力学国际期刊(英文)最新文献_第3页

Fracture Mechanics on Aluminum Specimens 铝试样的断裂力学

力学国际期刊(英文) Pub Date : 2021-01-01 DOI: 10.4236/wjm.2021.1112016

Juan Jose Mejia Briseno, Francisco Casanova-del-Angel

引用次数: 2

On the Orientation of Fractures with Transpressional and Transtensional Wrenches in Pre-Existing Faults 预存断层中具有压扭和张扭的裂缝走向

力学国际期刊(英文) Pub Date : 2020-11-10 DOI: 10.4236/wjm.2020.1011014

Shuping Chen

{"title":"On the Orientation of Fractures with Transpressional and Transtensional Wrenches in Pre-Existing Faults","authors":"Shuping Chen","doi":"10.4236/wjm.2020.1011014","DOIUrl":"https://doi.org/10.4236/wjm.2020.1011014","url":null,"abstract":"The orientation of fractures with transpressional and transtensional wrenches in pre-existing faults has not been quantitatively determined. Based on Coulomb failure criterion and Byerlee’s frictional sliding criterion, this paper has indicated quantitative geometric relationships between the pre-existing fault and the local induced principal stress axes caused by the rejuvenation of the pre-existing fault. For a hidden pre-existing fault with some cohesion, the angles between the local induced principal stress axes and the pre-existing fault quantitatively vary with the applied stress and the cohesion coefficient, the ratio of the thickness of the cover layer to the thickness of the whole wrench body, whether transpressional or transtensional wrenches occur. For a surface pre-existing fault with zero cohesion, the angles between the pre-existing fault and the local induced principal stress axes are related to the rock inner frictional angle regardless of both the applied stress and the cohesion coefficient where transpressional wrenches occur, and the local induced maximum principal stress axis is identical with the applied maximum principal stress axis where transtensional wrenches occur. Therefore, the geometric relationships between the pre-existing faults and their related fractures are defined, because the local induced principal stress axes determine the directions of the related fractures. The results can be applied to pre-existing weak fabrics. They can help to understand and analyze wrench structures in outcrops or subsurface areas. They are of significance in petroleum exploration.","PeriodicalId":70106,"journal":{"name":"力学国际期刊(英文)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43818087","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

Maximum Interval of Stability and Convergence of Solution of a Forced Mathieu’s Equation 一类强迫Mathieu方程解的稳定性和收敛性的最大区间

力学国际期刊(英文) Pub Date : 2020-11-10 DOI: 10.4236/wjm.2020.1011015

E. Eze, U. E. Obasi, R. N. Ujumadu, Grace Ihuoma Kalu

引用次数: 0

Collisions in Classical Mechanics in Terms of Mass-Momentum “Vectors” with Galilean Transformations 经典力学中质量-动量“矢量”与伽利略变换的碰撞

力学国际期刊(英文) Pub Date : 2020-10-12 DOI: 10.4236/wjm.2020.1010011

A. Ogura

引用次数: 1

A Simple Theory of Asymmetric Linear Elasticity 非对称线性弹性的一个简单理论

力学国际期刊(英文) Pub Date : 2020-09-22 DOI: 10.4236/wjm.2020.1010012

Ze-hua Qiu

{"title":"A Simple Theory of Asymmetric Linear Elasticity","authors":"Ze-hua Qiu","doi":"10.4236/wjm.2020.1010012","DOIUrl":"https://doi.org/10.4236/wjm.2020.1010012","url":null,"abstract":"Rotation is antisymmetric and therefore is not a coherent element of the classical elastic theory, which is characterized by symmetry. A new theory of linear elasticity is developed from the concept of asymmetric strain, which is defined as the transpose of the deformation gradient tensor to involve rotation as well as symmetric strain. The new theory basically differs from the prevailing micropolar theory or couple stress theory in that it maintains the same basis as the classical theory of linear elasticity and does not need extra concepts, such as “microrotation” and “couple stresses”. The constitutive relation of the new theory, the three-parameter Hooke’s law, comes from the theorem about isotropic asymmetric linear elastic materials. Concise differential equations of translational motion are derived consequently giving the same velocity formula for P-wave and a different one for S-wave. Differential equations of rotational motion are derived with the introduction of spin, which has an intrinsic connection with rotation. According to the new theory, S-wave essentially has rotation as large as deviatoric strain and should be referred to as “shear wave” in the context of asymmetric strain. There are nine partial differential equations for the deformation harmony condition in the new theory; these are given with the first spatial differentiations of asymmetric strain. Formulas for rotation energy, in addition to those for (symmetric) strain energy, are derived to form a complete set of formulas for the total mechanical energy.","PeriodicalId":70106,"journal":{"name":"力学国际期刊(英文)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48220665","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: 4

Two Problems of Time Entering Respectively the Relativistic Mechanics and Electron Transport in Quantum Theory 时间分别进入的两个问题——量子理论中的相对论力学和电子输运

