Theoretical and Applied Fracture Mechanics最新文献_第7页

Effect of surface roughness on acousto-optic characteristics and energy evolution of cracked concrete-sandstone 表面粗糙度对裂缝混凝土-砂岩声光特性及能量演化的影响

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics

Pub Date : 2025-12-17 DOI: 10.1016/j.tafmec.2025.105407

Yu Zhao, Xiaojiang Deng, Mingxuan Shen, Jing Bi, Chaolin Wang, Yongfa Zhang, Yang Li, Lin Ning

Concrete-rock interfaces are commonly encountered in civil engineering applications, where structural defects and interfacial instability may lead to significant safety risks. This study investigates the fracture behavior of concrete-sandstone composite specimens under varying interface roughness and inclination angles. The crack stress evolution, including crack closure stress, crack initiation stress, crack coalescence stress, and peak stress, was evaluated using acoustic emission (AE)-based micro-fracture theory and energy analysis. Digital image correlation (DIC) was employed to monitor strain field variations at each critical stress stage. Furthermore, macroscopic failure patterns under different interface conditions were comparatively analyzed using both conventional crack classification methods and a Gaussian mixture model-based clustering approach based on RA-AF characteristics. The results indicate that, in the traditional crack classification approach, tensile cracks account for more than 90 % of the cracks observed in specimens with varying interface roughness and inclination angles, suggesting a relatively simple failure mechanism. In contrast, the crack classification based on Gaussian mixture clustering reveals a tensile-shear mixed failure mode, which aligns more closely with the macroscopic failure behavior of the specimens. Furthermore, significant variations in AE amplitude entropy, AE average frequency entropy, and AE energy entropy are observed across the four stress stages preceding specimen failure, demonstrating their potential as precursor indicators for failure in concrete-rock interfaces

混凝土-岩石界面是土木工程应用中经常遇到的问题，其结构缺陷和界面失稳可能导致重大的安全风险。研究了不同界面粗糙度和倾角下混凝土-砂岩复合试件的断裂行为。利用声发射微破裂理论和能量分析对裂纹应力演化过程进行了评价，包括裂纹闭合应力、裂纹起裂应力、裂纹合并应力和峰值应力。采用数字图像相关（DIC）技术监测各临界应力阶段的应变场变化。采用常规裂纹分类方法和基于RA-AF特征的高斯混合模型聚类方法，对比分析了不同界面条件下的宏观破坏模式。结果表明：在不同界面粗糙度和倾角试样中，传统的裂纹分类方法中，拉伸裂纹占90%以上，其破坏机制相对简单；而基于高斯混合聚类的裂纹分类则呈现出拉剪混合破坏模式，更符合试件的宏观破坏行为。此外，在试件破坏前的四个应力阶段，声发射振幅熵、声发射平均频率熵和声发射能量熵均有显著变化，表明它们可能是混凝土-岩石界面破坏的前兆指标

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引用次数: 0

A critical assessment of J-integral and CBBM validity in fracture characterization of brittle, ductile, and flexible adhesives j积分和CBBM在脆性、韧性和柔性胶粘剂断裂表征中的有效性的关键评估

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics

Pub Date : 2025-12-17 DOI: 10.1016/j.tafmec.2025.105395

B.G.A. Reket , A. Akhavan-Safar , B. Hasumi , M. Ferreira , B.D. Simões , V.C.M.B. Rodrigues , R.J.C. Carbas , E.A.S. Marques , O. van der Sluis , L.F.M. da Silva

