International Journal of Adhesion and Adhesives最新文献_第7页

Modified glutine adhesives for structural bonding of glued-in rods in timber engineering 木材工程中粘接杆结构粘接用改性胶粘剂

IF 3.5 3区材料科学 Q2 ENGINEERING, CHEMICAL

International Journal of Adhesion and Adhesives

Pub Date : 2025-10-29 DOI: 10.1016/j.ijadhadh.2025.104164

Jana Kolbe, Stephanie Koesling, Thorben Steinberg, Jona Haupt, Lewin Schröder, Till Vallée, Cordula Grunwald

The development of sustainable adhesives is becoming an increasingly important topic in timber engineering, as the industry seeks to replace petroleum-based products with bio-based alternatives. Among the natural candidates, glutine adhesives are attractive due to their renewable origin and long history of use, but their application in structural contexts remains limited by poor resistance to moisture and elevated temperatures. This study addresses these weaknesses by investigating straightforward modifications to raw glutine aimed at enhancing its hygrothermal stability. Several strategies were tested, including reducing water content, incorporating fillers such as chalk or sawdust, and adding phenolic cross-linkers (tannic acid, gallic acid, or combinations). Mechanical performance was evaluated at three scales: lap-shear specimens, small-scale glued-in rods, and large-scale glued-in rods. At room temperature, shear strengths of modified glutine adhesives reached values comparable to epoxy references. Under moderate hygrothermal conditions (45 °C/50%–65% RH), formulations such as M31 (chalk + gallic acid) and M35 (chalk + tannic acid) achieved average shear strengths above 6 MPa, showing substantial improvements over the raw reference adhesive. Severe exposure (60 °C/85% RH), however, led to marked reductions in strength, with failure modes shifting from wood tear-out to adhesive failure. The results show that relatively simple modifications can significantly enhance the hygrothermal stability of glutine adhesives and suggest a promising pathway towards sustainable structural bonding. While further studies are required to clarify degradation mechanisms, assess long-term durability, and evaluate scalability, this work demonstrates the potential of modified glutine adhesives as bio-based alternatives in structural timber applications.

随着行业寻求用生物基替代品取代石油基产品，可持续胶粘剂的开发正成为木材工程中越来越重要的话题。在天然候选材料中，胶粘剂因其可再生来源和悠久的使用历史而具有吸引力，但其在结构环境中的应用仍然受到耐湿气和高温性能差的限制。本研究通过研究旨在提高其湿热稳定性的原料胶的直接改性来解决这些弱点。测试了几种策略，包括降低含水量，加入白垩或木屑等填料，以及添加酚类交联剂（单宁酸，没食子酸或组合）。力学性能在三个尺度上进行了评估：拉剪试件、小规模粘接杆和大规模粘接杆。在室温下，改性胶粘剂的剪切强度达到与环氧树脂参考值相当的值。在中等湿热条件下（45°C/ 50%-65% RH）， M31（白垩+没食子酸）和M35（白垩+单宁酸）等配方的平均剪切强度超过6 MPa，比原始参考粘合剂有了实质性的提高。然而，严重暴露（60°C/85% RH）会导致强度显著降低，破坏模式从木材撕裂转变为粘合剂破坏。结果表明，相对简单的改性可以显著提高胶粘剂的湿热稳定性，为实现可持续结构键合提供了一条有希望的途径。虽然需要进一步的研究来阐明降解机制，评估长期耐久性和评估可扩展性，但这项工作证明了改性胶粘剂作为结构木材中生物基替代品的潜力。

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引用次数: 0

Multifunctional strontium-MOFs-based dental adhesive: Innovation for enhanced bonding performance and bioactivity 多功能锶- mofs牙科胶粘剂：创新增强粘接性能和生物活性

IF 3.5 3区材料科学 Q2 ENGINEERING, CHEMICAL

International Journal of Adhesion and Adhesives

Pub Date : 2025-10-28 DOI: 10.1016/j.ijadhadh.2025.104189

Suphannikar Matphang , Natapat Aueboonprasert , Ramida Rattanakam , Chayada Teanchai , Chomdao Sinthuvanich , Jakrada Attarataya , Matthuros Sonthisathaporn , Khrongkhwan Akkarachaneeyakorn

