Download A Contribution To Enlarge The Application Limits Of Residual Stress Analyses By The Hole Drilling And The Ring Core Method full books in PDF, epub, and Kindle. Read online A Contribution To Enlarge The Application Limits Of Residual Stress Analyses By The Hole Drilling And The Ring Core Method ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis A Contribution to Enlarge the Application Limits of Residual Stress Analyses by the Hole-Drilling and the Ring-Core Method by : Andreas Nau
Download or read book A Contribution to Enlarge the Application Limits of Residual Stress Analyses by the Hole-Drilling and the Ring-Core Method written by Andreas Nau and published by kassel university press GmbH. This book was released on 2016-01-01 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Residual stress analysis in polymer materials using the hole drilling method – basic principles and applications by : Arnaud Magnier
Download or read book Residual stress analysis in polymer materials using the hole drilling method – basic principles and applications written by Arnaud Magnier and published by kassel university press GmbH. This book was released on 2018-12-17 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
This book describes the theory and practice of the Hole-Drilling Method for measuring residual stresses in engineering components. Such measurements are important because residual stresses have a "hidden" character because they exist locked-in within a material, independent of any external load. These stresses are typically created during component manufacture, for example, during welding, casting, or forming. Because of their hidden nature, residual stresses are difficult to measure and consequently are often ignored. However, they directly add to loading stresses and can cause catastrophic failure if not properly included during engineering design. Thus, there is an urgent need to be able to identify and measure residual stresses conveniently and reliably. The Hole-Drilling Method provides an adaptable and well-proven method for measuring residual stresses in a wide range of materials and component types. It is convenient to use and gives reliable results. Because of the hidden nature of residual stresses, the measurement method must necessarily be indirect, thus, additional care and conceptual understanding are necessary to achieve successful results. This book provides a practical introduction to the Hole-Drilling Method, starting from its historical roots and going on to focus on its modern practice. The various chapters describe the nature of residual stresses, the principle of hole-drilling measurements, procedures and guidance on how to make successful measurements, and effective mathematical procedures for stress computation and analysis. The book is intended for practitioners who need to make residual stress measurements either occasionally or routinely, for practicing engineers, for researchers, and for graduate engineering and science students.
Book Synopsis Hole-Drilling Method for Measuring Residual Stresses by : Gary S.
Download or read book Hole-Drilling Method for Measuring Residual Stresses written by Gary S. and published by Springer Nature. This book was released on 2022-05-31 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the theory and practice of the Hole-Drilling Method for measuring residual stresses in engineering components. Such measurements are important because residual stresses have a "hidden" character because they exist locked-in within a material, independent of any external load. These stresses are typically created during component manufacture, for example, during welding, casting, or forming. Because of their hidden nature, residual stresses are difficult to measure and consequently are often ignored. However, they directly add to loading stresses and can cause catastrophic failure if not properly included during engineering design. Thus, there is an urgent need to be able to identify and measure residual stresses conveniently and reliably. The Hole-Drilling Method provides an adaptable and well-proven method for measuring residual stresses in a wide range of materials and component types. It is convenient to use and gives reliable results. Because of the hidden nature of residual stresses, the measurement method must necessarily be indirect, thus, additional care and conceptual understanding are necessary to achieve successful results. This book provides a practical introduction to the Hole-Drilling Method, starting from its historical roots and going on to focus on its modern practice. The various chapters describe the nature of residual stresses, the principle of hole-drilling measurements, procedures and guidance on how to make successful measurements, and effective mathematical procedures for stress computation and analysis. The book is intended for practitioners who need to make residual stress measurements either occasionally or routinely, for practicing engineers, for researchers, and for graduate engineering and science students.
