Engineering Fracture Mechanics最新文献

{"title":"Numerical and experimental investigation on rock breaking mechanism and performance of high-pressure energy-gathering water jet","authors":"Hongsheng Li ,&nbsp;Panpan Xu ,&nbsp;Lei Zhang ,&nbsp;Hongxiang Jiang ,&nbsp;Yueqiang Chen ,&nbsp;Dunkai Sun","doi":"10.1016/j.engfracmech.2025.111050","DOIUrl":"10.1016/j.engfracmech.2025.111050","url":null,"abstract":"<div><div>Addressing the issues of short target distance and small nozzle diameter in conventional jet rock breaking, which result in low rock breaking energy and difficulty in achieving efficient rock fragmentation, a high-pressure energy-gathering water jet (HEWJ) device is proposed. Firstly, the relationships between the radial, tangential and shear dynamic stresses of the rock and parameters such as “water hammer pressure” and the distance from the impact point of HEWJ were analyzed. By employing SPH-FEM algorithm, a “ball shaped” HEWJ rock breaking consistent with the theoretical model is established, revealing the stress variation patterns and crack propagation within the rock under the impact of HEWJ with different jet velocity, jet diameter, and surrounding rock stress. Finally, experimental studies were conducted to explore the time-effective characteristics, impact target distances and frequencies on the rock breaking performance. The results indicate that the HEWJ exhibits periodic changes. A single cycle mainly includes the energy storage stage and the impact stage, and the impact stage is very short, only 0.23 s. As the impact time lengthens, the rock breaking volume, the diameter and the depth of the crushing pit increase exponentially and finally tend to be stable. Regarding the impact target distance, the rock breaking volume and the diameter of the crushing pit initially increase but then decline, whereas the depth demonstrates a steadily decreasing tendency. When the flow rate of the hydraulic pump increases from 80 L/min to 140 L/min, the jet impact frequency increases from 0.1914 Hz to 0.3189 Hz and shows a linear growth. Moreover, the rock breaking volume, the diameter and the depth of the crushing pit all show an increasing trend with the growth of the impact frequency. The optimal impact frequency of the HEWJ on the rock is 0.3189 Hz, which indicates that the flow rate of the hydraulic pump is 140 L/min at this time.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111050"},"PeriodicalIF":4.7,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Atomistic/mesoscopic approach to the grains boundaries fracture: The case of UO2","authors":"Z.A. Manorosoa ,&nbsp;A. Chrysochoos ,&nbsp;A. Jelea ,&nbsp;Y. Monerie ,&nbsp;F. Perales","doi":"10.1016/j.engfracmech.2025.111029","DOIUrl":"10.1016/j.engfracmech.2025.111029","url":null,"abstract":"<div><div>In irradiated polycrystalline uranium dioxide (UO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>), the pressure generated at high temperature by the noble gases in the intergranular bubbles as well as the thermomechanical stresses due to temperature gradients cause the fracture of the grain boundaries. In this study, starting from an atomistic identification of the fracture energy, one analyzes through mesocopic calculations the behavior of grain boundaries under uniaxial tensile loading up to fracture. In these mesocopical simulations, a cohesive-volumetric approach using concepts of Frictional Cohesive Zone Models (FCZM) and numerical modeling methods based on Non-Smooth Contact Dynamics (NSCD) is employed to simulate grain boundary rupture with the presence of a void under uniaxial tensile loading. The associated computational code, called XPER (eXtended Finite Element method and PERiodic homogenization), allows the analysis of fracture at grain boundaries. A parametric study on the void size and shape is conducted. Voids with sharp edges promote stress concentration, facilitating rupture initiation. The observed trends regarding the variation in void size are similar to the Griffith model, and the results align with experimental findings.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111029"},"PeriodicalIF":4.7,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lattice modelling of complete acoustic emission waveforms in the concrete fracture process","authors":"Yubao Zhou ,&nbsp;Beyazit Bestami Aydin ,&nbsp;Fengqiao Zhang ,&nbsp;Max A.N. Hendriks ,&nbsp;Yuguang Yang","doi":"10.1016/j.engfracmech.2025.111040","DOIUrl":"10.1016/j.engfracmech.2025.111040","url":null,"abstract":"<div><div>The next generation of acoustic emission (AE) applications in concrete structural health monitoring (SHM) relies upon a reliable and quantitative relationship between AE measurements and corresponding AE sources. To achieve this, it is a prerequisite to accurately model the whole AE process that is a multiscale coupling process between local material fracturing and induced elastic wave propagation at structural level. Such a complex process, however, cannot be well addressed in currently available modelling methods. To