Dental adhesives are primarily designed for durable adhesion between restorative materials and tooth structures. In addition to their bonding function, formulations increasingly incorporate bioactive fillers that promote remineralization, prevent secondary caries, and prolong the longevity of restorations. In this in vitro study, a novel bioactive dental adhesive was developed using strontium-based metal-organic frameworks (Sr-MOFs) with fumarate ligands as functional nanofillers. The incorporation of 0.5 wt% Sr-MOFs significantly improved the micro-tensile bond strength to 27.04 ± 6.53 MPa (p < 0.05) compared to the control, while maintaining its performance after 6 months of aging. Nanoleakage assessments confirmed superior sealing and reduced silver nitrate penetration, attributed to the nano-sized Sr-MOFs and chemical interaction between the fumarate's carboxylate groups and calcium in dentin. The adhesive also demonstrated remineralization capabilities through the deposition of apatite-like minerals when immersed in SBF. Additionally, non-cytotoxic behavior was observed, with cell viability exceeding 70 % under ISO 10993 guidelines. These findings highlight Sr-MOFs with fumarate as a promising filler for dental adhesives, supporting durable bonding and mineral regeneration for long-term restoration success. Further in vivo validation is required to demonstrate the clinical significance and practical application of these findings.

牙科黏合剂主要用于修复材料和牙齿结构之间的持久黏附。除了它们的粘合功能，配方中越来越多地加入生物活性填料，以促进再矿化，防止继发性龋齿，并延长修复体的寿命。在这项体外研究中，利用富马酸配体作为功能纳米填料的锶基金属有机框架（Sr-MOFs）开发了一种新型生物活性牙胶粘剂。与对照组相比，掺入0.5 wt% sr - mof显著提高了微拉伸结合强度，达到27.04±6.53 MPa (p < 0.05)，并在6个月后保持其性能。纳米泄漏评估证实了优越的密封性和降低硝酸银的渗透性，这归因于纳米尺寸的sr - mof和富马酸羧酸基团与牙本质中钙之间的化学相互作用。该胶粘剂还通过在SBF中沉积磷灰石样矿物表现出再矿化能力。此外，观察到无细胞毒性行为，根据ISO 10993指南，细胞存活率超过70%。这些发现突出了富马酸盐sr - mof作为一种有前途的牙胶粘剂填充剂，支持持久的粘接和矿物再生，长期修复成功。需要进一步的体内验证来证明这些发现的临床意义和实际应用。

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引用次数: 0

Durability of adhesively bonded steel-concrete composite structures under sulfate and chloride exposure: An experimental assessment 钢-混凝土组合结构在硫酸盐和氯化物作用下耐久性的实验评估

IF 3.5 3区材料科学 Q2 ENGINEERING, CHEMICAL

International Journal of Adhesion and Adhesives

Pub Date : 2025-10-27 DOI: 10.1016/j.ijadhadh.2025.104187

Alexandre Rocha , Isabel B. Valente , José B. Aguiar

The long-term performance of adhesively bonded steel–concrete composite structures remains a key concern for their widespread use in civil infrastructure, especially under chemically aggressive environmental conditions. This study conducts a comprehensive experimental program to assess the durability and mechanical performance of galvanised cold-formed steel profiles adhesively bonded to concrete slabs. It addresses uncertainties about the adhesive connections’ behaviour under these conditions. The research involved exposing specimens to sulfate and chloride solutions for 180 and 360 days through cyclic immersion, followed by subsequent drying conditions. To better understand all the variables of the composite specimen, all the materials were individually tested as well.

Results show that sulfate exposure leads to the most severe deterioration, with a tensile strength reduction of over 50 % in the epoxy adhesive and shear strength losses of up to 60 % in composite specimens. Chloride exposure resulted in comparatively lower degradation, although it remained significant. Despite minor strength losses in steel and moderate reductions in concrete bond strength, the adhesive layer was identified as the most vulnerable component. Failures consistently occurred at the epoxy–steel interface, indicating insufficient bonding to galvanised surfaces. The findings highlight the critical influence of environmental conditions on the performance of bonded composites, underscoring the need for improved surface treatment strategies or alternative adhesive formulations for applications in aggressive environments. This research contributes with valuable insights toward the reliable implementation of adhesive bonding in structural engineering. These findings support the revision of design and maintenance strategies for adhesively bonded systems in aggressive environments.