Fracture characterization methods across adhesives from brittle to highly ductile reveals critical inconsistencies in widely accepted approaches, namely J-integral and Compliance-Based Beam Method (CBBM). While both methods are generally considered acceptable for fracture analysis across various adhesive types, this work demonstrates that such assumptions can be misleading and potentially unsafe. Using Double Cantilever Beam (DCB) specimens, the fracture energy during crack propagation was evaluated for each method. The results reveal a previously underexplored limitation: both methods exhibit major discrepancies when applied to adhesives with significant plasticity, with fracture energy differences reaching up to 50%, and even higher for highly flexible systems. Critically, the study shows that the use of an inappropriate data reduction method can significantly overestimate or underestimate fracture energy, potentially leading to over-conservative or dangerously non-conservative joint designs. Despite being based on linear elastic fracture mechanics (LEFM), CBBM consistently outperformed the more general J-integral by producing equivalent crack lengths that closely reflect the effect of fracture process zone. In contrast, the J-integral method was found to underestimate fracture energy in highly ductile adhesives due to its inability to capture the full extent of the plastic zone. This work is the first to quantitatively demonstrate these risks and method-dependent inaccuracies across a wide range of adhesive systems, providing a clear recommendation for CBBM in cases of highly ductile and flexible adhesives. These findings offer important practical guidance for researchers and engineers seeking reliable fracture characterization in the design of adhesively bonded structures.

从脆性到高延性胶粘剂的断裂表征方法揭示了广泛接受的方法（即j积分和基于柔度的梁法（CBBM））的严重不一致性。虽然这两种方法通常被认为是可以接受的，但这项工作表明，这种假设可能会产生误导，并且可能不安全。采用双悬臂梁（DCB）试件，对两种方法在裂纹扩展过程中的断裂能进行了计算。结果揭示了以前未被充分开发的局限性：当应用于具有显著塑性的粘合剂时，两种方法都表现出很大的差异，断裂能差异可达50%，对于高度柔性的系统甚至更高。至关重要的是，该研究表明，使用不适当的数据简化方法可能会严重高估或低估裂缝能量，从而可能导致过度保守或危险的非保守关节设计。尽管CBBM是基于线弹性断裂力学（LEFM），但它产生的等效裂纹长度更能反映断裂过程带的影响，从而优于更一般的j积分。相比之下，j积分法被发现低估了高延性胶粘剂的断裂能，因为它无法捕捉塑性区的全部范围。这项工作是第一次在广泛的粘合剂系统中定量地证明这些风险和方法相关的不准确性，为高延展性和柔性粘合剂的CBBM提供了明确的建议。这些发现为研究人员和工程师在粘连结构设计中寻求可靠的断裂特征提供了重要的实用指导。

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引用次数: 0

Study on macro-micro fracture deterioration of coal under simulated abandoned mine water conditions with varying temperature and duration 不同温度和持续时间下模拟废弃矿井水条件下煤的宏微观破裂恶化研究

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics

Pub Date : 2025-12-16 DOI: 10.1016/j.tafmec.2025.105406

Yang Shen , Baiquan Lin , Minghua Lin , Zhiyong Hao , Ting Liu , Wei Yang

The fracture zone of abandoned mine is prone to Mode-I failure under the influence of tension. The corrosive abandoned mine water will erode the rock mass, accelerate the process of tension failure, and affect the stability of underground space and the efficiency of development. Previous studies shown that long-term mine water rock contact have an obviously impact on the macro mechanical properties of rock formation, and the macro failure is usually closely related to the change of micro mechanical properties and microstructure evolution. In this study, three-point bending test, nanoindentation test and SEM test were used to explore the macro and micro mechanical strength change characteristics and surface morphology evolution process of coal samples from abandoned mine water. The results showed that: (1) both the macro and micro mechanical properties of coal obviously deteriorated. In terms of micro mechanical properties, the hardness and modulus decreased with the treatment time increased, while the indentation depth shows the opposite trend. (2) The overall structure of coal body presents softening phenomenon. In addition to the change of micromechanical properties mentioned in conclusion (1), the fracture velocity of samples also decreased significantly, with a decrease of three orders of magnitude (3.8–0.007 m/s). In addition, with the increase of treatment time, some samples have obvious tensile strain concentration zone at 50 % P_max. (3) Under abandoned mine water environment, both treatment time and ambient temperature affect the mechanical properties of the specimen. In general, the treatment time is the main contributing factor, the Ambient temperature significantly influences the deterioration of Mode I fracture toughness of the specimen during the early stage of reaction, and an increase in temperature produces a more pronounced softening effect on the specimen.

