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Frequency-based approach for fatigue life analysis of SLM high-strength aluminum alloys 基于频率的SLM高强铝合金疲劳寿命分析方法
IF 5.3 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-21 DOI: 10.1016/j.engfracmech.2026.111866
Yuqi Yang, Haibiao Yin, Weixing Yao, Zuoting Liu
High-strength aluminum alloys manufactured by Selective Laser Melting (SLM) technology are widely used in high-performance aerospace components due to their combination of high strength, low density, and excellent corrosion resistance. This study investigates the high-cycle fatigue (HCF) behavior of SLM-manufactured TiB2-Al (FCA101Y-1) and AlMgScZr high-strength aluminum alloys under vibrational loading. A frequency-based approach is proposed for fatigue life prediction given the strong correlation between natural frequency variation and damage accumulation. The approach accounts for the influence of fracture surface defects, characterized and analyzed through Scanning Electron Microscopy (SEM) and Optical Microscopy (OM). Model calculation results indicate that crack growth and brittle fracture stages account for approximately 80% and 20% of the total fatigue life of SLM aluminum alloys, respectively. This approach has proven reliable, as the predicted fatigue lives fall within a factor-of-two scatter band and coefficient of determination R2 is all around 0.9.
采用选择性激光熔化(SLM)技术制造的高强度铝合金具有高强度、低密度和优异的耐腐蚀性,广泛应用于高性能航空航天部件中。研究了slm制造的TiB2-Al (FCA101Y-1)和AlMgScZr高强度铝合金在振动载荷下的高周疲劳行为。考虑到固有频率变化与损伤累积之间的强相关性,提出了一种基于频率的疲劳寿命预测方法。该方法考虑了断口表面缺陷的影响,并通过扫描电镜(SEM)和光学显微镜(OM)对其进行了表征和分析。模型计算结果表明,裂纹扩展阶段和脆性断裂阶段分别约占SLM铝合金总疲劳寿命的80%和20%。该方法已被证明是可靠的,因为预测的疲劳寿命落在2因子散射带内,决定系数R2都在0.9左右。
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引用次数: 0
Comprehensive mechanical evaluation of heat-treated AISI 4140 (ETD 150): fatigue behavior and novel indentation-based characterization of fracture toughness and hardness with relevance to rail steels 热处理AISI 4140 (etd150)的综合力学评价:疲劳行为和与轨道钢相关的基于压痕的断裂韧性和硬度的新表征
IF 5.3 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-20 DOI: 10.1016/j.engfracmech.2026.111874
S.I. Okocha , M.T. Hendry , P.Y.B. Jar
This study investigates the fracture toughness (KJC) and hardness of heat-treated, cold-drawn AISI 4140 alloy (“e.t.d” 150) alongside three representative rail steels (JP, EV, and CZ) to comparatively evaluate their mechanical performance. Importance is placed on “e.t.d” 150 to assess its potentiality as a viable alternative material for rail steel applications based on current insights to rail steel material recycling and substitution. Fracture toughness (KJC) was assessed using a chamfered cylindrical flat-end and spherical indenter based on a novel virtual J-integral approach that minimizes the plastic J-integral component based on Irwin’s elastic solution, while hardness was obtained using only spherical indentation. A comparison between the KJC outcomes of both indenters are presented and discussed, showing preference to spherical indentation. The virtual J-integral approach with limit load analysis applied for estimating KJC in both indenters, incorporated stress triaxiality to account for pressure sensitivity and the hydrostatic pressure component in indentation testing. Results show that “e.t.d” 150 achieves fracture toughness and Brinell hardness values comparable to rail steels, particularly suitable for curved track sections where wear resistance and durability are critical. Fatigue analysis was also conducted for “e.t.d” 150, which confirms moderate-to-good resistance to rolling contact fatigue. These findings suggest that “e.t.d” 150 offers a reliable alternative for substituting conventional rail steels, with potential benefits for railway performance, safety, and maintenance cost reduction.