粘接钢-混凝土组合结构的长期性能仍然是其在民用基础设施中广泛应用的一个关键问题，特别是在化学腐蚀性环境条件下。本研究进行了一项全面的实验计划，以评估粘接在混凝土板上的镀锌冷弯型钢型材的耐久性和机械性能。它解决了在这些条件下粘合连接行为的不确定性。该研究包括通过循环浸泡将标本暴露于硫酸盐和氯化物溶液中180天和360天，然后进行干燥条件。为了更好地了解复合试样的所有变量，对所有材料进行了单独测试。结果表明，硫酸盐暴露导致最严重的劣化，环氧胶粘剂的抗拉强度降低超过50%，复合试件的抗剪强度损失高达60%。氯化物暴露导致相对较低的降解，尽管它仍然显著。尽管钢材的强度损失较小，混凝土的粘结强度也有一定程度的降低，但粘结层被认为是最脆弱的成分。失效始终发生在环氧树脂-钢界面，表明与镀锌表面的结合不足。研究结果强调了环境条件对粘合复合材料性能的关键影响，强调了改进表面处理策略或替代粘合剂配方以用于恶劣环境的应用的必要性。本研究为胶粘接在结构工程中的可靠应用提供了有价值的见解。这些发现支持了在恶劣环境中粘合系统的设计和维护策略的修订。

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引用次数: 0

Formulation and solution of functionally graded adhesive joints 功能级配胶接头的配方及解决方案

IF 3.5 3区材料科学 Q2 ENGINEERING, CHEMICAL

International Journal of Adhesion and Adhesives

Pub Date : 2025-10-24 DOI: 10.1016/j.ijadhadh.2025.104194

Yesim Kokner, Feridun Delale

In this paper, the formulation of functionally graded adhesively bonded joints under various loading conditions is considered. The adherends are modeled as composite plates, and the adhesive is modeled as a coupled tension-shear spring with the elastic modulus varying exponentially along the bond line. First, the formulation of the joint under axial, shearing, and bending loads is given in terms of coupled differential equations with variable coefficients for the shear and normal stresses. Next, the solution for the shear and normal stresses is expressed in terms of infinite power series with constant coefficients. Finally, an example, the problem of a single lap joint with the same adherends and subjected to tensile and bending loads, is solved, and the shear and normal stresses are calculated. A finite element (FE) model for functionally graded joints is also developed, and the results are compared with those obtained analytically. There is good agreement between the stresses obtained analytically and using the FE model. It is concluded that the numerical solution based on the formulation presented in this paper gives reasonably accurate results and can be used with confidence to determine both the shear and normal stresses in functionally graded adhesively bonded joints.

本文考虑了不同载荷条件下功能梯度粘接接头的配方。黏合剂模型为复合材料，黏合剂模型为弹性模量沿黏结线呈指数变化的拉剪耦合弹簧。首先，给出了轴向、剪切和弯曲荷载作用下节理的变系数耦合微分方程。其次，将剪应力和正应力的解以常系数无穷幂级数的形式表示。最后，以具有相同附着物的单搭接为例，对其在拉、弯荷载作用下的剪应力和正应力进行了计算。建立了功能梯度节理的有限元模型，并与解析计算结果进行了比较。分析得到的应力值与有限元模型计算的应力值吻合较好。结果表明，基于本文公式的数值解给出了较为准确的结果，可以可靠地用于确定功能梯度粘结接头的剪应力和法向应力。

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引用次数: 0

Castor oil-based polyurethane sealant for road crack repair: An experimental study of durability 道路裂缝修补用蓖麻油基聚氨酯密封胶耐久性试验研究

