Mechanics of Advanced Materials and Modern Processes最新文献_第2页

Measurement of third-order elastic constants and stress dependent coefficients for steels 钢的三阶弹性常数和应力相关系数的测量

IF 4.03

Mechanics of Advanced Materials and Modern Processes Pub Date : 2018-02-09 DOI: 10.1186/s40759-018-0035-7

Sennosuke Takahashi

{"title":"Measurement of third-order elastic constants and stress dependent coefficients for steels","authors":"Sennosuke Takahashi","doi":"10.1186/s40759-018-0035-7","DOIUrl":"https://doi.org/10.1186/s40759-018-0035-7","url":null,"abstract":"There has been little discussion of the third-order elastic constants of steels in the literature until now. In this study, the precise second- and third-order elastic constants of polycrystalline steels were measured under adiabatic and isothermal conditions.To measure the minute change in the propagation time of the elastic wave corresponding to the tensile stress, the uniform and isotropic specimens were processed with high precision, the measuring instruments were strictly calibrated, and the temperature of the measurement chamber was kept constant. The author proposes an experimental formula to obtain the third-order elastic constants of steels. The stress dependent coefficients α\u0000 ij\u0000 in this formula are absolutely necessary to obtain the third-order elastic constants.The obtained stress dependent coefficients clearly indicated that there is a special relationship between the directions of stress and that of the oscillation of the elastic wave. When the frequency direction of the elastic wave matched the direction of the applied stress, α\u0000 ij\u0000 became a larger negative value. Lamè constants and Murnaghan’s third-order elastic constants ?,m,n were obtained for four types of steels.The second- and third-order elastic constants under adiabatic conditions were smaller than those under isothermal conditions. Oscillation of crystal lattice is nonlinear and this is observed as the third-order elastic constants. Therefore, it is possible to obtain the knowledge on the internal stress and the thermal properties of the materials. This is also the basis of theoretical discussion of the thermal expansion coefficients.","PeriodicalId":696,"journal":{"name":"Mechanics of Advanced Materials and Modern Processes","volume":"4 1","pages":""},"PeriodicalIF":4.03,"publicationDate":"2018-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40759-018-0035-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4381596","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: 25

Effect of graphene on polar and nonpolar rubber matrices 石墨烯对极性和非极性橡胶基体的影响

IF 4.03

Mechanics of Advanced Materials and Modern Processes Pub Date : 2018-02-05 DOI: 10.1186/s40759-017-0034-0

Bismark Mensah, Seok In Kang, Wonseok Wang, Changwoon Nah

{"title":"Effect of graphene on polar and nonpolar rubber matrices","authors":"Bismark Mensah, Seok In Kang, Wonseok Wang, Changwoon Nah","doi":"10.1186/s40759-017-0034-0","DOIUrl":"https://doi.org/10.1186/s40759-017-0034-0","url":null,"abstract":"So far, the effect of graphene oxide (GO) and reduced graphene oxide (rGO) in rubber matrix has not been well established.The effects of graphene oxide (GO) and reduced graphene oxide (rGO) on the physical properties of polar acrylonitrile-butadiene rubber (NBR) and non-polar Ethylene-propylene-diene terpolymer rubber (EPDM) matrix have been investigated and their properties compared. NBR vulcanizates exhibited higher cure rates compared to the EPDM systems.Effective dispersion of the nanosheets within the different matrices was observed to be a reason for the improvement in properties, but the effective nanosheets-matrix interactions played a key role in reinforcing action. This was noticeable in the various properties (crosslinking density, tensile properties, and dynamical mechanical analysis) evaluated. Typically, the polar NBR matrix was observed to show about 461 and 405% higher interactions parameter with GO and rGO fillers (loaded from 0.1~1phr) than composites of EPDM based on Kraus model.While this present work has confirmed the significance of considering the polarities of graphene sheets or derivative graphene (GSD) and their respective polymers matrices for effective property enhancement for specific applications, it has also demonstrated the future prospects of rubber-graphene nanocomposites for several applications which include structural, barrier, and dielectric energy storage materials.","PeriodicalId":696,"journal":{"name":"Mechanics of Advanced Materials and Modern Processes","volume":"4 1","pages":""},"PeriodicalIF":4.03,"publicationDate":"2018-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40759-017-0034-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4206225","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: 32

Statistical methods for mechanical characterization of randomly reinforced media 随机增强介质力学特性的统计方法

