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Fracture and Structural Integrity最新文献

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Influence of the stress gradient on the fatigue life calculation of a martensitic high strength steel 应力梯度对马氏体高强钢疲劳寿命计算的影响
Fracture and Structural Integrity Pub Date : 2017-09-29 DOI: 10.3221/IGF-ESIS.42.01
Igor Milošević, G. Winter, F. Grün, M. Kober
{"title":"Influence of the stress gradient on the fatigue life calculation of a martensitic high strength steel","authors":"Igor Milošević, G. Winter, F. Grün, M. Kober","doi":"10.3221/IGF-ESIS.42.01","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.42.01","url":null,"abstract":"Nowadays lifetime calculation in the high cycle fatigue region is commonly based on S/N curves which are modified by different influences to ensure accurate results. Especially the application of these models is important when small components with complex stress distributions are used. The influence of the stress distribution was considered by the stress gradient approach which is implemented in the lifetime tool FEMFAT. Specimens with diameters of D4mm and D7.5mm were used to examine the effect of the calculation modified by the stress gradient. On the one hand regarding different types of this approach it can be shown that the results fit very well compared to the testing results but on the other hand a big difference was observed when the gradient increases by smaller specimen sizes.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127259464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Investigation on some factors affecting crack formation in high resistance aluminum alloys 高阻铝合金裂纹形成影响因素的研究
Fracture and Structural Integrity Pub Date : 2017-09-29 DOI: 10.3221/IGF-ESIS.42.29
A. Brotzu, F. Felli, D. Pilone
{"title":"Investigation on some factors affecting crack formation in high resistance aluminum alloys","authors":"A. Brotzu, F. Felli, D. Pilone","doi":"10.3221/IGF-ESIS.42.29","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.42.29","url":null,"abstract":"Aluminum alloys having good mechanical properties are Al-Zn- Mg alloys (7xxx) and Al-Cu-Li alloys (Weldalite®). These alloys may be subjected to stress corrosion cracking. In order to overcome this problem the Al 7050 alloy has been developed and it is widely used for aerospace applications. Despite that, some components made of this alloy cracked during the manufacturing process including machining and chemical anodization. In a previous work cracked Al 7050 components have been analyzed in order to identify possible causes of crack formation. In this work the susceptibility of this alloy to intergranular corrosion has been analysed and compared with that of other high resistance aluminum alloys.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133695039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A two-step multiaxial racetrack filter algorithm for non-proportional load histories 非比例负荷历史的两步多轴赛道滤波算法
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.01
M. Meggiolaro, J. Castro, Hao Wu
{"title":"A two-step multiaxial racetrack filter algorithm for non-proportional load histories","authors":"M. Meggiolaro, J. Castro, Hao Wu","doi":"10.3221/IGF-ESIS.41.01","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.01","url":null,"abstract":"The recently proposed multiaxial racetrack filter (MRF) is able to deal with general non-proportional multiaxial load histories. While only requiring a single user-defined scalar filter amplitude, the MRF is able to synchronously eliminate non-damaging events from any noisy multiaxial load history without changing the overall shape of its original path, a necessary condition to avoid introducing errors in fatigue damage assessments. The MRF procedures are optimized here by the introduction of a pre-processing “partitioning” step on the load history data, which selects candidates for the reversal points in a robust partitioning process, highly increasing the filter efficiency and decreasing its computational time. The improved MRF is evaluated through the fatigue analyses of over-sampled tension-torsion data measured in 316L stainless steel tubular specimens under non-proportional load paths.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126334728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Dynamic debonding in layered structures: a coupled ALE-cohesive approach 层状结构中的动态脱粘:一种耦合ale -内聚方法
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.63
M. F. Funari, F. Greco, P. Lonetti