IF 3.5 3区材料科学 Q2 ENGINEERING, CHEMICAL

International Journal of Adhesion and Adhesives

Pub Date : 2025-10-24 DOI: 10.1016/j.ijadhadh.2025.104193

Zhongbao Shi , Jiajun Ji , Xiaosong Liu , Jia Sun , Zengping Zhang

With the increase of service life, cracks have become a typical disease of pavement structure. Embedding sealants into cracks is one of the most widely used and cost-effective treatment methods. In recent years, polyurethane (PU) sealant has been gradually used to repair pavement cracks due to its excellent high and low temperature performance, strong adhesion properties and room temperature construction. However, the durability of PU sealant has not been systematically verified compared with that of traditional pavement sealant, which limits its popularization. Therefore, in this study, a castor oil-based PU sealant was prepared by a two-step method, and its durability was comprehensively analyzed in combination with self-designed mechanical property tests considering age (7d, 14d, 21d, 28 d, 60d, and 90d), storage stability tests and weatherability tests. The results showed that the mechanical properties of the sealant were always maintained at a high level with the increase of age. In three months, the tensile strength, elongation at break, bond strength, and hardness of the PU sealant increased from 1.19 MPa, 102.19 %, 1.08 MPa, and 49 HA to 2.33 MPa, 165.33 %, 1.33 MPa, and 55 HA, respectively. In addition, when the storage time reached 21-28d, the construction performance and mechanical properties of the sealant reached the best. Finally, the PU sealant showed excellent low temperature resistance, water resistance and UV aging resistance, but the high temperature resistance is slightly insufficient. Overall, the PU sealant has excellent durability and can meet the current demand for long-life road construction.

随着使用寿命的增加，裂缝已成为路面结构的一种典型病害。在裂缝中嵌入密封剂是最广泛使用和最经济有效的处理方法之一。近年来，聚氨酯（PU）密封胶因其优异的高低温性能、强附着力、常温施工等优点，逐渐被用于修补路面裂缝。然而，聚氨酯密封胶的耐久性与传统路面密封胶的耐久性相比，尚未得到系统的验证，限制了其推广。因此，本研究采用两步法制备蓖麻油基PU密封胶，并结合自行设计的力学性能试验，综合考虑龄期（7d、14d、21d、28d、60d、90d）、贮存稳定性试验和耐候性试验，对其耐久性进行综合分析。结果表明，随着龄期的增加，密封胶的力学性能始终保持在较高的水平。在3个月内，PU密封胶的抗拉强度、断裂伸长率、粘结强度和硬度分别从1.19 MPa、102.19%、1.08 MPa和49ha提高到2.33 MPa、165.33%、1.33 MPa和55ha。另外，当贮存时间达到21-28d时，密封胶的施工性能和力学性能达到最佳。最后，PU密封胶表现出优异的耐低温性、耐水性和耐紫外线老化性，但耐高温性略显不足。总体而言，PU密封胶具有优异的耐久性，可以满足当前对长寿命道路建设的需求。

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引用次数: 0

Bending strength of adhesively-bonded 3D-printed polymer structures 粘接3d打印聚合物结构的抗弯强度

IF 3.5 3区材料科学 Q2 ENGINEERING, CHEMICAL

International Journal of Adhesion and Adhesives

Pub Date : 2025-10-23 DOI: 10.1016/j.ijadhadh.2025.104188

T.F.R. Ribeiro , F.A.F.S. Magalhães , R.D.S.G. Campilho , R.F.R. Pinto , R.J.B. Rocha , K. Madani

Often referred to as three-dimensional (3D) printing or 3DP, additive manufacturing (AM) is a growing alternative to conventional fabrication methods such as injection moulding and machining. Rapid prototyping, improved material efficiency, and the ability to create extremely complex geometries are some of its key advantages. Size constraints in AM components, however, continue to be a significant drawback, requiring the joining of smaller printed components to produce complex structures. This study uses additively manufactured polymeric adherends, namely Acrylonitrile Butadiene Styrene (ABS), Polyethylene Terephthalate Glycol-modified (PETG), and Polylactic Acid (PLA), to investigate the structural behaviour of single-lap joints (SLJ) under four-point bending (4 PB). Araldite® 2015 and Sikaforce® 7752 adhesives were used to obtain the bonded joints. Experimental testing was used to determine the adherends’ mechanical characteristics, such as their elastic modulus, plastic deformation characteristics, and fracture behaviour. Failure modes, maximum load (P_m), joint stiffness (k_max), and energy absorption (E_max) were assessed by means of an experimental campaign. The results were compared to predictions made by a Cohesive Zone Model (CZM). The findings highlight how adherend material, adhesive type, and overlap length (L_O) all significantly affect joint performance. The Sikaforce® 7752/PLA combination exhibited the highest P_m and E_max (161 N and 1.58 J, respectively), while PLA bonded with the Araldite® 2015 showed the highest k_max (10.29 N/mm), in all cases with the highest L_O studied of 20 mm.

