Engineering Fracture Mechanics最新文献

{"title":"Impact of Voronoi network irregularities and polymer infiltration on the stress intensity factor of 3D-printed bone scaffolds","authors":"Zakiye Nazari,&nbsp;Behnam Ameri,&nbsp;Fathollah Taheri‐Behrooz","doi":"10.1016/j.engfracmech.2025.111292","DOIUrl":"10.1016/j.engfracmech.2025.111292","url":null,"abstract":"<div><div>Developing bone scaffolds with enhanced mechanical properties is critical for improving their performance in tissue engineering applications. This study explores the effect of Voronoi network irregularities and polymer infiltration on the fracture behavior of 3D-printed polylactic acid (PLA) scaffolds. PLA scaffolds of different relative densities (25 %, 40 %, and 100 %) and irregularity factors (0 to 1) were fabricated by fused deposition modeling and infiltrated with chitosan polymer. Finite element analysis, fracture tests, and digital image correlation techniques were carried out to determine the mixed-mode (I/II) stress intensity factors. It was found that a moderate irregularity coefficient of 0.5 significantly improved fracture toughness, with an improvement of 24.15 % compared to regular scaffolds. Scaffolds with a 40 % relative density possessed the optimal balance between strength and porosity, leading to a 43 % higher <span><math><msub><mi>K</mi><mrow><mi>If</mi></mrow></msub></math></span> than scaffolds of 25 % density. The research further illustrated that an increase in the crack length ratio escalates stress intensity factors, whereas excessive irregularities diminish structural integrity. Adding chitosan improved mode II fracture resistance, with <span><math><msub><mi>K</mi><mrow><mi>IIf</mi></mrow></msub></math></span> reaching its maximum at the highest levels of irregularity and crack length ratio.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111292"},"PeriodicalIF":4.7,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144241943","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":"Dynamic fracture analysis of multi-layer composites using an improved RHT model","authors":"Sobhan Pattajoshi ,&nbsp;Sonalisa Ray","doi":"10.1016/j.engfracmech.2025.111220","DOIUrl":"10.1016/j.engfracmech.2025.111220","url":null,"abstract":"<div><div>The present study investigates the dynamic fracture behaviour of concrete in multi-layer composite targets subjected to projectile impact loading. The Riedel, Hiermaier, and Thoma (RHT) model is widely used for simulating concrete damage under impact and extreme loading conditions. While the original RHT model provides reasonable penetration depth and residual velocity predictions, it has notable limitations in capturing tensile failure mechanisms, particularly spalling damage and tensile cracking. An improved RHT (M-RHT) model has been proposed to address these shortcomings, incorporating an exponential hydrostatic expansion damage model and an exponential tensile crack-softening damage model within a user-defined material subroutine. These modifications enable more accurate predictions of spalling damage and dynamic crack paths. The effectiveness of the proposed M-RHT model is demonstrated through single-element simulations, showing a significant improvement in the representation of tensile damage evolution. The model is further validated using projectile penetration simulations, where it accurately predicts damage sizes, crack propagation, and residual velocities, aligning well with experimental observations. The improved RHT model has been applied to simulate the projectile impact on the multi-layer composite target. Compared to the original RHT model, the M-RHT model exhibits improved damage predictions in multi-layer composite targets by accurately capturing spalling and tensile cracking.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111220"},"PeriodicalIF":4.7,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213330","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":"Hydrogen embrittlement and bulk hydrogen: Environments and testing methodologies","authors":"Florian Thébault","doi":"10.1016/j.engfracmech.2025.111278","DOIUrl":"10.1016/j.engfracmech.2025.111278","url":null,"abstract":"<div><div>This paper gathers key observations for a better understanding of the crack growth in carbon and low alloy steels in dry hydrogen gas versus wet sour gas environments. The source of hydrogen for experiments in gaseous hydrogen comes predominantly from the crack tip itself, as a result of the hydrogen inhibiting effect of the native oxide film. In contrast, hydrogen comes predominantly from the bulk of the material in other hydrogen charging modes like sour gas or cathodic polarization. The presence or absence of bulk hydrogen affects the selection of the testing methodologies for material qualification: the fracture mechanics approach is adapted to dihydrogen gas environments whereas smooth specimens, in a sustained load mode, are the basis of testing methodologies in sour environments.