-way ANOVA and Student-Newman-Keuls test (p &lt; 0.05). Dentin micropermeability and interfacial nanoleakage were assessed using a confocal-laser scanning microscope and scanning electron microscope.</div></div><div><h3>Results</h3><div>EGCG-dopped adhesive showed higher values of modulus of elasticity (ME) (p &lt; 0.05) and lower values of WS (p &lt; 0.05). After 24 h, mean bond strength values were not significantly different among all groups (p &gt; 0.05). The SE-EGCG showed higher mean bond strength value when compared to control at 12 months of storage (p &lt; 0.05). CLSM technique and nanoleakage expression showed better results in SE groups.</div></div><div><h3>Conclusion</h3><div>EGCG does not affect the physicochemical properties of SBU and presents a positive effect on bond strength when used in the SE strategy, which could improve the durability of the dentin-resin bond over time.</div></div><div><h3>Clinical significance</h3><div>EGCG incorporated into a universal adhesive for inhibition of hybrid layer degradation does not present a negative effect on the physicochemical properties of the adhesive system.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"140 ","pages":"Article 104037"},"PeriodicalIF":3.2,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Adhesive properties of universal adhesives systems containing zinc oxide and copper nanoparticles on sound dentine: A 2-year evaluation” [Int J Adhesion Adhesiv 140 (2025) 1–9 104023]","authors":"Mario Felipe Gutiérrez ,&nbsp;Aliaga-Gálvez Romina ,&nbsp;Pardo-Diaz Carolina ,&nbsp;Alejandra Nuñez ,&nbsp;Sofía Cavagnaro ,&nbsp;Rocío Maturana ,&nbsp;Alessandra Reis ,&nbsp;Eduardo Fernández ,&nbsp;Alessandro D. Loguercio","doi":"10.1016/j.ijadhadh.2025.104036","DOIUrl":"10.1016/j.ijadhadh.2025.104036","url":null,"abstract":"","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"140 ","pages":"Article 104036"},"PeriodicalIF":3.2,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The latest research progress of polyurethane modified asphalt binder: synthesis, characterization, and applications","authors":"Jinyuan Lu ,&nbsp;Shaofeng Xu ,&nbsp;Chuanqiang Li ,&nbsp;Chaoliang Fu ,&nbsp;Mengjie Gao ,&nbsp;Zhimei Wang ,&nbsp;Fan Yang ,&nbsp;Gang Zhou ,&nbsp;Rukai Li ,&nbsp;Tianqing Ling","doi":"10.1016/j.ijadhadh.2025.104035","DOIUrl":"10.1016/j.ijadhadh.2025.104035","url":null,"abstract":"<div><div>Polyurethane (PU) is widely used in the automotive, furniture, and aviation industries. Recently, an increasing number of researchers used PU as a modifier for asphalt pavement modification due to its excellent wear resistance, high-low temperature performance and elasticity. Herein, the latest research progress of PU modified asphalt (PUMA) was reviewed through the following aspects: The preparation process of PU and PUMA; Analyzes the mechanism of polyurethane modified asphalt from a microscopic point of view; The use of molecular dynamics simulation to study the performance of polyurethane modified asphalt. The use of PU as a modifier, such as PU emulsified asphalt, PU foam asphalt, PU recycled asphalt, PU solid-solid phase change asphalt, bio-based PU-modified asphalt, self-repairing PU-modified asphalt; The use of PU and other modifiers composite modify asphalt. For example, PU/nano-materials, PU/SBS, PU/epoxy resin, and PU/warm mix additive modified asphalt; The use of PUMA in tunnels, bridge deck pavements, functional pavements, and special scenarios for crack and pothole maintenance. Furthermore, the challenges and future trends in PU-modified asphalt were reviewed drawing on current research findings.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"140 ","pages":"Article 104035"},"PeriodicalIF":3.2,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143845096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The interaction of focused ultrasound and dentin: Thermal, structural and chemo-mechanical characterization","authors":"Cheryl Fu ,&nbsp;Sheetal M. Rajan ,&nbsp;Mohamed M. Awad ,&nbsp;Wanlu Ouyang ,&nbsp;Peta L. Clode ,&nbsp;Amr S. Fawzy","doi":"10.1016/j.ijadhadh.2025.104033","DOIUrl":"10.1016/j.ijadhadh.2025.104033","url":null,"abstract":"<div><h3>Objective</h3><div>This laboratory study aimed to develop an <em>ex vivo</em> model simulating pulpal micro-circulation to characterize temperature variations within the pulpal space following high intensity focused ultrasound (HIFU) exposure. In addition, to assess the interaction and effect of HIFU exposure parameters on human dental pulp stem cells (hDPSCs) response and the variations in dentin surface microstructure and chemo-mechanical characteristics.