IF 4.03

Mechanics of Advanced Materials and Modern Processes Pub Date : 2017-11-21 DOI: 10.1186/s40759-017-0032-2

Mikhail Tashkinov

{"title":"Statistical methods for mechanical characterization of randomly reinforced media","authors":"Mikhail Tashkinov","doi":"10.1186/s40759-017-0032-2","DOIUrl":"https://doi.org/10.1186/s40759-017-0032-2","url":null,"abstract":"Advanced materials with heterogeneous microstructure attract extensive interest of researchers and engineers due to combination of unique properties and ability to create materials that are most suitable for each specific application. One of the challenging tasks is development of models of mechanical behavior for such materials since precision of the obtained numerical results highly depends on level of consideration of features of their heterogeneous microstructure. In most cases, numerical modeling of composite structures is based on multiscale approaches that require special techniques for establishing connection between parameters at different scales. This work offers a review of instruments of the statistics and the probability theory that are used for mechanical characterization of heterogeneous media with random positions of reinforcements. Such statistical descriptors are involved in assessment of correlations between the microstructural components and are parts of mechanical theories which require formalization of the information about microstructural morphology. Particularly, the paper addresses application of the instruments of statistics for geometry description and media reconstruction as well as their utilization in homogenization methods and local stochastic stress and strain field analysis.","PeriodicalId":696,"journal":{"name":"Mechanics of Advanced Materials and Modern Processes","volume":"3 1","pages":""},"PeriodicalIF":4.03,"publicationDate":"2017-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40759-017-0032-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4840365","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

Rheonomic phenomenon shrinkage of holes drilled in fibreglass and carbon fibre-reinforced polymer composites 玻璃纤维和碳纤维增强聚合物复合材料钻孔收缩的流变现象

IF 4.03

Mechanics of Advanced Materials and Modern Processes Pub Date : 2017-11-13 DOI: 10.1186/s40759-017-0033-1

Aleksandr Dudarev, Konstantin Volegov, Georgiy Kurzanov

{"title":"Rheonomic phenomenon shrinkage of holes drilled in fibreglass and carbon fibre-reinforced polymer composites","authors":"Aleksandr Dudarev, Konstantin Volegov, Georgiy Kurzanov","doi":"10.1186/s40759-017-0033-1","DOIUrl":"https://doi.org/10.1186/s40759-017-0033-1","url":null,"abstract":"The research is devoted to machining polymer composite materials and reflects a non-trivial, accuracy-affecting phenomenon that occurs while drilling polymer composite materials, i.e. reduction of holes diameter over time after processing.The article contains experimental data obtained in the research of rheonomic shrinkage of holes after drilling various grades of polymer composite materials. The research involved using different types of tools (high-performance Ham solid carbide drill bits and diamond drill bits). The tests were carried out combining different parameters of drilling modes. We adopted the range of spindle speed change n?=?10,000-20,000 rev/min and tool feed range Sm?=?50-300?mm/min. Measurements of shrinkage were performed with the help of ATOS III Triple Scan XL scanning system immediately after treatment and in 48?h thereafter. Based on the scanned polygonal mesh of each hole, three-dimensional models of holes drilled in the samples were built. Then, these models were verified against nominal drillings using GOM Inspect software. In this way, the values of rheonomic shrinkage were obtained. Verification was carried out according to Gaussian method of measurements by coincidence using variation variables sigma (Gaussian best-fit 3 sigma).Shrinkage of holes does not take place in structural materials. However, in polymer composite materials, shrinkage of the drilled hole of 10?mm nominal diameter may reach reduction in diameter of 0.02-0.03?mm during a period of 48?h and depends on the grade of the polymer composite material. Observations have shown that shrinkage also depends on machining mode parameters.We have developed two hypotheses to explain the influence of processing mode parameters on rheonomic shrinkage: the first one relates to the rate of processing, the second – to the force factors.","PeriodicalId":696,"journal":{"name":"Mechanics of Advanced Materials and Modern Processes","volume":"3 1","pages":""},"PeriodicalIF":4.03,"publicationDate":"2017-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40759-017-0033-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4550600","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

Reviewing the class of Al-rich Ti-Al alloys: modeling high temperature plastic anisotropy and asymmetry 富铝Ti-Al合金:高温塑性各向异性和非对称性模型

