发布求助
文献互助 智能选刊 最新文献

Mechanics最新文献

筛选
英文 中文
Analysis of equivalent substitution of rectangular stress block for nonlinear stress diagram 非线性应力图的矩形应力块等效替代分析
Mechanics Pub Date : 2024-04-04 DOI: 10.5755/j02.mech.36222
E. Dulinskas, D. Zabulionis
{"title":"Analysis of equivalent substitution of rectangular stress block for nonlinear stress diagram","authors":"E. Dulinskas, D. Zabulionis","doi":"10.5755/j02.mech.36222","DOIUrl":"https://doi.org/10.5755/j02.mech.36222","url":null,"abstract":"This article deals with the analysis of equivalency of the substitution of rectangular stress block for nonlinear stress diagram with descending branch for the calculation of flexural, eccentrically compressed and eccentrically tensioned reinforced concrete members of rectangular cross-section. The method for equivalent substitution of these diagrams is proposed. Analytical relationships of area and its centre for the nonlinear diagram with descending branch are presented. Coefficients for equivalent  substitution of the said diagrams for the standard concrete strength classes are determined and given. It gives the opportunity to design reinforced concrete members  using rectangular stress block model. Substitution of the diagrams applied in EC2 and in STR 2.05.05:2005 is compared with the equivalent substitution of rectangular stress diagram for nonlinear stress diagram with descending branch. It is shown that in STR 2.05.05:2005 description of the ratio between the depth of the rectangular diagram and that of the equivalent nonlinear one with descending branch is very poor. An explicit analytical relationship for this ratio and its linear approximation in respect to the concrete characteristic and design strengths are presented in this article as well.","PeriodicalId":511970,"journal":{"name":"Mechanics","volume":"32 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140743204","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
Features of hardening of the case parts made of aluminium alloys 铝合金外壳部件淬火的特点
Mechanics Pub Date : 2024-04-04 DOI: 10.5755/j02.mech.36221
M. Matlin, S. Lebsky, A. Frolova, A. Mozgunova
{"title":"Features of hardening of the case parts made of aluminium alloys","authors":"M. Matlin, S. Lebsky, A. Frolova, A. Mozgunova","doi":"10.5755/j02.mech.36221","DOIUrl":"https://doi.org/10.5755/j02.mech.36221","url":null,"abstract":"The dependence of the hardened layer depth on the modes of superficial treatment is experimentally investigated, with the purpose of evaluation of known laws of initial linear contact of the strengthening part and the tool. The method of the definition of optimum loading on strengthening tool (the steel cylindrical roller) and its radius at static  stamping is offered. The technique is examined with the reference to the case parts made of aluminum alloys.","PeriodicalId":511970,"journal":{"name":"Mechanics","volume":"25 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140743032","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
Stress distribution in multilayer structural element subjected to skew bending 多层结构元件在受到倾斜弯曲时的应力分布
Mechanics Pub Date : 2024-04-04 DOI: 10.5755/j02.mech.36220
J. Bareišis, A. Daniškevičiūtė, V. Kleiza
{"title":"Stress distribution in multilayer structural element subjected to skew bending","authors":"J. Bareišis, A. Daniškevičiūtė, V. Kleiza","doi":"10.5755/j02.mech.36220","DOIUrl":"https://doi.org/10.5755/j02.mech.36220","url":null,"abstract":"Results of researches on strength and stiffness of diagonally bending sandwich girders having geometric and/or stiffness asymmetry have been given. A mathematical module for calculation of normal strain (strength) and stiffness on bending at any cross-section point of sandwich girder has been proposed. The kinetics of stiffness on bending and strength variation dependences when geometric parameters of a cross-section and tension modulus ratios of girder layers are changing have been examined. It has been established that the strength of a diagonally bending sandwich girder on the whole depends on the position of the centre of stiffness and the position of the neutral plane.","PeriodicalId":511970,"journal":{"name":"Mechanics","volume":"13 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140743966","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
Development of mobile minirobots for in pipe inspection tasks 开发用于管道检测任务的移动微型机器人
Mechanics Pub Date : 2024-04-04 DOI: 10.5755/j02.mech.36228
O. Tǎtar, D. Mandru, I. Ardelean
