失效分析与预防最新文献_第2页

Reliability-Centered Maintenance Approach Applied to a Pipeline 以可靠性为中心的管道维护方法

失效分析与预防 Pub Date : 1996-11-17 DOI: 10.1115/imece1996-0867

Kerry S. Checkwitch, A. Glover, Thomas Van Hardeveld

引用次数: 0

Thermoelastoplastic Stresses in a Rotating Disk of Temperature Dependent Properties With Temperature Gradient 具有温度梯度的旋转圆盘中的热弹塑性应力

失效分析与预防 Pub Date : 1996-11-17 DOI: 10.1115/imece1996-0861

S. Jahanian

{"title":"Thermoelastoplastic Stresses in a Rotating Disk of Temperature Dependent Properties With Temperature Gradient","authors":"S. Jahanian","doi":"10.1115/imece1996-0861","DOIUrl":"https://doi.org/10.1115/imece1996-0861","url":null,"abstract":"\u0000 There are numerous situations in industry where rotating disks are subjected to cyclic thermal loading. If the operating thermal loading remain in the shakedown region, no plastic deformation occur and the system works safely. However, depending on the speed of cooling and other operating situations, inelastic deformation and incremental growth of the structure in question may occur. This may lead to the incremental deformation, and eventually incremental collapse of the mechanical components. Accordingly. it is essential to develop a numerical method to predict the ine|astic response of mechanical components to the thermal or thermo-mechanical loading. Analysing the aformentioned problems is quit complex, accordingly in this reaserch effort we begin with a simple case.\u0000 In this paper a numerical method is presented for estimating the thermoelatoplastic stresses developed in a rotating disk, subjected to temperature gradient. The disk’s temperature in the radial direction varies from 100 °F temperature to 1500 °F. The steady state temperature distribution is evaluated using the familiar Carslaw and Jeagar equations. For inelastic behavior of the disk a combined analytical and numerical method is presented. The properties of the material are assumed to be temperature dependent. The material is also assumed to be characterized by nonlinear strain hardening. For this analysis a quasi static uncoupled thermoelastoplastic solution is presented. The problem is also solved for a case when the properties of material are not function of temperature. The effect of temperature dependency of the material on the results is investigated.","PeriodicalId":64773,"journal":{"name":"失效分析与预防","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88177706","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

Two-Dimensional Stress Analysis of Single-Lap Joints of Dissimilar Adherends Subjected to External Bending Moments 外弯矩作用下异型单搭接节点的二维应力分析

失效分析与预防 Pub Date : 1996-11-17 DOI: 10.1299/KIKAIA.62.2580

K. Nakano, T. Sawa, H. Toratani

引用次数: 1

Axisymmetrical Thermal Stress Analysis of Laminated Composite Finite Hollow Cylinders Restricted at Both Ends in Steady State 两端受限层合复合材料有限空心圆柱体稳态轴对称热应力分析

失效分析与预防 Pub Date : 1996-11-17 DOI: 10.1115/imece1996-0860

M. Katsuo, T. Sawa, Koji Kawaguchi, H. Kawamura

引用次数: 2

Relative Index Method for Nonlinear Strain Analysis of Piezoceramic Sensored Structure 压电陶瓷传感结构非线性应变分析的相对指标法

失效分析与预防 Pub Date : 1996-11-17 DOI: 10.1115/imece1996-0863

Y. Lin, T. Lee, D. Saravanos

{"title":"Relative Index Method for Nonlinear Strain Analysis of Piezoceramic Sensored Structure","authors":"Y. Lin, T. Lee, D. Saravanos","doi":"10.1115/imece1996-0863","DOIUrl":"https://doi.org/10.1115/imece1996-0863","url":null,"abstract":"\u0000 In this paper, a relative index method is proposed to analyze the nonlinear Von Karman strain effects on the piezoceramic sensored rotor blades. Although other qualitative and quantitative methods are available for nonlinear strain analysis, these methods have inherent drawbacks. For qualitative method the fuzzy terms such as severe, negligible influence, etc., are usually used to describe the effect. The main disadvantage of using these terms is that to different people the same fuzzy word can be interpreted differently. This causes inconsistency which may lead to inaccurate analysis. For quantitative methods, the major disadvantage is that they are unable to delineate the whole picture of the nonlinear effects. However, the proposed relative index method circumvents the drawbacks of both qualitative and quantitative methods. Firstly, it measures the nonlinear effect and converts it into a numerical value. The value is in the range of zero to one in which zero is corresponding to negligible effects and one indicates the highest severity of the nonlinear effects. In addition, to generate the index value this method takes the whole picture of nonlinear effect response into consideration.\u0000 The results of using the relative index method show that at any given mode of vibration the nonlinear effect on sensor is relatively negligible at high rate of rotation than that on lower ones. The results also indicate that the nonlinear effect is increasing at lower modes of vibration but its effect on sensor almost levels off at higher modes. Moreover, if comparing index value of a given modes of vibration with the index value of its preceding modes, the effect of nonlinearity is decreasing. In addition, the results also suggest that at any given instantaneous speed of rotation the level of the nonlinear effect is diminishing with the higher acceleration/deceleration rate of operation of the blade.","PeriodicalId":64773,"journal":{"name":"失效分析与预防","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89400580","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