International Journal of Fracture最新文献

{"title":"Three-dimensional constraint-based void-growth model for high temperature hydrogen attack","authors":"K. Vijayvargia,&nbsp;M. Dadfarnia,&nbsp;P. Sofronis,&nbsp;M. Kubota,&nbsp;A. Staykov,&nbsp;K. Wada,&nbsp;J. A. Pugh,&nbsp;T. J. Eason","doi":"10.1007/s10704-023-00739-2","DOIUrl":"10.1007/s10704-023-00739-2","url":null,"abstract":"<div><p>High temperature hydrogen attack (HTHA) is degradation of steels exposed to hydrogen gas at high temperatures and pressures. Hydrogen in steels reacts with carbon from carbides to produce methane gas bubbles typically on grain boundaries which grow and coalesce, leading to loss of strength and fracture toughness. Current design practice against HTHA is based on the Nelson curves which define the conditions for safe operation in a temperature/hydrogen-partial-pressure diagram. Nelson curves are phenomenological in nature and do not account for the underlying failure mechanism(s), material microstructure, carbide stability, and applied stresses. In light of experimental evidence of predominant cavitation ahead of cracks reported by Martin et al. (Acta Mater 140:300–304, 2017), it is expected that void growth is accelerated by the triaxial stresses associated with microstructural flaws. To this end, we propose a three-dimensional, axisymmetric, constraint-based void-growth model extending the “one-dimensional” model of Dadfarnia et al. (Int J Fract 219:1–17, 2019). The present model is shown to yield satisfactory agreement with the available experimental data from hydrogen attack of 2¼Cr–1Mo steel at temperatures ranging from 500 to 600 °C. In addition, the model is used to construct Nelson type curves in the temperature/hydrogen-partial-pressure diagram. These curves represent failure times for given applied stresses and triaxiality. The proposed methodology can be viewed as providing a step toward improving the current design practice against HTHA while maintaining the simplicity of the original Nelson curve approach.</p></div>","PeriodicalId":590,"journal":{"name":"International Journal of Fracture","volume":"243 2","pages":"203 - 228"},"PeriodicalIF":2.5,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10704-023-00739-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41083978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Dynamic rupture forewarned by a displacement field criterion","authors":"Qiansheng Zhang,&nbsp;Shengwang Hao,&nbsp;Derek Elsworth","doi":"10.1007/s10704-023-00737-4","DOIUrl":"10.1007/s10704-023-00737-4","url":null,"abstract":"<div><p>Ground-surface accelerations warn of incipient natural hazards—but threshold criteria remain indistinct. We use a model of localizing deformation within a encapsulating compliant halo to accurately project time-to-failure and to discriminate between ultimate stable and unstable rupture. A heterogeneous distribution of displacement histories and relative polarities demark composite zones of local failure. These composite zones accommodate strain accumulation in the localizing core and strain-relaxation in the surround. Balanced rates of strain accumulation and complementary shedding project both a time-to-rupture and anticipated energetics—quiescent of dynamic. This analysis is applied to follow the evolution of both local discrete ruptures and their coalescence into macroscale failure—with equal resolution and success. Apparent is a typical deformation response characterized by creep, relaxation and reload at different positions.</p></div>","PeriodicalId":590,"journal":{"name":"International Journal of Fracture","volume":"243 2","pages":"169 - 184"},"PeriodicalIF":2.5,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41083937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ProCrackPlast: a finite element tool to simulate 3D fatigue crack growth under large plastic deformations","authors":"Rahul Ganesh,&nbsp;Durga Prasanth Dude,&nbsp;Meinhard Kuna,&nbsp;Bjoern Kiefer","doi":"10.1007/s10704-023-00732-9","DOIUrl":"10.1007/s10704-023-00732-9","url":null,"abstract":"<div><p>Many structural components and devices in combustion and automotive engineering undergo highly intensive cyclic thermal and mechanical loading during their operation, which leads to low cycle (LCF) or thermomechanical (TMF) fatigue crack growth. This behavior is often characterized by large scale plastic deformations and creep around the crack, so that concepts of linear-elastic fracture mechanics fail. The finite element software <span>ProCrackPlast </span>has been developed at TU Bergakademie Freiberg for the automated simulation of fatigue crack growth in arbitrarily loaded three-dimensional components with large scale plastic deformations, in particular under cyclic thermomechanical loading. <span>ProCrackPlast </span>consists of a bundle of