fill this research gap, this study proposes a lattice modelling approach that achieves for the first time the explicit simulation of complete waveforms of transient AE signals induced by concrete fracture. The proposed approach incorporates an explicit time integration technique with a novel proportional-integral-derivative (PID) control algorithm for reducing spurious oscillations and a Rayleigh damping-based calculation and calibration method for the attenuation of AE waves. In this paper, the proposed lattice modelling approach is implemented to simulate the concrete Mode-I fracturing process in a three-point bending test. Besides the mechanical behaviors and AE hit number, a comparison was conducted between numerically and experimentally obtained AE waveforms. The AE waveforms and their attenuation characteristics simulated by the proposed lattice modelling method turn out to be comparable to experimental results. The proposed approach is of significance for a deep understanding of AE-related fracture mechanisms and a more reliable application of AE technique.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111040"},"PeriodicalIF":4.7,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A COMSOL framework for predicting hydrogen embrittlement, Part II: Phase field fracture","authors":"Andrés Díaz ,&nbsp;Jesús Manuel Alegre ,&nbsp;Isidoro Iván Cuesta ,&nbsp;Emilio Martínez-Pañeda","doi":"10.1016/j.engfracmech.2025.111008","DOIUrl":"10.1016/j.engfracmech.2025.111008","url":null,"abstract":"<div><div>Prediction of hydrogen embrittlement requires a robust modelling approach and this will foster the safe adoption of hydrogen as a clean energy vector. A generalised computational model for hydrogen embrittlement is here presented, based on a phase field description of fracture. In combination with Part I of this work, which describes the process of hydrogen uptake and transport, this allows simulating a wide range of hydrogen transport and embrittlement phenomena. The material toughness is defined as a function of the hydrogen content and both elastic and elastic–plastic material behaviour are incorporated, enabling to capture both ductile and brittle fractures, and the transition from one to the other. The accumulation of hydrogen near a crack tip and subsequent embrittlement is numerically evaluated in a single-edge cracked plate, a boundary layer model and a 3D vessel case study, demonstrating the potential of the framework. Emphasis is placed on the numerical implementation, which is carried out in the finite element package COMSOL Multiphysics, and the models are made freely available.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 111008"},"PeriodicalIF":4.7,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143636779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel distribution function for modeling oxygen diffusion in functionally graded materials with cracks","authors":"Robert Lammert,&nbsp;Vera E. Petrova,&nbsp;Stefan Weihe","doi":"10.1016/j.engfracmech.2025.111006","DOIUrl":"10.1016/j.engfracmech.2025.111006","url":null,"abstract":"<div><div>Oxygen diffusion in a functionally graded material (FGM) is modeled by an elastic modulus profile that covers the FGM and the thermally grown oxide (TGO) areas. The profile is based on a novel Gaussian-like distribution that becomes an adaptive weight function by scaling, shifting and using a (symmetry breaking) median adjustment parameter. The properties of this new type of distribution are analyzed and the pure FGM (no oxygen) is compared with the FGM+TGO scenario for a semi-infinite structure with three edge cracks. The fracture analysis is based on critical loads, determined for different crack distances and inclination angles.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 111006"},"PeriodicalIF":4.7,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fracture load prediction of components weakened by symmetrical and asymmetrical rounded-tip V-notches using the phase field method","authors":"Alireza Ashkpour ,&nbsp;Jamal Bidadi ,&nbsp;Hamed Saeidi Googarchin ,&nbsp;Hsiao Wei Lee ,&nbsp;Li Meng ,&nbsp;Ahmad R. Najafi","doi":"10.1016/j.engfracmech.2025.111014","DOIUrl":"10.1016/j.engfracmech.2025.111014","url":null,"abstract":"<div><div>This paper presents an investigation into the fracture behavior of the engineering components weakened by V-notches, using the phase field method. The study employs a combined experimental-numerical approach to evaluate the effectiveness of the phase field model to predict the fracture load of samples with different materials under mode I loading. In the first step, symmetrical rounded-tip V-notched (RV) Compact Tension (CT) samples made of epoxy resin were fabricated and experimentally tested to determine their corresponding fracture load and fracture path under mode I loading in different notch geometrical configurations (e.g., opening angle and notch-tip radius). Experimental results of CT samples were then compared with phase field simulations. The phase field simulation