废弃矿山破碎带在张拉作用下易发生i型破坏。具有腐蚀性的矿井废弃水会侵蚀岩体，加速拉破坏过程，影响地下空间的稳定性和开发效率。前人研究表明，矿山水岩长期接触对岩体宏观力学特性有明显影响，宏观破坏通常与细观力学特性的变化和微观结构演化密切相关。本研究通过三点弯曲试验、纳米压痕试验和扫描电镜试验，探讨了废弃矿井水煤样的宏微观力学强度变化特征和表面形貌演化过程。结果表明：(1)煤的宏观力学性能和微观力学性能均明显恶化。显微力学性能方面，硬度和模量随处理时间的增加而降低，压痕深度则相反。(2)煤体整体结构呈现软化现象。除了结论(1)中所述的微观力学性能变化外，试样的断裂速度也显著降低，降低了3个数量级（3.8 ~ 0.007 m/s）。另外，随着处理时间的增加，部分试样在50% Pmax处出现了明显的拉伸应变集中区。(3)废弃矿井水环境下，处理时间和环境温度对试样力学性能均有影响。总的来说，处理时间是主要影响因素，环境温度对反应初期试样I型断裂韧性的劣化有显著影响，温度的升高对试样的软化作用更为明显。

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引用次数: 0

From experiment to simulation: probing the crack propagation mechanisms of S-shaped fissures in rock-like specimens via sand 3D printing and DEM modelling 从实验到模拟：通过砂体3D打印和DEM建模，探索类岩石试件s形裂缝的裂纹扩展机制

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics

Pub Date : 2025-12-16 DOI: 10.1016/j.tafmec.2025.105401

Zhenyu Zhu , Shuyang Yu , Yifei Li , Runyu Liu

S-shaped fissures are prevalent in folded rock strata yet remain understudied. This study investigates their fracture mechanics using sand 3D printing and PFC2D simulations, overcoming natural sample heterogeneity. Sand 3D printing technology was used to fabricate rock-like specimens with S-shaped fissures of varying short semi-axis lengths b and dip angles α, with straight fissure specimens as the control group. Uniaxial compression tests combined with DIC technology were conducted to analyze surface strain fields and crack propagation, while PFC2D (DEM) was employed for numerical simulations. Results show five crack types. The specimen strength exhibits a non-monotonic dependence on short semi-axis length b and fissure dip angle α, reaching its maximum at b = 5 mm and α = 60°. Tensile cracks dominate all specimens, with their proportion changing consistently with strength for varying b. Crack initiation is driven by tensile stress concentration, which shifts from fissure tips to arch tips as b and α increase. This study provides critical insights for the stability assessment of rock engineering with complex S-shaped fissures.

s型裂缝在褶皱岩层中普遍存在，但仍未得到充分研究。该研究利用砂岩3D打印和PFC2D模拟来研究其破裂力学，克服了天然样品的非均质性。采用砂体3D打印技术制备具有不同短半轴长度b和倾角α的s型裂隙的类岩石试样，并以直裂隙试样为对照组。采用单轴压缩试验结合DIC技术分析表面应变场和裂纹扩展，采用PFC2D （DEM）进行数值模拟。结果表明，裂纹有5种类型。试样强度与短半轴长度b和裂隙倾角α呈非单调关系，在b = 5 mm和α = 60°时达到最大值。拉伸裂纹在所有试样中占主导地位，在b和α变化时，拉伸裂纹的比例随强度的变化而变化。拉伸应力集中驱动裂纹萌生，随着b和α的增大，拉伸应力集中从裂纹尖端向拱尖转移。该研究为复杂s型裂隙岩石工程的稳定性评价提供了重要见解。

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引用次数: 0

Calculation of plastic notch stress intensity factor and strain energy density by Peak Stress Method under low-cycle fatigue conditions 用峰值应力法计算低周疲劳条件下塑性缺口应力强度因子和应变能密度

