International Journal of Fatigue最新文献_第6页

Data-driven fatigue life prediction of corroded steel wires: A transfer learning on stacking interpretable model and feature sensitivity analysis 数据驱动的锈蚀钢丝疲劳寿命预测：基于叠加可解释模型和特征敏感性分析的迁移学习

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2026-06-01 Epub Date: 2026-01-12 DOI: 10.1016/j.ijfatigue.2026.109498

Tao Huang , Chunfeng Wan , Tingbin Liu , Yucheng Zhang , Xiangtao Lu , Youliang Ding , Hanwei Zhao , Changqing Miao , Songtao Xue

The study of the fatigue performance of corroded steel wires in bridge cables holds significant scientific value for advancing structural theory and informing engineering practice. To address key challenges in fatigue life prediction such as the scarcity of the complexity of nonlinear relationships and the lack of model interpretability, this study proposes a progressive solution framework consisting of integrated optimization, transfer validation, model interpretation, platform development. A dual-source heterogeneous database (A/B) was first constructed by integrating 422 sets of specimens data from the literature with 30 sets of experimental data obtained through independently conducted corrosion tests. An integration strategy based on stacked-transfer models is used to couple the strengths of six different machine learning (ML) models. The improved sparrow optimisation (ISSA) algorithm was employed for hyperparameter optimization. The results demonstrate that the proposed Stacking model surpasses both individual base learners and existing mathematical models from literature and specifications in prediction accuracy. When transferred to new independent datasets, the model maintains excellent predictive performance, validating its strong generalization capability. Furthermore, by incorporating the SHAP framework, the study systematically deciphers the model’s decision-making mechanism and quantifies the contribution distribution of individual parameters to fatigue life. Finally, to enhance model applicability, a web-based human–computer interaction platform for intelligent fatigue life prediction was developed based on the stacking-SHAP model. This study provides a data-algorithm-platform trinity solution for the whole life cycle management of bridge cables.

研究桥梁缆索腐蚀钢丝的疲劳性能，对于推进结构理论和指导工程实践具有重要的科学价值。针对疲劳寿命预测中非线性关系复杂性不足和模型可解释性不足等关键问题，本文提出了一个由集成优化、传递验证、模型解释和平台开发组成的渐进式解决方案框架。首先将文献中422组试样数据与独立进行腐蚀试验获得的30组实验数据进行整合，构建双源异构数据库（A/B）。采用基于堆叠迁移模型的集成策略，对六种不同机器学习模型的优势进行了耦合。采用改进的麻雀优化算法（ISSA）进行超参数优化。结果表明，本文提出的叠加模型在预测精度上优于单个基础学习器和现有文献和规范的数学模型。当转移到新的独立数据集时，该模型保持了良好的预测性能，验证了其强大的泛化能力。结合SHAP框架，系统解读了模型的决策机制，量化了各参数对疲劳寿命的贡献分布。最后，为了提高模型的适用性，开发了基于web的基于堆叠- shap模型的智能疲劳寿命预测人机交互平台。本研究为桥梁电缆全生命周期管理提供了数据-算法-平台三位一体的解决方案。

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引用次数: 0

Microstructural evolution for enhanced high temperature fretting fatigue resistance in GH4169 via laser assisted ultrasonic surface rolling process 激光辅助超声表面轧制增强GH4169耐高温微动疲劳性能的组织演变

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2026-06-01 Epub Date: 2026-01-12 DOI: 10.1016/j.ijfatigue.2026.109487

Hao Zhang , Daoxin Liu , Jing Yang , Mengyao Li , Junnan Wu , Yueyang Li , Yanjie Liu , Yu Zhang , Xiaohua Zhang , Chang Ye