本文研究了热处理冷拔AISI 4140合金的断裂韧性(KJC)和硬度。d“150”)与三种具有代表性的钢轨钢(JP, EV和CZ)比较,比较其机械性能。“e.t.”很重要。D ' 150,根据目前对轨道钢材料回收和替代的见解,评估其作为轨道钢应用的可行替代材料的潜力。断裂韧性(KJC)是使用倒角圆柱平端和球面压头进行评估的,该方法基于一种新颖的虚拟j积分方法,该方法基于Irwin弹性解最小化了塑性j积分分量,而硬度仅使用球面压头获得。两种压痕的KJC结果之间的比较提出和讨论,显示偏爱球形压痕。虚拟j积分方法和极限载荷分析应用于估计压痕的KJC,结合应力三轴性来考虑压痕测试中的压力敏感性和静水压力分量。结果表明:“e.t.。d ' 150具有与钢轨钢相当的断裂韧性和布氏硬度值,特别适用于对耐磨性和耐久性至关重要的弯曲轨道部分。对“e.t.”进行了疲劳分析。D ' 150,具有中等到良好的抗滚动接触疲劳性能。这些发现表明,《e.t.外星人》D”150提供了替代传统钢轨的可靠选择,具有提高铁路性能、安全性和降低维护成本的潜在优势。
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引用次数: 0
A dislocation density-based crystal plasticity finite element analysis of cyclic softening behavior of AISI H13 steel under isothermal fatigue AISI H13钢等温疲劳循环软化行为的位错密度晶体塑性有限元分析
IF 5.3 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-20 DOI: 10.1016/j.engfracmech.2026.111870
Boya Wu , Meichen Liu , Shangyi Dai , Junwan Li , Xiaochun Wu
This study reveals the cyclic softening mechanisms of AISI H13 steel under isothermal fatigue at 600°C through experimental characterization and dislocation density-based crystal plasticity finite element method. Experiments demonstrate that AISI H13 steel exhibits three distinct softening stages within the strain amplitude range of 0.5–1.1%, namely rapid softening, transitional softening, and steady softening. Microstructural analysis reveals that with increasing cycles, the softening phenomenon intensifies, with dislocation density continuously decreasing from rapid to slow rates, accompanied by the coarsening of carbides. Accordingly, a dislocation density-based crystal plasticity model coupling realistic martensitic lath block structures and damage evolution was developed to reveal cyclic softening mechanisms, achieving hysteresis loop predictions with errors below 5%. The model reveals the dominant role of statistically stored dislocations (SSD) in cyclic softening, with SSD density decreasing from 1.68 × 103 to 1.53 × 103 μm−2 within the first five cycles. This non-uniform recovery process generates stress concentration in high SSD regions and strain localization in low SSD regions, leading to strong coupling between damage and plastic strain that drives progressive steel degradation. Simulation results further demonstrate that increasing strain amplitude from 0.5% to 1.1% significantly enhances strain localization, with accumulated plastic strain in localized regions reaching 0.5 at the 5th cycle under high amplitude compared to merely 0.002 under low amplitude. This heterogeneity accelerates damage evolution, with damage variables exceeding 0.15 in critical regions at 1.1% strain amplitude while remaining zero at 0.5%, ultimately reducing fatigue life from 650 to 214 cycles and promoting secondary crack formation near primary crack tips.
本研究通过实验表征和基于位错密度的晶体塑性有限元法揭示了AISI H13钢在600℃等温疲劳下的循环软化机理。试验表明,AISI H13钢在0.5 ~ 1.1%应变幅值范围内呈现出快速软化、过渡软化和稳定软化三个阶段。显微组织分析表明,随着循环次数的增加,软化现象加剧,位错密度由快变慢不断降低,碳化物逐渐变粗。因此,建立了一个基于位错密度的晶体塑性模型,该模型结合了真实马氏体板条块结构和损伤演化,揭示了循环软化机制,实现了误差低于5%的滞后回路预测。该模型揭示了统计存储位错(SSD)在循环软化中的主导作用,在前5次循环中,SSD密度从1.68 × 103 μm−2下降到1.53 × 103 μm−2。这种不均匀的恢复过程在高SSD区域产生应力集中,在低SSD区域产生应变局部化,导致损伤和塑性应变之间的强耦合,从而驱动钢的渐进退化。仿真结果进一步表明,应变幅值从0.5%增加到1.1%显著增强了应变局部化,高幅值下第5次循环局部化区域累积塑性应变达到0.5,而低幅值下仅为0.002。这种非均质性加速了损伤演化,当应变幅值为1.1%时,损伤变量在临界区域超过0.15,而当应变幅值为0.5%时,损伤变量为零,最终将疲劳寿命从650次循环降低到214次循环,并促进主裂纹尖端附近的二次裂纹形成。
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引用次数: 0
A novel ring specimen for fatigue crack growth rate testing of rubber with full-cycle crack length monitoring 一种新型的橡胶疲劳裂纹扩展速率环样及全周期裂纹长度监测
IF 5.3 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-20 DOI: 10.1016/j.engfracmech.2026.111875
Weidong Liu , Ya Xu , Yu Liu , Chi Zhang , Qiushi Zhang , Jiyuan Cui
Conventional fatigue crack growth rate (FCGR) testing is constrained by limited specimen geometries and digital image correlation (DIC) technical restrictions, hindering its application to multiaxial loading conditions. This study proposes a novel ring specimen (RS) for FCGR testing. By establishing an analytical relationship between its unique equivalent force arm and crack length, and analyzing the sensitivity boundaries of this mapping mechanism regarding crack angle and tensile strain, a force/torque-sensor-based method for full-cycle crack monitoring was achieved. The results demonstrate that the RS maintains mechanical equivalence to standard specimens while extending the effective testing zone 6.5-fold. The equivalent force arm-crack length mapping model shows high robustness, with the gradient relative error remaining below 2% within reasonable variations in crack angle and strain. The RS method yields FCGRs within factor-of-two scatter bands of the standard DIC method, with Paris law parameter errors below 3% without compromising testing efficiency. This research overcomes limitations in DIC and specimen geometry to achieve full-cycle crack monitoring, offering a novel strategy for in situ monitoring of rubber crack propagation under multiaxial loading conditions.
