Finite-Element Analysis of Stress Concentration in ASTM D 638 Tension Specimens PDF Download
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Author: MG. Garrell Publisher: ISBN: Category : Elastic waves Languages : en Pages : 6
Book Description
Experimental results showed that ASTM D 638 Type IV flat tension specimens, made of a Nylon-11 matrix containing a large volume concentration of Nd-Fe-B particulates, failed at a location where the straight gage section of the specimen ends and the curved transition region begins. The stress distribution in this specimen was analyzed using the finite-element method, and it was found that there is a stress concentration at this location. The stress distributions in tension specimens with both single- and double-arc transition regions were analyzed and stress concentration factors were calculated. A linear relationship between the magnitude of the stress concentration factor and the ratio of the width in the gage section and the arc radius of the transition region is identified. This study shows that it is possible to reduce the magnitude of the stress concentration factor for the ASTM D 638 Type IV flat tension specimen by redesigning the specimen geometry without changing its overall size.
Author: MG. Garrell Publisher: ISBN: Category : Elastic waves Languages : en Pages : 6
Book Description
Experimental results showed that ASTM D 638 Type IV flat tension specimens, made of a Nylon-11 matrix containing a large volume concentration of Nd-Fe-B particulates, failed at a location where the straight gage section of the specimen ends and the curved transition region begins. The stress distribution in this specimen was analyzed using the finite-element method, and it was found that there is a stress concentration at this location. The stress distributions in tension specimens with both single- and double-arc transition regions were analyzed and stress concentration factors were calculated. A linear relationship between the magnitude of the stress concentration factor and the ratio of the width in the gage section and the arc radius of the transition region is identified. This study shows that it is possible to reduce the magnitude of the stress concentration factor for the ASTM D 638 Type IV flat tension specimen by redesigning the specimen geometry without changing its overall size.
Author: A. A. Kardak Publisher: ISBN: Category : Stress concentration Languages : en Pages : 9
Book Description
Occasionally, round specimens for tension testing that comply with ASTM standards fail in one of the transition regions between gage and grip sections. This occurs because of the stress concentration present in transition regions. When this happens, it is possible to seek stress relief by increasing fillet radii in these regions. The objective of this note is to quantify the relief afforded by increasing radii. The approach adopted to this end is finite element analysis that is carefully verified. Stress concentration factors are thus accurately determined to three figures for all of the various types of standard round specimens in ASTM E8/E8M-16a, Standard Test Methods for Tension Testing of Metallic Materials.
Author: Walter D. Pilkey Publisher: John Wiley & Sons ISBN: 1119532523 Category : Technology & Engineering Languages : en Pages : 816
Book Description
The bible of stress concentration factors—updated to reflect today's advances in stress analysis This book establishes and maintains a system of data classification for all the applications of stress and strain analysis, and expedites their synthesis into CAD applications. Filled with all of the latest developments in stress and strain analysis, this Fourth Edition presents stress concentration factors both graphically and with formulas, and the illustrated index allows readers to identify structures and shapes of interest based on the geometry and loading of the location of a stress concentration factor. Peterson's Stress Concentration Factors, Fourth Edition includes a thorough introduction of the theory and methods for static and fatigue design, quantification of stress and strain, research on stress concentration factors for weld joints and composite materials, and a new introduction to the systematic stress analysis approach using Finite Element Analysis (FEA). From notches and grooves to shoulder fillets and holes, readers will learn everything they need to know about stress concentration in one single volume. Peterson's is the practitioner's go-to stress concentration factors reference Includes completely revised introductory chapters on fundamentals of stress analysis; miscellaneous design elements; finite element analysis (FEA) for stress analysis Features new research on stress concentration factors related to weld joints and composite materials Takes a deep dive into the theory and methods for material characterization, quantification and analysis methods of stress and strain, and static and fatigue design Peterson's Stress Concentration Factors is an excellent book for all mechanical, civil, and structural engineers, and for all engineering students and researchers.
Author: M. Shafik Publisher: IOS Press ISBN: 1643683314 Category : Technology & Engineering Languages : en Pages : 416
Book Description
Within the context of Industrial 4.0 and beyond, developing and managing the technologies and operations key to sustaining the success of manufacturing businesses is crucial, and the promotion of manufacturing-engineering education, training, and research is of vital importance. This book presents the proceedings of ICMR 2022, the 19th International Conference in Manufacturing Research, Incorporating the 36th National Conference in Manufacturing Research, held in Derby, UK, from 6 - 8 September 2022. For over two decades, ICMR has been the main manufacturing research conference held in the UK. Bringing together researchers, academics, and industrialists to share their knowledge and experience, the conference provides a friendly and inclusive platform for a broad community of researchers who share the common goal of making digital and advanced manufacturing as efficient and effective as possible. The theme of ICMR2022 is smart manufacturing. Of the 78 papers submitted, 58 were accepted for presentation after review and are included here. This represents an acceptance rate of 72%. The book is divided into 8 sections: smart manufacturing; digital manufacturing; additive manufacturing; robotics and industrial automation; composite manufacturing and machining processes; product design, development and quality management; information and knowledge management; and decision support and production optimization. Exploring all core areas of digital and advanced manufacturing engineering, the book will be of interest to all those working in the field.
Author: Publisher: ISBN: Category : Languages : en Pages : 30
Book Description
Using MSC/PATRAN for pre- and post-processing of MSC/NASTRAN models, several tensile test specimen configurations were analyzed by the finite element method (FEM). Solid geometry models for each configuration were meshed using both hexagonal elements and tetrahedral elements. In all cases the mesh density was refined till the FEM solution converged. This convergence was verified both by evaluation of the solution's stability as well by various post processing tools available to the engineer within MSC/PATRAN. In each case, the ultimate goal was to determine the stress concentration factor at the specimen s net section. The sensitivity of the three dimensional stress concentration factor to specimen thickness as well as the presence of various through thickness hole sizes in the net section was also explored. In all cases, the resulting three-dimensional solution result was compared to published two dimensional elasticity solutions. While the three-dimensional FEM stress concentration solution compared favorably with the published two-dimensional values for most configurations, the same comparison for specimens with holes in the net section disagreed significantly. The disagreement between three- and two-dimensional analyses was attributed to the transition from plane stress to plain strain near thickness midplane. This work yielded valuable insight for the engineer as to when published handbook data will suffice and when a more detailed FEM solid model analysis is necessary. Additionally, the use of MSC/PATRAN tools for assessing model convergence is also contrasted with more the traditional technique of comparing degrees of freedom to variation in analysis result.
Author: MH. Kural Publisher: ISBN: Category : Composite materials Languages : en Pages : 7
Book Description
The stress state in graphite epoxy tension specimens subjected to pure tension, to combined tension, and to out-of-plane bending is analyzed. A finite element solution technique is used that includes full representation of the wedge-action grip mechanism of the testing machine as well as end tabs bonded to the test laminate with a finite thickness adhesive layer. Results of the study indicate that stresses are generally lower for the tension specimens with tapered tab geometry. Peak stresses in the specimens are found to be sensitive to tab length. thickness, and layer orientation, as well as test laminate stiffness. Out-of-plane specimen bending resulting from grip misalignment also resulted in significant increases in the specimen stresses.
Author: MG. Garrell
Author: MG. Garrell
Author: A. A. Kardak
Author: Walter D. Pilkey
Author: M. Shafik
Author: 
Author: 
Author: 
Author: S. Chaterjee
Author: James Youngpil Song
Author: MH. Kural