Download or read book Split Hopkinson Pressure Bar Testing and Constitutive Model Evaluation for 7050 T7451 Aluminum IN718 Superalloy 300M Steel written by Xinlong Gao and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The understanding of material's response to high strain rate loading is essential for a range of applications such as high-speed forming, machining, crashworthiness of automotive structures, and similarly ballistics impact performance of armor and engine fan blade containment structures. For reliable numerical modelling of such processes, accurate high strain rate materials data and constitutive models describing the strain rate dependence of the material's stress-strain response are necessary. The Split-Hopkinson pressure bar (SHPB) has been a commonly used method for evaluating the high strain rate response of materials in the range of 102s-1 to 104s-1. Measurements from this technique is useful for producing precise data to calibrate constitutive models, and to facilitate modeling and simulation of high strain rate processes.In this study, a compressive Split-Hopkinson pressure bar (SHPB) setup was used to evaluate the stress-strain response for three alloys, Aluminum 7050-T7451, Inconel 718, and 300M steel for the modelling of shot-peening, cold-work surface modification process. Shot peening involves impacting a material's surface with spherical media to generate sub-surface deformed layers containing strain hardening and residual stress. During the peening process, strain rates of the peened material can reach up to 105s-1 to 106s-1, which is greater than strain rates measurable using the SHPB. To enable a higher strain rate response, SHPB tests were carried out at a low temperature by cooling to represent the response of an increase in strain rate through the equivalent effect of lower temperatures and higher strain rates on the measured stress. In addition, SHPB tests were carried out at specific strain rates and test temperatures for calibrating constitutive models.From SHPB tests, Aluminum 7050-T7451 stress-strain results showed an increase in strain rate sensitivity above 103s-1 and at 25°C. For varying temperature tests measured at 2×103s-1, the stress-strain at -110°C showed higher strength and initial strain hardening rate compared to the resultat 25°C. Negative strain hardening occurred for results at 100°C and 200°C and the rate of thermal softening increased at 200°C. IN718 exhibited a moderate increase in strength from 103s-1 to 4×103s-1 at 25°C. For varying temperature tests at 4×103s-1, the strength increased at -110°C relative to 25°C and the strain hardening rate was comparable in both tests. At 500°C, the measured strain hardening rate was notably lower compared to the result at 25°C. 300M steel alloys tested at 3×10s-1 and 25°C displayed stress saturation and slight negative strain hardening with increasing strain. At a strain rate of 2.4×103s-1, the strength at -70°C was greater than that at 25°C, and strain hardening trends were similar for both conditions. Stress-strain response at 200°C displayed an initial increase in strain hardening prior to softening, and stress saturation at 500°C was comparable to the result at 25°C. In addition, shear failure occurred in samples tested at varying temperatures and strain to failure was comparable in all conditions.The SHPB results attained at high strain rates, varying temperatures as well as quasi-static data at 25°C, were used to evaluate the Johnson Cook (J-C) model parameter for each alloy. A modified Johnson Cook model with Voce strain hardening law and a modified Khan-Huang-Liang (KHL) model were evaluated and provided closer fit to Aluminum 7050-T7451 and IN718 results, respectively compared to the J-C model. For 300M steel, a modified J-C model with Cowper Symonds strain rate form provided comparable correlation to experiments as the J-C model. The J-C model, and models with more adequate correlations were used to extrapolate the stress at higher strain rates to represent the response encountered during peening." --

