ASTM special technical publications最新文献_第7页

J-Q-M Approach for Failure Assessment of Fusion Line Cracks: Two-Material and Three-Material Models 熔合线裂纹失效评估的J-Q-M方法:双材料和三材料模型

ASTM special technical publications Pub Date : 2000-01-01 DOI: 10.1520/STP13398S

C. Thaulow, Zhiliang Zhang, Ø. Ranestad, M. Hauge

引用次数: 9

Fatigue life estimation under cumulative cyclic loading conditions 累积循环载荷条件下的疲劳寿命估算

ASTM special technical publications Pub Date : 2000-01-01 DOI: 10.1520/STP14796S

S. Kalluri, M. Mcgaw, G. Halford

引用次数: 5

A Viscoplasticity Model for Characterizing Loading and Unloading Behavior of Polymeric Composites 表征聚合物复合材料加载和卸载行为的粘塑性模型

ASTM special technical publications Pub Date : 2000-01-01 DOI: 10.1520/STP15838S

Chang-ming Zhu, C. Sun

引用次数: 10

Implementation of Constitutive Model in FEA for Nonlinear Behavior of Plastics 本构模型在塑料非线性有限元分析中的应用

ASTM special technical publications Pub Date : 2000-01-01 DOI: 10.1520/STP15830S

I. Skrypnyk, J. Spoormaker, W. Smit

引用次数: 5

Stress Intensity Predictions with ANSYS® for Use in Aircraft Engine Component Life Prediction 应力强度预测与ANSYS®用于飞机发动机部件寿命预测

ASTM special technical publications Pub Date : 2000-01-01 DOI: 10.1520/STP14810S

D. Slavik, R. Mcclain, K. Lewis

{"title":"Stress Intensity Predictions with ANSYS® for Use in Aircraft Engine Component Life Prediction","authors":"D. Slavik, R. Mcclain, K. Lewis","doi":"10.1520/STP14810S","DOIUrl":"https://doi.org/10.1520/STP14810S","url":null,"abstract":"Stress intensity (K) predictions are presented using crack opening displacements with 1 / 4 points elements at the crack tip to simulate the crack tip singularity. These results are compared to available literature valuesunder remote applied tension for a 2D thru-crack and a 3D semi-elliptical surface crack geometry. Crack-opening displacements with ANSYS were found to calculate K for the 2D thru-crack geometry to within 1% of an available reference solution and were not strongly influenced by the crack tip mesh parameters evaluated. Predicted stress intensities with crack-opening displacements were then considered for the surface flaw geometry for a range of crack aspect ratios (0.2 ≤ a/c ≤ 2.0) and crack depths (0.01 ≤ a/T ≤ 0.8). K for the surface flaw geometry was also not significantly influenced by the crack tip mesh refinement and matched literature solutions to within ′5% of predicted K for the crack depth position. Predicted stress intensities at the surface position using crack-opening displacement approaches were: (a) not strictly valid given the nature of the crack tip singularity, (b) dependent on the stress state assumption, and (c) dependent on the degree of mesh refinement. These difficulties were avoided by selecting a 2° angular position below the surface with a plane strain assumption to calculate K from predicted crack-opening displacements. This approach produced a stress intensity that was reasonably assumed to be representative of K at the surface position and was not significantly influenced by the mesh refinement or stress state assumptions. K with this approach was somewhat higher than results using alternative approaches in the literature. The implication of these results compared to other finite element based results with respect to Raju-Newman interpolation equations are discussed with probability plots. Examples with crack opening models in specific aircraft engine components are also provided.","PeriodicalId":8583,"journal":{"name":"ASTM special technical publications","volume":"87 1","pages":"371-390"},"PeriodicalIF":0.0,"publicationDate":"2000-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90599520","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

The Role of Cohesive Strength and Separation Energy for Modeling of Ductile Fracture 黏结强度和分离能在塑性断裂建模中的作用

