Engineering Fracture Mechanics最新文献_第7页

Scaling effect of concrete gravity dam subjected to underwater explosion in the field test 水下爆炸作用下混凝土重力坝的结垢效应

IF 5.3 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-12-26 DOI: 10.1016/j.engfracmech.2025.111825

Z.Q. Chen , Y.H. Cheng , H. Wu

The conventional field reduced-scale test is a primary method for examining the blast resistance of concrete gravity dam against underwater explosion, while the inherent scaling effect prevents the extrapolation of reduced-scale test results to predict the dynamic behaviors of prototype dam. At present, a series of numerical simulations is carried out to clarify the underlying causes of scaling effect and establish a similarity relationship for concrete gravity dam against underwater explosion in the field test. Firstly, the critical influential factors of scaling effect were clarified based on the dimensional analysis, including the gravitational effect, strain rate effect and material size effect. The dimensionless horizontal displacement of dam was found to be dependent on the dimensionless damage number and gravitational characteristic number. Secondly, a finite element analysis approach incorporating the aforementioned influential factors was developed and comprehensively verified from both macroscopic and mesoscopic aspects. Subsequently, based on a 120 m-high prototype gravity dam, eight scenarios with the scaling factors ranging from 1/50 to 1 were designed and analyzed from the perspectives of both explosion loading and structural behaviors. Furthermore, the contributions of three influential factors to the scaling effect were examined. It indicates that the contribution of the strain rate effect is particularly significant in the small-scale model and sensitive to the intensity of blast wave, while the gravitational effect plays a dominant role in the large-scale model. Additionally, the influence of concrete size effect is comparable at different scales and relatively limited. Finally, the similarity relationships of horizontal dam displacement in the field test, involving the normalized displacement, displacement increase factor and the dimensionless displacement, were established, which address the limitations imposed by the scaling effect on the extrapolation of displacement data acquired from the reduced-scale test and provide a valuable reference for evaluating the blast resistance of prototype dam.

常规的现场小比例尺试验是检验混凝土重力坝水下爆炸抗震性的主要方法，但其固有的尺度效应阻碍了通过小比例尺试验结果外推预测原型坝动力特性。目前，通过一系列数值模拟，阐明了混凝土重力坝抗水下爆炸的结垢效应的深层原因，并建立了现场试验中混凝土重力坝抗水下爆炸的相似关系。首先，在量纲分析的基础上，明确了影响结垢效应的关键因素，包括重力效应、应变率效应和材料尺寸效应；发现大坝的无因次水平位移与无因次损伤数和重力特征数有关。其次，建立了考虑上述影响因素的有限元分析方法，并从宏观和细观两个方面进行了全面验证。随后，以120 m高的重力坝原型为基础，从爆炸荷载和结构性能两方面设计并分析了尺度因子为1/50 ~ 1的8种场景。进一步分析了三个影响因素对标度效应的贡献。结果表明，应变率效应在小尺度模型中贡献尤为显著，且对爆炸波强度敏感，而重力效应在大尺度模型中起主导作用。此外，混凝土尺寸效应的影响在不同尺度下具有可比性，且相对有限。最后，建立了归一化位移、位移增加因子和无因次位移在现场试验中的相似关系，解决了尺度效应对缩小试验位移数据外推的限制，为评价原型坝的抗爆破能力提供了有价值的参考。

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引用次数: 0

Towards a new methodology to characterize the fracture energies of the woven composite/copper interface in mode I and mode II: Application to printed circuit boards 一种表征I型和II型编织复合材料/铜界面断裂能的新方法：在印刷电路板上的应用

IF 5.3 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-12-26 DOI: 10.1016/j.engfracmech.2025.111819

Charaf-Eddine Ziouani , Gautier Girard , Sébastien Mercier , François Lechleiter

The continuous trend towards miniaturization in electronic devices has stimulated the development of a new generation of printed circuit boards (PCBs) with embedded components. Throughout their lifespan, PCBs are subjected to thermal loads generated by heat from active components or the surrounding environment. In particular, mismatches in thermal expansion coefficients between materials are a leading cause of thermal stresses, often resulting in layer delamination, either between insulating substrates or at the copper-substrate interface. Traditionally, the peel test has been the dominant method for evaluating interfacial energy within PCBs, offering an estimate of the interface energy based on the IPC standard. During peeling, the copper layer often undergoes significant plastic deformation, complicating the precise determination of the fracture energy. Thus, achieving an accurate assessment of the mechanical response at the interface remains a challenging task. To overcome these limitations, we have designed a new specimen and adapted the Double Cantilever Beam (DCB) and End Notched Flexure (ENF) tests to the PCB context where layer thickness is significantly constrained (with copper layers ranging from 17 to