通常被称为三维（3D）打印或3DP，增材制造（AM）是传统制造方法（如注塑和机械加工）的一种日益增长的替代方法。快速成型，提高材料效率，以及创建极其复杂的几何形状的能力是它的一些关键优势。然而，增材制造组件的尺寸限制仍然是一个重大缺点，需要连接较小的印刷组件来生产复杂的结构。本研究使用增材制造的聚合物粘合剂，即丙烯腈-丁二烯-苯乙烯（ABS），聚对苯二甲酸乙二醇改性（PETG）和聚乳酸（PLA），研究了单搭接接头（SLJ）在四点弯曲（4pb）下的结构行为。使用Araldite®2015和Sikaforce®7752胶粘剂获得粘合接头。通过实验测试确定附着体的力学特性，如弹性模量、塑性变形特性和断裂行为。失效模式、最大载荷（Pm）、关节刚度（kmax）和能量吸收（Emax）通过实验活动进行评估。结果与内聚带模型（CZM）的预测结果进行了比较。研究结果强调了粘合材料、粘合类型和重叠长度（LO）对接头性能的显著影响。Sikaforce®7752/PLA组合具有最高的Pm和Emax（分别为161 N和1.58 J），而PLA与Araldite®2015结合具有最高的kmax (10.29 N/mm)，在所有研究的最高LO为20 mm的情况下。

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引用次数: 0

Guayule resin as a bio-based modifier for soy protein adhesive systems 胶胶菊树脂作为生物基改性剂用于大豆蛋白胶粘剂体系

IF 3.5 3区材料科学 Q2 ENGINEERING, CHEMICAL

International Journal of Adhesion and Adhesives

Pub Date : 2025-10-23 DOI: 10.1016/j.ijadhadh.2025.104195

Sarocha Pradyawong, Kimberly Ogden

Guayule (Parthenium argentatum) is a promising source of natural rubber. It is a semi-arid perennial shrub native to the Southwest part of the United States and Mexico. Unfortunately, one of the reasons guayule rubber has not been commercialized is because there currently are no markets for the potential coproducts. Finding markets for the guayule resin and bagasse would greatly strengthen the economics of guayule rubber production. Hence, the aim of this preliminary study was to develop a new application for guayule resin as an additive for soy protein (SP) adhesives to increase the wet tensile strength. The resin was modified with NaOH in hexane, acetone, and water solutions, and subsequently mixed with soy protein adhesive at different concentrations. An addition of 7.5 % resin to soy protein adhesive showed the highest elastic modulus representing the highest intermolecular interactions. The highest water resistance was also observed for soy protein blended with 7.5 % resin. The wet adhesion strength significantly increased by 70 % compared to pure soy protein adhesive. Differential scanning calorimetry suggested that guayule resin strengthened soy protein network by interacting with 7S and 11S subunits of SP. The changes in soy protein properties were due to the interactions between guayule resin and protein's backbone and side chains. This study demonstrates the potential to utilize guayule resin as a bio-adhesive for wood industries.

银胶菊（Parthenium argentatum）是一种很有前途的天然橡胶来源。它是一种半干旱的多年生灌木，原产于美国西南部和墨西哥。不幸的是，银胶菊橡胶尚未商业化的原因之一是目前潜在的副产品没有市场。为银胶菊树脂和甘蔗渣寻找市场将大大加强银胶菊橡胶生产的经济效益。因此，本初步研究的目的是开发胶胶菊树脂作为大豆蛋白（SP）胶粘剂添加剂的新应用，以提高其湿拉伸强度。用氢氧化钠在己烷、丙酮和水溶液中对树脂进行改性，然后与不同浓度的大豆蛋白粘合剂混合。在大豆蛋白胶中添加7.5%的树脂，其弹性模量最高，分子间相互作用最高。与7.5%树脂混合的大豆蛋白的耐水性也最高。与纯大豆蛋白胶粘剂相比，湿粘强度显著提高70%。差示扫描量热法表明，胶胶菊树脂通过与SP的7S和11S亚基相互作用增强了大豆蛋白网络，大豆蛋白性质的变化是由于胶胶菊树脂与蛋白质的主链和侧链相互作用所致。本研究证明了胶胶菊树脂作为木材工业生物粘合剂的潜力。