Laser assisted ultrasonic surface rolling process (LA-USRP) was applied to GH4169 superalloy to improve its high temperature fretting fatigue resistance. Conventional USRP increased the fretting fatigue life under axial tension–tension cyclic loading (stress ratio R = 0.1, frequency of 131 ± 2 Hz, maximum stress of 800 MPa, and contact pressure of 85 MPa) at 600 °C by a factor of 3.3, whereas LA-USRP achieved a 14.7-fold enhancement compared to the base material. This superior performance is primarily attributed to advantageous microstructural evolution, including a thicker gradient nanostructured surface layer (average surface grain size around 25 nm), higher compressive residual stresses (surface −2079 MPa, maximum −2443 MPa at around 35 μm depth), and the formation of refined nanotwins and stabilized 9R phase. These features significantly improve cyclic stability of compressive residual stresses (relaxation reduced from 89.6 % in USRP to 35.9 % in LA-USRP after fatigue) and impede dislocation motion at elevated temperatures. These findings offer a promising approach for enhancing the high temperature fretting fatigue performance of critical aero-engine components.

为提高GH4169高温合金的耐高温微动疲劳性能，采用激光辅助超声表面轧制工艺（LA-USRP）对其进行了加工。传统USRP在600 °C时，将轴向拉伸-拉伸循环加载（应力比R = 0.1，频率为131 ± 2 Hz，最大应力为800 MPa，接触压力为85 MPa）下的微动疲劳寿命提高了3.3倍，而LA-USRP则比基材提高了14.7倍。这种优异的性能主要归功于有利的微观结构演变，包括更厚的梯度纳米结构表面层（平均表面晶粒尺寸约为25 nm），更高的压缩残余应力（表面- 2079 MPa，深度约为35 μm时最大- 2443 MPa），以及精炼纳米孪晶和稳定9R相的形成。这些特征显著提高了压缩残余应力的循环稳定性（疲劳后松弛从USRP的89.6% %降低到LA-USRP的35.9% %），并阻碍了位错在高温下的运动。这些发现为提高航空发动机关键部件的高温微动疲劳性能提供了一条有希望的途径。

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引用次数: 0

Redefining stress triaxiality for ultra-low cycle fatigue of structural steels 结构钢超低周疲劳应力三轴性的重新定义

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2026-06-01 Epub Date: 2026-01-25 DOI: 10.1016/j.ijfatigue.2026.109520

Qun He , Michael C.H. Yam , Xue-Mei Lin , H.C. Ho , Kwok-Fai Chung

Stress triaxiality has been a cornerstone parameter for describing void growth and ductile fracture in metals for more than 60 years. Its classical definition, derived from

J_{2}

plasticity without accounting for backstress, becomes inadequate in ultra-low cycle fatigue conditions, where backstress evolution and load reversals significantly alter the stress state. In such cases, the conventional definition of stress triaxiality may even lead to singularities when the second invariant of deviatoric stress, i.e.,

J_{2}

, approaches zero. This study revisits the classical void growth problem and demonstrates that the definition of stress triaxiality is inherently dependent on the adopted plasticity model. Specifically, once backstress is included in cyclic plasticity, it must also be accounted for in the definition of stress triaxiality to maintain consistency. In this way, a new definition of stress triaxiality incorporating the effect of backstress is proposed, providing a physically meaningful measure of stress triaxiality under cyclic loading. The new definition is analytically derived and validated through ultra-low cycle fatigue (ULCF) experiments of high-strength steel Q690, supported by finite element simulations. Results show that the proposed definition reliably captures the stress state associated with void growth and accurately predicts ULCF crack initiation life, overcoming the limitations of the classical definition. These findings establish, for the first time, a consistent theoretical and experimental basis for extending void-based fracture models to cyclic loading, with direct implications for assessing the seismic safety of steel structures.

