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Fracture and Structural Integrity最新文献

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The effect of residual stress on the nonsingular T-stresses 残余应力对非奇异t应力的影响
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.39
A. Chernyatin, Y. Matvienko, I. Razumovsky
{"title":"The effect of residual stress on the nonsingular T-stresses","authors":"A. Chernyatin, Y. Matvienko, I. Razumovsky","doi":"10.3221/IGF-ESIS.41.39","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.39","url":null,"abstract":"The effect of residual stresses on surface fatigue crack propagation and fracture mechanics parameters of intersecting orthogonal cracks is discussed. Mutual influence of intersecting cracks and biaxiality affects the nonsingular parameters Txx and Tzz. At the same time, the effect on the stress intensity factor is negligible. Two-parameter fracture mechanics is employed for an analysis of fatigue crack propagation taking into account residual stresses. The final configuration of the crack front is close to the semi-elliptical configuration.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"13 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":"133927409","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
The influence of crack tip shielding on fatigue crack propagation 裂纹尖端屏蔽对疲劳裂纹扩展的影响
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.41
A. Cernescu
{"title":"The influence of crack tip shielding on fatigue crack propagation","authors":"A. Cernescu","doi":"10.3221/IGF-ESIS.41.41","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.41","url":null,"abstract":"The fatigue crack propagation is one of the major problems and \u0000of the real concern in the evaluation of the structural integrity of components. \u0000This is due to the fact that once a fatigue crack has been detected it is also \u0000known its effect on the component; respectively it will cause failure at one \u0000time. In this situation, the problem is focused on determining the character of \u0000propagation of the crack so that it can be estimated and respectively delayed \u0000as possible the failure moment. The fatigue crack propagation character is \u0000determined by the stress state at the crack tip and the behavior of the material \u0000in which the crack is propagates. One of the phenomena with great influence \u0000on the fatigue crack propagation character is the crack tip stress shielding \u0000phenomena. In this paper the overloading effect is explained in terms of crack \u0000tip shielding mechanisms that guide the fatigue crack growth in plastic zone. \u0000The results indicate a change of fatigue crack propagation character once its \u0000tip enters into a plastic zone.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"15 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":"124962340","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
Notched graphite under multiaxial loading 多轴载荷下的缺口石墨
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.53
S. Razavi, M. Peron, J. Torgersen, F. Berto
{"title":"Notched graphite under multiaxial loading","authors":"S. Razavi, M. Peron, J. Torgersen, F. Berto","doi":"10.3221/IGF-ESIS.41.53","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.53","url":null,"abstract":"Cylindrical specimens made of polycrystalline graphite and weakened by circumferential V-notches under mixed mode I/III loading were studied in this research. Different geometries of V-notches varying the notch opening angle and the notch tip radius were tested. Appling various ratios of tensile and torsion loads, the multiaxial static tests have been conducted. Averaged Strain Energy Density (ASED) criterion previously presented by the same authors is employed here for the case of tension and torsion loadings applied in combination. The fracture behavior of the tested joints under multiaxial loading has been successfully predicted using the ASED criterion.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"21 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":"127380022","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: 8
Four-point bending test on a middle strength rock: numerical and experimental investigations 中等强度岩石四点弯曲试验:数值与实验研究
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.62
Aria Mardalizad, R. Scazzosi, A. Manes, M. Giglio
{"title":"Four-point bending test on a middle strength rock: numerical and experimental investigations","authors":"Aria Mardalizad, R. Scazzosi, A. Manes, M. Giglio","doi":"10.3221/IGF-ESIS.41.62","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.62","url":null,"abstract":"Developing a reliable numerical modelling technique is considered as challenge for fracture assessment of the geological materials, which are much subjected to hydrostatic pressure. For this purpose, the mechanical behaviour and the fracture pattern of a middle strength rock material, called Pietra Serena sandstone, is investigated both numerically and experimentally under a Four-Point Bending (also called Flexural) testing program. For the numerical approach, an innovative method, namely FEMcoupled to-SPH, is exploited due to its capabilities in dealing with rock mechanics related issues. Two different material models, which are the Karagozian and Case Concrete (KCC) and the Extended (Linear) Drucker- Prager, are exerted to assess their capabilities. The Flexural strength and the crack initiation area are studied based on the state of the stress in various parts of the specimen in both models, and finally the results obtained from the numerical models are compared with the data obtained from the experimental tests in order to assess the capability of the modelling approach.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"9 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":"127497713","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: 9