IF 4.03

Mechanics of Advanced Materials and Modern Processes Pub Date : 2017-10-02 DOI: 10.1186/s40759-017-0031-3

Helal Chowdhury, Holm Altenbach, Manja Krüger, Konstantin Naumenko

引用次数: 3

Modelling of Damage Evolution in Braided Composites: Recent Developments 编织复合材料损伤演化模型:最新进展

IF 4.03

Mechanics of Advanced Materials and Modern Processes Pub Date : 2017-08-31 DOI: 10.1186/s40759-017-0030-4

Chen Wang, Anish Roy, Vadim V. Silberschmidt, Zhong Chen

{"title":"Modelling of Damage Evolution in Braided Composites: Recent Developments","authors":"Chen Wang, Anish Roy, Vadim V. Silberschmidt, Zhong Chen","doi":"10.1186/s40759-017-0030-4","DOIUrl":"https://doi.org/10.1186/s40759-017-0030-4","url":null,"abstract":"Composites reinforced with woven or braided textiles exhibit high structural stability and excellent damage tolerance thanks to yarn interlacing. With their high stiffness-to-weight and strength-to-weight ratios, braided composites are attractive for aerospace and automotive components as well as sports protective equipment. In these potential applications, components are typically subjected to multi-directional static, impact and fatigue loadings. To enhance material analysis and design for such applications, understanding mechanical behaviour of braided composites and development of predictive capabilities becomes crucial. Significant progress has been made in recent years in development of new modelling techniques allowing elucidation of static and dynamic responses of braided composites. However, because of their unique interlacing geometric structure and complicated failure modes, prediction of damage initiation and its evolution in components is still a challenge. Therefore, a comprehensive literature analysis is presented in this work focused on a review of the state-of-the-art progressive damage analysis of braided composites with finite-element simulations. Recently models employed in the studies on mechanical behaviour, impact response and fatigue analyses of braided composites are presented systematically. This review highlights the importance, advantages and limitations of as-applied failure criteria and damage evolution laws for yarns and composite unit cells. In addition, this work provides a good reference for future research on FE simulations of braided composites.","PeriodicalId":696,"journal":{"name":"Mechanics of Advanced Materials and Modern Processes","volume":"3 1","pages":""},"PeriodicalIF":4.03,"publicationDate":"2017-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40759-017-0030-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5170680","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: 15

Modelling low velocity impact induced damage in composite laminates 复合材料层合板低速冲击损伤建模

IF 4.03

Mechanics of Advanced Materials and Modern Processes Pub Date : 2017-07-26 DOI: 10.1186/s40759-017-0029-x

Yu Shi, Constantinos Soutis

引用次数: 29

Experimental and computational studies of poly-L-lactic acid for cardiovascular applications: recent progress 聚l -乳酸心血管应用的实验与计算研究:最新进展

IF 4.03

Mechanics of Advanced Materials and Modern Processes Pub Date : 2017-07-25 DOI: 10.1186/s40759-017-0028-y

Raasti Naseem, Liguo Zhao, Yang Liu, Vadim V. Silberschmidt

{"title":"Experimental and computational studies of poly-L-lactic acid for cardiovascular applications: recent progress","authors":"Raasti Naseem, Liguo Zhao, Yang Liu, Vadim V. Silberschmidt","doi":"10.1186/s40759-017-0028-y","DOIUrl":"https://doi.org/10.1186/s40759-017-0028-y","url":null,"abstract":"Stents are commonly used in medical procedures to alleviate the symptoms of coronary heart disease, a prevalent modern society disease. These structures are employed to maintain vessel patency and restore blood flow. Traditionally stents are made of metals such as stainless steel or cobalt chromium; however, these scaffolds have known disadvantages. An emergence of transient scaffolds is gaining popularity, with the structure engaged for a required period whilst healing of the diseased arterial wall occurs. Polymers dominate a medical device sector, with incorporation in sutures, scaffolds and screws. Thanks to their good mechanical and biological properties and their ability to degrade naturally. Polylactic acid is an extremely versatile polymer, with its properties easily tailored to applications. Its dominance in the stenting field increases continually, with the first polymer scaffold gaining FDA approval in 2016. Still some challenges with PLLA bioresorbable materials remain, especially with regard to understanding their mechanical response, assessment of its changes with degradation and comparison of their performance with that of metallic drug-eluting stent. Currently, there is still a lack of works on evaluating both the pre-degradation properties and degradation performance of these scaffolds. Additionally, there are no established material models incorporating non-linear viscoelastic behaviour of PLLA and its evolution with in-service degradation. Assessing these features through experimental analysis accompanied by analytical and numerical studies will provide powerful tools for design and optimisation of these structures endorsing their broader use in stenting. This overview assesses the recent studies investigating mechanical and computational performance of poly(l-lactic) acid and its use in stenting applications.","PeriodicalId":696,"journal":{"name":"Mechanics of Advanced Materials and Modern Processes","volume":"3 1","pages":""},"PeriodicalIF":4.03,"publicationDate":"2017-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40759-017-0028-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4968576","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: 18

