Fracture and Structural Integrity最新文献_第9页

Acoustic Emissions versus Pressure Stimulated Currents during bending of restored marble epistyles: Preliminary results 声发射与压力刺激电流在恢复大理石鼻窦弯曲期间:初步结果

Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.64

S. Kourkoulis, I. Dakanali, E. Pasiou, I. Stavrakas, D. Triantis

{"title":"Acoustic Emissions versus Pressure Stimulated Currents during bending of restored marble epistyles: Preliminary results","authors":"S. Kourkoulis, I. Dakanali, E. Pasiou, I. Stavrakas, D. Triantis","doi":"10.3221/IGF-ESIS.41.64","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.64","url":null,"abstract":"The efficiency of two modern sensing techniques, namely the “Acoustic Emissions” and the “Pressure Stimulated Currents” ones, when they are used as Continuous Structural Health Monitoring tools, is assessed experimentally. The protocol includes multi-point bending of an accurate copy of a fractured marble epistyle of the Parthenon’s Temple on the Acropolis of Athens, under a scale of 1:3. The integrity of the epistyle is restored with three pairs of bolted titanium bars, according to the pioneering technique developed by the scientists of the “Committee for the Conservation of the Acropolis Monuments”. The data provided by the above techniques are considered in juxtaposition to each other and also in comparison to data provided by the “Digital Image Correlation” technique. It is concluded that, at least from a qualitative point of view, the data of all three techniques are in good mutual agreement. Combined exploitation of the various sets of experimental data enlightens interesting aspects concerning the succession of failure mechanisms activated during the loading procedure, revealing the critical role of the internal interfaces characterizing the restored epistyle. Moreover it is definitely indicated that both the “Acoustic Emissions” and the “Pressure Stimulated Currents” techniques provide clear signs of upcoming failure well before macroscopically visible damages are detected at the external surface of the specimen.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"68 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":"130579056","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

Evaluation and visualization of multiaxial fatigue behavior under random non-proportional loading condition 随机非比例加载条件下多轴疲劳性能评价与可视化

Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.07

T. Morishita, Fumio Ogawa, Takamoto Itoh

{"title":"Evaluation and visualization of multiaxial fatigue behavior under random non-proportional loading condition","authors":"T. Morishita, Fumio Ogawa, Takamoto Itoh","doi":"10.3221/IGF-ESIS.41.07","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.07","url":null,"abstract":"In cyclic multiaxial stress/strain condition under nonproportional loading in which principal direction of stress/strain are changed in a cycle, it becomes difficult to analyze stress/strain ranges because of complexity of multiaxial stress/strain states depending on time in cycles. In order to evaluate stress/strain simply and suitably under non-proportional loading, Itoh and Sakane have proposed a method called as IS-method and a strain parameter for life evaluation under non-proportional loading ??NP. In the method, 6-components of stress/strain are converted to an equivalent stress/strain indicating the amplitude and the direction of principal stress/strain as a function of time as well as an intensity of loading nonproportionality fNP. Based on IS-method, the authors also have developed a tool which enables to analyze multiaxial stress/strain condition with the nonproportionality of loading history and evaluate failure life under nonproportional multiaxial loading. The tool indicates the analyzed results on monitor and users can understand visually not only variation of the stress/strain conditions but also non-proportionality during the cycle, which helps the design of material strength.","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":"133548910","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

Creep behavior of v-notched components v形缺口构件的蠕变行为

Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.57

P. Gallo, S. Razavi, M. Peron, J. Torgersen, F. Berto

引用次数: 9

Joined application of a multiaxial critical plane criterion and a strain energy density criterion in low-cycle fatigue 结合多轴临界平面准则和应变能密度准则在低周疲劳中的应用

Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.10

A. Carpinteri, G. Fortese, C. Ronchei, D. Scorza, S. Vantadori, F. Berto

{"title":"Joined application of a multiaxial critical plane criterion and a strain energy density criterion in low-cycle fatigue","authors":"A. Carpinteri, G. Fortese, C. Ronchei, D. Scorza, S. Vantadori, F. Berto","doi":"10.3221/IGF-ESIS.41.10","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.10","url":null,"abstract":"In the present paper, the multiaxial fatigue life assessment of notched structural components is performed by employing a strain-based multiaxial fatigue criterion. Such a criterion, depending on the critical plane concept, is extended by implementing the control volume concept reated to the Strain Energy Density (SED) approach: a material point located at a certain distance from the notch tip is assumed to be the verification point where to perform the above assessment. Such a distance, measured along the notch bisector, is a function of both the biaxiality ratio (defined as the ratio between the applied shear stress amplitude and the normal stress amplitude) and the control volume radii under Mode I and Mode III. Once the position of the verification point is determined, the fatigue lifetime is assessed through an equivalent strain amplitude, acting on the critical plane, together with a unique material reference curve (i.e. the Manson-Coffin curve). Some uniaxial and multiaxial fatigue data related to V-notched round bars made of titanium grade 5 alloy (Ti-6Al-4V) are examined to validate the present criterion.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"64 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":"127727311","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: 3

Influence of crack micro-roughness on the plasticity-induced fatigue propagation in high strength steel 裂纹微粗糙度对高强钢塑性疲劳扩展的影响

Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.09

J. Toribio, J. Matos, B. González

引用次数: 1

Stress Intensity Factor calculation from displacement fields 从位移场计算应力强度因子

Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.36

S. Beretta, L. Patriarca, S. Rabbolini

{"title":"Stress Intensity Factor calculation from displacement fields","authors":"S. Beretta, L. Patriarca, S. Rabbolini","doi":"10.3221/IGF-ESIS.41.36","DOIUrl":"https://doi.org/10.3221/IGF-ESIS.41.36","url":null,"abstract":"In the last two decades, visual image techniques such as Digital Image Correlation (DIC) enabled to experimentally determine the crack tip displacement and strain fields at small scales. The displacements are tracked during loading, and parameters as the Stress Intensity Factor (SIF), opening and closing loads, T-stress can be readily measured. In particular, the SIFs and the T-stress can be obtained by fitting the analytical equation of the Williamstype expansion with the experimentally-determined displacement fields. The results in terms of fracture mechanics parameters strictly depend on the dimension of the area considered around the crack tip in conjunction with the crack length, the maximum SIF (and thus the plastic tip radius), and the number of terms to be considered in the Williams-type expansion. This work focuses in understanding the accuracy of the SIF calculation based on these factors. The study is based on Finite Element Analysis simulations where purely elastic material behavior is considered. The accuracy of the estimation of the SIF is investigated and a guide-line is provided to properly set the DIC measurements. The analysis is then experimentally validated for crack closure measurements adopting the SENT specimen geometry.","PeriodicalId":300868,"journal":{"name":"Fracture and Structural Integrity","volume":"39 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":"131250280","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: 7

Analysis of longitudinal cracked two-dimensional functionally graded beams exhibiting material non-linearity 材料非线性的纵向裂纹二维功能梯度梁分析

Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.61

V. Ri̇zov

引用次数: 28

Gradient approach for the evaluation of the fatigue limit of welded structures under complex loading 复杂载荷下焊接结构疲劳极限评定的梯度法

Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.30

Y. Nadot, D. Halm, F. Coelho

引用次数: 0

Effect of hot dip galvanization on the fatigue strength of steel bolted connections 热浸镀锌对钢螺栓连接疲劳强度的影响

Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.54

S. Razavi, M. Peron, J. Torgersen, F. Berto, F. Mutignani

引用次数: 9

40CrMoV13.9 notched specimens under multiaxial fatigue: an overview of recent results 40CrMoV13.9缺口试件多轴疲劳研究综述

Fracture and Structural Integrity Pub Date : 2017-06-28 DOI: 10.3221/IGF-ESIS.41.55

S. Razavi, M. Peron, J. Torgersen, F. Berto, T. Welo

引用次数: 9