Engineering Transactions最新文献_第7页

Multi-Scale Numerical Analysis of the Effect of Microstructural Features on the Mechanical Behavior of Polycrystalline Ti-6Al-4V Alloy 显微组织特征对多晶Ti-6Al-4V合金力学行为影响的多尺度数值分析

Engineering Transactions Pub Date : 2019-06-28 DOI: 10.24423/ENGTRANS.1014.20190615

F. Benmessaoud, V. Velay, M. Cheikh, V. Vidal, C. Boher, F. Rezai-Aria

{"title":"Multi-Scale Numerical Analysis of the Effect of Microstructural Features on the Mechanical Behavior of Polycrystalline Ti-6Al-4V Alloy","authors":"F. Benmessaoud, V. Velay, M. Cheikh, V. Vidal, C. Boher, F. Rezai-Aria","doi":"10.24423/ENGTRANS.1014.20190615","DOIUrl":"https://doi.org/10.24423/ENGTRANS.1014.20190615","url":null,"abstract":"The present work aims to model the influence of microstructural features of Ti-6Al-4V titanium alloy on its mechanical behavior. A multi-scale approach based on crystal plasticity is considered. The elasto-viscoplastic constitutive equations of Meric-Cailletaud are modified to take into consideration the effect of the grain size by introducing the Hall-Petch relationship at the local scale. This modified model is coupled with finite element calculations under small strain assumption to simulate the monotonic mechanical behavior of Ti-6A-4V at local and global scales. It is shown that the mechanical behavior of Ti-6Al-4V is drastically dependent upon the material features. Strong crystallographic texture can result in the formation \u0000of hardened and less hardened areas. Moreover, by increasing the grain size scattering, the heterogeneously deformed areas are multiplied. By decreasing the average grain size, the yield strength increases. It is observed that the effects of grain size, grain size scattering and crystallographic texture are coupled.","PeriodicalId":38552,"journal":{"name":"Engineering Transactions","volume":"67 1","pages":"227-242"},"PeriodicalIF":0.0,"publicationDate":"2019-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45775886","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

Vibrations of a Double-Beam System with Intermediate Elastic Restraints Due to a Moving Force 具有中间弹性约束的双梁系统在运动力作用下的振动

Engineering Transactions Pub Date : 2019-05-30 DOI: 10.24423/ENGTRANS.1010.20190530

F. Zakęś, P. Sniady

引用次数: 1

Performance Evaluation and Frequency Response Analysis of a Two Stage Two Spool Electrohydraulic Servovalve with a Linearized Model 二级二阀芯电液伺服阀线性化模型的性能评价和频率响应分析

Engineering Transactions Pub Date : 2019-05-09 DOI: 10.24423/ENGTRANS.945.20190509

N. Mondal, B. Datta

引用次数: 0

Research on Influence of TiSi(N) Reflective Coating Thermal Resistance on Energy Absorption of Fireproof Textile Coupled with Auxetic Fabric TiSi(N)反射涂层耐热性对复合阻燃织物吸能影响的研究

Engineering Transactions Pub Date : 2019-05-09 DOI: 10.24423/ENGTRANS.1003.20190509

D. Miedzińska, M. Stankiewicz, R. Gieleta, K. Marszałek

引用次数: 1

Bending of Beams with Symmetrically Varying Mechanical Properties Under Generalized Load – Shear effect 力学性能对称变化梁在广义荷载-剪切作用下的弯曲

Engineering Transactions Pub Date : 2019-05-09 DOI: 10.24423/ENGTRANS.987.20190509

K. Magnucki, J. Lewiński

引用次数: 7

Response Surfaces in the Numerical Homogenization of Non-Linear Porous Materials 非线性多孔材料数值均匀化中的响应面

Engineering Transactions Pub Date : 2019-05-02 DOI: 10.24423/ENGTRANS.1012.20190502

W. Beluch, Marcin Hatłas

引用次数: 1

Investigation of Monotonic and Cyclic Behavior of Soft Clay Using Direct Simple Shear Apparatus 用直剪仪研究软粘土的单调和循环特性

Engineering Transactions Pub Date : 2019-04-26 DOI: 10.24423/ENGTRANS.939.20190426