{"title":"Development of mobile minirobots for in pipe inspection tasks","authors":"O. Tǎtar, D. Mandru, I. Ardelean","doi":"10.5755/j02.mech.36228","DOIUrl":"https://doi.org/10.5755/j02.mech.36228","url":null,"abstract":"The possibilities to use a miniaturized robotic system for inspection, exploration and maintenance of the pipes are highlighted. In this paper, the authors’ contributionin this field is discussed. Two in-pipe minirobots developed by the authors are described. The efforts are focused on the in-pipe mobility and corresponding actuationsystems. Several functional characteristics (e.g. the maximum /minimum inner pipe diameter) are given.","PeriodicalId":511970,"journal":{"name":"Mechanics","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140742529","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: 55
Effect of environment temperature on fatigue properties of laminated leather 环境温度对层压皮革疲劳性能的影响
Mechanics Pub Date : 2024-04-04 DOI: 10.5755/j02.mech.36224
D. Milašienė
{"title":"Effect of environment temperature on fatigue properties of laminated leather","authors":"D. Milašienė","doi":"10.5755/j02.mech.36224","DOIUrl":"https://doi.org/10.5755/j02.mech.36224","url":null,"abstract":"In this study the influence of environment temperature on the mechanical properties (tensile strength and elasticity modulus at break) of laminated leather and its layers (split leather and microporous polyurethane (PU) Permair film) under fatigue flexing have been investigated. The testing was carried out by changing the temperature from 20 ± 2°C to −20 ± 2°C (number of cycles NC = 105). The experimental results showed that the character of the dependences of tensile strength and elasticity modulus at break on temperature of fatigue environment of both leathers is similar and significantly differ from characters of analogous dependences of microporous PU film. The defects on the surface of laminated leather become clearly visible when the temperature falls to ≤ -10°C.","PeriodicalId":511970,"journal":{"name":"Mechanics","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140742708","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
Transient characterisation and analysis of shape memory alloy wire bundles for the actuation of finger joints in prosthesis design 用于假肢设计中手指关节驱动的形状记忆合金线束的瞬态表征和分析
Mechanics Pub Date : 2024-04-04 DOI: 10.5755/j02.mech.36229
K. O'Toole, M. McGrath, D. Hatchett
{"title":"Transient characterisation and analysis of shape memory alloy wire bundles for the actuation of finger joints in prosthesis design","authors":"K. O'Toole, M. McGrath, D. Hatchett","doi":"10.5755/j02.mech.36229","DOIUrl":"https://doi.org/10.5755/j02.mech.36229","url":null,"abstract":"Most current lower arm/hand prosthesis designs incorporate relatively bulky, heavy dc motors that produce substantial noise when performing actuation which rendersthem uncomfortable for the end-user. The engineering challenge is to produce more effective powered upper limb prosthetic solutions. Identification, characterisation and testing of actuation methods with better force to weight ratios are essential pre-requisites for this. The main aim of this work is to carry out a comprehensive study to establish conclusively the feasibility of employing Shape Memory Alloys (SMA’s) in the actuation of prosthetic finger designs. A comprehensive review of existing literature has been undertaken in order to establish the maximum grip forces at each phalanx of the human hand under different loading conditions. An experiment was developed in conjunction with this review to estimate the time response of the hand during a gripping/releasing action. These results, in combination with physical dimensions, will be used to drive the design of a prosthetic limb. \u0000A test rig has been developed which can facilitate complete transient and steady-state characterisation of a range of SMA wire diameters and bundle configurations. Anumber of different configurations were tested, each configuration having a different combination of 150 μm and 300 μm diameter nitinol wires. A data acquisition systemwas used to capture and retain data pertaining to the full characterisation of the bundles and in particular the strain and force capabilities of the various arrangements. A direct comparison is made between the actuator capabilities and the requirements of a working limb for basic gripping actions. This work will contribute to the development of an improved powered prosthetic solution.","PeriodicalId":511970,"journal":{"name":"Mechanics","volume":"49 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140742977","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: 9
Modelling deformable boundary by spherical particle for normal contact 用球形粒子为正常接触的可变形边界建模
Mechanics Pub Date : 2024-04-04 DOI: 10.5755/j02.mech.36219
R. Jasevičius, R. Kačianauskas
