Strength Fracture and Complexity最新文献_第3页

Comparison of wrought and additively manufactured IN718 concerning crack growth threshold and fatigue crack growth behaviour 变形和增材制造IN718裂纹扩展阈值和疲劳裂纹扩展行为的比较

IF 0.7

Strength Fracture and Complexity Pub Date : 2022-05-03 DOI: 10.3233/sfc-228002

Timo Brune, K. M. Kraemer, C. Kontermann, M. Oechsner

{"title":"Comparison of wrought and additively manufactured IN718 concerning crack growth threshold and fatigue crack growth behaviour","authors":"Timo Brune, K. M. Kraemer, C. Kontermann, M. Oechsner","doi":"10.3233/sfc-228002","DOIUrl":"https://doi.org/10.3233/sfc-228002","url":null,"abstract":"Rotary components in turbine machinery such as gas turbine blades and discs or turbocharger wheels need to be designed so that high cycle fatigue (HCF) loads are well below the fatigue endurance limit to ensure safe operation. This requires an accurate measurement of the fatigue endurance limit and the related intrinsic fatigue crack growth (FCG) threshold. Furthermore, knowing the FCG threshold is crucial in order to assess the criticality of initial defects (e.g. cavities, carbide nests, etc.). In this study, the influence of the manufacturing route on the FCG threshold and the FCG behaviour at 650 °C in air of the nickel based superalloy IN718 is investigated. For this, a per Laser Powder Bed Fusion (LPBF) process manufactured version is compared to a conventionally wrought IN718 material state, both in the short and long crack regime. To measure crack growth increments of about 1 μm, an alternative pre-cracking and threshold test procedure is proposed for high temperature testing. To assess the behaviour of both material states in the short crack growth regime, cyclic R-curves have been generated taking the influence of two different R ratios into account. A further comparison of the FCG behaviour of the LPBF and the wrought material state is made on the basis of da/dN-ΔKI plots, with a focus on the Paris regime created from both classical FCG tests as well as continued threshold tests. The results observed are discussed in relation to the initial characterization of the two material states, which includes tensile tests at room temperature and at 650 °C as well as microstructural investigations.","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42203308","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

Conditional operation of boiler components working under creep conditions until replacement 锅炉部件在蠕变条件下的有条件运行，直至更换

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Strength Fracture and Complexity Pub Date : 2022-04-25 DOI: 10.3233/sfc-228007

J. Trzeszczyński, Ewa Trzeszczyńska

引用次数: 0

An anisotropic damage model combined with a tracking algorithm for modelling crack propagation 各向异性损伤模型与跟踪算法相结合用于模拟裂纹扩展

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Strength Fracture and Complexity Pub Date : 2022-02-18 DOI: 10.3233/sfc-210282

Wiseroad Yun, Kumchol Yun, Kukjin Kim

{"title":"An anisotropic damage model combined with a tracking algorithm for modelling crack propagation","authors":"Wiseroad Yun, Kumchol Yun, Kukjin Kim","doi":"10.3233/sfc-210282","DOIUrl":"https://doi.org/10.3233/sfc-210282","url":null,"abstract":"The development of a simple and efficient methodologies for numerically analyzing the material fracture process is very important in the field of computational mechanics. Damage mechanics approaches are still applied to fracture numerical analyses of many engineering practice problems. This paper focuses on the numerical prediction of crack propagation and fracture behavior by the combination of anisotropic damage model and tracking algorithm. In general, anisotropic damage models may be misunderstood to be used only in the simulations of anisotropic materials. However, it can be used for the anisotropic stiffness matrix induced by the crack plane in damaged isotropic materials. Although it is well known that the anisotropic damage model is superior to the isotropic damage model in fracture simulations, most of studies have combined the isotropic damage model and tracking algorithm, and few studies combine the anisotropic damage model and tracking algorithm. The issues of successfully combining the anisotropic damage model and crack tracking algorithm are addressed in this study. The anisotropic damage model is improved and a local tracking algorithm based on crack surface discretization is also modified. Various crack propagation problems are analyzed numerically to demonstrate the superior performance of the proposed approach.","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46748809","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

Isolation design and numerical calculation of isolated rubber bearing in continuous beam bridge in high seismic intensity area 高烈度地区连续梁桥隔震橡胶支座的隔震设计与数值计算