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics

Pub Date : 2025-12-16 DOI: 10.1016/j.tafmec.2025.105396

Domen Šeruga , Alberto Campagnolo , Jernej Klemenc , Giovanni Meneghetti

In this article, an idea for prediction of low-cycle fatigue durability of notched components is presented. The concept implements the Peak Stress Method into the calculation of both the plastic notch stress intensity factor and averaged elasto-plastic strain energy density. The scatter reduction which is characteristic for the approach using the strain energy density calculation under high-cycle fatigue conditions is less pronounced in the low-cycle fatigue area. Importantly, the otherwise changed slope of the durability curve in the low-cycle fatigue regime of the material remains almost equal to the slope in the high-cycle fatigue regime of the material using the implemented method. The method has been validated on tension–compression testing of plain and V-notched specimens of structural steel St-52 with three notch angles: 35

^{o}

, 90

^{o}

and 135

^{o}

. It is shown that significant agreement can be drawn between predictions using the Peak Stress Method and finite element evaluation of the averaged strain energy density.

本文提出了缺口构件低周疲劳耐久性预测的思路。该概念将峰值应力法引入到塑性缺口应力强度因子和平均弹塑性应变能密度的计算中。在高周疲劳条件下采用应变能密度计算方法所具有的散射消减特征在低周疲劳区不太明显。重要的是，使用该方法后，材料在低周疲劳状态下的耐久性曲线斜率与材料在高周疲劳状态下的斜率几乎相等。该方法在St-52结构钢的平面和v形缺口试件的拉压试验中得到了验证，缺口角分别为35o、90o和1350。结果表明，峰值应力法的预测结果与平均应变能密度的有限元计算结果具有显著的一致性。

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引用次数: 0

J-integral-based evaluation of elasto-plastic fracture toughness of Al/PTFE reactive materials under low strain rates 基于j积分的低应变率下Al/PTFE反应材料弹塑性断裂韧性评价

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics

Pub Date : 2025-12-16 DOI: 10.1016/j.tafmec.2025.105409

Xinxin Ren , Jinchun Liu , Yuchun Li , Jiaxiang Wu , Bin Feng , Junyi Huang , Huaixi Wang , Ruiqi Wang

The non-linear elastic–plastic strain energy fracture toughness of the aluminum/polytetrafluoroethylene (Al/PTFE) reactive material is correlated to some extent with the hot spot reaction mechanism and the material has a significant strain rate effect. In order to investigate the effect of strain rate on the J-integral-based fracture toughness, this study employed a universal testing machine to carry out static tensile tests and J-integral-based elastic-plastic fracture toughness tests in accordance with ASTM E1820. Crack extension length and strain rate calculations were tested using Digital Image Correlation (DIC) technique. A J-integral analysis is conducted to evaluate the elastic-plastic fracture toughness of Al/PTFE using the normalized data reduction technique in accordance with the ASTM E1820 single-specimen method. Finally, scanning electron microscopy (SEM) was employed to observe the fracture morphology and analyze the influence of strain rate on microscale fracture behavior. The results show that the critical value of the J-integral (J_Ic) of Al/PTFE reactive materials exhibits an obvious strain rate effect. The critical J-integral values (J_Ic) of the four ASTM-valid data points increase logarithmically with the increase of strain rate: J_Ic

= 19.95 + 3.83 \lg \dot{ε}

. At 10 mm·s⁻¹, the specimen exhibits unstable crack growth exceeding ASTM validity limits, transitioning to brittle fracture with a “pop-in” behavior. Microscopic observations reveal that increasing strain rate suppresses viscoelastic relaxation and fiber formation in the PTFE matrix, thereby altering the crack-propagation mode. The strain rate-dependent J_Ic relationship provides a quantitative basis for assessing strain-rate-dependent fracture resistance in Al/PTFE reactive materials, which is conducive to the safer and more reliable engineering application of reactive composites.