</div></div><div><h3>Methods</h3><div>Thermal camera mapping and intra-pulpal temperature measurements with thermocouples were conducted (continuous measurement of 60 s) at HIFU intensities of 20 and 25 W with varying active-duty ratios. hDPSCs tolerance and viability were assessed via acid-phosphatase assay and live/dead fluorescence imaging. Subsequently the effect of HIFU exposure on the structure, chemical composition and nano-mechanical properties of dentin was characterised by scanning electron microscopy, atomic force microscopy, transmission electron microscopy, Raman spectroscopy and nano-indentation testing.</div></div><div><h3>Results</h3><div>Thermal analyses revealed two potentially thermally favourable HIFU exposure parameters: 20 W and 25 W at active-duty ratio of 1/6 ms. The two identified HIFU parameters were further investigated at 30 and 60 s treatment time on dentin surface. HIFU treatment did not result in statistically detrimental effects on the viability of hDPSCs (p &gt; 0.05). HIFU treatment for 60 s effectively removed the overlying smear layer exposing dentin-tubules orifices and partial revealed collagen fibril's structure. No significant change in roughness or chemical composition (960/1450 cm⁻¹ mineral/organic ratio) was detected after HIFU treatment (p &gt; 0.05). However, HIFU treatment at 25 W for 60 s resulted in a significant decrease (p &lt; 0.05) in surface hardness compared to sound dentin.</div></div><div><h3>Significance</h3><div>HIFU treatment at 25 W for 60 s demonstrates effective removal of the dentin smear layer and partial exposure of dentin collagen fibrils without significantly altering the dentin chemical composition without adversely affecting the underlying hDPSCs.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"140 ","pages":"Article 104033"},"PeriodicalIF":3.2,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanism of improving the shear strength of EVA hot melt adhesives by fumed silica and microsilica powder","authors":"Congyun Shi ,&nbsp;Bilian Chen ,&nbsp;Danjun Wang ,&nbsp;Daolei Zhang","doi":"10.1016/j.ijadhadh.2025.104030","DOIUrl":"10.1016/j.ijadhadh.2025.104030","url":null,"abstract":"<div><div>Modification of EVA hot melt adhesives by using inorganic powder is a common method to improve the mechanical properties of hot melt adhesives. In this paper, porous fumed silica with large specific surface area and solid non-porous microsilica powder with small specific surface area were added to EVA hot melt adhesives respectively. The magnitude of the enhancement of the shear strength of EVA hot melt adhesives was explored, and the mechanisms that the two kinds of powders enhance the shear strength were investigated by XPS, ATR-IR, ¹HNMR, FE-SEM and DSC. The addition of fumed silica increased the shear strength of the composite hot melt adhesives, and reached the maximum value when the powder content was 2 %, which increased by about 14.3 % compared with pure EVA hot melt adhesives. Through XPS, ATR-IR and ¹HNMR it was found that the Si-OH on the surface of SiO₂ particles reacted with the ester carbonyl group in EVA to produce polymer alcohol, and the strong polar hydroxyl group on the surface of SiO₂ was changed to an acyl oxygen group. The acylation of the particles surface is conducive to reducing the agglomeration of SiO₂ particles and improving the compatibility between inorganic particles and organic polymers. The composite hot melt adhesive with 1 %, 2 %, and 3 % fumed silica content shows slight agglomeration of inorganic powder, while the agglomeration is significantly severe when the content is 4 %. DSC analysis showed that the crystallinity of EVA composite hot melt adhesives decreased first and then increased with the increase of powder content, and the decrease of crystallinity increased the shear strength. The improvement of the shear strength can be attributed to the enhancement of the compatibility caused by the reaction between fumed silica and EVA organic, as well as the decrease in crystallinity. The addition of microsilica powder improved the shear strength of the composite hot melt adhesives also, and the maximum value was reached when the powder content is 25 %, which was about 10.6 % higher than that of pure EVA hot melt adhesives. The increase amplitude is smaller than that of fumed silica. The reaction between microsilica powder particles and EVA pure hot melt adhesives was not found by XPS and ATR-IR detection, however, the ¹HNMR spectrum showed that there is a partial reaction between them, the degree of reaction was less than that between fumed silica and EVA hot melt adhesive. The crystallinity also showed a trend of first decreasing and then increasing with the increase of powder addition, with the minimum crystallinity at 10 %. The enhancement of the shear strength of hot melt adhesives by microsilica powder may be mainly attributed to the decrease in crystallinity.