results were further validated against the experimental data from the literature on three-point bending (TPB) specimens made of graphite. There was a close agreement between the numerical and experimental fracture loads across all tested materials. Notably, the phase field simulations showed higher accuracy for RV notches with larger radii when compared to experimental results. Furthermore, the study evaluated the effect of asymmetry in notch geometrical configurations on the strength variation of the components containing notches. Mode mixity parameter (<span><math><msub><mrow><mi>M</mi></mrow><mrow><mi>V</mi></mrow></msub></math></span>) was computed for each one of the assessed samples by utilizing the magnitude of stress ahead of the notch tip. The effect of opening angle and notch-tip radius were evaluated for RV-notches to determine the contribution of each parameter to the variation of the fracture load due to the existence of asymmetry. The study showed that the highest amount of strength reduction due to asymmetry happened in RV-notches with smaller notch radius. Besides, it was found that the fracture load decreased by increasing asymmetry angle. However, the results showed no significant further reduction in strength after reaching a certain threshold of asymmetry.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 111014"},"PeriodicalIF":4.7,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143636609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fracturing characteristics of unconfined rock plate subjected to point-plate loading","authors":"Hao Huang ,&nbsp;Peitao Wang ,&nbsp;Boran Huang ,&nbsp;Guoye Jing ,&nbsp;Meifeng Cai","doi":"10.1016/j.engfracmech.2025.111047","DOIUrl":"10.1016/j.engfracmech.2025.111047","url":null,"abstract":"<div><div>Key factors determining hob rock-breaking efficiency include hob penetration velocity, cutter spacing, rock strength, and surrounding rock characteristics. Using CAD and PFC codes, 3D mechanical analysis models were developed for single and double-hob rock-breaking. The effects of penetration velocity, cutter spacing, rock strength, and lateral constraints on the process were examined. Insights gained revealed the rock-breaking mechanism, its adaptability, and optimal blade spacing. Key findings encompass destructive load, crack penetration, and rock mass morphological changes. Rock damage shows a ‘Y’ pattern, influenced by mineral composition and weathering. Crack widths vary, with increased surface roughness from core to lateral surfaces. Lateral constraints positively correlate intrusion rate with damage area and stress concentration. The destructive load triggers stress field transitions, resulting in multiple fracture surfaces. Limited deformation under constraints causes multiple load peaks, exceeding compressive stress. The resulting blocks have larger, flaky structures with distributed cracks. Cutter spacing significantly affects block formation, with narrower spacings favoring flaky slag production. Optimal blade spacing inversely correlates with rock strength.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 111047"},"PeriodicalIF":4.7,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the efficiency of energy transfer in the blasting with different coupling mediums for deep rock mass excavation","authors":"Jianhua Yang ,&nbsp;Chao Peng ,&nbsp;Zhiwei Ye ,&nbsp;Chi Yao ,&nbsp;Xiaobo Zhang ,&nbsp;Yongli Ma ,&nbsp;Chuangbing Zhou","doi":"10.1016/j.engfracmech.2025.111048","DOIUrl":"10.1016/j.engfracmech.2025.111048","url":null,"abstract":"<div><div>Geostress diminishes the energy utilization of explosives in deep rock mass blasting excavation. The water as a coupling medium in borehole is advantageous to improving the blasting effect and energy utilization in deep rock mass blasting due to its good load transfer effect. However, the theories of water-coupling blasting (WCB) for the deep rock mass excavation are imperfect and the relevant parameters are determined empirically with reference to the standards for air-coupling blasting (ACB). This study focuses on the differences in energy transfer between WCB and ACB. Based on the superposition of blasting stress and geostress, the failure characteristics and energy distribution were investigated under different charging structures and geostress levels in WCB and ACB for deep rock mass excavation. The results reveal that, in both WCB and ACB, as the increasing geostress, the energy consumed in the crushed zone remains relatively constant, while the energy consumed in the crack zone decreases, and the energy consumed in the elastic vibration zone increases. Furthermore, when the geostress is below 40 MPa, it has barely effect on the total energy transferred into the rock mass, but adjusts the proportion of effective energy to ineffective energy. The percentage of total energy transferred into the rock mass in WCB is about triple that in ACB. The effective energy declines with the increasing geostress, while ineffective energy shows the opposite trend. Further, an interesting finding is that the ratio of effective energy and ineffective energy in WCB compared to those in ACB increases with the increasing decoupling coefficient at a geostress of 20 MPa. Compared to the condition of smaller decoupling coefficients, the advantages of WCB over ACB is more obvious under larger decoupling coefficients. Meanwhile, the energy associated with the blasting cavity and blasting vibrations in both WCB and ACB was also discussed. Ultimately, the reliability of this study has been tentatively confirmed by combining theoretical analysis with numerical simulation results.