70 μ m

). Prior to experimentation, simulations demonstrate that, unlike the peel test, the DCB and ENF configurations exhibit minimal plastic dissipation. One of the main outcomes of the work is that a precise description of the plastic behavior of copper is not necessary to determine accurate estimations of the critical strain energy release rates in mode I and mode II. Furthermore, a notable advantage of these methods is their ability to maintain a controlled fracture mode, whereas the peel test inherently involves a mixed-mode (I and II) fracture process. The synergy between finite element analysis and experimental testing provides critical insights about the framework of application of the methods.

电子器件小型化的持续趋势刺激了新一代嵌入式元件印刷电路板（pcb）的发展。在其整个使用寿命中，pcb都受到来自有效元件或周围环境的热量产生的热负荷的影响。特别是，材料之间热膨胀系数的不匹配是热应力的主要原因，通常导致绝缘衬底之间或铜衬底界面处的层脱层。传统上，剥离测试一直是评估pcb内部界面能的主要方法，提供基于IPC标准的界面能估计。在剥离过程中，铜层经常发生显著的塑性变形，使断裂能的精确测定变得复杂。因此，实现在界面上的机械响应的准确评估仍然是一个具有挑战性的任务。为了克服这些限制，我们设计了一种新的试样，并将双悬臂梁（DCB）和端缺口弯曲（ENF）测试适应于层厚度明显受限的PCB环境（铜层范围从17到70μm）。在实验之前，模拟表明，与剥离试验不同，DCB和ENF结构表现出最小的塑性耗散。这项工作的主要结果之一是，铜的塑性行为的精确描述是没有必要的，以确定准确的估计临界应变能释放率在I型和II型。此外，这些方法的一个显著优势是它们能够保持可控的断裂模式，而剥离试验本质上涉及混合模式（I和II）断裂过程。有限元分析和实验测试之间的协同作用为方法的应用框架提供了关键的见解。

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引用次数: 0

A new method of determining rock shear (or true mode II) fracture toughness 一种确定岩石剪切（或真II型）断裂韧性的新方法

IF 5.3 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-12-26 DOI: 10.1016/j.engfracmech.2025.111828

Kun Zheng , Linjian Ma , Wen Hua

Fracture toughness remains a significant research topic in solid fracture mechanics, representing the material resistance to crack propagation. The shear fracture often occurs in rock masses, especially for mines, slopes, and faults. To determine the rock shear (or true mode-II) fracture toughness, this paper develops a new fracture test method based on the Mohr-Coulomb criterion. The new method comprises a double-edge notched rectangular column (DNRC) specimen, which is substantiated by the experimental data obtained from various mode-II test methods. The designed DNRC specimens exhibit a self-planar crack propagation pattern, which conforms to the shear fracture definition. The average shear fracture toughness K_IIc of DNRC sandstone specimens is 2.81 MPa•m^0.5, and the average tensile fracture toughness K_Ic of ENDB (edge-notched disk bend) sandstone specimens is 1.03 MPa•m^0.5. The ratio of K_IIc to K_Ic is 2.73, which is consistent with published experimental results obtained from the established mode-II test methods. The Mohr-Coulomb criterion provides theoretical explanations for the newly designed DNRC specimen, and the current and previous experimental results further validate its effectiveness and reliability. This paper aims to develop a test method which can realize both mode II loading and true mode II fracturing, thereby exploring the shear fracture behaviors of brittle and quasi-brittle materials.