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引用次数: 0

Breaking the trade-off in flame-retardant epoxy resins: A high-crosslinking DOPO additive for simultaneous fire safety and mechanical reinforcement 打破阻燃环氧树脂的权衡：一种同时防火安全和机械增强的高交联DOPO添加剂

IF 3.5 3区材料科学 Q2 ENGINEERING, CHEMICAL

International Journal of Adhesion and Adhesives

Pub Date : 2025-10-19 DOI: 10.1016/j.ijadhadh.2025.104186

Yu Long , Cui Li , Xiaohang Yu , Tao Zhang , Meng Xin , Guohua Fan , Chuncheng Hao

This study addresses the reduced crosslinking density and diminished thermomechanical properties in traditional DOPO-based flame retardants for epoxy resins due to flexible segments and steric hindrance. A molecular design strategy incorporates the DOPO flame-retardant group into the A1E2PG molecule, which has high epoxy density and a rigid structure, via an addition reaction. This produces a novel flame retardant, D-E2PG, combining dual epoxy active sites with phosphorus-based flame-retardant functionality. The effects of D-E2PG on thermomechanical, dielectric, and flame-retardant properties are investigated using curing kinetics, DMA, tensile testing, and CCT. Results show that at 15 phr D-E2PG, the cured resin's Tg increases from 149.8 °C to 164.8 °C, tensile strength rises by 21 %, and crosslinking density improves by 50 %. The dielectric constant (at 1 MHz) decreases to 3.3, and dielectric loss reduces by 48.4 %. Flame-retardant performance significantly improves, with LOI reaching 32.4 %, UL-94 achieving V-0 grade, PHRR decreasing by 54.4 %, and THR reducing by 37.4 %. This system resolves performance degradation issues through synergy between high crosslinking density, a rigid aromatic ring, and phosphorus-based flame-retardant groups, offering a new approach for designing high-performance flame-retardant epoxy resins.

本研究解决了传统的环氧树脂用dopo基阻燃剂由于柔性段和位阻导致交联密度降低和热机械性能下降的问题。一种分子设计策略是通过加成反应将DOPO阻燃基团加入到具有高环氧密度和刚性结构的A1E2PG分子中。这产生了一种新型阻燃剂D-E2PG，结合了双环氧活性位点和磷基阻燃功能。通过固化动力学、DMA、拉伸测试和CCT研究了D-E2PG对热力学、介电和阻燃性能的影响。结果表明，在15 phr D-E2PG下，固化树脂的Tg从149.8℃提高到164.8℃，抗拉强度提高21%，交联密度提高50%。在1 MHz时介电常数降低到3.3，介电损耗降低48.4%。阻燃性能显著提高，LOI达到32.4%，UL-94达到V-0级，PHRR降低54.4%，THR降低37.4%。该体系通过高交联密度、刚性芳环和磷基阻燃基团之间的协同作用解决了性能退化问题，为设计高性能阻燃环氧树脂提供了新途径。

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引用次数: 0

Application of the Cohesive Sequential Static Fatigue algorithm to bonded joints considering the load-ratio effect 考虑载荷比效应的粘结接头内聚序贯静态疲劳算法的应用