60多年来，应力三轴性一直是描述金属中空洞生长和韧性断裂的基础参数。它的经典定义是从J2塑性推导而来，没有考虑回应力，在超低周疲劳条件下变得不充分，在超低周疲劳条件下，回应力演化和载荷反转会显著改变应力状态。在这种情况下，当偏应力的第二个不变量J2趋近于零时，应力三轴性的传统定义甚至可能导致奇点。该研究回顾了经典的空洞生长问题，并证明应力三轴性的定义本质上依赖于所采用的塑性模型。具体来说，一旦回应力被纳入循环塑性，它也必须在应力三轴性的定义中考虑，以保持一致性。通过这种方式，提出了包含背应力影响的应力三轴性的新定义，为循环加载下的应力三轴性提供了一种物理上有意义的测量方法。通过高强度钢Q690的超低周疲劳试验，结合有限元模拟，对新定义进行了解析推导和验证。结果表明，该定义可靠地捕捉了与孔洞扩展相关的应力状态，并准确地预测了ULCF裂纹起裂寿命，克服了经典定义的局限性。这些发现首次为将基于孔洞的断裂模型扩展到循环荷载建立了一致的理论和实验基础，对评估钢结构的抗震安全性具有直接意义。

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引用次数: 0

Fatigue mechanisms and life prediction of cracked steel elements repaired with cold-expanded crack-stop holes 冷扩止裂孔修复裂纹钢构件的疲劳机理及寿命预测

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2026-06-01 Epub Date: 2026-01-10 DOI: 10.1016/j.ijfatigue.2026.109484

Lu Ke , Youlin Li , Chuanxi Li , Xu Jiang , Jun Ye , Ailong Chen , Guojin Li

Fatigue cracks in steel elements repaired with traditional crack-stop holes are susceptible to perforation, enabling propagation and resulting in inadequate fatigue life improvement. The fatigue performance of cracked steel elements repaired by cold-expanded crack-stop holes was experimentally investigated, and the effects of cold expansion ratios and hole-to-crack tip distances on the fatigue life were examined. Finite element (FE) simulation tests were conducted to reveal the residual stress distributions around the crack-stop holes after cold expansion. The results show that higher cold expansion ratios significantly enhance fatigue life under an identical hole-to-crack tip distance. When the hole-to-crack tip distance was 0 mm, a cold expansion ratio of 2% yielded the greatest fatigue life improvement, with a 50.82% increase compared to specimens without cold expansion. Moreover, the residual stress was distributed nonlinearly along the thickness direction of the steel elements, with the peak residual stress occurring near the exit side of the cold expansion mandrel. Finally, based on the critical distance theory and residual stress weight allocation coefficient, a fatigue life prediction model for the crack initiation at the hole edges was developed. Simultaneously, based on linear elastic fracture mechanics, a fatigue life prediction model for the crack growth was proposed. The results indicated that the experimental and predicted values of the total fatigue life are in good agreement. This study offers a cold expansion technique for crack-stop holes, providing a novel technique for extending the fatigue life of cracked steel structures.

传统止裂孔修复钢构件疲劳裂纹容易穿孔，容易扩展，导致疲劳寿命提高不足。试验研究了冷扩止裂孔修复裂纹钢构件的疲劳性能，考察了冷扩比和孔-裂纹尖端距离对疲劳寿命的影响。通过有限元模拟试验，揭示了冷胀后止裂孔周围的残余应力分布。结果表明，在相同的孔-裂纹尖端距离下，较高的冷膨胀率显著提高了疲劳寿命。当孔-裂纹尖端距离为0 mm时，冷膨胀率为2%的试样疲劳寿命提高幅度最大，比未冷膨胀的试样疲劳寿命提高50.82% %。残余应力沿钢件厚度方向呈非线性分布，残余应力峰值出现在冷胀芯筒出口侧附近。最后，基于临界距离理论和残余应力权重分配系数，建立了孔边缘裂纹起裂疲劳寿命预测模型。同时，基于线弹性断裂力学，提出了裂纹扩展的疲劳寿命预测模型。结果表明，总疲劳寿命的实验值与预测值吻合较好。本研究提出了一种止裂孔的冷扩技术，为延长裂纹钢结构的疲劳寿命提供了一种新技术。

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引用次数: 0

Investigating the influence of thermal Post-Processing on the Mode I and Mode II fatigue fracture resistance of additively manufactured carbon Fiber composites 研究了热后处理对增材制造碳纤维复合材料I型和II型疲劳断裂抗力的影响

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2026-06-01 Epub Date: 2026-01-08 DOI: 10.1016/j.ijfatigue.2026.109485