Experimental methodology for the quantification of crack tip plastic zone and shape from the analysis of displacement fields 基于位移场分析的裂纹尖端塑性区和形状量化的实验方法
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.23
J. Vasco‐Olmo, F. Díaz, M. James, C. Christopher, E. Patterson
{"title":"Experimental methodology for the quantification of crack tip plastic zone and shape from the analysis of displacement fields","authors":"J. Vasco‐Olmo, F. Díaz, M. James, C. Christopher, E. Patterson","doi":"10.3221/IGF-ESIS.41.23","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.23","url":null,"abstract":"The current work presents a novel methodology for the experimental quantification of the crack tip plastic zone during fatigue crack growth. This methodology is based on the application of yield criteria to estimate the area and the shape of the plastic zone at the crack tip. The implementation of the proposed methodology requires the use of strain maps calculated from the differentiation of the displacement fields obtained by digital image correlation (DIC). Stress maps can subsequently be inferred from both von Mises and Tresca yield criteria. Fatigue tests and associated measurements of plastic zone size and shape were conducted on a compacttension specimen made from commercially pure titanium at R ratio of 0.6. In addition, the ability to predict the shape and size of the experimentally observed crack tip plastic zone has been explored using three different analytical elastic crack tip models [Westergaard, Williams and Christopher- James-Patterson (CJP)]. This analysis indicated that the CJP model provided the most accurate prediction of the plastic zone and shape.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"416 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":"124175807","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: 5
Measurement and analysis of fatigue crack deformation at the micro-scale 微尺度下疲劳裂纹变形的测量与分析
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.27
D. Nowell, K. Dragnevski, S. J. O'connor
{"title":"Measurement and analysis of fatigue crack deformation at the micro-scale","authors":"D. Nowell, K. Dragnevski, S. J. O'connor","doi":"10.3221/IGF-ESIS.41.27","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.27","url":null,"abstract":"This paper introduces the use of digital image correlation for the measurement of surface displacements in the neighbourhood of a crack tip, both at the macro- and micro- scale. Various methods of interpreting the measured data and producing a crack driving force are then discussed, including the use of the full CJP model. A reduced set of parameters are then proposed, corresponding to the three principal interaction forces between the plastic enclave and the surrounding elastic material. Our own results, and those of Vasco Olmo, previously reported in the literature are then reanalysed using this new framework, and excellent agreement between two independent experiments is obtained. Implications for the analysis of further data sets are then discussed.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"25 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":"116955692","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: 0
Simple criterion for predicting fatigue life under combined bending and torsion loading 弯曲和扭转复合载荷下疲劳寿命预测的简单准则
Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.17
K. Slámečka, J. Pokluda
{"title":"Simple criterion for predicting fatigue life under combined bending and torsion loading","authors":"K. Slámečka, J. Pokluda","doi":"10.3221/IGF-ESIS.41.17","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.17","url":null,"abstract":"Multiaxial fatigue is a challenging problem and, consequently, a number of methods has been developed to aid in design of components and assemblies. Following the complexity of the problem, these approaches are often elaborate and it is difficult to use them for simple loading cases. In this paper, an empirical approach for constant amplitude, proportional axial and torsion loading is introduced to serve as a basic engineering tool for estimating fatigue life of rotational structural parts. The criterion relies on a quadratic equivalent-stress formula and requires one constant parameter to be determined from experiments. The comparison with similar classical stressbased approaches using data on diverse materials (several steels, aluminium alloy, and nickel base superalloy) reveals very good agreement with experimental data.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"104 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":"125844405","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