ASTM special technical publications Pub Date : 2000-01-01 DOI: 10.1520/STP13400S

T. Siegmund, W. Brocks

{"title":"The Role of Cohesive Strength and Separation Energy for Modeling of Ductile Fracture","authors":"T. Siegmund, W. Brocks","doi":"10.1520/STP13400S","DOIUrl":"https://doi.org/10.1520/STP13400S","url":null,"abstract":"Barenblatt's idea of modeling the crack process zone by means of a cohesive zone has attracted considerable attention for predicting ductile crack growth. The model allows separation of the energy necessary for material separation from global plastic work. This has been a key problem in ductile fracture when searching for reasons for the geometry dependence of crack growth resistance curves. When using cohesive zone models, the correct determination of the cohesive zone material parameters is of eminent importance. In the past these parameters-the cohesive strength and the separation energy-were assumed to be material constants. However, micromechanical considerations show that this assumption is only an approximation in the case of ductile fracture. Here, the underlying mechanisms of void nucleation, growth, and coalescence are dependent on the stress triaxiality. This effect is accounted for in the new constitutive equation for cohesive zone models as presented here. In this new \"triaxiality-dependent cohesive zone model,\" the cohesive material properties are taken to be dependent on the stress triaxiality in the solid element adjacent to the cohesive element. For low triaxiality, low values of cohesive strength and large values of the separation energy are observed; the opposite holds true for cases of high triaxiality. Ductile crack growth in a mild steel under quasistatic loading was investigated. The results from the use of the triaxiality-dependent cohesive zone model are compared to those of the Gurson-Tvergaard-Needleman (GTN) model as well as to the cohesive zone model with constant material parameters. The dissipation rate is shown to be a favorable measure for the characterization of the crack growth resistance. It allows the description of both the (global) plastic dissipation and the (local) work of fracture.","PeriodicalId":8583,"journal":{"name":"ASTM special technical publications","volume":"29 5 1","pages":"139-151"},"PeriodicalIF":0.0,"publicationDate":"2000-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90601895","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: 48

Prediction of time-dependent crack growth with retardation effects in nickel base alloys 镍基合金中具有缓裂效应的时效裂纹扩展预测

ASTM special technical publications Pub Date : 2000-01-01 DOI: 10.1520/STP14812S

R. H. Stone, D. Slavik

引用次数: 11

Estimation Procedure for Determination of Fatigue Crack Propagation in Metal Alloys 测定金属合金疲劳裂纹扩展的估计方法

ASTM special technical publications Pub Date : 2000-01-01 DOI: 10.1520/STP13408S

R. Hertzberg

引用次数: 1

Evaluation of a Terrestrial Foodweb Model to Set Soil Cleanup Levels 陆地食物网模型对土壤清理水平的评价

ASTM special technical publications Pub Date : 2000-01-01 DOI: 10.1520/STP14416S

P. Doctor, K. A. Gano, N. K. Lane

引用次数: 1

Elastic-plastic fracture mechanics: Where has it been? Where is it going? 弹塑性断裂力学:发展到哪里了?它要去哪里?

ASTM special technical publications Pub Date : 2000-01-01 DOI: 10.1520/STP13391S

J. Landes

{"title":"Elastic-plastic fracture mechanics: Where has it been? Where is it going?","authors":"J. Landes","doi":"10.1520/STP13391S","DOIUrl":"https://doi.org/10.1520/STP13391S","url":null,"abstract":"Elastic-plastic fracture mechanics (EPFM) is the name given to a body of fracture technology that includes parameters, test methods, and analysis techniques. EPFM began in the 1960s, soon after it was recognized that the linear elastic approach to fracture mechanics was too limited to cover many engineering applications. It began in response to real engineering problems and continues to develop in the same application-driven mode. The development of EPFM spans more than three decades. It involved many people and a multitude of good ideas. Some of the people have gone on to other pursuits, and many of the ideas have been set aside or discarded in the never-ending debate about which is the best approach. The development of EPFM is not complete, nor is the controversy ended. It is important to look back at the factors that influenced such a vast development of technology before trying to forge ahead. This paper takes a look at the area of fracture mechanics called EPFM. It considers the development of a technology that involved people, places, and a seemingly inexhaustible supply of technical ideas. It considers what happened in the past, what is going on in the present, and speculates about what will happen for the future. Its purpose is to stop for a moment and consider for EPFM: Where has it been? Where is it going?","PeriodicalId":8583,"journal":{"name":"ASTM special technical publications","volume":"16 4 1","pages":"3-18"},"PeriodicalIF":0.0,"publicationDate":"2000-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90777807","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