Zane Forbes , Xiaobo Yu , Garth Pearce , Mathew W Joosten

Interlaminar defects such as voids and incomplete fibre–matrix consolidation limit the fatigue performance of additively manufactured (AM) continuous-fibre composites. This study examines how thermal post-processing influences Mode I (DCB) and Mode II (ENF) fatigue crack-growth behaviour in 3D-printed CF/PA laminates. Across all load levels, post-processed specimens showed substantially improved fatigue resistance, requiring approximately 40–50% higher energy-release rates to reach the same crack-growth rates as the as-printed material. Crack-length–versus-cycle curves further demonstrated that post-processed specimens endured significantly more cycles to reach equivalent crack lengths. Microscopy revealed distinct mechanisms underlying these improvements: void elimination and smoother crack planes in Mode I, and increased crack-face contact and frictional dissipation along shear-sliding surfaces in Mode II. Finite-element simulations using the CF20 fatigue cohesive model reproduced the experimental trends with minimal calibration. Overall, thermal post-processing provides a simple and effective pathway to enhance the fatigue durability of additively manufactured composite laminates.

层间缺陷如空洞和纤维基体固结不完全等限制了增材制造（AM）连续纤维复合材料的疲劳性能。本研究探讨了热后处理如何影响3d打印CF/PA层压板的I型（DCB）和II型（ENF）疲劳裂纹扩展行为。在所有荷载水平下，后处理的试样显示出显著提高的抗疲劳性，需要大约40-50%的能量释放率才能达到与打印材料相同的裂纹扩展率。裂纹长度与循环曲线进一步表明，经过后处理的试样承受了更多的循环来达到等效的裂纹长度。显微镜显示了这些改进背后的不同机制：在模式I中，空洞消除和更光滑的裂纹面，在模式II中，裂纹面接触和沿剪切滑动表面的摩擦耗散增加。使用CF20疲劳内聚模型的有限元模拟以最小的校准再现了实验趋势。综上所述，热后处理为提高增材复合材料层合板的疲劳耐久性提供了一条简单有效的途径。

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引用次数: 0

Multicondition fatigue behaviors of GH4169 alloy film cooling holes under thermo-mechanical coupling effects 热-力耦合作用下GH4169合金薄膜冷却孔的多工况疲劳行为

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2026-06-01 Epub Date: 2026-01-14 DOI: 10.1016/j.ijfatigue.2026.109492

Longqing Lei , Zhengqiu Zhang , Weibing Liu , Yuefei Luo , Wei Chen , Yangjie Zuo

The fatigue behavior of film cooling hole structures in hot-section components, particularly under thermo-mechanical coupling effects, is crucial for enhancing the durability and performance of gas turbines. This study investigates the fatigue performance of four typical film-cooling hole configurations (30° and 45° cylindrical holes (CH-30° and CH-45°), fan-shaped holes (FSH), and laidback fan-shaped holes (LFSH)) fabricated from the GH4169 alloy. A combined experimental and numerical approach was employed, examining the fatigue life and crack propagation under three temperature conditions: 25 °C, 500 °C, and 500 °C with coolant pass through the hole, which simulated the film cooling. The results demonstrate that fatigue life is significantly influenced by the geometry of the cooling holes and thermal environment. CH-30° consistently exhibited superior fatigue resistance across all temperature conditions. At 500 °C, the introduction of coolant notably improved fatigue life, especially for configurations such as LFSH, which showed an enhanced fatigue life compared to conventional shapes. The study also reveals that crack initiation and propagation predominantly occur at the upstream edge of the film holes, with significant variations in crack evolution mechanisms observed across different hole types and thermal conditions. This research provides a comprehensive understanding of the fatigue behavior of film-cooling hole structures with different thermal conditions and offers valuable insights into the optimization of hole geometries for improved fatigue resistance in high-temperature applications.