力学国际期刊(英文) Pub Date : 2020-09-22 DOI: 10.4236/wjm.2020.1010013

S. Olszewski

引用次数: 0

γ-Ray Irradiation Effect on MCF Rubber Solar Cells with both Photovoltaics and Sensing Involving Semiconductors Fabricated under Magnetic and Electric Fields 磁场和电场下制备的MCF橡胶太阳能电池的γ射线辐照效应

力学国际期刊(英文) Pub Date : 2020-08-31 DOI: 10.4236/wjm.2020.108008

K. Shimada, Ryo Kato, Ryo Ikeda, H. Kikura, H. Takahashi

{"title":"γ-Ray Irradiation Effect on MCF Rubber Solar Cells with both Photovoltaics and Sensing Involving Semiconductors Fabricated under Magnetic and Electric Fields","authors":"K. Shimada, Ryo Kato, Ryo Ikeda, H. Kikura, H. Takahashi","doi":"10.4236/wjm.2020.108008","DOIUrl":"https://doi.org/10.4236/wjm.2020.108008","url":null,"abstract":"For cases in which a robot with installed solar cells and a sensor operates in a nuclear reactor building or in space for extravehicular activity, we require elastic and extensible solar cells. More than two different types of sensing are also required, minimally with photovoltaics and built-in electricity. Magnetic compound fluid (MCF) rubber solar cells are made of rubber, so they are elastic and extensible as well as sensitive. To achieve flexibility and an effective photovoltaic effect, MCF rubber solar cells must include both soluble and insoluble rubbers, Fe3O4, TiO2, Na2WO4∙2H2O, etc. On the basis of this constitution, we propose a consummate fabrication process for MCF rubber solar cells. The characteristics of these cells result from the semiconductor-like role of the molecules of TiO2, Fe3O4, Ni, Na2WO4∙2H2O, polydimethylsiloxane (PDMS), natural rubber (NR), oleic acid, polyvinyl alcohol (PVA), water and magnetic cluster involved in the MCF rubber. Their tendencies can be deduced by synthesizing knowledge about the enhancement of the reverse-bias saturation current IS and the diode ideality factor N, with conventional knowledge about the semiconductor affected by γ-irradiation and the attenuation of the photon energy of γ-rays.","PeriodicalId":70106,"journal":{"name":"力学国际期刊(英文)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42006403","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

Star Formation in Self-Gravitating Molecular Cloud: The Critical Mass and the Core Accretion Rate 自引力分子云中的恒星形成:临界质量和核心吸积率

力学国际期刊(英文) Pub Date : 2020-05-29 DOI: 10.4236/wjm.2020.105005

G. M. Kumssa, S. B. Tessema

引用次数: 1

Residual Stress Consideration in Fatigue Damage of Offshore Wind Turbine Monopiles: To Be or Not to Be? 海上风电单桩疲劳损伤的残余应力考虑:是还是不是?

力学国际期刊(英文) Pub Date : 2020-04-22 DOI: 10.4236/wjm.2020.104004

A. A. Oyeniran, D. S. Aziaka

{"title":"Residual Stress Consideration in Fatigue Damage of Offshore Wind Turbine Monopiles: To Be or Not to Be?","authors":"A. A. Oyeniran, D. S. Aziaka","doi":"10.4236/wjm.2020.104004","DOIUrl":"https://doi.org/10.4236/wjm.2020.104004","url":null,"abstract":"The purpose of this paper was to investigate the impact of residual stresses on fatigue damage of offshore wind turbine monopiles by numerical analysis approach using ABAQUS software, a finite element analysis (FEA) tool. Three monopile models with the same dimension (within standard range) have been developed in ABAQUS and partitioned circumferentially into equal rings. Longitudinal partitions have been rotated through 180° as obtainable in practice. Characteristic loads typical of a real life offshore wind turbine environment have been applied to all three models, with tensile and compressive residual stresses applied as additional loads at the critical weld region to the first and second models while the third model had no additional load. With zero boundary conditions applied in all six degrees of freedom, the simulation has been run for 107 cycles of wind and wave loads as recommended in standards in each case. Stress results obtained from the critical weld region in the three models showed that the presence of tensile residual stresses equal to the material yield stress contributed a maximum 0.05% to fatigue damage of the monopile when compared with results from the model with no residual stress while the presence of compressive residual stresses with the magnitude of the yield stress of the material caused a gain of 0.06% in fatigue life by similar comparison, indicating negligible contribution of residual stresses to the stress build up in the critical weld region, thus suggesting that the magnitude of the residual stress as high as the yield stress of the material of the monopile is not large enough to cause the monopile to open up in the axial direction.","PeriodicalId":70106,"journal":{"name":"力学国际期刊(英文)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43320094","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

Analysis of the Behavior of a Square Plate in Free Vibration by FEM in Ansys Ansys有限元法分析方形板的自由振动特性

力学国际期刊(英文) Pub Date : 2020-03-19 DOI: 10.4236/wjm.2020.102002

Pascal Kuate Nkounhawa, D. Ndapeu, B. Kenmeugne, T. Beda

引用次数: 6