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 111048"},"PeriodicalIF":4.7,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphology of buoyancy-driven multiple hydraulic fractures","authors":"Andreas Möri ,&nbsp;Egor Dontsov ,&nbsp;Brice Lecampion","doi":"10.1016/j.engfracmech.2025.111005","DOIUrl":"10.1016/j.engfracmech.2025.111005","url":null,"abstract":"<div><div>We investigate the problem of simultaneous propagation of multiple hydraulic fractures in situations when the effect of buoyancy is important. While such fractures often occur in nature as magmatic dikes, they also bear technological relevance. For instance, some petroleum reservoirs have strong upward stress gradient and multiple hydraulic fractures are often created simultaneously from a horizontal well to promote operational efficiency. More recently, enhanced geothermal systems employed a similar multi-fracture from a horizontal well approach to stimulate more homogeneous hot rock. The stress state in the latter rock formations is often dominated by a constant stress gradient and promotes buoyancy effects. In geothermal applications, there is at least one more additional well that is drilled to establish circulation. Connectivity between the wells is therefore a crucial aspect of the treatment design. For this reason, we aim to investigate hydraulic fracture morphology of multiple fractures, since it is directly related to connectivity between the wells. To address the problem, we utilize a recently constructed parametric space for a single buoyancy-driven hydraulic fracture, and analyze the fracture shapes for the multi-fracture cases in this dimensionless space to ensure coverage of all possible scenarios. We find that hydraulic fractures exhibit instabilities in all of the cases by trying to prevent an overlap between the fractures. As a result, fractures form multiple fracture “heads” or fingers. At the same time, the results noticeably depend on the fracture propagation regime respectively on the location in the parametric space. In particular, horizontal fracture extension, vertical fracture height, aperture, and the number of “heads” vary considerably within the parametric space. Implications of the results to practical applications are discussed and recommendations on instability avoidance are provided.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 111005"},"PeriodicalIF":4.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143636610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulation of ductile damage in pipeline steels across different constraint conditions using a combined void growth and coalescence model","authors":"Arnav Rana,&nbsp;Ronald E. Miller,&nbsp;Xin Wang","doi":"10.1016/j.engfracmech.2025.111027","DOIUrl":"10.1016/j.engfracmech.2025.111027","url":null,"abstract":"<div><div>Finite element method (FEM) simulations using a two-surface Gurson-like ductile damage model were used to investigate the ductile crack growth behaviors on X80 and X100 pipeline steels, under a wide range of constraint conditions. The implemented approach combines models in the spirit of the Gologanu-Leblond-Devaux (GLD) and Thomason’s models to create a combined void growth and coalescence model. The implemented model can account for several ductile damage anisotropies which cannot be accommodated by the widely used standard Gurson-Tvergaard-Needleman (GTN) model, which is limited to constraint conditions similar to the data used to calibrate the model. It is demonstrated in the study that the implemented combined model significantly improves upon the GTN model and can accurately predict the ductile fracture behavior over a wide range of constraint conditions based on the same calibration data. The ductile damage model was used to analyze ductile crack growth behaviors in single-edge notched bending (SENB) and single-edge notched tension (SENT) specimens. Three different pipeline steels were studied. A wide range of SENT crack geometries were analyzed. These specimens represented a wide range of constraint conditions. The numerically calculated crack growth resistance curves were compared to experimental <span><math><mi>J</mi></math></span>-<span><math><mrow><mi>Δ</mi><mi>a</mi></mrow></math></span> curves and curves developed using the GTN model.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"320 ","pages":"Article 111027"},"PeriodicalIF":4.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}