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"140 ","pages":"Article 104030"},"PeriodicalIF":3.2,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization design and curing behaviors of polyurethane (PU) modified asphalt from the perspective of cohesion-adhesion variations","authors":"Jianhua Yang ,&nbsp;Ke Zhang ,&nbsp;Yuanyuan Wang ,&nbsp;Fei Zhou ,&nbsp;Zhongnan Tian","doi":"10.1016/j.ijadhadh.2025.104034","DOIUrl":"10.1016/j.ijadhadh.2025.104034","url":null,"abstract":"<div><div>Interface properties of asphalt and aggregate intimately affect the service-performance and durability of asphalt pavement. The research aimed to explore the cohesion-adhesion characteristics of polyurethane (PU) modified asphalt, and thus optimizing its constituent proportion and understanding its curing behaviors. To this end, several proportion schemes of PU modified asphalt were first designed with response surface methodology (RSM), and the corresponding asphalt binders were prepared and their cohesion-adhesion features were characterized based on contact angle test and thermodynamic theory. On this basis, the effects of composition ratio and its interactions on the cohesion-adhesion features were analyzed and the optimal composition ratio was determined. Lastly, the adhesion features of PU modified asphalt during its curing period were measured using pull-out test and atomic force microscopy (AFM), and thus the curing behaviors were expounded. The results showed that the composition-associated factors had interactive impacts on the cohesion and adhesion of PU modified asphalt, wherein the influence of PU prepolymer on the adhesion was more significant as the curing agent was incorporated at the high ratio. Further, the increase of compatibilizer and diluent adversely affected the cohesion-adhesion capacity of PU modified asphalt, and for obtaining the favorable cohesion-adhesion competence, the optimal constituent proportion was determined as PU prepolymer: curing agent: compatibilizer: diluent = 14: 1.80: 1.88: 3.12. During the curing process, the adhesion performance and microscopic phase structure of PU modified asphalt exhibited the character of an initially visible ascending variation followed by a tendency to stabilize, and the eventual adhesion properties were not related to the solidification temperature set in the research. The research is of great significance for guiding the development of PU modified asphalt with satisfactory interfacial properties and understanding its curing process.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"140 ","pages":"Article 104034"},"PeriodicalIF":3.2,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flaw classification in bonded joints using multivariate statistical analysis and artificial intelligence","authors":"Carlos Tais ,&nbsp;Juan M. Fontana ,&nbsp;Leonardo Molisani ,&nbsp;Ronald O'Brien ,&nbsp;Yolanda Ballesteros ,&nbsp;Raquel Caro Carretero ,&nbsp;Juan C. del Real-Romero","doi":"10.1016/j.ijadhadh.2025.104032","DOIUrl":"10.1016/j.ijadhadh.2025.104032","url":null,"abstract":"<div><div>Adhesives play an important role in multiple industries, offering versatile bonding solutions for diverse applications. However, their incorporation in structures where safety is critical has been met with hesitation due to potential degradation risks. Addressing this concern, this study introduces the preliminary assessment of a pattern recognition method aimed at automatically identifying damage in adhesive joints through acoustic signal analysis. This method was tested on experimental samples consisting of aluminum substrates bonded with an acrylic adhesive. Artificially generated defects on the samples was related to the percentage of bonded surface. Damaged samples contained either 25 %, 50 %, or 75 % of bonded surface, whereas healthy samples contained 100 % of bonded surface. Experiments involved applying an impulsive load at one end of the sample and recording the acoustic signal emitted in response to the load using a microphone located at the opposite end. Two classification algorithms were evaluated for discriminating the amount of damage of the samples. First, a multivariate statistical analysis extracted the fundamental frequencies from the acoustic signals to create a model that achieved 95 % of classification accuracy. Second, an Artificial Neural Network (ANN) model was trained and validated with features extracted from the sound pressure level (SPL) signal obtaining an average accuracy of 97.1 % for a 9-fold cross-validation. The results indicate that there is potential for further exploration of the proposed approach, leading to the development of a robust system capable of automatically detecting damage in bonded joints. Future work will explore the performance of the classification techniques for detecting other types of defects related to the lack of adhesion and inadequate curing times.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"140 ","pages":"Article 104032"},"PeriodicalIF":3.2,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}