Download or read book Application of Material Constitutive Models and Split Hopkinson Pressure Bar Technique to Two Aerospace Alloys written by Jessa Andrea Canaveral and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "In an effort to optimize the machining process of aerospace components such as landing gears and engine rotors, aerospace companies are utilizing Finite Element Modelling (FEM) intensively to avoid trial and error processing. To guarantee the reliability of the FE analysis, a correct material constitutive model must be identified and used. The model must describe the dynamic behavior of the work piece material under machining conditions, must describe the physical process occurring during the machining operation and must incorporate the appropriate material parameters. Therefore, a correct stress-strain relationship which can generalize the response of the material at high strain rates and high temperature condition is very important for a valid material modelling. In this study, dynamic behavior of two aerospace materials, Inconel 718 (IN718) and 300M Steel, were investigated. To characterize the high strain rates and high temperature behaviors of the IN718 and 300M Steel, compressive Split-Hopkinson Pressure Bar (SHPB) tests were performed over a large range of strain rates and temperatures. For the IN718 material, the experiments were carried out at strain rates between 300 s-1 to 3,500 s-1, and at temperatures between room (22°C) and 500°C. For the 300M Steel material on the other hand, the experiments were carried out at strain rates between 300 s-1 to 1,900 s-1 and at temperature conditions similar to that of the IN718 material. Also as part of this work, the evaluation of an appropriate pulse shaper material to lessen the "ring-up period" during the tests was also done. The compressive experiments showed that both IN718 and 300M Steel have significant strain rate sensitivity. The flow stress of each material increased with an increase in the strain rate and decrease in the temperature. The 300M Steel showed flow stress saturation on all deformation temperatures before failure. A clear thermal softening of the material due to the applied deformation temperatures was also observed. The experimental stress-strain data of IN718 and 300M Steel were used to obtain the material parameters of the Johnson-Cook and Modified Johnson-Cook with Cowper-Symonds function models. The models were then evaluated by numerically predicting the results of the compressive experiments. The Johnson-Cook model has very low strain rate sensitivity and thus, was unable accurately to predict the dynamic behavior of the materials. The model follows a log-linear stress-strain rate relationship while experimental data showed that the behavior of the materials differs at strain rates of 102 s-1 and 103 s-1. On the other hand, the Modified Johnson-Cook with Cowper-Symonds function model has a high strain rate sensitivity due to its power law relation. It fit the experimental data better and was able to predict the dynamic behavior of the materials well. " --

Download or read book Numerical Split Hopkinson Pressure Bar NSHPB Test and Its Applications in the Assessment and Improvement of SHPB Test Results written by Hui Meng and published by . This book was released on 2002 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Basics of Cutting and Abrasive Processes written by Hans Kurt Toenshoff and published by Springer Science & Business Media. This book was released on 2013-06-12 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manufacturing is the basic industrial activity generating real value. Cutting and abrasive technologies are the backbone of precision production in machine, automotive and aircraft building as well as of production of consumer goods. We present the knowledge of modern manufacturing in these technologies on the basis of scientific research. The theory of cutting and abrasive processes and the knowledge about their application in industrial practice are a prerequisite for the studies of manufacturing science and an important part of the curriculum of the master study in German mechanical engineering. The basis of this book is our lecture “Basics of cutting and abrasive processes” (4 semester hours/3 credit hours) at the Leibniz University Hannover, which we offer to the diploma and master students specializing in manufacturing science.

Download or read book Tribology of Metal Cutting written by Viktor P. Astakhov and published by Elsevier. This book was released on 2006-12-18 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tribology of Metal Cutting deals with the emerging field of studies known as Metal Cutting Tribology. Tribology is defined as the science and technology of interactive surfaces moving relative each other. It concentrates on contact physics and mechanics of moving interfaces that generally involve energy dissipation. This book summarizes the available information on metal cutting tribology with a critical review of work done in the past. The book covers the complete system of metal cutting testing. In particular, it presents, explains and exemplifies a breakthrough concept of the physical resource of the cutting tool. It also describes the cutting system physical efficiency and its practical assessment via analysis of the energy partition in the cutting system. Specialists in the field of metal cutting will find information on how to apply the major principles of metal cutting tribology, or, in other words, how to make the metal cutting tribology to be useful at various levels of applications. The book discusses other novel concepts and principles in the tribology of metal cutting such as the energy partition in the cutting system; versatile metrics of cutting tool wear; optimal cutting temperature and its use in the optimization of the cutting process; the physical concept of cutting tool resource; and embrittlement action. This book is intended for a broad range of readers such as metal cutting tool, cutting insert, and process designers; manufacturing engineers involved in continuous process improvement; research workers who are active or intend to become active in the field; and senior undergraduate and graduate students of manufacturing. · Introduces the cutting system physical efficiency and its practical assessment via analysis of the energy partition in the cutting system.· Presents, explains and exemplifies a breakthrough concept of the physical resource of the cutting tool.· Covers the complete system of metal cutting testing.