Python routines, which manage finite element pre-processing, crack analysis, and post-processing in combination with the commercial software <span>Abaqus </span>. <span>ProCrackPlast </span>is based on a crack growth procedure which adaptively updates the crack size in finite increments. Crack growth is controlled by the cyclic crack tip opening displacement <span>(varDelta )</span>CTOD, which is considered as the appropriate fracture-mechanical parameter in case of large scale yielding. The three-dimensional <span>(varDelta )</span>CTOD concept and its effective numerical calculation by means of special crack-tip elements are introduced at first. Next, the program structure, the underlying numerical algorithms and calculation schemes of <span>ProCrackPlast </span>are outlined in detail, which capture the plastic deformation history along with the moving crack. In all simulations, a viscoplastic cyclic material law is used within a large strain setting. The numerical performance of this software is studied for a single edge notch tension (SENT) specimen under isothermal cyclic loading and compared to common finite element techniques for fatigue crack simulation. The capability of this software is featured in two application examples showing crack growth under mixed-mode LCF and TMF in a typical austenite cast steel, Ni-Resist. In combination with a crack growth law identified in terms of <span>(varDelta )</span>CTOD for a specific material, the tool <span>ProCrackPlast </span>is able to predict the crack evolution in a 3D component for a given thermomechanical loading scenario.</p></div>","PeriodicalId":590,"journal":{"name":"International Journal of Fracture","volume":"243 1","pages":"65 - 90"},"PeriodicalIF":2.5,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10704-023-00732-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6551597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Correction to: Experimental investigation of the alternate recurrence of quasi-static and dynamic crack propagation in PMMA","authors":"Raphael Heinzmann,&nbsp;Rian Seghir,&nbsp;Syed Yasir Alam,&nbsp;Julien Réthoré","doi":"10.1007/s10704-023-00736-5","DOIUrl":"10.1007/s10704-023-00736-5","url":null,"abstract":"","PeriodicalId":590,"journal":{"name":"International Journal of Fracture","volume":"243 1","pages":"123 - 123"},"PeriodicalIF":2.5,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6551770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 analysis of the extension to shear fracture transition in a rock analogue material using digital image correlation method","authors":"Huyen Thi Phuong Tran,&nbsp;Hung Sy Nguyen,&nbsp;Stéphane Bouissou","doi":"10.1007/s10704-023-00734-7","DOIUrl":"10.1007/s10704-023-00734-7","url":null,"abstract":"<div><p>This paper presents the results of axi-symmetric extension tests on a Rock Analogue Material that showed a continuous transition from extension fracture to shear fracture with an increase in compressive stress. The analysis used non destructive full-field experimental methods—digital image correlation (DIC), as well as the post-mortem specimens observation. When the mean stress was small, the fractures formed through the mode I cracking at tensile equal to the material tensile strength with smooth surfaces. These surfaces became rougher or delicate plumose patterns as the mean stress increased. Fracture angles also increased progressively from extension fractures to shear fractures. Hybrid fractures formed under mixed tensile and compressive stress states and presented plumose patterns on the rupture surface. DIC results showed the localisation of tensile deformation and the acceleration of deformation at the zone that induced the fracture. The fracture caused a reduction of deformation in the surrounding areas, which showed a release of elastic energy stored in the material during the propagation of fracture.</p></div>","PeriodicalId":590,"journal":{"name":"International Journal of Fracture","volume":"243 1","pages":"91 - 104"},"PeriodicalIF":2.5,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10704-023-00734-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6551734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Transient heat conduction in the cracked medium by Guyer–Krumhansl model","authors":"Wenzhi Yang,&nbsp;Ruchao Gao,&nbsp;Zhijun Liu,&nbsp;Yi Cui,&nbsp;Amin Pourasghar,&nbsp;Zengtao Chen","doi":"10.1007/s10704-023-00727-6","DOIUrl":"10.1007/s10704-023-00727-6","url":null,"abstract":"<div><p>In this article, the nonclassical transient heat propagation process in a cracked strip is investigated by Guyer–Krumhansl (G–K) model, which incorporates both the time lagging behavior and the spatially nonlocal effect. The impulsive thermal loading as well as cyclic loading exerted on the top bounding surface are