热截面部件的气膜冷却孔结构的疲劳性能，特别是在热-力耦合作用下的疲劳性能，对提高燃气轮机的耐久性和性能至关重要。研究了GH4169合金四种典型的气膜冷却孔结构（30°和45°圆柱孔（CH-30°和CH-45°）、扇形孔（FSH）和懒散扇形孔（LFSH））的疲劳性能。采用实验与数值相结合的方法，在25°C、500°C和500°C三种温度条件下，研究了冷却剂通过孔的疲劳寿命和裂纹扩展，模拟了膜状冷却。结果表明，冷却孔的几何形状和热环境对疲劳寿命有显著影响。CH-30°在所有温度条件下均表现出优异的抗疲劳性能。在500°C时，冷却剂的引入显著提高了疲劳寿命，特别是对于LFSH这样的配置，与传统形状相比，它的疲劳寿命得到了提高。研究还表明，裂纹的起裂和扩展主要发生在膜孔的上游边缘，不同孔类型和热条件下裂纹的演化机制存在显著差异。该研究提供了对不同热条件下气膜冷却孔结构疲劳行为的全面理解，并为优化孔几何形状以提高高温应用中的抗疲劳性提供了有价值的见解。

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引用次数: 0

Mechanistic insight and universal life prediction of strain rate-dependent fatigue in nickel-based superalloy at elevated temperature 镍基高温合金高温应变速率相关疲劳的机理及通用寿命预测

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2026-06-01 Epub Date: 2026-01-21 DOI: 10.1016/j.ijfatigue.2026.109512

Hao-Qi Fan , Kai-Shang Li , Ning Yao , Wen-Rui Nie , Run-Zi Wang , Ti-Wen Lu , Lu Cheng , Xiu-Fang Gong , Xian-Cheng Zhang , Shan-Tung Tu

Start-up and shut-down transients in turbomachinery impose varying strain rates that affect the in-service life of high-temperature components. However, the quantitative role of strain rate sensitivity in high-temperature fatigue of nickel-based superalloys remains inadequately reflected in damage mechanism and life prediction. In this study, fully-reversed strain-controlled low cycle fatigue (LCF) tests were performed at 650 ℃ over a wide range of strain rates from 5 × 10⁻⁵ to 1 × 10⁻² s⁻¹. The experimental results reveal the existence of a threshold strain-rate range for nickel-based superalloy IN718. When the strain rate exceeds this threshold, the fatigue life remains nearly constant with increasing strain rate. The cracking behavior is dominated by the transgranular-intergranular mixed mode. In contrast, at strain rates below this threshold, the fatigue life decreases rapidly due to the time available for oxidation- and creep-assisted damage. Based on these observations, a modified energy-based model incorporating the strain rate sensitivity was proposed using tensile-derived plastic strain energy density, achieving a prediction accuracy of 97% within a ±2 error band. These findings provide an effective strategy for enhancing the service reliability of high-temperature rotating components.

涡轮机械的启动和关闭瞬态产生不同的应变速率，从而影响高温部件的使用寿命。然而，应变率敏感性在镍基高温合金高温疲劳中的定量作用在损伤机理和寿命预测中仍未得到充分体现。在这项研究中，在650℃下，在5 × 10−5到1 × 10−2 s−1的应变速率范围内进行了完全反向应变控制低周疲劳（LCF）试验。实验结果表明，镍基高温合金IN718存在一个阈应变速率范围。当应变速率超过该阈值时，随着应变速率的增加，疲劳寿命基本保持不变。裂纹行为以穿晶-晶间混合模式为主。相反，当应变率低于该阈值时，由于氧化和蠕变辅助损伤的可用时间，疲劳寿命迅速下降。基于这些观察结果，提出了一种改进的基于能量的模型，结合应变率敏感性，使用拉伸导出的塑性应变能密度，在±2的误差范围内实现了97%的预测精度。这些研究结果为提高高温旋转部件的使用可靠性提供了有效的策略。

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引用次数: 0

Near-threshold fatigue resistance of micrometer-grained steel welds: mechanisms and modeling 微米晶粒钢焊缝的近阈值抗疲劳：机理与建模

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2026-06-01 Epub Date: 2026-01-16 DOI: 10.1016/j.ijfatigue.2026.109494