传统的疲劳裂纹扩展速率(FCGR)测试受到试样几何形状和数字图像相关(DIC)技术的限制,阻碍了其在多轴加载条件下的应用。本研究提出了一种新型环形试样(RS)用于FCGR试验。通过建立其独特的等效力臂与裂纹长度之间的解析关系,分析该映射机构对裂纹角和拉伸应变的灵敏度边界,实现了基于力/扭矩传感器的全周期裂纹监测方法。结果表明,RS在将有效试验区域扩大6.5倍的同时,保持了与标准试件的力学等效性。等效力臂-裂纹长度映射模型具有较强的鲁棒性,在合理的裂纹角度和应变变化范围内,梯度相对误差保持在2%以下。RS方法产生的fcgr在标准DIC方法的两倍散射带内,在不影响测试效率的情况下,巴黎定律参数误差低于3%。该研究克服了DIC和试样几何形状的限制,实现了全周期裂纹监测,为多轴加载条件下橡胶裂纹扩展的原位监测提供了一种新的策略。
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引用次数: 0
Nonlocal anisotropic damage modeling enabled by the multidimensional quasi-bond approach 基于多维准键方法的非局部各向异性损伤建模
IF 5.3 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-20 DOI: 10.1016/j.engfracmech.2026.111877
Wei-Jian Li , Yan-Liang Du , Qi-Zhi Zhu , Leong Hien Poh
Fracture in quasi-brittle materials initiates as a diffuse network of microcracks that evolve anisotropically and progressively coalesce into macroscopic cracks. To accurately represent this process, a novel nonlocal anisotropic damage model is proposed. It is based on the multidimensional quasi-bond framework enriched with both shear and transverse deformation mechanisms. The model successfully captures microcrack–matrix interactions, offering superior capability for simulating crack propagation compared to conventional bond-based models. By incorporating direction-dependent deformations evaluated over multiple interaction domains to assess bond damage, the model integrates anisotropic damage evolution with the nonlocal interaction effects of microcracks. Consequently, it effectively eliminates mesh dependence in predicting crack paths and material softening responses, while also preventing spurious damage growth often encountered in conventional nonlocal integral or gradient-enhanced models. Benchmark tests demonstrate that the proposed approach, without resorting to complex constitutive models, accurately captures combined tensile and shear fracture behaviors in quasi-brittle materials under complex loading conditions.
