Engineering Fracture Mechanics最新文献_第10页

Investigation of a secondary bonded pultrusion composite laminate containing a ply-drop, Part 2: A novel two-dimensional hybrid fracture discrete element for producing debond failure 含有层降的二次粘接拉挤复合材料层压板的研究，第 2 部分：用于产生脱粘失效的新型二维混合断裂离散元素

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2024-09-17 DOI: 10.1016/j.engfracmech.2024.110494

引用次数: 0

Enhancing fatigue performance of AA6063-T6 fasteners through novel electromagnetic cold expansion using a double-frequency discharge 利用双频放电的新型电磁冷膨胀技术提高 AA6063-T6 紧固件的疲劳性能

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2024-09-17 DOI: 10.1016/j.engfracmech.2024.110509

{"title":"Enhancing fatigue performance of AA6063-T6 fasteners through novel electromagnetic cold expansion using a double-frequency discharge","authors":"","doi":"10.1016/j.engfracmech.2024.110509","DOIUrl":"10.1016/j.engfracmech.2024.110509","url":null,"abstract":"<div><p>Non-contact electromagnetic cold expansion process (EMCE) represents a highly promising way to enhance the fatigue performance of fasteners. However, within the current technological framework, the necessity for dual power supplies and an accurate discharge control system has constrained the development and application of this technique. To address this, a novel EMCE process utilizing a double-frequency discharge is proposed. This process is accompanied by the development of an electromagnetic system with only one set of power supply to generate a current composed of a gradual-ascending and rapid-descending stage. This current induces a significant radially outward Lorentz force, facilitating hole expansion and introducing residual compressive stress around the hole, thus increasing the fatigue life of the fasteners. The experimental results demonstrate a remarkable enhancement in fatigue life for samples treated with the EMCE process when compared to untreated ones, showing an impressive 6.8-fold, 4.9-fold, and 1.6-fold increase at stress loads of 120 MPa, 130 MPa, and 150 MPa, respectively. Microstructural analysis reveals that the processed components exhibit favorable surface integrity, and there is no significant grain refinement near the hole. Moreover, it is found that there existed optimal current waveform to maximize fatigue life. These findings hold significance in understanding the EMCE process and advancing its practical applicability.</p></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142271430","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}

引用次数: 0

Modulating the fracture behavior of interface cracks via electric field gradient in flexoelectric solids 通过挠性固体中的电场梯度调节界面裂缝的断裂行为

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2024-09-17 DOI: 10.1016/j.engfracmech.2024.110504

引用次数: 0

Finite element modelling of crack propagation under vibration spectrum based on local tip continuum damage dynamics 基于局部尖端连续损伤动力学的振动频谱下裂纹扩展有限元建模

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2024-09-16 DOI: 10.1016/j.engfracmech.2024.110495

{"title":"Finite element modelling of crack propagation under vibration spectrum based on local tip continuum damage dynamics","authors":"","doi":"10.1016/j.engfracmech.2024.110495","DOIUrl":"10.1016/j.engfracmech.2024.110495","url":null,"abstract":"<div><div>The shift of the dynamic response of a structural part during the propagation of embedded defects may have a significant effect over its remaining fatigue life, of particular relevance in components subjected to severe vibration environment. Traditional high cycle fatigue approaches predict the safe-life of the part based on the number of cycles required for fatigue crack nucleation, i.e. based on an un-propagated crack condition stress state. This work prospects the incorporation of a local tip-based continuum damage model into the elastodynamic finite element discretization of cracked specimens exposed to vibratory excitation. The resulting ‘continuum damage dynamics’ algorithm performs the coupled, interdependent updates of fatigue damage accumulation, modal decomposition and dynamic response at each step of the simulation. The study explores scenarios of excitation close to resonance and assesses the sensitivity to the damping ratio, the mesh size and the material characterization for the plasticity-dominated region surrounding the crack tip. The proposed numerical scheme allows to estimate the fatigue life and to recreate the dynamic crack propagation measured in physical tests with fixed and random forcing frequencies.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142322615","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}

引用次数: 0

Experimental and numerical investigations on the mechanical properties of coral aggregate seawater concrete 珊瑚骨料海水混凝土力学性能的实验和数值研究

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2024-09-16 DOI: 10.1016/j.engfracmech.2024.110498