Sutera Benchanukrom, Chitsirin Lailak, N. Konkong

{"title":"Investigation of Monotonic and Cyclic Behavior of Soft Clay Using Direct Simple Shear Apparatus","authors":"Sutera Benchanukrom, Chitsirin Lailak, N. Konkong","doi":"10.24423/ENGTRANS.939.20190426","DOIUrl":"https://doi.org/10.24423/ENGTRANS.939.20190426","url":null,"abstract":"The purpose of this research was to study the monotonic and cyclic simple shear mode behavior of Bangkok clay, using direct simple shear apparatus. The monotonic specimens were prepared in a saturated condition and were K0 consolidated before being undrained sheared. The specimens were sheared at the shear strain rate of 5% per hour until the shear strain reached 20%. The Stress History and Normalized Soil Engineering Properties (SHANSEP) method was applied to analyze the monotonic test data, and the CK0DSS SHANSEP equation was proposed, based on the results. The results from the CK0DSS SHANSEP equation were in a good correlation with Qu, CK0CU and CK0EU. The cyclic specimens were tested at different frequencies of 0.1, 1 and 5 Hz and the vertical stress was varied at 200, 300, and 400 kPa. The shear strain amplitude was controlled at ±0.5% for the first 100 cycles, and then was increased to ±1.5% for the next 100 cycles, and finally it was increased to ±3% for the last 100 cycles. The results showed that the shear modulus increased when the maximum vertical effective stress increased and the damping ratio increased when the strain amplitude increased.","PeriodicalId":38552,"journal":{"name":"Engineering Transactions","volume":"67 1","pages":"369-386"},"PeriodicalIF":0.0,"publicationDate":"2019-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47850198","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

The Effect of Strength Differential on Material Effort and Lifetime of Steam Turbine Rotors Under Thermo-Mechanical Load 热机械负荷下强度差对汽轮机转子材料强度和寿命的影响

Engineering Transactions Pub Date : 2019-04-26 DOI: 10.24423/ENGTRANS.964.20190426

M. Banaszkiewicz, W. Dudda, J. Badur

引用次数: 10

Investigation of free vibration and buckling of Timoshenko nano-beam based on a general form of eringen theory using conformable fractional derivative and Galerkin method 基于广义eringen理论的Timoshenko纳米梁自由振动和屈曲的保形分数导数和Galerkin方法研究

Engineering Transactions Pub Date : 2019-04-26 DOI: 10.24423/ENGTRANS.1001.20190426

F. Mohammadi, Z. Rahimi, W. Sumelka, Xiao-jun Yang

{"title":"Investigation of free vibration and buckling of Timoshenko nano-beam based on a general form of eringen theory using conformable fractional derivative and Galerkin method","authors":"F. Mohammadi, Z. Rahimi, W. Sumelka, Xiao-jun Yang","doi":"10.24423/ENGTRANS.1001.20190426","DOIUrl":"https://doi.org/10.24423/ENGTRANS.1001.20190426","url":null,"abstract":"The purpose of this paper is to study the free vibration and buckling of a Timoshenko \u0000nano-beam using the general form of the Eringen theory generalized based on the fractional derivatives. \u0000 \u0000In this paper, using the conformable fractional derivative (CFD) definition the generalized form of the Eringen nonlocal theory (ENT) is used to consider the effects of integer and noninteger stress gradients in the constitutive relation and also to consider small-scale effect in the vibration of a Timoshenko nano-beam. The governing equation is solved by the Galerkin method. \u0000 \u0000Free vibration and buckling of a Timoshenko simply supported (S) nano-beam is investigated, and the influence of the fractional and nonlocal parameters is shown on the frequency ratio and buckling ratio. In this sense, the obtained formulation allows for an easier mapping of experimental results on nano-beams. \u0000 \u0000The new theory (fractional parameter) makes the modeling more flexible. The model can conclude all of the integer and non-integer operators and is not limited to the special operators such as ENT. In other words, it allows to use more sophisticated/flexible mathematics to model physical phenomena.","PeriodicalId":38552,"journal":{"name":"Engineering Transactions","volume":"67 1","pages":"347-367"},"PeriodicalIF":0.0,"publicationDate":"2019-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48106275","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: 6

The Influence of High-Strength Bolts Stiffening on Flange Connection Behaviour 高强度螺栓加劲对法兰连接性能的影响

Engineering Transactions Pub Date : 2019-04-05 DOI: 10.24423/ENGTRANS.1006.20190405

I. Major, M. Major, K. Kuliński

引用次数: 1