Quan-Heng Yao, Rong Chen, Wen-Qing Lu, Xu-Yang Mo, Ming-Liang Zhu, Fu-Zhen Xuan

Materials with coarse grains are believed to have higher fatigue threshold with respect to damage tolerance design, in such a context, the mechanisms for fine grains governing fatigue crack propagation are not clear. In this study, the near-threshold fatigue crack propagation behavior of L907A steel welded joints with micrometer-size grains (∼2.5 μm) was investigated, and the associated damage mechanisms near crack-tip were analyzed. It was found that fine grains tended to have lower transition rate down to the near-threshold regime due to the interaction of cyclic plasticity and microstructures, which promoted the formation of nanovoids, nanograins, and amorphization near crack-tip. A modified Zhu-Xuan model was established by taking into account the local microhardness and stress ratios. These findings underscore the importance of grain size engineering in enhancing fatigue resistance and show promise for streamlining the fatigue threshold testing process, thereby reducing associated time and costs.

粗晶材料在损伤容限设计中被认为具有更高的疲劳阈值，在这种情况下，细晶控制疲劳裂纹扩展的机制尚不清楚。本文研究了L907A钢微米级（~ 2.5 μm）晶粒焊接接头的近阈值疲劳裂纹扩展行为，并分析了裂纹尖端附近的损伤机制。结果表明，由于循环塑性和微观组织的相互作用，细晶向近阈值区转变的速率较低，促进了裂纹尖端附近纳米孔洞、纳米晶粒的形成和非晶化。考虑了局部显微硬度和应力比，建立了修正的Zhu-Xuan模型。这些发现强调了晶粒尺寸工程在提高抗疲劳性能方面的重要性，并显示出简化疲劳阈值测试过程的希望，从而减少了相关的时间和成本。

引用次数: 0

Microstructure, texture and fatigue performance of friction stir welded dissimilar magnesium alloy joints 异种镁合金搅拌摩擦焊接接头的组织、织构及疲劳性能

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2026-06-01 Epub Date: 2025-12-18 DOI: 10.1016/j.ijfatigue.2025.109450

M. Niewczas , F.G. Basmaji , A. Kula

The stress-controlled fatigue of dissimilar friction stir welded AZ80/AZ61 and AZ80/AZ31 magnesium alloy joints was studied. Fatigue testing targeting the critical stir zone — base metal interface revealed endurance limits of 90 MPa for AZ80/AZ61 welds and 70 MPa for AZ80/AZ31 welds. Within the range 60–90 mm/min, welding speed did not affect the endurance limits, though lower speeds produced more homogeneous microstructures and reduced data scatter in AZ80/AZ61 joints. The superior fatigue resistance of AZ80/AZ61 welds is attributed to their stronger and more plastically uniform microstructure, which supports higher stress levels and sustains more cycles before crack nucleation. Cyclic stress–strain analysis shows that AZ80/AZ31 joints exhibit higher hardening rates under cyclic loading compared to AZ80/AZ61 joints, however, both joint types demonstrate significantly reduced hardening compared to monotonic tensile deformation. This behaviour is attributed to low plastic strains during cycling, texture effects inhibiting basal slip, and reversible twinning–detwinning mechanisms. Electron backscatter diffraction analysis revealed substantial texture evolution in the stir zone (SZ), thermomechanically affected (TMAZ) and heat-affected zones (HAZ), with mechanical twinning contributing to grain refinement and mechanical anisotropy. Transmission electron microscopy revealed a complex fatigue dislocation microstructure characterized by networks of basal and non-basal dislocations, with fine dislocation loops and debris present at all stress amplitudes. The density of these defects increased systematically with stress amplitude, providing insight into the cyclic deformation mechanisms governing fatigue life.