{"title":"Experimental and numerical investigations on the mechanical properties of coral aggregate seawater concrete","authors":"","doi":"10.1016/j.engfracmech.2024.110498","DOIUrl":"10.1016/j.engfracmech.2024.110498","url":null,"abstract":"<div><p>To study the mechanical properties of coral aggregate seawater concrete (CASC), a combination of experiments and numerical simulations based on the HJC and K&C models was used, the failure mode and cube compressive/axial compressive/splitting tensile strength (<em>f</em><sub>cu</sub>, <em>f</em><sub>c</sub>, <em>f</em><sub>sp</sub>), complete stress–strain curve of CASC with different strength grades (C30 ∼ C55) and cement types (Portland cement, Basic magnesium sulfate cement) was studied, and the differences in the mechanical properties of CASC with lightweight aggregate concrete and ordinary aggregate concrete was revealed. The results show that: cube/prismatic/splitting tensile specimens of CASC mainly suffer from quadrangular cone damage/oblique damage/central cracking damage, respectively. BMSC can significantly reduce the brittleness and increase the ductility of CASC. A significant linear relationship between <em>f</em><sub>cu</sub> and <em>f</em><sub>c</sub>, <em>f</em><sub>sp</sub> for C30 ∼ C50 CASC was found and the corresponding transformations was established. The numerical model suitable for researching the mechanical properties of CASC was proposed, the errors between simulated and measured values of <em>f</em><sub>cu</sub>, <em>f</em><sub>c</sub> and <em>f</em><sub>sp</sub> of C30 ∼ C50 CASC were 2.5 % ∼ 3.1 %, 4.4 % ∼ 5.7 % and 2.7 % ∼ 4.4 %, respectively. Considering the characteristics of high brittleness of CASC, a more suitable stress–strain curve model is proposed, the accuracy can be improved by 1.6 % ∼ 5.9 %.</p></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142271433","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}

引用次数: 0

Fracture failure analysis of plastic fiber based on thermodynamic strength theory and experiment 基于热力学强度理论和实验的塑料纤维断裂失效分析

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2024-09-16 DOI: 10.1016/j.engfracmech.2024.110505

{"title":"Fracture failure analysis of plastic fiber based on thermodynamic strength theory and experiment","authors":"","doi":"10.1016/j.engfracmech.2024.110505","DOIUrl":"10.1016/j.engfracmech.2024.110505","url":null,"abstract":"<div><p>In order to analyze the mechanical behavior of plastic fiber bundle, a theoretical model considering elastic and plastic behavior of single fiber is established. Based on uniaxial tensile tests of polythene single fiber, elastoplastic mechanical properties, such as elastic modulus and plastic modulus, are obtained. Moreover, distributions of yield strength and breaking strength of single fiber are determined. The stress–strain curve of polythene fiber bundle is predicted by theoretical model. The correctness of this theoretical model is verified by uniaxial tensile test of polythene fiber bundle. All experimental data points are within the range predicted by theoretical model. Some key parameters which regulate mechanical behavior of single fiber are investigated theoretically. Results show that Weibull parameters of yield strength and breaking strength of single fiber have great effect on mechanical performance of fiber bundle. The concentration of distribution area of breaking strength can improve the overall fracture strength of fiber bundle. Results and conclusions in this investigation can extend and perfect fiber bundle model in terms of plastic behavior.</p></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240634","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}

引用次数: 0

A new improved 3D Hoek-Brown criterion 新的改进型三维霍克-布朗准则

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2024-09-15 DOI: 10.1016/j.engfracmech.2024.110499

引用次数: 0

Adaptive PF-CZM for multiphysics fracture analysis in functionally graded materials 用于功能分级材料多物理场断裂分析的自适应 PF-CZM

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2024-09-14 DOI: 10.1016/j.engfracmech.2024.110461