准脆性材料的断裂始于一个扩散的微裂纹网络,这些微裂纹网络向各向异性演化,并逐渐合并为宏观裂纹。为了准确地描述这一过程,提出了一种新的非局部各向异性损伤模型。它以多维准键框架为基础,丰富了剪切和横向变形机制。与传统的基于粘结的模型相比,该模型成功地捕获了微裂纹-基体的相互作用,提供了更好的模拟裂纹扩展的能力。该模型通过引入在多个相互作用域中评估的方向相关变形来评估粘结损伤,将各向异性损伤演化与微裂纹的非局部相互作用效应相结合。因此,它有效地消除了预测裂纹路径和材料软化响应时对网格的依赖,同时也防止了传统非局部积分或梯度增强模型中经常遇到的虚假损伤增长。基准试验表明,该方法在不依赖复杂本构模型的情况下,能够准确捕捉复杂加载条件下准脆性材料的拉伸和剪切联合断裂行为。
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引用次数: 0
Online crack propagation prediction for tubular joints of offshore jacket platforms using a hybrid physics-informed neural network 基于混合物理信息的神经网络在线预测海上导管架平台管接头裂纹扩展
IF 5.3 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-19 DOI: 10.1016/j.engfracmech.2026.111868
Jiancheng Leng , Zitong Chen , Zikai Jia , Haolong Wu , Hangze Guo
To address the challenges of accurately and efficiently predicting crack propagation in tubular joints of offshore jacket platforms, this study proposes a hybrid physics-informed neural network method that integrates data -driven modeling with physical laws. First, stress analysis of the structure under extreme storm loads is performed using ANSYS to extract the maximum principal stress in critical areas. Subsequently, Franc3D simulations are conducted to obtain corresponding data on stress intensity factors and crack lengths. This data is used to construct a multilayer perceptron surrogate model, which predicts the SIF from the maximum principal stress and crack length. Next, the Paris law is discretized via the forward Euler method and embedded into a recurrent neural network to create a PINN for modeling temporal crack growth. Furthermore, a hybrid PINN model is established by replacing the parameters in the Paris law with the developed surrogate model. The model’s performance is enhanced through hyperparameter optimization using random and grid search. Comparative studies with standalone MLP and LSTM models demonstrate the superiority of the proposed hybrid PINN, achieving a MAPE of only 2.27%, which represents improvements of 31.38% and 25.33% over the MLP and LSTM models, respectively. Additional evaluation using a test set assessed the model’s safety warning capability in critical crack fracture failure scenarios. The results indicate that the remaining life estimates and safety warnings fall within the 95% confidence interval, verifying the model’s robustness and reliability. This work presents a novel solution for assessing fatigue cracks in marine engineering structures.
为了解决准确有效地预测海上导管架平台管接头裂纹扩展的挑战,本研究提出了一种混合物理信息的神经网络方法,该方法将数据驱动建模与物理定律相结合。首先,利用ANSYS软件对极端风暴荷载作用下的结构进行应力分析,提取关键区域的最大主应力;随后进行Franc3D模拟,得到相应的应力强度因子和裂纹长度数据。该数据用于构建多层感知器代理模型,该模型根据最大主应力和裂纹长度预测SIF。接下来,通过前向欧拉方法将Paris定律离散化,并嵌入到递归神经网络中,以创建用于建模时间裂纹扩展的PINN。在此基础上,用所建立的替代模型代替巴黎定律中的参数,建立了混合PINN模型。通过使用随机和网格搜索进行超参数优化,提高了模型的性能。与独立的MLP和LSTM模型的比较研究表明,所提出的混合PINN模型的MAPE仅为2.27%,比MLP和LSTM模型分别提高了31.38%和25.33%。另外,通过测试集评估了该模型在关键裂纹破裂情况下的安全预警能力。结果表明,剩余寿命估计值和安全预警值均在95%置信区间内,验证了模型的稳健性和可靠性。本文提出了一种评估海洋工程结构疲劳裂纹的新方法。
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引用次数: 0
Characteristic regions for the fracture surface of interior crack initiation in the outer ring raceway of railway bearing 铁路轴承外圈滚道内裂纹萌生断裂面特征区域
IF 5.3 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-19 DOI: 10.1016/j.engfracmech.2026.111869
Xiaolong Liu , Kelian Luo , Qiang Chen , Dunxin Wang , Haibo Xiang , Rubing Guo , Xi Wang
Interior crack initiation prevails in the failure mode of railway bearings. Three characteristic regions, i.e., Inclusion, Fish-eye, and zig-zag cracks, were first defined on the fracture surface of interior crack initiation, indicating the interior crack initiation and propagation mechanism. The inclusion clusters are primarily Al2O3, with the diameters ranging from approximately 5–15 µm. Fish-eye formed during the crack initiation stage. No grain refinement was observed during this stage, suggesting that no white etching cracks developed. Zig-zag cracks exhibited larger dimensions along the major axis and smaller, denser structures along the minor axis. The crack path deflects during the propagation of mixed Mode II-III cracks, resulting in the characteristic zig-zag morphology. Based on these results, a mechanism for interior crack initiation and propagation in the outer raceway of railway bearings was proposed. These findings advance the understanding of very-high-cycle fatigue under rolling contact loading, offering critical insights for optimizing bearing design and lifespan prediction in rail transport systems.