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111278"},"PeriodicalIF":4.7,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144205058","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":"Preface to the special issue: “Crack Paths 2024” after CP2024","authors":"Sabrina Vantadori,&nbsp;Francesco Iacoviello,&nbsp;Andrea Carpinteri","doi":"10.1016/j.engfracmech.2025.111279","DOIUrl":"10.1016/j.engfracmech.2025.111279","url":null,"abstract":"","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111279"},"PeriodicalIF":4.7,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588641","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":"Quantitative analysis of energy competition in deep coal rock outburst-rockburst compound dynamic disasters","authors":"Xin Zhang ,&nbsp;Jupeng Tang ,&nbsp;Yishan Pan ,&nbsp;Lingran Ren ,&nbsp;Lei Huang ,&nbsp;Zhonghua Zhang","doi":"10.1016/j.engfracmech.2025.111256","DOIUrl":"10.1016/j.engfracmech.2025.111256","url":null,"abstract":"<div><div>A novel experimental methodology was designed and true triaxial disaster-inducing tests with different simulation depths were conducted. The competition evolution mechanism of elastic energy and gas expansion energy during the disaster incubation has been explored. The results show that the types of compound dynamic disasters are primarily influenced by factors like stress, gas pressure and coal seam physical properties. As gas pressure varies, the gas expansion energy and elastic energy exhibit opposing evolutionary trends, leading to competitive accumulation between the two forms of energy. With increased relative outburst intensity, the crushing work increases while the average particle dimension decreases, leading to intensified coal pulverization and heightened destructiveness of outburst-rockburst events. The energy dissipation of the outburst-rockburst compound dynamic disaster is mainly attributed to the energy induced by the fracture and impact of the roof after outburst (58 %∼61 %), while that of the rockburst-outburst compound dynamic disaster is dominated by the crushing work (63 %∼70 %). Based on the energy conservation law, an energy criterion for outburst-rockburst compound dynamic disasters induced by instability of deep gas-bearing coal rock is established. By combining the proportions of coal rock release energy and gas release energy, the disaster-inducing transformation intervals are divided, and energy critical values are given.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"324 ","pages":"Article 111256"},"PeriodicalIF":4.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168500","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":"Experimental investigation of static and dynamic compressive behavior of carbon fiber reinforced concrete at elevated temperatures","authors":"Zichen Wang ,&nbsp;Liang Li ,&nbsp;Jun Wu ,&nbsp;Xiuli Du ,&nbsp;Hongwei Wang ,&nbsp;Gang Du","doi":"10.1016/j.engfracmech.2025.111275","DOIUrl":"10.1016/j.engfracmech.2025.111275","url":null,"abstract":"<div><div>This study investigates the static and dynamic compressive performance of carbon fiber reinforced concrete (CFRC) from 200 °C to 800 °C, enhancing the understanding of its behavior under coupled conditions of elevated temperatures and impact loading. The effects of strain rate, temperature, fiber volume fraction, and matrix strength on the mechanical properties of CFRC were systematically analyzed using a split Hopkinson pressure bar (SHPB). Results indicate that strain rate has a pronounced strengthening effect on dynamic properties. While carbon fibers have a limited impact on compressive strength, they significantly reduce specimen damage under high temperatures and dynamic loading.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"324 ","pages":"Article 111275"},"PeriodicalIF":4.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144148028","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":"Theoretical understanding of fracture toughness improvement in carbon nanotube-coated fiber/epoxy composites: A multiscale study","authors":"Jae Hun Kim,&nbsp;Jihun Lee,&nbsp;Haolin Wang,&nbsp;Hyunseong Shin","doi":"10.1016/j.engfracmech.2025.111276","DOIUrl":"10.1016/j.engfracmech.2025.111276","url":null,"abstract":"<div><div>In this study, the mechanisms underlying fracture toughness improvement in carbon nanotube (CNT)-coated fiber/epoxy composites were investigated using multiscale analysis. To capture the macroscopic toughening mechanisms (such as crack path deflection induced by the fiber), a phase field fracture simulation was employed. A multiscale fracture model incorporated microscopic toughening mechanisms (including interfacial debonding, subsequent plastic nano-void growth, and pull-out of the nanotubes) during macroscopic crack propagation. Results indicate that at the mesoscale, the energy dissipation increases with CNT volume fraction, emphasizing the critical role of CNT modification in enhancing fracture toughness. Furthermore, the CNT coating layer, characterized by a high CNT volume fraction, facilitated significant energy dissipation, further enhancing the overall fracture toughness of the CNT-fiber/epoxy composites. In conclusion, macroscopic cracks frequently propagate across the coating layer, contributing to significant energy dissipation during crack propagation.