{"title":"Adaptive PF-CZM for multiphysics fracture analysis in functionally graded materials","authors":"","doi":"10.1016/j.engfracmech.2024.110461","DOIUrl":"10.1016/j.engfracmech.2024.110461","url":null,"abstract":"<div><div>Functionally graded materials (FGM) hold significant relevance in engineering due to their tailored material property gradation, designed for specific engineering applications. The challenge in fracture analysis of FGM stems from the spatial variation of material properties, which complicates the prediction of crack topology. Local and global refinement strategies are impractical for fracture analysis in FGM due to the unpredictable nature of crack topology, which renders local refinement infeasible. Additionally, global refinement is not advisable as it leads to a significant increase in degrees of freedom, adversely affecting computational efficiency.</div><div>The novelty of this research lies in the incorporation of spatial variation in both the length scale and material properties, enhancing the realism of FGM domain modeling. To preserve the required length scale, it is necessary to adopt a minimum mesh size, which consequently results in a substantial increase in the degrees of freedom and, thereby, escalates the computational cost. To address these challenges, the study employs an adaptive mesh refinement (AMR) algorithm integrated with a phase-field cohesive zone model (PF-CZM), providing a robust solution for accurate fracture analysis in FGM. Based on the ideas stemming from the need for efficient and realistic modeling, the AMR-PF-CZM framework refines the mesh efficiently in regions of crack growth based on crack-driving energy and phase field variable, thereby eliminating the need for pre-refinement. The findings demonstrate a 76%–85% increase in computational efficiency and accuracy of the AMR-PF-CZM approach compared to the non-adaptive PF-CZM. Furthermore, the developed algorithm’s applicability to dynamic fracture and multi-physics problems, specifically addressing mechanical and thermal fracture in FGM, underscores the importance of this approach in capturing complex fracture phenomena.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142310249","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}

引用次数: 0

On the critical mechanisms for the embrittlement and strength degradation of post-irradiated U-10Mo fuels 关于辐照后 U-10Mo 燃料脆化和强度退化的关键机制

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2024-09-14 DOI: 10.1016/j.engfracmech.2024.110474

{"title":"On the critical mechanisms for the embrittlement and strength degradation of post-irradiated U-10Mo fuels","authors":"","doi":"10.1016/j.engfracmech.2024.110474","DOIUrl":"10.1016/j.engfracmech.2024.110474","url":null,"abstract":"<div><div>The four-point bending experimental findings clearly indicated that the post-irradiated U-10Mo fuels underwent noticeable macroscale embrittlement and strength degradation. During the irradiation process, fission gas bubbles (FGBs) are continuously formed and accumulated around the grain boundaries. Additionally, the irradiation-induced damage may lead to the degradation of mechanical properties of the U-10Mo skeleton. In this study, the representative volume element (RVE) models for post-irradiated U-10Mo fuels including the bubble-contained region and no-bubble region are established. Based on the Continuum Damage Mechanics (CDM) theory, the tensile test simulations are performed with the RVE models to obtain the macroscale stress–strain curves, using three assumed mechanical properties for the skeleton in the bubble-contained region. The research outcomes reveal that the strength degradation and fracture strain reduction of the U-10Mo fuel skeleton in the bubble-contained region are the dominant factors of the macroscale irradiation embrittlement and strength degradation of post-irradiated U-10Mo fuels. Furthermore, the FGBs enhanced local porosity aggravates this effect. This study sheds light on the mechanisms of irradiation-induced macroscale embrittlement and strength degradation in irradiated fuels, providing crucial insights for the safety assessment of fuel elements and components.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142310250","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}

引用次数: 0

Shrinkage cracking law and anti-crack inverse design in early-age concrete: A novel perspective on the development of crack resistance properties 早龄期混凝土的收缩开裂规律和抗裂反设计：抗裂性能发展的新视角

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2024-09-13 DOI: 10.1016/j.engfracmech.2024.110395

{"title":"Shrinkage cracking law and anti-crack inverse design in early-age concrete: A novel perspective on the development of crack resistance properties","authors":"","doi":"10.1016/j.engfracmech.2024.110395","DOIUrl":"10.1016/j.engfracmech.2024.110395","url":null,"abstract":"<div><p>Early-age cracking in massive concrete has long attracted research focus, essentially governed by the game between crack driving and resistance. However, cracking resistance aspect received inadequate attention. This study examines the impact of crack resistance properties development processes on shrinkage cracking law in early-age concrete, employing chemo-thermo-mechanical coupling phase-field model. Two quantitative evaluation indicators, namely the index of damage development and average growth rate of maximum damage, are introduced to characterize the process of damage and cracking. The findings demonstrate that the development processes of elastic modulus and tensile strength exert a considerable influence on shrinkage cracking process in early-age concrete, whereas the impact of fracture energy development process is insignificant. Multifactor analysis revealed substantial coupling effects among parameters. Additionally, an anti-crack reverse design method is proposed based on the global optimization analysis, which can guide the optimization design of shrinkage crack prevention and control in early-age concrete from both perspectives of crack driving and crack resistance.</p></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240632","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}

引用次数: 0