断裂韧性是固体断裂力学中一个重要的研究课题，它代表了材料对裂纹扩展的阻力。剪切断裂常发生在岩体中，特别是矿山、边坡和断层。为了确定岩石的剪切（或真ii型）断裂韧性，本文提出了一种基于Mohr-Coulomb准则的断裂试验方法。该方法采用双边缘缺口矩形柱（DNRC）试件，并通过各种ii型试验方法获得的实验数据进行验证。设计的DNRC试件呈现自平面裂纹扩展模式，符合剪切断裂定义。DNRC砂岩试件的平均剪切断裂韧性KIIc为2.81 MPa•m0.5， ENDB（边缘切口圆盘弯曲）砂岩试件的平均拉伸断裂韧性KIc为1.03 MPa•m0.5。KIIc与KIc之比为2.73，与已发表的用已建立的ii型试验方法得到的实验结果一致。Mohr-Coulomb准则为新设计的DNRC试件提供了理论解释，目前和以往的试验结果进一步验证了该准则的有效性和可靠性。本文旨在开发一种既能实现II型加载又能实现真II型断裂的试验方法，从而探索脆性和准脆性材料的剪切断裂行为。

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引用次数: 0

A fracture mechanics-based three‑dimensional strength criterion for hard rocks 基于断裂力学的硬岩三维强度准则

IF 5.3 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-12-26 DOI: 10.1016/j.engfracmech.2025.111824

Junwei Chen , Zhi Zhao

Rock masses in engineering often experience anisotropic stress fields. To ensure the long-term integrity of rock masses, it is crucial to establish accurate three-dimensional strength criteria for analyzing and predicting the deformation and displacement of surrounding rocks. This paper extends the classical mixed-mode fracture criterion to cracks under compressive stress by incorporating the effects of friction on crack surfaces, thereby establishing a three-dimensional strength criterion. The study focuses on stress-induced initiation and subsequent propagation of pre-existing penny-shaped cracks, which form a fan-shaped damage zone. To avoid explicit modeling of the complex physics mechanism of crack propagation, this damage zone is correlated with acoustic emission experiments, bridging micro- and macro-scale strength behavior of rock samples and ultimately proposing a novel 3D strength criterion for hard rocks. The results indicate that the proposed strength criterion reliably predicts triaxial strength across a range of rock types, with strong agreement with experimental data. Furthermore, when the intermediate principal stress equals the minimum principal stress, this criterion naturally reduces to the classical Hoek-Brown strength criterion. Therefore, the proposed criterion is robust for analyzing and predicting rock strength under three-dimensional stress conditions.

工程中岩体经常经历各向异性应力场。为了保证岩体的长期完整，建立准确的三维强度准则是分析和预测围岩变形和位移的关键。本文将经典的混合模式断裂准则扩展到压应力作用下的裂纹，纳入裂纹表面摩擦的影响，从而建立了三维强度准则。研究的重点是应力诱发的预先存在的便士形裂纹的启动和随后的扩展，形成一个扇形的损伤区。为了避免对裂纹扩展的复杂物理机制进行显式建模，将该损伤区域与声发射实验相关联，连接岩石样品的微观和宏观强度行为，最终提出一种新的硬岩石三维强度准则。结果表明，所提出的强度准则可靠地预测了一系列岩石类型的三轴强度，与实验数据非常吻合。当中间主应力等于最小主应力时，该准则可归结为经典的Hoek-Brown强度准则。因此，该准则对于三维应力条件下岩石强度的分析和预测具有较强的鲁棒性。

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引用次数: 0

A three-dimensional adaptive non-uniform discretization for the non-local method in solid fracture 固体断裂非局部方法的三维自适应非均匀离散化

IF 5.3 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-12-26 DOI: 10.1016/j.engfracmech.2025.111823

Xiao-Ping Zhou, Er-Bao Du

In this paper, a three-dimensional adaptive non-uniform discretization for the non-local method (TANDNM) is established to simulate crack propagation behaviors, in which the stochastic idea of Monte-Carlo method is developed to calculate the volume of material points, and the Vectorization and Logical Operators (VLO) are proposed to obviously improve the computational efficiency. The proposed method can successfully realize the adaptive non-uniform discretization of material points without knowing the crack path in advance. Moreover, a positioning method based on polygon edge-by-edge traversal for new material point interpolation in Delaunay triangular mesh is proposed, which overcomes the shortcomings of the Ray-Casting Algorithm. Several numerical cases are illustrated to verify the computational results of the proposed method. The results obtained by the proposed method are in good agreement with those obtained by the traditional peridynamics and other methods.