铝/聚四氟乙烯（Al/PTFE）反应材料的非线性弹塑性应变能断裂韧性与热点反应机理有一定的相关性，材料具有显著的应变率效应。为了研究应变速率对j -积分断裂韧性的影响，本研究采用万能试验机，按照ASTM E1820标准进行静态拉伸试验和j -积分弹塑性断裂韧性试验。采用数字图像相关（DIC）技术对裂纹扩展长度和应变率计算结果进行了验证。根据ASTM E1820单试样法，采用归一化数据约简技术对Al/PTFE的弹塑性断裂韧性进行了j积分分析。最后，利用扫描电镜（SEM）观察断口形貌，分析应变速率对微尺度断裂行为的影响。结果表明：Al/PTFE反应材料的j积分（JIc）临界值表现出明显的应变速率效应；4个astm有效数据点的临界j积分值（JIc）随应变速率的增加呈对数增长：JIc=19.95+3.83 ε˙。在10 mm·s−1时，试样表现出不稳定的裂纹扩展，超出了ASTM的有效限制，过渡到具有“弹出”行为的脆性断裂。微观观察表明，应变速率的增加抑制了PTFE基体的粘弹性松弛和纤维的形成，从而改变了裂纹的扩展模式。应变率相关JIc关系为评价Al/PTFE反应材料应变率相关断裂性能提供了定量依据，有利于反应复合材料更安全、更可靠的工程应用。

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引用次数: 0

Nonlinear analysis of planar cracks in 2D piezoelectric semiconductors with energetically consistent crack-face boundary conditions 具有能量一致裂纹面边界条件的二维压电半导体平面裂纹非线性分析

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics

Pub Date : 2025-12-16 DOI: 10.1016/j.tafmec.2025.105403

Wenjie Feng , Wangdong Shi

In this study, the plane fracture behavior of 2D piezoelectric semiconductor materials under coupled electromechanical-carrier fields is investigated. Based on the principle of minimum electric enthalpy, energetically consistent crack-face boundary conditions are clearly provided for both linear dielectric crack gap and nonlinear electrically discharging crack gap models. Compared with the ‘exact’ electric boundary conditions, the proposed crack-face conditions ensure consistent energy release rates between the one at the crack-tip and the one in the system-level, thereby offering improved theoretical applicability. Furthermore, the effects of the applied far-field stress, electric displacement, and current density on energy release rates are analyzed in detail, and the regulatory role of the critical breakdown field in a nonlinear discharge crack model is also examined. Some important conclusions are drawn and these should be helpful for the design of the piezoelectric semiconductor structures or devices.

本文研究了二维压电半导体材料在机电-载流子耦合场作用下的平面断裂行为。基于最小电焓原理，明确给出了线性介质裂纹间隙模型和非线性放电裂纹间隙模型的能量一致裂纹面边界条件。与“精确的”电边界条件相比，所提出的裂纹面条件确保了裂纹尖端和系统级能量释放率的一致，从而提高了理论适用性。此外，还详细分析了外加远场应力、电位移和电流密度对能量释放率的影响，并考察了临界击穿场在非线性放电裂纹模型中的调节作用。得到了一些重要的结论，这些结论对压电半导体结构或器件的设计有一定的指导意义。

引用次数: 0

Dynamic fracture behavior of 3D-printed composites reinforced with continuous fibers 连续纤维增强3d打印复合材料的动态断裂行为

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics

Pub Date : 2025-12-15 DOI: 10.1016/j.tafmec.2025.105405

Mohammad Reza Khosravani , Sankalp Patil , Payam Soltani , Georg Ganzenmüller , Stefan Hiermaier , Tamara Reinicke