Strain monitoring of cement-based materials with embedded polyvinyl alcohol - carbon nanotube (PVA-CNT) fibers 嵌入聚乙烯醇-碳纳米管(PVA-CNT)纤维的水泥基材料应变监测
Fracture and Structural Integrity Pub Date : 2017-04-03 DOI: 10.3221/IGF-ESIS.40.06
Z. Metaxa, W. Neri, P. Poulin, N. Alexopoulos
{"title":"Strain monitoring of cement-based materials with embedded polyvinyl alcohol - carbon nanotube (PVA-CNT) fibers","authors":"Z. Metaxa, W. Neri, P. Poulin, N. Alexopoulos","doi":"10.3221/IGF-ESIS.40.06","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.40.06","url":null,"abstract":"This article investigates the possibility of exploiting innovative polyvinyl alcohol fibers reinforced with carbon nanotubes (PVA-CNT fiber) as a strain sensor in cement mortars used in the restoration of Cultural Heritage Monuments. Two types of PVA-CNT fibers were embedded in the matrix at a short distance from the bottom of the beam and their readings were correlated with traditional sensors, e.g. strain gauges and Fiber Optic Bragg Gratings. The Electrical Resistance Change (ERC) of the embedded PVACNT fiber was in-situ monitored during four-point bending mechanical tests. For the case of coated PVA-CNT fiber, a linear correlation of the applied strain at the bottom surface of the specimen along with ERC values of the fiber was noticed for the low strain regime. For the case of incremental increasing loading – unloading loops, the coated and annealed PVA-CNT fiber gave the best results either as embedded or as ‘surface attached’ sensor that exhibited linear correlation of ERC with applied strain for the low applied strain regime as well as hysteresis loops during unloading. The article discusses their high potential to be exploited as strain/damage sensor in applications of civil engineering as well as in restoration of Monuments of Cultural Heritage.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"62 20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116560327","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 thermography-based method for fatigue behavior evaluation of coupling beam damper 基于热成像的耦合梁阻尼器疲劳性能评价方法
Fracture and Structural Integrity Pub Date : 2017-04-03 DOI: 10.3221/IGF-ESIS.40.13
Zhe Zhang, J. Ou, Dongsheng Li, Shuaifang Zhang, J. Fan
{"title":"A thermography-based method for fatigue behavior evaluation of coupling beam damper","authors":"Zhe Zhang, J. Ou, Dongsheng Li, Shuaifang Zhang, J. Fan","doi":"10.3221/IGF-ESIS.40.13","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.40.13","url":null,"abstract":"Under cyclic load, local fatigue damage will occur in the metal damper widely used in the shear wall. This will deteriorate the stiffness of damper and weaken the hysteresis behaviour. The present paper proposed a new and easy method to manufacture kinds of coupling beam dampers. A thermography-based experiment was used to study the energy dissipation and damage accumulation during fatigue process of the metal damper. Based on the temperature variation related to fatigue damage process, the relationship between the plastic deformation and thermal energy dissipation was quantitatively established. Besides, the relationships between the temperature increase to damage accumulation and mechanical load were analyzed systematically.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124735783","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: 11
Structural interventions on the drums of the Parthenon’s north colonnade 帕台农神庙北柱廊鼓上的结构干预
Fracture and Structural Integrity Pub Date : 2017-04-03 DOI: 10.3221/IGF-ESIS.40.09
M. Mentzini
{"title":"Structural interventions on the drums of the Parthenon’s north colonnade","authors":"M. Mentzini","doi":"10.3221/IGF-ESIS.40.09","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.40.09","url":null,"abstract":"The Acropolis monuments are globally recognized as a cultural heritage and a value belonging not only to Greece but also to Humanity. From 2000 the most recent phase of restoration in their history began by the “Acropolis Restoration Service” (YSMA), introducing new, pioneering methods, recognized now worldwide. Especially the restoration of the Parthenon’s North Colonnade is an enormous work-plan to be carried out (extended area of intervention, great number of members to be restored and high degree of damages). Moreover, the structural stability of the Parthenon’s north colonnade is among the most important challenges confronted by experts working in this sector. The complexity of this effort (a combination of scientific research and direct field application) makes the implementation of the restoration project difficult, rendering its division into smaller projects (for similar structural members) a necessity. In this direction, characteristic examples of the procedure followed for the structural intervention on the drums are presented in this paper. Each member’s report includes a short history of its restoration, the intervention steps, pictures/sketches and the methodology chosen for its structural study, focusing on the particularities of the member and the in-field realization.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125001952","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
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