本文建立了一种模拟裂纹扩展行为的非局部自适应非均匀离散化方法（TANDNM），其中发展了蒙特卡罗方法的随机思想来计算材料点的体积，并提出了矢量化和逻辑算子（VLO），明显提高了计算效率。该方法可以在不事先知道裂纹路径的情况下，成功地实现材料点的自适应非均匀离散化。此外，提出了一种基于多边形逐边遍历的Delaunay三角形网格新材质点插值定位方法，克服了光线投射算法的不足。算例验证了所提方法的计算结果。该方法的计算结果与传统的周动力学和其他方法的计算结果吻合较好。

引用次数: 0

Information mining-assisted fatigue life prediction of aluminum alloys 信息挖掘辅助铝合金疲劳寿命预测

IF 5.3 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-12-20 DOI: 10.1016/j.engfracmech.2025.111801

Lu Xiao , Jingli Ren

We propose an information mining-assisted machine learning framework to predict the fatigue life of aluminum alloys. This framework aims to improve model’s performance by integrating mined information into modeling process. Specifically, it employs genetic programming-based symbolic regression (SR) to mine underlying information, which describes a relationship between key material parameters (stress amplitude, maximum stress, ultimate tensile strength) and fatigue life. The mined relationship is then integrated into modeling for fatigue life prediction. Experimental datasets of various aluminum alloys, multi-principal element alloys, and steels are utilized to evaluate the proposed framework. The results demonstrate that the SR-assisted models achieve superior accuracy and generalization (R

^{2}

>

0.8) to the black-box models (R

^{2}

<

0.8). Moreover, interpretability analysis revealed that high concentrations of Mg, Zn, Zr, Cr, Mn, and Cu are beneficial to the fatigue strength of aluminum alloys. The proposed framework provides a more general and accurate approach for fatigue life prediction than conventional methods, thereby offering more reliable support for the risk assessment of structural components.

提出了一种基于信息挖掘的机器学习框架来预测铝合金的疲劳寿命。该框架旨在通过将挖掘的信息集成到建模过程中来提高模型的性能。具体来说，它采用基于遗传规划的符号回归（SR）来挖掘潜在信息，这些信息描述了关键材料参数（应力振幅、最大应力、极限抗拉强度）与疲劳寿命之间的关系。然后将挖掘的关系集成到疲劳寿命预测的建模中。利用各种铝合金、多主元素合金和钢的实验数据集来评估所提出的框架。结果表明，sr辅助模型的精度和泛化程度（R2 > 0.8）优于黑盒模型（R2 < 0.8）。此外，可解释性分析表明，高浓度的Mg、Zn、Zr、Cr、Mn和Cu有利于铝合金的疲劳强度。该框架为疲劳寿命预测提供了一种比传统方法更通用、更准确的方法，从而为结构构件的风险评估提供了更可靠的支持。

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引用次数: 0

Failure nano-interface evolution mechanisms in natural mineralized materials – Mineral aggregation-mediated multiscale toughening effects 天然矿化材料中破坏纳米界面演化机制。矿物聚集介导的多尺度增韧效应

IF 5.3 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-12-20 DOI: 10.1016/j.engfracmech.2025.111817

Tianbao Qian , Yao Cheng , Shuang Sun , Longyan Zhao , Qingyu Liu , Zuquan Hu , Chuan Ye , Zhu Zeng

Natural mineralized biomaterials are renowned for exceptional mechanical properties, primarily attributed to their hierarchical structures. However, the mechanisms underlying the toughening of hierarchical inorganic mineral nanostructures during macroscopic deformation remain insufficiently understood and warrant further investigation. In this study, we utilized an in situ atomic force microscopy (AFM)-mechanical testing platform to scrutinize the deformation behaviors of inorganic mineral nanostructures in nacre and bone during the initiation of crack. Our results reveal that, when subjected to external forces, both nacre and bone predominantly undergo deformation of the mineral phase through the formation and reorganization of mineral aggregates. Specifically, in nacre, aragonite nano-granular aggregates are reorganized into clusters of beaded grains, while in bone, hydroxyapatite mineral aggregates interact synergistically with collagen fibrils, thereby modulating submicron crack orientations and increasing the likelihood of crack deflection. The interfacial submicron cracks that develop between mineral aggregates significantly influence the path of crack propagation during external loading. This in situ investigation of nanoscale hierarchical mineral structures enhances our understanding of the inorganic phase’s role in degenerative bone pathologies, and the mechanical effect of mineral aggregates in regulating crack propagation in natural mineralized materials will provide critical insights for advancing biomimetic design in particle-reinforced composites.