铁路轴承破坏模式以内部裂纹萌生为主。首次在内裂纹起裂断面上定义了夹杂裂纹、鱼眼裂纹和锯齿形裂纹三个特征区域,揭示了内裂纹的起裂和扩展机制。包裹团簇主要为Al2O3,直径约为5-15µm。鱼眼在裂纹萌生阶段形成。在此阶段未观察到晶粒细化,表明没有形成白色腐蚀裂纹。锯齿形裂纹沿长轴尺寸较大,沿短轴结构较小且密度较大。II-III型混合裂纹扩展过程中,裂纹路径发生偏转,形成典型的锯齿形裂纹形态。在此基础上,提出了铁路轴承外滚道内部裂纹萌生和扩展的机理。这些发现促进了对滚动接触载荷下的高周疲劳的理解,为优化铁路运输系统的轴承设计和寿命预测提供了重要见解。
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引用次数: 0
Plastic zone size and crack tip opening displacement of doubly periodic Dugdale cracks with diamond-shaped-interleaving arrays under longitudinal shear 纵向剪切作用下菱形交错双周期Dugdale裂纹的塑性区尺寸和裂纹尖端张开位移
IF 5.3 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-16 DOI: 10.1016/j.engfracmech.2026.111845
Yan Li , Pengpeng Shi , Xiaofan Gou , Wenshuai Wang , Xing Li
The interaction among multiple cracks plays a crucial role in the elastoplastic fracture behavior of materials. Although numerous studies have been devoted to elastic analyses of doubly periodic crack problems, the elastoplastic response of complex configurations such as doubly periodic cracks with diamond-shaped-interleaving arrays remains insufficiently explored. This paper investigates the plastic zone size (PZS) and crack tip opening displacement (CTOD) of doubly periodic cracks with diamond-shaped-interleaving arrays (DPC-DSIA) under longitudinal shear. Based on the Dugdale plastic zone model and the continuously distributed dislocation model, the mixed-boundary-value problem of elastoplastic behavior for DPC-DSIA configurations is transformed into a system of singular integral equations, where the semi-analytical solution is achieved using the Lobatto-Chebyshev numerical quadrature method. The accuracy of the proposed solution is verified against existing results for two typical periodic cracks with rectangular arrays and diamond-shaped arrays and the complex periodic cracks with diamond-shaped-interleaving small arrays. Furthermore, the influence of periodic parameters on key fracture quantities, including the PZS, CTOD, and stress intensity factor (SIF), are systematically examined. The results reveal the interaction mechanism between vertically and horizontally oriented cracks and highlight the complex effects of doubly periodic crack arrangements on the system’s elastoplastic behavior.
多裂纹之间的相互作用对材料的弹塑性断裂行为起着至关重要的作用。尽管对双周期裂纹问题的弹性分析已经有了大量的研究,但对具有菱形交错排列的双周期裂纹等复杂结构的弹塑性响应研究还不够。研究了菱形交错阵列双周期裂纹在纵向剪切作用下的塑性区尺寸(PZS)和裂纹尖端张开位移(CTOD)。基于Dugdale塑性区模型和连续分布位错模型,将DPC-DSIA构形弹塑性行为混合边值问题转化为奇异积分方程组,利用Lobatto-Chebyshev数值求积分法得到半解析解。通过对矩形阵和菱形阵两种典型周期裂纹以及菱形交错小阵复杂周期裂纹的分析,验证了所提方法的准确性。此外,系统地研究了周期参数对关键裂缝量的影响,包括PZS、CTOD和应力强度因子(SIF)。结果揭示了垂直和水平取向裂纹之间的相互作用机制,并突出了双周期裂纹排列对体系弹塑性行为的复杂影响。
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引用次数: 0
Phase-field modelling of quasi-static and dynamic brittle fracture: A FreeFEM++ implementation 准静态和动态脆性断裂的相场建模:FreeFEM++实现
IF 5.3 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-15 DOI: 10.1016/j.engfracmech.2026.111846
Andres F. Galvis
This work presents a robust phase-field formulation for brittle fracture, combining a quasi-monolithic solution strategy with a frozen history field, Houbolt time integration for dynamic/transient regimes, and adaptive remeshing in FreeFEM++. This approach enhances numerical robustness, simplifies parameter calibration, and facilitates extensions to multi-physics fracture problems. Despite widespread interest, building on this framework, a key contribution is the first open serial implementation of this framework in FreeFEM++, offering advantages in mesh adaptivity, solver flexibility, and concise variational syntax. The mesh adaptivity feature concentrates resolution near evolving crack tips to efficiently capture fracture evolution. The implementation is validated on standard benchmarks, showing close agreement with reference crack paths, load–displacement, and dissipated energy responses. By releasing a concise, well-documented FreeFEM++ code, this work bridges a reproducibility gap and establishes a methodological foundation for future developments.