Recent advancements in mechanical characterisation of 3D woven composites 三维机织复合材料力学特性的最新进展

IF 4.03

Mechanics of Advanced Materials and Modern Processes Pub Date : 2017-07-10 DOI: 10.1186/s40759-017-0027-z

Mohamed Nasr Saleh, Constantinos Soutis

{"title":"Recent advancements in mechanical characterisation of 3D woven composites","authors":"Mohamed Nasr Saleh, Constantinos Soutis","doi":"10.1186/s40759-017-0027-z","DOIUrl":"https://doi.org/10.1186/s40759-017-0027-z","url":null,"abstract":"Three dimensional (3D) woven composites have attracted the interest of academia and industry thanks to their damage tolerance characteristics and automated fabric manufacturing. Although much research has been conducted to investigate their out-of-plane “through thickness” properties, still their in-plane properties are not fully understood and rely on extensive experimentation. To date, the literature lacks an inclusive summary of the mechanical characterisation for 3D woven composites. Therefore, the objective of this paper is to provide a comprehensive review of the available research studies on 3D woven composites mechanical characterisation, with less emphasis on the out-of-plane response, but an in-depth review of the in-plane response “un-notched vs. notched”. The paper highlights the knowledge gap in the literature of 3D woven composites, suggesting opportunities for future research in this field and a room for improvement in utilising Non-Destructive Techniques (NDT), such as Digital Image Correlation (DIC), Acoustic Emission (AE) and X-ray Computed Tomography (CT), for observing damage initiation and evolution in 3D woven composites that could be used to calibrate and evaluate analytical and numerical models.","PeriodicalId":696,"journal":{"name":"Mechanics of Advanced Materials and Modern Processes","volume":"3 1","pages":""},"PeriodicalIF":4.03,"publicationDate":"2017-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40759-017-0027-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4422975","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: 56

Computational study for reliability improvement of a circuit board 电路板可靠性改进的计算研究

IF 4.03

Mechanics of Advanced Materials and Modern Processes Pub Date : 2017-06-05 DOI: 10.1186/s40759-017-0024-2

B. Emek Abali

{"title":"Computational study for reliability improvement of a circuit board","authors":"B. Emek Abali","doi":"10.1186/s40759-017-0024-2","DOIUrl":"https://doi.org/10.1186/s40759-017-0024-2","url":null,"abstract":"An electronic device consists of electronic components attached on a circuit board. Reliability of such a device is limited to fatigue properties of the components as well as of the board. Printed circuit board (PCB) consists of conducting traces and vertical interconnect access (via) out of copper embedded in a composite material. Usually the composite material is fiber reinforced laminate out of glass fibers and polyimid matrix. Different reasons play a role by choosing the components of the laminate for the board, one of them is its structural strength and fatigue properties. An improvement of board’s lifetime can be proposed by using computational mechanics.In this work we present the theory and computation of a simplified one layer circuit board conducting electrical signals along its copper via, producing heat that leads to thermal stresses.Such stresses are high enough to perform a plastic deformation. Although the plastic deformation is small, subsequent use of the electronic device causes accumulating plastic deformation, which ends the lifetime effected by a fatigue failure in the copper via.Computer simulations provide a convenient method for understanding the nature of this phenomenon as well as predicting the lifetime. We present a coupled and monolithic way for solving the multiphysics problem of this electro-thermo-mechanical system, numerically, by using finite element method in space and finite difference method in time.","PeriodicalId":696,"journal":{"name":"Mechanics of Advanced Materials and Modern Processes","volume":"3 1","pages":""},"PeriodicalIF":4.03,"publicationDate":"2017-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s40759-017-0024-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4214487","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