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111276"},"PeriodicalIF":4.7,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178113","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":"Tensile ductility of an aluminium alloy: Experiments and simulations with a porous plasticity model","authors":"David Morin,&nbsp;Lars Edvard Blystad Dæhli,&nbsp;Odd Sture Hopperstad","doi":"10.1016/j.engfracmech.2025.111206","DOIUrl":"10.1016/j.engfracmech.2025.111206","url":null,"abstract":"<div><div>In this study, we investigate the modelling of ductile failure in an aluminium alloy in different temper conditions. We propose using a porous plasticity model with a stress-enhanced nucleation rule to describe the ductile failure process that is assumed to be closely related to the presence of particles. The primary objective is to determine if a single set of failure parameters can be used to describe the ductility of the aluminium alloy in several temper conditions. To support this investigation, tension tests are carried out on smooth and notched samples made from an extruded plate of aluminium alloy AA6110. By varying the heat treatment of the alloy, four materials are considered with different strength, work hardening, and ductility, while the grain structure and the distribution of the constituent particles are unchanged. A secondary objective is to evaluate a cost-efficient calibration procedure for the porous plasticity model. Finite element simulations of the tension tests show that the calibration procedure is accurate and that the same set of failure parameters can be used for all four temper conditions with acceptable accuracy when using the stress-enhanced nucleation rule.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"325 ","pages":"Article 111206"},"PeriodicalIF":4.7,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144190498","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 proppant transport in dynamic fracture networks using Eulerian-Eulerian method","authors":"Changxin Yang ,&nbsp;Cheng Ma ,&nbsp;Zhaozhong Yang ,&nbsp;Hehua Wang ,&nbsp;Jianhua Qu ,&nbsp;Liangping Yi ,&nbsp;Duo Yi ,&nbsp;Yang Li","doi":"10.1016/j.engfracmech.2025.111264","DOIUrl":"10.1016/j.engfracmech.2025.111264","url":null,"abstract":"<div><div>The effectiveness of hydraulic fracturing is largely determined by the fracture propagation and proppant transport, while the numerical simulation of proppant transport in dynamic hydraulic fracture (HF) is a critical yet challenging computational problem. Based on the displacement discontinuity method (DDM) and finite volume method (FVM), an integrated hydraulic fracturing simulator is established by coupling a non-planer three-dimensional fracture propagation model with a Eulerian-Eulerian proppant transport model. The embedded discrete fracture model (EDFM) is adopted to describe the fluid flow between fracture and matrix. The fluid–solid coupling equations for fracture deformation and fluid flow are derived, and the one-way coupling strategy is employed to model the proppant transport in dynamic fracture networks. To avoid the problem of numerical oscillations, the high-order spatial and temporal discretization schemes are introduced. The fracture propagation and proppant transport models are validated by analytical solutions and published numerical results. Compared with the low-order discretization strategy, a more precise prediction of proppant distribution in dynamic HF can be obtained with high-order discretization schemes. Based on the established model, the parametric sensitivity analysis is conducted to investigate the intricate interaction between proppant transport and complex fracture propagation. The results show that the accumulation and bridging of proppant can promote the full opening of natural fracture (NF) during hydraulic fracturing. Increasing the proppant particle size and decreasing the injection rate, despite being detrimental to proppant transport efficiency, are instrumental in the formation of a stable temporary plugging zone. Moreover, the characteristics of fluid pressure reflect the formation process of temporary plugging zones and the propagation patterns of HF. A higher fracture propagation pressure signifies the successful establishment of the temporary plugging zone, which facilitates the creation of complex fracture networks during hydraulic fracturing.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"324 ","pages":"Article 111264"},"PeriodicalIF":4.7,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134336","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":"Enhanced toughening in biocomposites by pinning and bridging effects","authors":"Ji-Tong Wu,&nbsp;Gan-Yun Huang,&nbsp;Liao-Liang Ke","doi":"10.1016/j.engfracmech.2025.111274","DOIUrl":"10.1016/j.engfracmech.2025.111274","url":null,"abstract":"<div><div>The excellent mechanical properties of ‘brick-and-mortar’ structure biological materials such as shells, bones, horns have attracted a plenty of theoretical and numerical works to reveal the toughening mechanisms involved. In this work, a mechanical model has been established by taking into account the effects of both bridging and pinning under plane strain deformation. The toughening ratio has been calculated and compared with that with mere bridging effect, which demonstrates that pinning effect makes an enhanced contribution to the toughness of biocomposites. The effect of interfacial shear strength on pinning effect has also been discussed. The obtained results are expected to provide more insights into the toughening mechanisms and the bionic toughening designs.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"324 ","pages":"Article 111274"},"PeriodicalIF":4.7,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138699","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}