IF 3.5 3区材料科学 Q2 ENGINEERING, CHEMICAL

International Journal of Adhesion and Adhesives

Pub Date : 2025-10-17 DOI: 10.1016/j.ijadhadh.2025.104178

S. Safaei, M. Carboni, L.M. Martulli, A. Bernasconi

Debonding under fatigue loading is a common failure mode in adhesively bonded joints, where the load ratio (R-ratio) can significantly affect crack propagation behaviour. Accurately predicting fatigue crack growth, including the influence of the R-ratio, is crucial to ensure the safety and long-term reliability of these joints in structural applications. The objective of this study is to adapt the Cohesive–Sequential Static Fatigue (C-SSF) method, originally developed for delamination, to adhesively bonded joints under fatigue loading, with a particular focus on assessing its ability to capture the influence of the R-ratio. Published experimental results for Mode I and Mode II loading conditions are used to validate the accuracy of the C-SSF method in modelling fatigue-induced debonding across different R-ratios. The results demonstrate that the C-SSF method consistently captures the influence of the R-ratio on fatigue crack growth in adhesively bonded joints under both Mode I and Mode II loading conditions. Additionally, a numerical exercise is conducted on a non-standard specimen, revealing that when the maximum load is held constant, the crack growth rate decreases with increasing R-ratio. Overall, the C-SSF method exhibits significant potential as a numerical tool for simulating fatigue crack propagation in adhesively bonded joints under various loading conditions, including different R-ratios.

疲劳载荷下的脱粘是粘接接头常见的破坏模式，其中载荷比（R-ratio）对裂纹扩展行为有显著影响。准确预测疲劳裂纹扩展，包括r比的影响，对于保证这些接头在结构应用中的安全性和长期可靠性至关重要。本研究的目的是将最初为分层而开发的内聚-顺序静态疲劳（C-SSF）方法应用于疲劳载荷下的粘接接头，并特别侧重于评估其捕捉r比影响的能力。利用已发表的I型和II型加载条件的实验结果，验证了C-SSF方法在不同r比下模拟疲劳诱导脱粘的准确性。结果表明，C-SSF方法在ⅰ型和ⅱ型加载条件下均能较好地反映r比对粘接接头疲劳裂纹扩展的影响。另外，对非标准试样进行了数值计算，结果表明，当最大载荷一定时，裂纹扩展速率随r比的增大而减小。总的来说，C-SSF方法作为一种数值工具，在各种加载条件下（包括不同的r比），显示出巨大的潜力来模拟粘接接头的疲劳裂纹扩展。

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引用次数: 0

T-peeling behavior of LiFePO4 electrode interfaces in lithium-ion batteries 锂离子电池中LiFePO4电极界面的t剥离行为

IF 3.5 3区材料科学 Q2 ENGINEERING, CHEMICAL

International Journal of Adhesion and Adhesives

Pub Date : 2025-10-17 DOI: 10.1016/j.ijadhadh.2025.104179

Shaohai Dong , Siyu Gu , Bin Jiang , Zhan-Sheng Guo

Cycling-induced interfacial delamination severely compromises the durability of lithium-ion batteries, highlighting the critical need for accurate assessment of electrode adhesion. To address this, an optimized T-peeling test method was introduced in which symmetric clamping of the free ends and a downward constraint orientation reduce data variability. The optimized method was employed on LiFePO₄ electrodes across a peeling rate range of 5–100 mm/min. Macro-imaging, scanning electron microscopy analysis, and energy-dispersive X-ray spectroscopy elemental mapping confirm interfacial fracture at the active layer/current collector interface as the exclusive failure mechanism during steady-state peeling. By integrating peeling theory with T-peeling load-displacement curve analysis, the steady-state peeling load (with a mean value of 0.18 N) is insensitive to peeling rates within the tested range, with a fracture energy of 24.1 N/m consistent with literature values. Finite element simulations corroborate the experimental peeling behavior. These findings establish T-peeling as a reliable method for interfacial adhesion characterization in battery research and provide electrode design guidelines.

循环引起的界面分层严重损害了锂离子电池的耐用性，强调了准确评估电极粘附性的迫切需要。为了解决这一问题，引入了一种优化的t剥离测试方法，其中自由端对称夹紧和向下约束方向减少了数据的可变性。将优化后的方法应用于LiFePO4电极上，剥离速率范围为5 ~ 100 mm/min。宏观成像、扫描电镜分析和能量色散x射线能谱元素图证实，在稳态剥离过程中，有源层/集流器界面的界面破裂是唯一的失效机制。将剥离理论与t -剥离载荷-位移曲线分析相结合，得到稳态剥离载荷（均值0.18 N）对试验范围内剥离速率不敏感，断裂能为24.1 N/m，与文献值一致。有限元模拟证实了实验剥离行为。这些发现确立了t剥离作为电池研究中界面粘附特性的可靠方法，并提供了电极设计指南。

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引用次数: 0