{"title":"Modelling deformable boundary by spherical particle for normal contact","authors":"R. Jasevičius, R. Kačianauskas","doi":"10.5755/j02.mech.36219","DOIUrl":"https://doi.org/10.5755/j02.mech.36219","url":null,"abstract":"The normal contact of the elastic spherical particle with deformable boundary is investigated in terms of the Discrete Element Method (DEM). The particle of the prescribed radius is moving under gravity and the initial velocity. The deformable boundary is treated as rigidly fixed spherical particle with variable elasticity modulus and variable radius. The limit case, approaching the infinite radius presents an elastic half-space, while increasing of the elasticity modulus presents the rigid boundary, respectively. \u0000The linear model and the nonlinear Hertz contact model used in the discrete element method are investigated numerically by applying the 5th-order Gear’s  predictorcorrector integration scheme. The numerical model is tested by comparing it with analytical solution. The time variations of the particle positions, velocities and  accelerations are presented. On the basis of simulation results the limit values of the boundary particle parameters are evaluated and recommendations for the boundary  article parameters required in DEM simulation are drown.","PeriodicalId":511970,"journal":{"name":"Mechanics","volume":"5 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140741285","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
Autonomous mobile robots for outdoor tasks 执行户外任务的自主移动机器人
Mechanics Pub Date : 2024-04-04 DOI: 10.5755/j02.mech.36230
H. Loose
{"title":"Autonomous mobile robots for outdoor tasks","authors":"H. Loose","doi":"10.5755/j02.mech.36230","DOIUrl":"https://doi.org/10.5755/j02.mech.36230","url":null,"abstract":"This paper presents a low-cost hardware platform for outdoor robots, being suitable for education, industrial prototyping and private use. The choice of components isdiscussed, including platform, sensors and controller as well as GPS and image processing hardware. Furthermore, a software approach is proposed, allowing students and researchers to easily implement own algorithms for localization, navigation and the tasks to fulfill. Several robots can be integrated in a framework which connects various different hardware platforms, called the BOSPORUS network. Together with other components, they form an intelligent network for gathering sensor and image data, sensor data fusion, navigation and control of mobile platforms. The architecture of a reference platform on the campus of the Brandenburg University of Applied Sciences is presented and evaluated.","PeriodicalId":511970,"journal":{"name":"Mechanics","volume":"18 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140744674","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
Analysis the interaction of two cylindrical surfaces under shock impact load 冲击载荷下两个圆柱面的相互作用分析
Mechanics Pub Date : 2024-04-04 DOI: 10.5755/j02.mech.36226
V. Doroševas, Vitalijus Volkovas
{"title":"Analysis the interaction of two cylindrical surfaces under shock impact load","authors":"V. Doroševas, Vitalijus Volkovas","doi":"10.5755/j02.mech.36226","DOIUrl":"https://doi.org/10.5755/j02.mech.36226","url":null,"abstract":"The reactions of pipeline systems to shock impact load and the possibilities of the simulation and evaluation of dynamic processes are investigated in the paper. A heterogeneous system is composed of the elements with different properties, e.g. a pipeline with the sediment inside. Impact effect on it is one of the most effective methods to make substantial qualitative and quantitative changes in such system. The mathematical model for calculation of the elastically plastic displacements of the sediment was derived. It allows the analysis of dynamics of the change of the system’s specific state. The paper presents the calculation results of elastically plastic displacements of the substance caused by explosions in pipeline systems.","PeriodicalId":511970,"journal":{"name":"Mechanics","volume":"7 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140745055","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
Material properties identification. Comparison of two techniques 材料特性鉴定。两种技术的比较
Mechanics Pub Date : 2024-04-04 DOI: 10.5755/j02.mech.36223
P. Ragauskas, E. Skukis
{"title":"Material properties identification. Comparison of two techniques","authors":"P. Ragauskas, E. Skukis","doi":"10.5755/j02.mech.36223","DOIUrl":"https://doi.org/10.5755/j02.mech.36223","url":null,"abstract":"Present paper describes the comparison of two different material properties identification techniques in order to investigate a possibility of combination of two techniques into one powerful and fast tool for material properties identification. Both methods are theoretically described and main options are given in this article. Some experiments wherein aluminium material properties are identified are carried out. Methods are qualified, conclusions and proposals are given.","PeriodicalId":511970,"journal":{"name":"Mechanics","volume":"39 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140743121","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信