天然矿化生物材料以其优异的机械性能而闻名，这主要归功于其分层结构。然而，层次无机矿物纳米结构在宏观变形过程中的增韧机制尚不清楚，值得进一步研究。在这项研究中，我们利用原位原子力显微镜(AFM)-力学测试平台来仔细研究珠光层和骨骼中无机矿物纳米结构在裂纹萌生过程中的变形行为。我们的研究结果表明，当受到外力时，珍珠层和骨骼主要通过矿物聚集体的形成和重组进行矿物相的变形。具体来说，在珍珠层中，文石纳米颗粒聚集体被重组成串珠状颗粒簇，而在骨骼中，羟基磷灰石矿物聚集体与胶原原纤维协同作用，从而调节亚微米裂纹方向，增加裂纹偏转的可能性。外加载过程中，矿物集料之间形成的界面亚微米裂纹对裂纹扩展路径有显著影响。纳米级分层矿物结构的原位研究增强了我们对无机相在退行性骨病变中的作用的理解，并且矿物聚集体在调节天然矿化材料中裂纹扩展方面的机械效应将为推进颗粒增强复合材料的仿生设计提供重要见解。

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引用次数: 0

An interface crack model of a bimaterial plane with consideration of the induced interfacial shear stress 考虑诱导界面剪应力的双材料界面裂纹模型

IF 5.3 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-12-19 DOI: 10.1016/j.engfracmech.2025.111816

F. Long , Z.L. Hu , X.Y. Zhang , X.F. Li

This paper presents a novel mode-I interface crack model by considering the presence of induced interfacial shear stress. By superposition, the original mode-I interface crack problem is transformed into a mixed boundary value problem. With the help of the Fourier integral transform method and dual integral equations, an analytic solution is obtained exactly. Explicit expressions for the full-field stresses and displacements, including asymptotic crack-tip fields and their angular distribution functions, of the bimaterial system with an interface crack are derived for a cracked bimaterial. The obtained results indicate that the oscillatory singularity does not occur and the inverse-square root singularity is exhibited. The fracture parameters such as the stress intensity factors (SIF) and the energy release rate (ERR) are derived in closed form and compared with the classical counterparts, thereby resolving the contradictions inherent in the classical mode-I interface crack model. We find that the mode-I SIF for an interfacially cracked bimaterial is independent of the material properties, but the ERR and the crack opening displacement at the crack center depend on the material properties of both dissimilar media. The influence of the material properties on the crack initiation angle is analyzed. An interface mode-I crack advances along the interface for a usual bimaterial, whereas the crack propagation path deviates from the original interface when Dundurs’ second parameter

(β)

exceeds 0.5, which occurs when one material is auxetic (with a negative Poisson’s ratio) and another is conventional material.

本文提出了一种考虑界面剪切应力诱导的i型界面裂纹模型。通过叠加，将原i型界面裂纹问题转化为混合边值问题。利用傅里叶积分变换法和对偶积分方程，精确地得到了解析解。导出了含界面裂纹的双材料系统的全场应力和位移的显式表达式，包括渐近裂纹尖端场及其角分布函数。结果表明，振动奇异性不存在，并表现出反平方根奇异性。以封闭形式导出应力强度因子（SIF）和能量释放率（ERR）等断裂参数，并与经典模型进行比较，从而解决了经典i型界面裂纹模型固有的矛盾。研究发现，界面裂纹双材料的i型SIF与材料性能无关，但ERR和裂纹中心的裂纹张开位移与两种不同介质的材料性能有关。分析了材料性能对裂纹起裂角的影响。普通双材料的界面i型裂纹沿界面扩展，而当Dundurs第二参数β超过0.5时，当一种材料为负泊松比时，另一种材料为常规材料，裂纹扩展路径偏离原界面。

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引用次数: 0

Calibration of triaxiality and Lode angle parameter-dependent failure models for high- and ultra-high-hardness steel based on experimental material characterization tests 基于实验材料表征试验的高、超高硬度钢三轴和Lode角参数相关失效模型标定