{"title":"Dynamic debonding in layered structures: a coupled ALE-cohesive approach","authors":"M. F. Funari, F. Greco, P. Lonetti","doi":"10.3221/IGF-ESIS.41.63","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.63","url":null,"abstract":"A computational formulation able to simulate crack initiation and growth in layered structural systems is proposed. In order to identify the position of the onset interfacial defects and their dynamic debonding mechanisms, a moving mesh strategy, based on Arbitrary Lagrangian-Eulerian (ALE) approach, is combined with a cohesive interface methodology, in which weak based moving connections are implemented by using a finite element formulation. The numerical formulation has been implemented by means of separate steps, concerned, at first, to identify the correct position of the crack onset and, subsequently, the growth by changing the computational geometry of the interfaces. In order to verify the accuracy and to validate the proposed methodology, comparisons with experimental and numerical results are developed. In particular, results, in terms of location and speed of the debonding front, obtained by the proposed model, are compared with the ones arising from the literature. Moreover, a parametric study in terms of geometrical characteristics of the layered structure are developed. The investigation reveals the impact of the stiffening of the reinforced strip and of adhesive thickness on the dynamic debonding mechanisms.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"1059 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132086498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Dependence of mechanical characteristics from composition and structure and optimization of mechanical fracture energy of polymer composite material based on high-molecular rubbers 高分子橡胶基高分子复合材料力学性能与组成结构的关系及力学断裂能的优化
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.48
E. Nurullaev, A. Ermilov, N. Y. Lyubimova
{"title":"Dependence of mechanical characteristics from composition and structure and optimization of mechanical fracture energy of polymer composite material based on high-molecular rubbers","authors":"E. Nurullaev, A. Ermilov, N. Y. Lyubimova","doi":"10.3221/IGF-ESIS.41.48","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.48","url":null,"abstract":"By means of numerical experiment the authors investigate dependence of conventional rupturing stress and mechanical fracture energy at uniaxial tension from fractional composition of dispersed filler, plasticizer volume fraction in polymer binder, effective density of transverse bonds, applied to development of covering for different purposes and with advanced service life in temperature range from 223 to 323 K. They compare mechanical characteristics of polymer composite materials (PCMs) based on high- and low-molecular rubbers. It was shown that rupturing stress of high-molecular rubber-based PCM is of a higher magnitude than the stress of low-molecular rubber-based one at almost invariable rupturing deformation. Numerical simulation by variation of composition parameters and molecular structure enables evaluation of its maximum fracture energy which is 1000 times higher than mechanical fracture energy of similar composites based on low-molecular rubbers.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"132 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133264098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Research on differences and correlation between tensile, compression and flexural moduli of cement stabilized macadam 水泥稳定碎石抗拉、抗压、抗弯模量的差异及相关性研究
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.45
Yi Yang, Jian-long Zheng, Songtao Lu
{"title":"Research on differences and correlation between tensile, compression and flexural moduli of cement stabilized macadam","authors":"Yi Yang, Jian-long Zheng, Songtao Lu","doi":"10.3221/IGF-ESIS.41.45","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.45","url":null,"abstract":"In order to reveal the differences and conversion relations between the tensile, compressive and flexural moduli of cement stabilized macadam, in this paper, we develop a new test method for measuring three moduli simultaneously. By using the materials testing system, we test three moduli of the cement stabilized macadam under different loading rates, propose a flexural modulus calculation formula which considers the shearing effect, reveal the change rules of the tensile, compression and flexural moduli with the loading rate and establish the conversion relationships between the three moduli. The results indicate that: three moduli become larger with the increase of the loading rate, showing a power function pattern; with the shear effect considered, the flexural modulus is increased by 47% approximately over that in the current test method; the tensile and compression moduli of cement stabilized macadam are significantly different. Therefore, if only the compression modulus is used as the structural design parameter of asphalt pavement, there will be a great deviation in the analysis of the load response. In order to achieve scientific design and calculation, the appropriate design parameters should be chosen based on the actual stress state at each point inside the pavement structure.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115351559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Fracture toughness investigations of Al6061-Graphite particulate composite using compact specimens 用致密试样研究al6061 -石墨颗粒复合材料断裂韧性
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.60
S. Doddamani, M. Kaleemulla