研究了不同搅拌摩擦焊接AZ80/AZ61和AZ80/AZ31镁合金接头的应力控制疲劳。针对临界搅拌区-母材界面的疲劳试验表明，AZ80/AZ61焊缝的耐受力极限为90 MPa， AZ80/AZ31焊缝的耐受力极限为70 MPa。在60 ~ 90 mm/min范围内，焊接速度对AZ80/AZ61接头的耐久极限没有影响，但较低的焊接速度使AZ80/AZ61接头的组织更加均匀，数据散射减少。AZ80/AZ61焊缝具有优异的抗疲劳性能，其显微组织更强，塑性更均匀，在裂纹成核前可以承受更高的应力水平，并能维持更多的循环。循环应力应变分析表明，与AZ80/AZ61接头相比，AZ80/AZ31接头在循环加载下的硬化速率更高，但与单调拉伸变形相比，两种接头的硬化程度均显著降低。这种行为归因于循环过程中的低塑性应变、抑制基底滑移的织构效应以及可逆的孪生-去孪生机制。电子背散射衍射分析显示，在搅拌区（SZ）、热影响区（TMAZ）和热影响区（HAZ）存在明显的织构演变，机械孪晶有助于晶粒细化和力学各向异性。透射电镜显示，复合疲劳位错微观结构以基底位错和非基底位错网络为特征，在所有应力幅值下均存在细小的位错环和碎片。这些缺陷的密度随着应力幅值的增加而系统地增加，这为了解控制疲劳寿命的循环变形机制提供了线索。

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引用次数: 0

Data driven topology optimization of AM parts accounting for process-affected fatigue performance: Application to automotive and aerospace components 考虑工艺影响疲劳性能的增材制造零件的数据驱动拓扑优化：在汽车和航空航天部件上的应用

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2026-05-01 Epub Date: 2026-01-07 DOI: 10.1016/j.ijfatigue.2026.109481

Alessio Centola , Alberto Ciampaglia , Carlo Boursier Niutta , Filippo Berto , Davide Salvatore Paolino , Andrea Tridello

The present paper presents two novel data-driven topology optimization (TO) procedures to design lighter additively manufactured (AM) fatigue resistant components. The first TO method is driven by a probabilistic machine learning (ML) algorithm based on a Bayesian Neural Network (BNN), trained on fatigue data from the literature to assess probabilistic stress-life (PSN) curves. These curves are used to predict the allowable design stress for TO and are predicted directly from AM process parameters, the risk volume, and thermal and surface treatments. The second TO design procedure is instead driven by another BNN, trained to predict the maximum critical defect size from the process parameters. The TO limit stress is computed from the predicted critical defect and the threshold stress intensity factor K_th. After the TO, the critical stress intensity factor K_I in the component is computed and compared against K_th, to assess the effectiveness of this design procedure. These two frameworks are applied to the design of an SS316L automotive suspension lower control arm and a Ti6Al4V aerospace bracket, respectively. With the following framework, the limit stress calculation does not require specifically designed experimental campaigns and prototyping, as previously sparse experimental knowledge can be embedded in a powerful design tool, which allows for preventing fatigue failures, while accounting directly for the influence of the AM process parameters.

本文提出了两种新的数据驱动拓扑优化（TO）方法来设计更轻的增材制造（AM）抗疲劳部件。第一种TO方法由基于贝叶斯神经网络（BNN）的概率机器学习（ML）算法驱动，该算法根据文献中的疲劳数据进行训练，以评估概率应力寿命（PSN）曲线。这些曲线用于预测to的允许设计应力，并直接从增材制造工艺参数、风险体积、热处理和表面处理中进行预测。第二个TO设计程序由另一个BNN驱动，该BNN经过训练，可以从工艺参数中预测最大临界缺陷尺寸。根据预测的临界缺陷和阈值应力强度因子Kth计算极限应力。在TO之后，计算组件中的临界应力强度因子KI并与Kth进行比较，以评估该设计过程的有效性。这两种框架分别应用于SS316L汽车悬架下控制臂和Ti6Al4V航空航天支架的设计。有了下面的框架，极限应力计算不需要专门设计的实验活动和原型，因为以前稀疏的实验知识可以嵌入到一个强大的设计工具中，这可以防止疲劳失效，同时直接考虑到增材制造工艺参数的影响。

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引用次数: 0