The primary focus of this work is the processing – microstructure – property correlation of EBM manufactured high-alloyed austenitic CrMnNi stainless steel. Independent of the applied process parameters, to this point this alloy exhibits a fine-grained and weak textured microstructure in the as-built state upon EBM processing. As detailed in the literature review, this is opposite to numerous alloys like the benchmark AISI 316L stainless steel, which are commonly characterized by epitaxial growth of columnar grains elongated parallel to building direction. A theory for this unusual observation is presented based on a grain refinement due the process-inherent cyclic heat-treatment, i.e. repetitive reheating and partial melting of the consolidated material due to the energy input during melting of subsequent layers and resulting solid-liquid as well as solid-solid (ferritic bcc to austenitic fcc phase and vice versa) phase transformations. A calculation of the phase diagram, differential thermal II Abstract analysis and the investigation of the uppermost layers of bulky and thin-walled EBM processed structures are conducted to support this assumption. Moreover, the CrMnNi stainless steel specimens are characterized by an outstanding damage tolerance, which is demonstrated by tensile testing and examination of the fracture surfaces revealing large lack-of-fusion defects due to unsuitable process parameters. Combined EBSD and X-ray diffraction analysis attribute the high damage tolerance to a pronounced strain hardening and mitigation of the effect of defects due to the transformation-induced plasticity (TRIP) effect. The deformation-induced martensitic transformation and associated strain hardening has also been correlated to a considerable low-cycle fatigue performance even under the presence of large inhomogeneities. The chemical composition of the alloy upon EBM processing is strongly dependent on the process parameters, i.e. it is demonstrated that the evaporation rate of Mn varies with the scan strategy and volumetric energy density. This phenomenon is utilized for the fabrication of homogeneous specimens with different Mn concentrations and resulting mechanical properties.These findings are subsequently employed for a prove-of-concept of the possibility to produce functionally graded material by a spatial adjustment of the scan strategy throughout the layer-wise built-up of objects. This is a novel approach for the synthetization of functionally graded materials based on the processing of one homogenous precursor powder feedstock. In summary, the particular CrMnNi stainless steel is introduced as a novel alloy design for AM because it addresses current material-related issues inherent in layer-wise technologies and potentially further contributes to the exploitation of the full potential of AM.
Book Synopsis Electron Beam Melting of Metastable Austenitic Stainless Steel by : Johannes Günther
Download or read book Electron Beam Melting of Metastable Austenitic Stainless Steel written by Johannes Günther and published by BoD – Books on Demand. This book was released on 2020-01-01 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary focus of this work is the processing – microstructure – property correlation of EBM manufactured high-alloyed austenitic CrMnNi stainless steel. Independent of the applied process parameters, to this point this alloy exhibits a fine-grained and weak textured microstructure in the as-built state upon EBM processing. As detailed in the literature review, this is opposite to numerous alloys like the benchmark AISI 316L stainless steel, which are commonly characterized by epitaxial growth of columnar grains elongated parallel to building direction. A theory for this unusual observation is presented based on a grain refinement due the process-inherent cyclic heat-treatment, i.e. repetitive reheating and partial melting of the consolidated material due to the energy input during melting of subsequent layers and resulting solid-liquid as well as solid-solid (ferritic bcc to austenitic fcc phase and vice versa) phase transformations. A calculation of the phase diagram, differential thermal II Abstract analysis and the investigation of the uppermost layers of bulky and thin-walled EBM processed structures are conducted to support this assumption. Moreover, the CrMnNi stainless steel specimens are characterized by an outstanding damage tolerance, which is demonstrated by tensile testing and examination of the fracture surfaces revealing large lack-of-fusion defects due to unsuitable process parameters. Combined EBSD and X-ray diffraction analysis attribute the high damage tolerance to a pronounced strain hardening and mitigation of the effect of defects due to the transformation-induced plasticity (TRIP) effect. The deformation-induced martensitic transformation and associated strain hardening has also been correlated to a considerable low-cycle fatigue performance even under the presence of large inhomogeneities. The chemical composition of the alloy upon EBM processing is strongly dependent on the process parameters, i.e. it is demonstrated that the evaporation rate of Mn varies with the scan strategy and volumetric energy density. This phenomenon is utilized for the fabrication of homogeneous specimens with different Mn concentrations and resulting mechanical properties.These findings are subsequently employed for a prove-of-concept of the possibility to produce functionally graded material by a spatial adjustment of the scan strategy throughout the layer-wise built-up of objects. This is a novel approach for the synthetization of functionally graded materials based on the processing of one homogenous precursor powder feedstock. In summary, the particular CrMnNi stainless steel is introduced as a novel alloy design for AM because it addresses current material-related issues inherent in layer-wise technologies and potentially further contributes to the exploitation of the full potential of AM.
This dissertation thesis focuses on applying the powder bed fusion with laser beam (PBF-LB) technology on hot work steel. It aims at achieving comparable properties with the products from the traditional manufacturing route. Using the reference powder H13, the influence of various factors, i.e., laser settings (such as laser power and scan speed) and machine settings (such as preheating) on the melting pool morphology and printing defects, is intensively investigated to check the feasibility of printing H13 components through PBF-LB technology and finally optimize the fabrication parameters for high-quality printing in lab-scale size. Furthermore, the consecutive research on the impact of the post-treatment, machine sensitivity, and powder condition provides a basis for scaling up the process and offers industrially usable products with adequate properties. Furthermore, after assessing the defects during the investigation, the classification of the defects deepens the understanding of the material-laser interaction. The mechanism for stress-lead cracks can guide the development of new types of material applied to the PBF-LB process, especially carbon-bearing steel. Finally, based on the mechanism of defect generation, the principle of the real-time defect-based monitoring system is proposed. After recognizing defects and assembling discrete points, the digital twin is established from various monitoring signals, which can be applied for on-time quality assurance without destructive testing.
Book Synopsis Hot work tool steel in laser powder bed fusion: from parameter optimization to quality monitoring in industrial application by : Liang Wu
Download or read book Hot work tool steel in laser powder bed fusion: from parameter optimization to quality monitoring in industrial application written by Liang Wu and published by BoD – Books on Demand. This book was released on 2024-01-01 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation thesis focuses on applying the powder bed fusion with laser beam (PBF-LB) technology on hot work steel. It aims at achieving comparable properties with the products from the traditional manufacturing route. Using the reference powder H13, the influence of various factors, i.e., laser settings (such as laser power and scan speed) and machine settings (such as preheating) on the melting pool morphology and printing defects, is intensively investigated to check the feasibility of printing H13 components through PBF-LB technology and finally optimize the fabrication parameters for high-quality printing in lab-scale size. Furthermore, the consecutive research on the impact of the post-treatment, machine sensitivity, and powder condition provides a basis for scaling up the process and offers industrially usable products with adequate properties. Furthermore, after assessing the defects during the investigation, the classification of the defects deepens the understanding of the material-laser interaction. The mechanism for stress-lead cracks can guide the development of new types of material applied to the PBF-LB process, especially carbon-bearing steel. Finally, based on the mechanism of defect generation, the principle of the real-time defect-based monitoring system is proposed. After recognizing defects and assembling discrete points, the digital twin is established from various monitoring signals, which can be applied for on-time quality assurance without destructive testing.
Book Synopsis Optical/ring Core Residual Stress Measurement Method and Industrial Applications of Both Ring-core and Hole-drilling Methods by : Wei Ren
Download or read book Optical/ring Core Residual Stress Measurement Method and Industrial Applications of Both Ring-core and Hole-drilling Methods written by Wei Ren and published by . This book was released on 2004 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
This book provides complete coverage of the slitting method. It details new results in analysis, computation, and estimation and discusses different roles of residual stresses from the fracture mechanics perspective. It provides detailed formulations and examples of compliance functions, weighted least squares fit and convergence test in stress estimation, and computer programs to facilitate the implementation of the slitting method.
Book Synopsis Residual Stress Measurement and the Slitting Method by : Weili Cheng
Download or read book Residual Stress Measurement and the Slitting Method written by Weili Cheng and published by Springer Science & Business Media. This book was released on 2007-02-24 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides complete coverage of the slitting method. It details new results in analysis, computation, and estimation and discusses different roles of residual stresses from the fracture mechanics perspective. It provides detailed formulations and examples of compliance functions, weighted least squares fit and convergence test in stress estimation, and computer programs to facilitate the implementation of the slitting method.
Residual stresses (RS) are stresses present inside materials even in the absence of any applied load. They are of capital importance because they can impact greatly on the mechanical strength of the material, on its dimensional correspondence to design specifications as well as on the fatigue life of the part. RS measurement and evaluation is currently an important research topic where a lot of challenges still need to be addressed. This book aims to provide the reader with an overview of the principal novelties in this field including current limitations and potential future developments. Both radically new experimental approaches as well as recent evolutions of consolidated ones will be presented, along with the latest novelties in the area of numerical residual stress evaluation.
Book Synopsis New Challenges in Residual Stress Measurements and Evaluation by : Caterina Casavola
Download or read book New Challenges in Residual Stress Measurements and Evaluation written by Caterina Casavola and published by BoD – Books on Demand. This book was released on 2020-07-22 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Residual stresses (RS) are stresses present inside materials even in the absence of any applied load. They are of capital importance because they can impact greatly on the mechanical strength of the material, on its dimensional correspondence to design specifications as well as on the fatigue life of the part. RS measurement and evaluation is currently an important research topic where a lot of challenges still need to be addressed. This book aims to provide the reader with an overview of the principal novelties in this field including current limitations and potential future developments. Both radically new experimental approaches as well as recent evolutions of consolidated ones will be presented, along with the latest novelties in the area of numerical residual stress evaluation.
The residual stresses found in components are mainly due to thermal, mechanical and metallurgical changes of material. The manufacturing processes such as fabrication, assembly, welding, rolling, heat treatment, shot peening etc. generate residual stresses in material. A significant number of improvements for residual stress measurement techniques have occurred in last few decades. The needs of Digital Image Correlation (DIC) techniques from industry have been increasing, especially in micro- and nano-scale mechanical testing applications mainly due to its relative easy implementation and utilization. In this dissertation, new experimental and numerical methods have been carried out, using a 3D-DIC measurement system with hole drilling operations and Finite Element Analysis (FEA) models to successfully predict both uniform and non-uniform residual stresses in material. The residual stresses have been calculated based on the established governing equations, 3D-DIC measured deformations, and calibration coefficients determined by finite element analyses. This 3D-DIC measurement technique performed in a no contact approach can capture the full-field, high sensitivity and high accuracy in-plan and out-of-plan deformation simultaneously. it can be used for both industrial and lab environments. There are three main categories for residual stress evaluations and validations in this dissertation. They are listed as following: 1) Through hole drilling (THD) on thin parts for uniform residual stresses; 2) Blind hole drilling (BHD) on thick parts for uniform residual tresses, where it is not possible to drill a through hole; 3) Incremental blind hole drilling (IBHD) on thick parts for non-uniform residual stresses which vary as a function of depth.
Book Synopsis Development of Digital Image Correlation Technique Applied to Hole Drilling Residual Stress Measurement by :
Download or read book Development of Digital Image Correlation Technique Applied to Hole Drilling Residual Stress Measurement written by and published by . This book was released on 2015 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: The residual stresses found in components are mainly due to thermal, mechanical and metallurgical changes of material. The manufacturing processes such as fabrication, assembly, welding, rolling, heat treatment, shot peening etc. generate residual stresses in material. A significant number of improvements for residual stress measurement techniques have occurred in last few decades. The needs of Digital Image Correlation (DIC) techniques from industry have been increasing, especially in micro- and nano-scale mechanical testing applications mainly due to its relative easy implementation and utilization. In this dissertation, new experimental and numerical methods have been carried out, using a 3D-DIC measurement system with hole drilling operations and Finite Element Analysis (FEA) models to successfully predict both uniform and non-uniform residual stresses in material. The residual stresses have been calculated based on the established governing equations, 3D-DIC measured deformations, and calibration coefficients determined by finite element analyses. This 3D-DIC measurement technique performed in a no contact approach can capture the full-field, high sensitivity and high accuracy in-plan and out-of-plan deformation simultaneously. it can be used for both industrial and lab environments. There are three main categories for residual stress evaluations and validations in this dissertation. They are listed as following: 1) Through hole drilling (THD) on thin parts for uniform residual stresses; 2) Blind hole drilling (BHD) on thick parts for uniform residual tresses, where it is not possible to drill a through hole; 3) Incremental blind hole drilling (IBHD) on thick parts for non-uniform residual stresses which vary as a function of depth.
Book Synopsis Theoretical Analysis of the Hole Drilling Method Used for the Residual Stress Identification by : Karel Vítek
Download or read book Theoretical Analysis of the Hole Drilling Method Used for the Residual Stress Identification written by Karel Vítek and published by . This book was released on 2003 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