examined to explore the non-Fourier thermal characteristics. By means of the Laplace transform and Fourier transform, the governing partial differential equations subjected to mixed boundary conditions are converted to a group of singular integral equations. With the aid of numerical Laplace inversion, the transient temperatures are calculated to make comparisons of thermal responses determined by Fourier’s law, Cattaneo–Vernotte (C–V) equation, and G–K model. The numerical results display the specific thermal behaviors of G–K model in the cracked medium and demonstrate the G–K model’s capabilities in eliminating the unrealistic phenomena accompanied by C–V equation. Our research would contribute to achieving a better understanding of the transient heat conduction in small-sized systems or composites at the macroscopic scale.</p></div>","PeriodicalId":590,"journal":{"name":"International Journal of Fracture","volume":"246 2-3","pages":"145 - 160"},"PeriodicalIF":2.2,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45031217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of atomistic modeling parameters on the simulation of fracture in graphene","authors":"M. A. Torkaman-Asadi,&nbsp;M. A. Kouchakzadeh","doi":"10.1007/s10704-023-00728-5","DOIUrl":"10.1007/s10704-023-00728-5","url":null,"abstract":"<div><p>For a wide range of graphene applications, it is required to examine the fracture characteristics of single-layer graphene sheets. In this article, we study the effective parameters in fracture of graphene, concentrating on the impact of atomistic modeling on results that have not been adequately evaluated in previous studies. We considered two distinct models to simulate a uniaxial tensile test in molecular dynamics. By comparing these models, we explore the influence of various parameters on the results, particularly fracture strength and failure strain. We demonstrate that in pristine graphene sheets, failure depends entirely on simulation modeling. The two main factors that lead to these variations are loading patterns and boundary conditions. Based on the models, the obtained results are significantly different. Nevertheless, in pre-cracked graphene, parameters are strongly affected by the initial defect, especially the crack tip. To better understand the parameters affecting the simulation results, we investigate the dependence of the mechanical properties of defective graphene sheets on strain rate and crack tip area. This investigation helps to comprehend these parameters and clarifies some of the reasons for the discrepancies in the literature.</p></div>","PeriodicalId":590,"journal":{"name":"International Journal of Fracture","volume":"244 1-2","pages":"201 - 215"},"PeriodicalIF":2.2,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46499050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variational approach to viscoelastic fracture: comparison of a phase-field and a lip-field approach","authors":"Rajasekar Gopalsamy,&nbsp;Nicolas Chevaugeon,&nbsp;Olivier Chupin,&nbsp;Ferhat Hammoum","doi":"10.1007/s10704-023-00725-8","DOIUrl":"10.1007/s10704-023-00725-8","url":null,"abstract":"<div><p>Fracture of viscoelastic materials is considered to be a complex phenomenon due to their highly rate sensitive behavior. In this context, we are interested in the quasi-static response of a viscoelastic solid subjected to damage. This paper outlines a new incremental variational based approach and its computational implementation to model damage in viscoelastic solids. The variational formalism allows us to embed the local constitutive equations into a global incremental potential, the minimization of which provides the solution to the mechanical problem. Softening damage models in their local form are known to result in spurious mesh-sensitive results, and hence, non-locality (or regularization) has to be introduced to preserve the mathematical relevance of the problem. In the present paper, we consider two different regularization techniques for the viscoelastic damage model: a particular phase-field and a lip-field approach. The model parameters are calibrated to obtain some equivalence between both these approaches. Numerical results are then presented for the bidimensional case and both these approaches compare well. Numerical results also demonstrate the ability of the model to qualitatively represent the typical rate-dependent behaviour of the viscoelastic materials. Besides, the novelty of the present work also lies in the use of lip-field approach for the first time in a viscoelastic context.