Download or read book Dynamic Fracture Behavior of High Strength Pipeline Steel written by Sarath Chandran and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temperature Effects on Dynamic Fracture of Pipeline Steel written by Sourayon Chanda and published by . This book was released on 2015 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effective layout of pipelines for mass transportation of oil/gas is a major area of research in the present world. Due to fracture of pipelines, long-lasting and catastrophic hazards may be initiated. Hence, study of dynamic fracture of pipeline steel (PS) is a major research topic in pipeline industry. In many colder parts of the world, like northern Canada, the temperature varies from about -50°C in winter to +35°C in summer. Hence a thorough knowledge of the temperature dependent performance of PS is crucial for efficient design of pipelines. The present thesis aims to address this issue by studying the effects of temperature variation on dynamic fracture characteristics of PS. The present work aims to develop a temperature dependent cohesive zone model (CZM)-based finite element (FE) analysis to simulate drop weight tear test (DWTT). The primary work of this project is to identify the key CZM parameters that are affected by temperature variations and co-relate these parameters with known mechanical properties of PS. Based on these correlations, a temperature dependent cohesive zone model has been presented. To achieve this goal, the true stress strain behavior of pipeline steel have been represented by a modified form of Johnson & Cook model and a non-linear temperature dependency of fracture toughness for PS has been employed. The FE modeling of the CZM has been done using Abaqus/CAE 6.13. The model has been validated by comparing with the load-displacement curves from actual DWTT. The FE simulations of DWTT enable us to study the dynamic fracture behavior of PS at different temperatures. In this analysis, the time history of crack propagation for six different temperatures has been plotted. The obtained relationships show a region of steady-state crack growth during which toughness parameters like crack tip opening angle (CTOA) and crack tip opening displacement (CTOD) remain almost constant. This observation corresponds to experimental findings in this area. Further, the steady state energy from load-displacement curve seems to decrease steeply with decrease in temperature. The steady state toughness parameters like CTOA and CTOD have been obtained for each simulation. These toughness parameters were found to exhibit an increase with increase in temperature which can be formulated using an exponential relation. These results are consistent with temperature variation of experimentally determined CTOD values for steel reported in the literature. In short, the present thesis reports a simple but holistic approach to analyze the fracture behavior of PS at varying temperature using a temperature dependent CZM-based FE model.
Download or read book Dynamic Fracture Behavior of a Structural Steel written by K. Cho and published by . This book was released on 1990 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture experiments are described in which stress wave loading is employed to attain a stress intensity rate of about 2 • 106 MPa ?m/s. The specimens consisted of prefatigued notched round bars of a high strength, low alloy martensitic steel. The tests covered the temperature range -150°C to 200°C. Comparison is made with corresponding results of quasistatic tests on specimens of the same geometry as well as with results of other investigators who tested similar steels. The present steel contains manganese sulfide inclusions in the form of stringers and globules. Their role in the fracture process is examined by optical and scanning electron microscopy.
Download or read book The Factors Influencing the Fracture Characteristics of High strength Steel written by Charles W. Marschall and published by . This book was released on 1961 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanics and Mechanisms of Fracture written by Alan F. Liu and published by ASM International. This book was released on 2005-01-01 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic Fracture of High Strength Steel written by Ian M. Fyfe and published by . This book was released on 1987 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ductile failure under a variety of loading conditions is examined in order to assess the importance of inertia, precompression and mean tensile stress on the failure process. A number of plastic instability concepts are also examined with regard to their ability to provide generality to failure criteria based on void nucleation and growth concepts. It was determined that inertia plays an importance role in localization and can dramatically inhibit the necking process. Precompression appears to be relatively unimportant, unless the material is very highly strain-rate sensitive. It was determined that a viable void volume fraction failure criteria can be established which is applicable over a wide range of impact conditions if the nucleation strains dependence on the mean tensile stress is incorporated in the theory. Keywords: Dynamic fracture; Fracture mechanics; Metal fatigue; Physical metallurgy.
Download or read book A Comparative Study of the Effect of Low Temperature on the Fracture Toughness and Cyclic Properties of Two Candidate High Strength Low Alloy Steels for Arctic Pipeline Applications written by MR. Krishnadev and published by . This book was released on 1981 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because of the need for a better understanding of the effect of Arctic low temperature environments on the mechanical behavior of high-strength low-alloy (HSLA) steels, a comparative study has been undertaken to evaluate the effect of low temperature on the mechanical properties of two candidate steels, columbium-molybdenum "acicular ferrite" HSLA steel and high-columbium HSLA steel. The paper presents the data relating to the effect of low temperature on the mechanical properties, namely, dynamic fracture toughness KId properties, through instrumented impact testing of precracked Charpy V-notch samples and cyclic properties of the two steels. It also discusses the results in terms of their significance to material specification, selection, and performance criteria for safe and economical transportation of petroleum resources from the Canadian Arctic.
Download or read book Fracture Behavior Under Impact written by J. F. Kalthoff and published by . This book was released on 1986 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physical behavior of cracks under impact loading is investigated. Single edge cracks or arrays of multiple cracks are considered. The specimens are loaded by time dependent tensile stress pulses moving perpendicular to the crack direction. The specimens are directly loaded by an impinging projectile or by base plate which is accelerated by a projectile. The specimens are made from a transparent model material, Araldite B, or a high strength steel, X2 NiCoMo 18 9 5. The initial crack lengths and impact velocities are varied throughout the experiments. By means of the shadow optical method of caustics in combination with high speed photography, the dynamic stress intensity factors at the tip of the crack are measured as functions of time during the impact event. In particular the critical value of the dynamic stress intensity factor at onset of rapid crack propagation, i.e. the dynamic fracture toughness KId, is determined and discussed with regard to the time tf at which the crack becomes unstable.