This study aims to analyze the influence of continuous fiber reinforcement on the dynamic behavior of 3D-printed composites. To this end, semicircular bending (SCB) test coupons were designed and printed using the fused filament fabrication (FFF) technique. Particularly, nylon material was used as a matrix in all specimens, while fiberglass was utilized as the reinforced material. Since printing orientation has a significant influence on the mechanical behavior of 3D-printed components, the samples were printed in different directions. In a series of tests, the SCB specimens were impacted using a split Hopkinson pressure bar (SHPB) with a strain rate of 100 s⁻¹. In this research, a high-speed photograph system was used with a focus on the SCB specimens to capture their deformation behaviors. The results of dynamic three-point bending tests indicate that the maximum force increased by 190.2% and 238.1% in the specimens printed in ZY and YZ orientations, respectively, as a result of fiber reinforcing. The documented outcomes can be used for the design and production of 3D-printed composites with enhanced structural performance and customized mechanical strength.

本研究旨在分析连续纤维增强对3d打印复合材料动态性能的影响。为此，采用熔丝制造（FFF）技术设计并打印了半圆弯曲（SCB）测试片。其中，所有试件均采用尼龙材料作为基体，玻璃纤维作为增强材料。由于打印方向对3d打印部件的力学行为有显著影响，因此将样品沿不同方向打印。在一系列试验中，采用应变速率为100 s−1的分离式霍普金森压杆（SHPB）对SCB试样进行冲击。在本研究中，采用高速摄影系统，聚焦于SCB试样，捕捉其变形行为。动态三点弯曲试验结果表明，在ZY方向和YZ方向上进行纤维增强后，试样的最大受力分别提高了190.2%和238.1%。记录的结果可用于设计和生产具有增强结构性能和定制机械强度的3d打印复合材料。

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引用次数: 0

Fatigue performance and fracture-based modeling of LPBF CuCrZr with process-induced defects 含工艺缺陷的LPBF CuCrZr疲劳性能及基于断裂的建模

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics

Pub Date : 2025-12-14 DOI: 10.1016/j.tafmec.2025.105399

L. Salvò , L. Festi , A. Pepato , P. Rebesan , M. Bonesso , D. Razvan , M. Perini , P. Gregori , M. Pellizzari , M. Benedetti

This study investigates the fatigue performance of laser powder bed fused (LPBF) CuCrZr alloy intentionally processed under non-optimized conditions to introduce lack-of-fusion (LOF) defects and coarse precipitates, enabling the development of defect-sensitive fatigue models. Specimens were produced with high LOF porosity and subjected to heat treatment to reproduce industrial-scale constraints. Tensile and fatigue tests, conducted on both smooth and notched specimens, revealed LOF pores, in subsurface or in touch with surface position, as the dominant crack initiation sites. A comprehensive characterization of pore size and distribution enabled the construction of a defect-inclusive Kitagawa–Takahashi diagram using the Benedetti–Santus semi-analytical approach, eliminating the need for costly fatigue crack growth threshold experiments. Five defect-tolerant fatigue prediction methods were benchmarked: Murakami's √area model, the extended Kitagawa–Takahashi framework, the Theory of Critical Distances (TCD), the Averaged Strain Energy Density (ASED) method, and the Bayesian Fatigue Analysis with Defects (B-FADE). The Benedetti KT model and B-FADE yielded accurate, experimentally validated fatigue thresholds, while TCD and ASED provided consistent defect-free fatigue limits and notch sensitivity indices (q ≈ 0.5). Murakami's model overestimated endurance limits due to its calibration on harder alloys. These findings emphasize the need for alloy-specific modeling strategies and demonstrate that accurate fatigue-life predictions for LPBF CuCrZr are achievable, even in the presence of severe processing-induced defects. This work supports the development of robust, defect-tolerant design approaches for high-performance AM copper components in aerospace, nuclear, and electronics applications.