这项工作提出了一个强大的脆性断裂相场公式,结合了准单片解策略和冻结历史场,动态/瞬态状态的Houbolt时间积分,以及FreeFEM++中的自适应网格划分。该方法增强了数值鲁棒性,简化了参数校准,便于扩展到多物理场裂缝问题。尽管有广泛的兴趣,在这个框架的基础上,一个关键的贡献是在FreeFEM++中第一个开放的串行实现这个框架,提供网格适应性,求解器灵活性和简洁的变分语法方面的优势。网格自适应特征将分辨率集中在演化裂纹尖端附近,从而有效地捕捉裂缝演化过程。在标准基准测试中验证了该实现,显示与参考裂缝路径、荷载-位移和耗散能量响应密切一致。通过发布一个简明的、文档完备的FreeFEM++代码,这项工作弥补了可再现性的差距,并为未来的开发建立了方法论基础。
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引用次数: 0
The Capriccio method as a versatile tool for quantifying the fracture properties of glassy materials under complex loading conditions with chemical specificity Capriccio方法是一种多功能的工具,用于量化玻璃材料在复杂载荷条件下的断裂特性,具有化学特异性
IF 5.3 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-13 DOI: 10.1016/j.engfracmech.2026.111841
Felix Weber , Maxime Vassaux , Lukas Laubert , Sebastian Pfaller
Molecular dynamics (MD) simulations are widely used to provide insights into fracture mechanisms while maintaining chemical specificity. However, particle-based techniques such as MD are limited in terms of accessible length scales and applicable boundary conditions, which restricts the investigation of fracture phenomena in typical engineering settings. In an attempt to overcome these limitations, we apply the partitioned-domain Capriccio method to couple atomistic MD samples representing silica glass with the finite element (FE) method. With this approach, we perform mode I (rectangular panel under tension, three-, and four-point bending), mode II as well as mode III (rectangular panel under in-plane or out-of-plane shear) simulations. Thereby, we investigate multiple criteria to identify the onset of crack propagation based on the virial stress, the number of pair interactions, the kinetic energy/temperature, the crack velocity, and the crack opening displacement. It becomes apparent that the maximum virial stress can actually serve as an objective and meaningful indicator for the start of crack growth, in contrast to, for example, the temperature evolution The approach presented provides quantitatively plausible results for the critical stress intensity factors KIc, KIIc, and KIIIc. This contribution shows that the Capriccio method is a flexible means of performing fracture simulations that take into account boundary conditions typical of experimental test setups with atomistic specificity near the crack tip. While also pointing out the current limitations of the Capriccio method, we demonstrate its potential to integrate atomistic insights into FE models with significantly larger overall dimensions.
分子动力学(MD)模拟被广泛用于在保持化学特异性的同时提供对裂缝机制的深入了解。然而,基于颗粒的技术(如MD)在可获得的长度尺度和适用的边界条件方面受到限制,这限制了典型工程环境中裂缝现象的研究。为了克服这些限制,我们应用分域Capriccio方法将原子MD样品与有限元(FE)方法耦合在一起。通过这种方法,我们执行模式I(矩形面板在张力,三点和四点弯曲下),模式II和模式III(矩形面板在面内或面外剪切下)模拟。因此,我们研究了基于维里应力、对相互作用次数、动能/温度、裂纹速度和裂纹张开位移的多重准则来识别裂纹扩展的开始。很明显,与温度演变等因素相比,最大虚拟应力实际上可以作为裂纹扩展开始的客观和有意义的指标。本文提出的方法为临界应力强度因子KIc, KIIc和KIIIc提供了定量可信的结果。这表明,Capriccio方法是一种灵活的断裂模拟方法,它考虑了裂纹尖端附近具有原子特异性的实验测试设置的典型边界条件。在指出Capriccio方法目前的局限性的同时,我们展示了它将原子的洞察力集成到具有更大总体维度的FE模型中的潜力。
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引用次数: 0
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Engineering Fracture Mechanics
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