{"title":"Fracture toughness investigations of Al6061-Graphite particulate composite using compact specimens","authors":"S. Doddamani, M. Kaleemulla","doi":"10.3221/IGF-ESIS.41.60","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.60","url":null,"abstract":"The objective of this research work is to study the fracture behavior of Al6061 with graphite particulate composite produced by the stir casting technique. For the study different composition of the particulate metal matrix composite used is Al6061 with 3, 6, 9, & 12% of graphite particles. Compact Tension (CT) specimens were utilized to determine fracture toughness for different compositions of Al6061-graphite particulate metal matrix composite. Specimens with different composition will be prepared for different crack length to width (a/w) ratios according to the ASTM E-399 standard testing procedure. The maximum fracture toughness was found for Al6061-9%Gr for a/w =0.45 and the value is 16.74 MPa ?m.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114502643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 20
Prediction of fatigue crack initiation under biaxial loading 双轴载荷下疲劳裂纹萌生的预测
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.15
J. Sahadi, D. Nowell, R. Paynter
{"title":"Prediction of fatigue crack initiation under biaxial loading","authors":"J. Sahadi, D. Nowell, R. Paynter","doi":"10.3221/IGF-ESIS.41.15","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.15","url":null,"abstract":"This investigation revisits biaxial fatigue experiments carried out with the nickel-based superalloy termed Waspaloy. Recently, yield criteria extended to multiaxial fatigue and stress based approaches were analysed and their performance to correlate the biaxial test data was evaluated. It was concluded that despite their reliable results, the parameters did not properly represent the physical behaviour of the material. In this context, an extension of this study was executed considering the strain based critical plane approaches proposed by Fatemi-Socie (FS) and Smith- Watson-Topper (SWT). The first parameter presented overly conservative predictions with large scatter of results. In contrast, more accurate predictions were obtained with the SWT parameter.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124468236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
On short cracks that depart from elastoplastic notch tips 在脱离弹塑性缺口尖端的短裂纹上
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.32
Verônica Miquelin Machado, J. Castro, M. Meggiolaro
{"title":"On short cracks that depart from elastoplastic notch tips","authors":"Verônica Miquelin Machado, J. Castro, M. Meggiolaro","doi":"10.3221/IGF-ESIS.41.32","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.32","url":null,"abstract":"The behavior of short cracks that depart from elastoplastic notch tips is modeled to estimate the stresses required to initiate and to propagate cracks in notched structural components, and to evaluate the size of tolerable crack-like defects under general loading conditions. This analysis can model both fatigue and environmentally assisted cracking problems; can evaluate notch sensitivity in both cases; and can as well be used to establish design or acceptance criteria for tolerable non-propagating crack-like defects in such cases. The growth of short cracks is assumed driven by the applied stresses and by the stress gradient ahead the notch tip, and supported by the material resistances to crack initiation and to long crack propagation by fatigue or EAC. In the elastoplastic case, the stress gradient ahead of the notch tip is quantified by a J-field to consider the short crack behavior. The tolerable short crack predictions made by this model are evaluated by suitable fatigue and EAC tests of notched specimens specially designed to start nonpropagating cracks from the notch tips, both under elastic and elastoplastic conditions.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125491716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Williams expansion-based approximation of the stress field in an Al 2024 body with a crack from optical measurements 光学测量中带有裂纹的Al 2024物体应力场的Williams扩展近似
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.43
S. Seitl, L. Malíková, J. Sobek, P. Frantik, P. Lopez‐Crespo
{"title":"Williams expansion-based approximation of the stress field in an Al 2024 body with a crack from optical measurements","authors":"S. Seitl, L. Malíková, J. Sobek, P. Frantik, P. Lopez‐Crespo","doi":"10.3221/IGF-ESIS.41.43","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.43","url":null,"abstract":"A study on the approximation of the stress field in the vicinity of crack tip in a compact tension specimen made from Al 2024-T351 is presented. Crack tip stress tensor components are expressed using the linear elastic fracture mechanics (LEFM) theory in this work, more precisely via its multi-parameter formulation, i.e. by Williams power series (WPS). Determination of coefficients of terms of this series is performed using a least squares-based regression technique known as over deterministic method (ODM) for which displacements data obtained experimentally via optical measurements are taken as inputs. The stress fields reconstructed based on the displacement data obtained experimentally by means of optical measurements are verified by means of the stress field approximations derived for the normalized CT specimen via hybrid elements.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"209 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115272583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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