Download or read book Interpretation of Dynamic Fracture Behavior Using Elastic viscoplastic Models written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper documents important analysis developments in crack-arrest studies underway in the Heavy-Section Steel Technology (HSST) Program under sponsorship of the US Nuclear Regulatory Commission. The HSST program addresses light-water reactor (LWR) pressure vessel integrity under accident scenarios, including pressurized-thermal-shock events.
Download or read book Fracture Toughness Testing and Its Applications written by ASTM Committee E-24 Staff and published by ASTM International. This book was released on 1981-10 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Using Small Specimens to Measure Dynamic Fracture Properties of High Toughness Steels written by H. Conque and published by . This book was released on 1992 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of coupled pressure bars (CPB) to induce dynamic fracture in tough materials using small specimens is investigated. CPB experiments were performed with a nuclear pressure vessel steel, A533 Grade B Class 1, over the temperature range 37 to 100°C. The dynamic fracture initiation toughness at a stress intensity loading rate, KI, of 2 x 106 MPa•m1⁄2 s-1 was deduced from the simulation of the fracture experiment with a dynamic viscoplastic finite-element fracture code. At 100°C, no cleavage fracture was observed for either dynamic crack initiation or subsequent propagation and arrest. A procedure to measure initiation, propagation, and arrest toughnesses of nuclear pressure vessel steels up to service temperature with CPB specimens is introduced.
Download or read book Exploratory Study of the Dynamic Fracture Ductility of TRIP and 300M Steels written by Volker Weiss and published by . This book was released on 1979 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: High stress transformation plasticity offers a means of increasing the strength as well as the ductility and toughness of steels. The additional energy absorption associated with the martensitic transformation during deformation is responsible for the enhanced fracture toughness. Prior studies at Syracuse University have shown that the martensite content at fracture is a function of the test temperature and that the notch toughness is strongly temperature dependent. Gold and Koppenaal have reported that TRIP steel exhibited embrittlement at a specific strain rate and testing temperature. The studies by Azrin et al., Weiss et al. and Zackay et al. have shown that an optimum combination of strength, toughness and fatigue crack growth resistance required careful control of austenite metastability with respect to the service condition. For example, a TRIP steel that exhibits high strength and toughness under relatively low strain rates at room temperature may suffer a significant loss of uniform ductility at very high strain rates. Also the same TRIP steel may be inferior in fatigue crack propagation resistance to an ultra high strength material.
Download or read book Dynamic Fracture Toughness Measurements in X70 X80 Steels written by Jason William Reinhart and published by . This book was released on 2003 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of ICF International Symposium on Fracture Mechanics Beijing written by and published by VSP. This book was released on 1983-12 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains 132 selected papers presented at the Symposium which will be held on November 22-25, 1983 in Beijing and is the first of international symposia on fracture mechanics held in China. In this volume one may find the contributions of many internationally well known scientists and engineers is the field of fracture mechanics. Among the 132 papers from 12 countries and regions, 16 are invited lectures which were specially chosen to cover major trends in fracture mechanics and were prepared by specialists actively engaged on the respective subjects. All papers are grouped under the 6 headings, that is, 1. Elastic and elastic-plastic fracture mechanics; 2. Applications of fracture mechanics; 3. Test methods; 4. Fatigue; 5. Fracture models and micro-mechanisms and 6. Fracture of non-metals. 70 papers are from Chinese contributors. It is the first time that Chinese scientists and engineers working on this field presented their studies to the outside world in such a large number and wide range of topics. Anyone interested in fracture mechanics may find in this volume the recent advances in this field. Anyone interested in the development in China may find in this volume the state of the art of fracture mechanics studies in China. This proceedings may serve also as a reference book for engineers, applied mathematicians, metallurgists, physicists and other scientists, as well as graduate students and undergraduate students. There are approximately 1,100 pages.
Download or read book Monotonic and Ultra Low Cycle Fatigue Behaviour of Pipeline Steels written by António Augusto Fernandes and published by Springer. This book was released on 2018-06-15 with total page 525 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the development of innovative computational methodologies for the simulation of steel material fracture under both monotonic and ultra-low-cycle fatigue. The main aspects are summarised as follows: i) Database of small and full-scale testing data covering the X52, X60, X65, X70 and X80 piping steel grades. Monotonic and ULCF tests of pipe components were performed (buckled and dented pipes, elbows and straight pipes). ii) New constitutive models for both monotonic and ULCF loading are proposed. Besides the Barcelona model, alternative approaches are presented such as the combined Bai-Wierzbicki-Ohata-Toyoda model. iii) Developed constitutive models are calibrated and validated using experimentally derived testing data. Guidelines for damage simulation are included. The book could be seen as a comprehensive repository of experimental results and numerical modeling on advanced methods dealing with Ultra Low Cycle Fatigue of Pipelines when subjected to high strain loading conditions.
Download or read book Advances in Fracture Research Brittle fracture Ductile fracture Dynamic fracture written by and published by . This book was released on 1989 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Behavior of High strength Plate Steels Containing Microstructural Gradients written by Angele Sjong and published by . This book was released on 2003 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