IF 5.3 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-12-19 DOI: 10.1016/j.engfracmech.2025.111788

Robbert Rietkerk, Andreas Heine, Werner Riedel

We explore the failure characteristics of high-hardness armor (HHA) and ultra-high-hardness (UHA) armor steel. We provide experimental data on the plasticity and ductility of two representative materials. A calibrated Johnson-Cook model effectively describes plasticity across multiple types of experiments. Based on this, we calibrate four different failure models, including triaxiality and Lode angle parameter-dependent variants. Among the failure models evaluated, the Chocron-Erice-Anderson model demonstrates the best performance, followed by Xue-Wierzbicki, Hosford-Coulomb, and Johnson-Cook. In comparing two parameter identification methods, we find that the combined experimental–numerical method that accounts for varying triaxiality and Lode angle parameter produces the most accurate models of material ductility.

研究了高硬度装甲（HHA）和超高硬度装甲钢的失效特征。我们提供了两种代表性材料的塑性和延性的实验数据。经过校准的Johnson-Cook模型有效地描述了多种实验类型的可塑性。在此基础上，我们校准了四种不同的失效模型，包括三轴性和Lode角参数相关的变量。在评估的失效模型中，Chocron-Erice-Anderson模型表现最佳，其次是Xue-Wierzbicki模型、Hosford-Coulomb模型和Johnson-Cook模型。通过对比两种参数识别方法，发现考虑三轴性和Lode角参数变化的试验-数值结合方法能得到最精确的材料延性模型。

引用次数: 0

Fatigue and fracture of self-reinforced polypropylene/polycarbonate composites at the presence of self-heating effect 自增强聚丙烯/聚碳酸酯复合材料在自热作用下的疲劳与断裂

IF 5.3 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics

Pub Date : 2025-12-18 DOI: 10.1016/j.engfracmech.2025.111815

Andrzej Katunin , Marcin Bilewicz , Dominik Wachla , Jafar Amraei , Tomasz Rogala , Roman Minikayev , Magdalena Osial

This study investigates the fatigue behavior and damage mechanisms of self-reinforced polypropylene/polycarbonate (PP/PC) composites manufactured using the shear-controlled orientation injection molding (SCORIM) technique. Microstructural characterization confirmed a layered morphology with PP as the matrix and PC dispersed as spherical inclusions, leading to anisotropic mechanical properties. Thermo-mechanical fatigue tests combined with the increasing amplitude tests established a fatigue strength of 19.4 MPa. Infrared thermography identified a critical self-heating temperature of ∼50 °C as the onset of macroscopic crack front formation, while final failure was associated with localized temperatures exceeding 110 °C due to frictional heating. Scanning electron microscope (SEM) revealed ductile fibrillation and crazing in the core, brittle fracture in outer layers, and interlayer delamination with pull-out mechanism. X-ray diffraction (XRD) showed preserved α-PP monoclinic structure with slight orientation loss after fatigue, while thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR) analysis confirmed thermal stability without chemical degradation. The results highlight the interplay of microstructure, anisotropy, and thermomechanical effects governing fatigue performance of SCORIM-processed PP/PC composites.

研究了采用剪切定向注射成型（SCORIM）技术制备的自增强聚丙烯/聚碳酸酯（PP/PC）复合材料的疲劳行为和损伤机理。微观结构表征证实其为以PP为基体，PC为球形夹杂体分散的层状形貌，导致其力学性能各向异性。热-机械疲劳试验结合增幅试验确定了其疲劳强度为19.4 MPa。红外热成像识别出临界自热温度为~ 50°C作为宏观裂纹前缘形成的开始，而由于摩擦加热，局部温度超过110°C与最终失效有关。扫描电镜（SEM）显示，芯部有韧性颤动和裂纹，外层有脆性断裂，层间有脱层和拉出机制。x射线衍射（XRD）结果显示，疲劳后α-PP单斜结构保留，取向有轻微损失，热重分析（TGA）和傅里叶红外光谱（FTIR）分析证实了α-PP的热稳定性，无化学降解。结果强调了微观结构、各向异性和热力学效应对scorim加工的PP/PC复合材料疲劳性能的相互作用。

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引用次数: 0