IF 0.7

Strength Fracture and Complexity Pub Date : 2021-12-06 DOI: 10.3233/sfc-210278

D. Pan, Tao Zhang

{"title":"Isolation design and numerical calculation of isolated rubber bearing in continuous beam bridge in high seismic intensity area","authors":"D. Pan, Tao Zhang","doi":"10.3233/sfc-210278","DOIUrl":"https://doi.org/10.3233/sfc-210278","url":null,"abstract":"The stability of bridges in the face of earthquake hazards has always been the focus of construction engineering. At present, a large number of bridge construction has begun to use isolation rubber bearings to increase the seismic capacity of bridges. However, in the face of high-intensity earthquake disasters, the seismic performance of the bridge is gradually unable to meet, the main reason is the lack of relevant research on the seismic performance of the bridge in high seismic intensity area. Therefore, this study will explore the changes of the bridge in the face of high-strength earthquake, and try to use high damping rubber bearings for the isolation design of the bridge. By establishing the finite element model of continuous bridge combined with isolation rubber bearing, the numerical calculation of bridge element is carried out on this basis, and the isolation effect of isolation rubber bearing is analyzed. The results show that the compression resistance and shear resistance of the isolated rubber bearing are strong. Under the influence of different seismic waves, the maximum displacement of the bearing is 0.131 m and the maximum horizontal force is 389.6 kN, which are lower than the allowable value of the bridge, and the overall seismic performance of the bridge has been significantly improved, which can play a good theoretical support in the construction of continuous bridges in high seismic intensity areas.","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45290243","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

Strip yield model for multiple straight cracks with coalesced yield zones: A theoretical study 具有联合屈服区的多条直裂纹的条带屈服模型的理论研究

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Strength Fracture and Complexity Pub Date : 2021-11-02 DOI: 10.3233/sfc-210276

S. Hasan, N. Akhtar, S. Shekhar

引用次数: 0

Research on seismic stability of reinforced concrete frame structure based on numerical simulation 基于数值模拟的钢筋混凝土框架结构地震稳定性研究

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Strength Fracture and Complexity Pub Date : 2021-10-20 DOI: 10.3233/sfc-210272

Jinchao Liu

引用次数: 0

New crack generation phenomena by crack collision in 10 mm thick tempered glass 10mm厚钢化玻璃裂纹碰撞产生新裂纹现象

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Strength Fracture and Complexity Pub Date : 2021-09-28 DOI: 10.3233/sfc-210280

S. Aratani

引用次数: 1

Riemann–Hilbert approach-based analytical solutions for strip saturated two unequal collinear cracks in piezoelectric media 基于Riemann-Hilbert方法的压电介质中带饱和两个不等共线裂纹的解析解

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Strength Fracture and Complexity Pub Date : 2021-04-27 DOI: 10.3233/SFC-200261

S. Singh, K. Sharma

{"title":"Riemann–Hilbert approach-based analytical solutions for strip saturated two unequal collinear cracks in piezoelectric media","authors":"S. Singh, K. Sharma","doi":"10.3233/SFC-200261","DOIUrl":"https://doi.org/10.3233/SFC-200261","url":null,"abstract":"The objective of the work is to derive analytical solutions based on the Riemann–Hilbert (R–H) approach for semipermeable strip saturated two unequal collinear cracks in arbitrary polarized piezoelectric media. We particularly consider the influence of far field electromechanical loadings, poling direction and different crack-face boundary conditions. The problem is mathematically formulated into a set of non-homogeneous R–H problems in terms of complex potential functions (related to field components) using complex variable and extended Stroh formalism approach. After solving these equations, explicit solutions are obtained for the involved unknown complex potential functions and hence, the stress and electric displacement components at any point within the domain. Furthermore, after employing standard limiting conditions, explicit expressions for some conventional fracture parameters such as saturated zone lengths (in terms of nonlinear equations), local stress intensity factors and crack opening displacement are obtained. Numerical studies are presented for the PZT-4H material to analyze the effects of prescribed electromechanical loadings, inter-cracks distance, crack-face conditions and poling direction on the defined fracture parameters.","PeriodicalId":41486,"journal":{"name":"Strength Fracture and Complexity","volume":"13 1","pages":"177-195"},"PeriodicalIF":0.7,"publicationDate":"2021-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/SFC-200261","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41552051","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

Some issues in creep-fatigue research 蠕变疲劳研究中的几个问题

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Strength Fracture and Complexity Pub Date : 2021-03-04 DOI: 10.3233/SFC-204004

I. Nonaka

引用次数: 0

Crack propagation and divergence phenomena observed by Caustics method in tempered glass 用焦散法观察钢化玻璃裂纹扩展和发散现象

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Strength Fracture and Complexity Pub Date : 2021-03-04 DOI: 10.3233/SFC-214005

S. Aratani

引用次数: 2