</p></div>","PeriodicalId":590,"journal":{"name":"International Journal of Fracture","volume":"244 1-2","pages":"163 - 185"},"PeriodicalIF":2.2,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134920320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identifying crack tip position and stress intensity factors from displacement data","authors":"Swati Gupta,&nbsp;Grant West,&nbsp;Mark A. Wilson,&nbsp;Scott J. Grutzik,&nbsp;Derek H. Warner","doi":"10.1007/s10704-023-00729-4","DOIUrl":"10.1007/s10704-023-00729-4","url":null,"abstract":"<div><p>Fracture prognosis and characterization efforts require knowledge of crack tip position and the Stress Intensity Factors (SIFs) acting in the vicinity of the crack. Here, we present an efficient numerical approach to infer both of these characteristics under a consistent theoretical framework from noisy, unstructured displacement data. The novel approach utilizes the separability of the asymptotic linear elastic fracture mechanics fields to expedite the search for crack tip position and is particularly useful for noisy displacement data. The manuscript begins with an assessment of the importance of accurately locating crack tip position when quantifying the SIFs from displacement data. Next, the proposed separability approach for quickly inferring crack tip position is introduced. Comparing to the widely used displacement correlation approach, the performance of the separability approach is assessed. Cases involving both noisy data and systematic deviation from the asymptotic linear elastic fracture mechanics model are considered, e.g. inelastic material behavior and finite geometries. An open source python implementation of the proposed approach is available for use by those doing field and laboratory work involving digital image correlation and simulations, e.g. finite element, discrete element, molecular dynamics and peridynamics, where the crack tip position is not explicitly defined.</p></div>","PeriodicalId":590,"journal":{"name":"International Journal of Fracture","volume":"243 1","pages":"47 - 63"},"PeriodicalIF":2.5,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6551523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On crack nucleation and propagation in elastomers: I. In situ optical and X-ray experimental observations","authors":"Jinlong Guo,&nbsp;Krishnaswamy Ravi-Chandar","doi":"10.1007/s10704-023-00714-x","DOIUrl":"10.1007/s10704-023-00714-x","url":null,"abstract":"<div><p>This article presents the results of an investigation of crack nucleation and propagation in a transparent polydimenthylsiloxane (PDMS) elastomer. The main objective of the investigation is to characterize quantitatively the evolution of crack nucleation and propagation behavior not just through the usual macroscopic load and displacement data, but with synchronized optical images at high spatial and adequate temporal resolution that will resolve the evolution of the failure processes. This is augmented with X-ray computed tomography (CT) scans to characterize the three-dimensional geometry of the cracks nucleated in the interior of the elastomer. Towards this goal, we reproduce the classical <i>poker-chip</i> experiment of Gent and Lindley (Proc R Soc Lond A 249(1257):195–205, 1959) in which the specimen’s diameter-to-thickness ratio is varied over a broad range to cover crack nucleation, propagation, and their coalescence. These experiments are performed on transparent PDMS with different compositions, first in a specially built loading machine that is fitted with a high magnification microscopic camera that permits the measurement of the load while simultaneously providing images of the specimen configuration and subsequently in an apparatus built for in situ observations using an X-ray CT scanning system. These experiments reveal that nucleation of multiple microcracks dominates when the diameter-to-thickness aspect ratio <span>(alpha )</span> is sufficiently large, because the incompressibility of the material induces substantial, nearly uniform hydrostatic tension in the specimen. In contrast, specimens with smaller aspect ratio tend to nucleate fewer cracks, and are dominated by the growth of these cracks. At even smaller <span>(alpha )</span>, the hydrostatic stress is significantly lowered and failure is dominated by surface flaws. The three-dimensional geometry, and the spatial distribution of the nucleated cracks were evaluated using optical microscopy and X-ray CT scans. This revealed cracks of three different shapes, one of which was confined in a layer near to the upper or bottom boundary of the poker-chip, another was across the thickness, but with a tilt relative to the axis of the specimen, and the last was propagating along the radial direction.</p></div>","PeriodicalId":590,"journal":{"name":"International Journal of Fracture","volume":"243 1","pages":"1 - 29"},"PeriodicalIF":2.5,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10704-023-00714-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6551799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}