Download or read book Modelling of Machining Operations written by J.C. Outeiro and published by Trans Tech Publications Ltd. This book was released on 2011-04-19 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). The modelling of Machining Operations has become very widespread today, with many researchers developing models with which to predict metal-cutting performance. The aim here is to provide an answer to the challenges presented by the machining industry, which is presently facing very tight economical and environmental constraints. The collection of over 100 peer-reviewed papers covers twelve research topics, including: “Analytical and Numerical Modelling”; “Cutting Fundamentals: Input Parameters”; “Cutting Fundamentals: Experimental Validation”; “Surface Integrity”; “Surface Topography”; “Tool Wear and Tool Life”; “Dynamics and Stability”; “High-Speed Machining and 5-Axes Machining”; “Abrasive Machining”; “Ultra-Precision and Micromachining”; “Computer-Aided Manufacturing (CAM)”; “Experimental: Non-Conventional Machining”. This work will thus constitute an invaluable handbook on the subject.

Download or read book High Efficiency Deep Grinding written by Taghi Tawakoli and published by Wiley. This book was released on 1993-04-15 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: A book which describes and discusses the technological requirements and theoretical principles of high-efficiency deep grinding. The role of machine settings and their influence on the process is examined and explained. The techniques and findings presented here are based on experience gained in a wide range of industrial and research projects.

Download or read book Powder Metallurgy Alloys written by P. Ramakrishnan and published by CRC Press. This book was released on 2004-11-11 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Machining Difficult to Cut Materials written by Hossam A. Kishawy and published by Springer. This book was released on 2018-08-09 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focus on the challenges faced by cutting materials with superior mechanical and chemical characteristics, such as hardened steels, titanium alloys, super alloys, ceramics and metal matrix composites. Aspects such as costs and appropriate machining strategy are mentioned. The authors present the characteristics of the materials difficult to cut and comment on appropriate cutting tools for their machining. This book also serves as a reference tool for manufacturers working in industry.

Download or read book Statistical and Computational Techniques in Manufacturing written by J. Paulo Davim and published by Springer Science & Business Media. This book was released on 2012-03-06 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, interest in developing statistical and computational techniques for applied manufacturing engineering has been increased. Today, due to the great complexity of manufacturing engineering and the high number of parameters used, conventional approaches are no longer sufficient. Therefore, in manufacturing, statistical and computational techniques have achieved several applications, namely, modelling and simulation manufacturing processes, optimization manufacturing parameters, monitoring and control, computer-aided process planning, etc. The present book aims to provide recent information on statistical and computational techniques applied in manufacturing engineering. The content is suitable for final undergraduate engineering courses or as a subject on manufacturing at the postgraduate level. This book serves as a useful reference for academics, statistical and computational science researchers, mechanical, manufacturing and industrial engineers, and professionals in industries related to manufacturing engineering.

Download or read book International Research in Production Engineering written by Milton Clayton Shaw and published by . This book was released on 1963 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Theoretical and Applied Mechanics 1996 written by T. Tatsumi and published by North Holland. This book was released on 1997-04-25 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings present an up-to-date and comprehensive review of the field of theoretical and applied mechanics. All the papers are written by leading experts presently active in this subject area.

Download or read book Electromachining written by J. R. Crookall and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Adiabatic Shear Localization written by Yilong Bai and published by Pergamon. This book was released on 1992-01-01 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adiabatic shear localization is a mode of failure that occurs in dynamic loading. It is characterized by thermal softening occurring over a very narrow region of a material and is usually a precursor to ductile fracture and catastrophic failure. This reference source is the first detailed study of the mechanics and modes of adiabatic shear localization in solids, and provides a systematic description of a number of aspects of adiabatic shear banding. The inclusion of the appendices which provide a quick reference section and a comprehensive collection of thermomechanical data allows rapid access and understanding of the subject and its phenomena. The concepts and techniques described in this work can usefully be applied to solve a multitude of problems encountered by those investigating fracture and damage in materials, impact dynamics, metal working and other areas. This reference book has come about in response to the pressing demand of mechanical and metallurgical engineers for a high quality summary of the knowledge gained over the last twenty years. While fulfilling this requirement, the book is also of great interest to academics and researchers into materials performance.

Download or read book Annual Review of Materials Science V 28 1998 written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: