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Author: Yuanli Bai Publisher: ISBN: Category : Languages : en Pages : 262
Book Description
The effect of Lode angle parameter, or the third deviatoric stress invariant, on plasticity and fracture is studied using flat-grooved transverse plane strain specimens. A generalized asymmetric plasticity model for isotropic materials with both pressure and Lode angle dependence is developed. Calibration method of the plasticity model is discussed in detail. Test results on 2024-T351 aluminum alloy confirmed the proposed plasticity model. Similarly, a generalized asymmetric 3D empirical fracture locus with six free parameters is proposed. The proposed fracture locus, which depends on both stress triaxiality (or pressure) and the Lode angle parameter, is calibrated using two types of methods: classical specimens under uniaxial testing, and the newly designed butterfly specimens under biaxial testing. Experimental results on 2024-T351 aluminum alloy, 1045 steel, and A710 steel validated the proposed 3D fracture locus. A concept of forming severity is introduced to study the loading history effect on metal forming limit diagram (FLD). Given the necking locus under proportional loading conditions, and using a non-linear accumulation rule of forming severity index, the proposed model well predicts the FLDs under different pre-loading conditions. As an extension of the ductile fracture locus defined and calibrated under proportional loading conditions, a new damage accumulation rule considering the loading history effect is proposed. The new model uses the accumulated difference between directions of the back stress tensor and the current stress tensor to describe the non-proportionality of a load path. Several types of tests with complex loading histories were designed and performed to study the loading history effect on ductile fracture. Extensive experimental studies on 1045 steel confirmed the proposed ductile fracture model. The proposed model is successfully applied to predict fracture of crushed prismatic tubes undergoing strain reversal.
Author: Yuanli Bai Publisher: ISBN: Category : Languages : en Pages : 262
Book Description
The effect of Lode angle parameter, or the third deviatoric stress invariant, on plasticity and fracture is studied using flat-grooved transverse plane strain specimens. A generalized asymmetric plasticity model for isotropic materials with both pressure and Lode angle dependence is developed. Calibration method of the plasticity model is discussed in detail. Test results on 2024-T351 aluminum alloy confirmed the proposed plasticity model. Similarly, a generalized asymmetric 3D empirical fracture locus with six free parameters is proposed. The proposed fracture locus, which depends on both stress triaxiality (or pressure) and the Lode angle parameter, is calibrated using two types of methods: classical specimens under uniaxial testing, and the newly designed butterfly specimens under biaxial testing. Experimental results on 2024-T351 aluminum alloy, 1045 steel, and A710 steel validated the proposed 3D fracture locus. A concept of forming severity is introduced to study the loading history effect on metal forming limit diagram (FLD). Given the necking locus under proportional loading conditions, and using a non-linear accumulation rule of forming severity index, the proposed model well predicts the FLDs under different pre-loading conditions. As an extension of the ductile fracture locus defined and calibrated under proportional loading conditions, a new damage accumulation rule considering the loading history effect is proposed. The new model uses the accumulated difference between directions of the back stress tensor and the current stress tensor to describe the non-proportionality of a load path. Several types of tests with complex loading histories were designed and performed to study the loading history effect on ductile fracture. Extensive experimental studies on 1045 steel confirmed the proposed ductile fracture model. The proposed model is successfully applied to predict fracture of crushed prismatic tubes undergoing strain reversal.
Author: Ernest Baker Publisher: DEStech Publications, Inc ISBN: 1605950521 Category : Science Languages : en Pages : 2230
Book Description
Includes papers that were first presented at a September 2011 conference organized by the National Defense Industrial Association and the International Ballistics Society. This title includes a CD-ROM that displays figures and illustrations in articles in full color along with a title screen and main menu screen.
Author: Stephane Jean Marie Marcadet Publisher: ISBN: Category : Languages : en Pages : 78
Book Description
Advanced high strength steel sheets are rapidly entering the transport industry, as their high strength to weight ratio helps improving fuel and costs efficiency. The early ductile fracture of these materials limits their formability and crash-worthiness. A phenomenological criterion to predict ductile fracture has been developed based on a law of damage accumulation weighted by the stress state. The calibration of such a model requires accurate measurements of the history of stress and strain state up to the onset of fracture. The phenomenon of localized necking occurs prior to ductile fracture in most types of loading of sheet metal. In order to measure the local state of stress and strain, a hybrid experimental and numerical method is tested. The Finite Element model can accurately predict the load displacement relation using a quadratic Hill 48 yield surface and an associated flow rule. The evolution of the local stresses and strains in the material are found to be non linear after necking. Results of such a method to calibrate the fracture criterion provide a validation of the model in a large range of loadings, including uniaxial, biaxial and shear. The effect of a reverse loading is then explored by developing an innovative experimental procedure to adapt the hybrid method for in plane compression followed by uniaxial tension of sheet metal. An Anti Buckling Device (ABD) and special grips are developed to delay buckling of the sheet. The hybrid method requires an accurate constitutive model of the material in the case of reverse loading for the Finite Element model. A modified Yoshida hardening called IH + LK + LNK combining isotropic hardening, linear and non linear kinematic hardening provides good prediction of the load displacement relation. An analysis of the history of local stresses and strains up to the onset of fracture suggests that limited damage is accumulated during the compression phase, validating the phenomenological model.
Author: Liang-Jiu Jia Publisher: Springer ISBN: 9811326614 Category : Science Languages : en Pages : 231
Book Description
This book presents experimental results and theoretical advances in the field of ultra-low-cycle fatigue failure of metal structures under strong earthquakes, where the dominant failure mechanism is ductile fracture. Studies on ultra-low-cycle fatigue failure of metal materials and structures have caught the interest of engineers and researchers from various disciplines, such as material, civil and mechanical engineering. Pursuing a holistic approach, the book establishes a fundamental framework for this topic, while also highlighting the importance of theoretical analysis and experimental results in the fracture evaluation of metal structures under seismic loading. Accordingly, it offers a valuable resource for undergraduate and graduate students interested in ultra-low-cycle fatigue, researchers investigating steel and aluminum structures, and structural engineers working on applications related to cyclic large plastic loading conditions.
Author: The Minerals, Metals & Materials Society (TMS) Publisher: John Wiley & Sons ISBN: 1119093481 Category : Technology & Engineering Languages : en Pages : 1584
Book Description
The TMS 2015 Annual Meeting Supplemental Proceedings is a collection of papers from the TMS 2015 Annual Meeting & Exhibition, held March 15-19 in Orlando, Florida, USA. The papers in this volume represent 33 symposia from the meeting. This volume, along with the other proceedings volumes published for the meeting, and archival journals, such as Metallurgical and Materials Transactions and Journal of Electronic Materials, represents the available written record of the 73 symposia held at TMS2015. This proceedings volume contains both edited and unedited papers; the unedited papers have not necessarily been reviewed by the symposium organizers and are presented "as is." The opinions and statements expressed within the papers are those of the individual authors only, and no confirmations or endorsements are intended or implied.
Author: David W. Dempster Publisher: Academic Press ISBN: 0128130741 Category : Science Languages : en Pages : 1950
Book Description
Marcus and Feldman's Osteoporosis, Fifth Edition, is the most comprehensive, authoritative reference on this disease. Led by a new editorial team, this fifth edition offers critical information on reproductive and hormonal risk factors, new therapeutics, ethnicity, nutrition, therapeutics, management and economics, comprising a tremendous wealth of knowledge in a single source not found elsewhere. Written by renowned experts in the field, this two-volume reference is a must-have for biomedical researchers, research clinicians, fellows, academic and medical libraries, and any company involved in osteoporosis drug research and development. Summarizes the latest research in bone biology and translational applications in a range of new therapeutic agents, including essential updates on therapeutic uses of calcium, vitamin D, SERMS, bisphosphonates, parathyroid hormone, and new therapeutic agents Recognizes the critical importance of new signaling pathways for bone health, including Wnt, OPG and RANK, of interest to both researchers who study bone biology and clinicians who treat osteoporosis Offers new insights into osteoporosis associated with menopause, pre-menopause, chronic kidney disease, diabetes, HIV and other immune disorders
Author: William F. Hosford Publisher: Cambridge University Press ISBN: 113949743X Category : Technology & Engineering Languages : en Pages : 345
Book Description
This book helps the engineer understand the principles of metal forming and analyze forming problems - both the mechanics of forming processes and how the properties of metals interact with the processes. In this fourth edition, an entire chapter has been devoted to forming limit diagrams and various aspects of stamping and another on other sheet forming operations. Sheet testing is covered in a separate chapter. Coverage of sheet metal properties has been expanded. Interesting end-of-chapter notes have been added throughout, as well as references. More than 200 end-of-chapter problems are also included.
Author: Tetsuo Okada Publisher: Springer Nature ISBN: 981154672X Category : Technology & Engineering Languages : en Pages : 855
Book Description
This book gathers the peer-reviewed proceedings of the 14th International Symposium, PRADS 2019, held in Yokohama, Japan, in September 2019. It brings together naval architects, engineers, academic researchers and professionals who are involved in ships and other floating structures to share the latest research advances in the field. The contents cover a broad range of topics, including design synthesis for ships and floating systems, production, hydrodynamics, and structures and materials. Reflecting the latest advances, the book will be of interest to researchers and practitioners alike.
Author: Yuanli Bai
Author: Yuanli Bai
Author: Ernest Baker
Author: Stephane Jean Marie Marcadet
Author: Liang-Jiu Jia
Author: The Minerals, Metals & Materials Society (TMS)
Author: David W. Dempster
Author: The Minerals, Metals & Materials Society (TMS)
Author: William F. Hosford
Author: Tetsuo Okada
Author: Derreck Georges Alexander Van Gelderen