本研究研究了激光粉末床熔合（LPBF） CuCrZr合金在非优化条件下有意加工的疲劳性能，以引入缺乏熔合（LOF）缺陷和粗沉淀，从而开发缺陷敏感疲劳模型。样品制作具有高LOF孔隙率，并经过热处理以再现工业规模的限制。在光滑和缺口试样上进行的拉伸和疲劳试验表明，在表面下或与表面接触的LOF孔是主要的裂纹起裂部位。通过对孔隙大小和分布的全面表征，可以使用Benedetti-Santus半解析方法构建包含缺陷的Kitagawa-Takahashi图，从而消除了昂贵的疲劳裂纹扩展阈值实验的需要。对村上面积模型、扩展Kitagawa-Takahashi框架、临界距离理论（TCD）、平均应变能密度法（ASED）和带缺陷的贝叶斯疲劳分析（B-FADE）五种容缺陷疲劳预测方法进行了基准测试。Benedetti KT模型和B-FADE模型得到了准确的、经过实验验证的疲劳阈值，而TCD和ASED模型提供了一致的无缺陷疲劳极限和缺口灵敏度指数（q≈0.5）。村上的模型高估了耐久性极限，因为它是在较硬的合金上进行校准的。这些发现强调了对特定合金建模策略的需求，并表明即使存在严重的加工缺陷，LPBF CuCrZr的准确疲劳寿命预测也是可以实现的。这项工作支持了航空航天、核和电子应用中高性能增材制造铜组件的稳健、容错设计方法的开发。

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引用次数: 0

Experimental study on the crack propagation characteristic of coal specimens with offset cracks and the I-II mixed SIF variation by using ultrafast time-resolution method 基于超快时间分辨方法的煤样偏置裂纹扩展特性及I-II混合SIF变化试验研究

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics

Pub Date : 2025-12-14 DOI: 10.1016/j.tafmec.2025.105398

Mingyuan Zhang , Muao Shen , Shankun Zhao , Dejian Li , Yingjun Li

In coal mining, mixed-mode I-II fractures caused by offset cracks are commonly observed. While previous research has primarily focused on stress intensity factors (SIFs) at the crack tip during fracture initiation, the variation of SIFs during crack propagation has received limited attention. As the SIF is a singular parameter, the precise localization of the crack tip is critical for its determination. However, traditional high-speed photography and visual localization methods often introduce systematic errors in experimental measurements. Therefore, this study employs an ultrafast time-resolution method (15 ps) based on pulsed laser technology combined with an immune algorithm to eliminate such errors and calculate I-II mixed-mode SIFs. Semi-circular bend (SCB) experiments were conducted on coal specimens with offset fractures positioned at 5 mm, 10 mm, and 15 mm from the center. Experimental results demonstrate that both Mode I and Mode II SIFs at crack initiation increase with greater offset distances. Notably, a significant decrease in SIFs is observed after the onset of crack propagation. Additionally, the energy release rates at initiation were measured as 140.77 J/m², 328.45 J/m², and 2063.61 J/m², showing a clear upward trend with increasing offset distance. This paper presents a novel experimental approach for characterizing the coal fracture process and SIF evolution, providing valuable insights for laboratory testing in rock mechanics.

在煤矿开采中，常观察到由偏置裂缝引起的I-II型混合模式裂缝。以往的研究主要集中在裂纹尖端的应力强度因子（SIFs）上，而对裂纹扩展过程中SIFs的变化关注较少。由于SIF是一个奇异参数，裂纹尖端的精确定位是确定SIF的关键。然而，传统的高速摄影和视觉定位方法往往会在实验测量中引入系统误差。因此，本研究采用基于脉冲激光技术的超快时间分辨率方法（15ps）结合免疫算法消除此类误差，计算I-II混合模SIFs。在离中心5 mm、10 mm和15 mm的偏置裂缝处对煤样进行了半圆弯曲试验。实验结果表明，裂纹起裂时的I型和II型SIFs均随偏移距离增大而增大。值得注意的是，在裂纹扩展开始后，观察到SIFs显著降低。初始能量释放速率分别为140.77 J/m2、328.45 J/m2和2063.61 J/m2，随着偏移距离的增加，能量释放速率呈明显上升趋势。本文提出了一种新的实验方法来表征煤的破裂过程和SIF演化，为岩石力学的实验室测试提供了有价值的见解。

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引用次数: 0