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Author: Publisher: ISBN: Category : Languages : en Pages : 49
Book Description
A mismatched welded component exists when the strength of the weld material is different than the strength of the base material. This research has examined the effect of weld joint geometry and mismatch level on the strength and fracture performance of high strength steel weld components. Fracture performance was studied only for applied three-point bending loading. Eleven different welded systems were constructed with mismatch ranging between -36% to +47% and various weld joint profiles to sculpt fusion zone widths between 2 and 13 mm at the crack tip. Instrumented tensile tests were utilized to characterize weldment strength behavior while single edge notch bend J-R curve testing of short (a/W = 0.15) and deeply (a/W = 0.5) cracked specimens was conducted to measure both baseline weld metal toughness properties and determine the fracture performance of mismatched systems. The results indicate that contact strengthening in unflawed specimens occurs to a greater degree and at lower constraint in conventional undermatched weldments. Flawed undermatched performance under bending loads is highly dependent on the fusion zone width as well while the degree of mismatching is a secondary effect. As the zone width decreases, the apparent tearing resistance also decreases. The overall performance of undermatched systems, however, can still be better than overmatched systems when the inherent toughness of the overmatching weld metal consumable is poor. (MM).
Author: Publisher: ISBN: Category : Languages : en Pages : 49
Book Description
A mismatched welded component exists when the strength of the weld material is different than the strength of the base material. This research has examined the effect of weld joint geometry and mismatch level on the strength and fracture performance of high strength steel weld components. Fracture performance was studied only for applied three-point bending loading. Eleven different welded systems were constructed with mismatch ranging between -36% to +47% and various weld joint profiles to sculpt fusion zone widths between 2 and 13 mm at the crack tip. Instrumented tensile tests were utilized to characterize weldment strength behavior while single edge notch bend J-R curve testing of short (a/W = 0.15) and deeply (a/W = 0.5) cracked specimens was conducted to measure both baseline weld metal toughness properties and determine the fracture performance of mismatched systems. The results indicate that contact strengthening in unflawed specimens occurs to a greater degree and at lower constraint in conventional undermatched weldments. Flawed undermatched performance under bending loads is highly dependent on the fusion zone width as well while the degree of mismatching is a secondary effect. As the zone width decreases, the apparent tearing resistance also decreases. The overall performance of undermatched systems, however, can still be better than overmatched systems when the inherent toughness of the overmatching weld metal consumable is poor. (MM).
Author: Pierpaolo Carlone Publisher: MDPI ISBN: 3039219545 Category : Technology & Engineering Languages : en Pages : 288
Book Description
The combination of distinct materials is a key issue in modern industry, whereas the driving concept is to design parts with the right material in the right place. In this framework, a great deal of attention is directed towards dissimilar welding and joining technologies. In the automotive sector, for instance, the concept of “tailored blanks”, introduced in the last decade, has further highlighted the necessity to weld dissimilar materials. As far as the aeronautic field is concerned, most structures are built combining very different materials and alloys, in order to match lightweight and structural performance requirements. In this framework, the application of fusion welding techniques, namely, tungsten inert gas or laser welding, is quite challenging due to the difference in physical properties, in particular the melting point, between adjoining materials. On the other hand, solid-state welding methods, such as the friction stir welding as well as linear friction welding processes, have already proved to be capable of manufacturing sound Al-Cu, Al-Ti, Al-SS, and Al-Mg joints, to cite but a few. Recently, promising results have also been obtained using hybrid methods. Considering the novelty of the topic, many relevant issues are still open, and many research groups are continuously publishing valuable results. The aim of this book is to finalize the latest contributions on this topic.
Author: Carlos Guedes Soares Publisher: CRC Press ISBN: 1351653415 Category : Technology & Engineering Languages : en Pages : 952
Book Description
Progress in the Analysis and Design of Marine Structures collects the contributions presented at MARSTRUCT 2017, the 6th International Conference on Marine Structures (Lisbon, Portugal, 8-10 May 2017). The MARSTRUCT series of Conferences started in Glasgow, UK in 2007, the second event of the series having taken place in Lisbon, Portugal in March 2009, the third in Hamburg, Germany in March 2011, the fourth in Espoo, Finland in March 2013, and the fifth in Southampton, UK in March 2015. This Conference series deals with Ship and Offshore Structures, addressing topics in the areas of: - Methods and Tools for Loads and Load Effects - Methods and Tools for Strength Assessment - Experimental Analysis of Structures - Materials and Fabrication of Structures - Methods and Tools for Structural Design and Optimisation, and - Structural Reliability, Safety and Environmental Protection Progress in the Analysis and Design of Marine Structures is essential reading for academics, engineers and all professionals involved in the design of marine and offshore structures.
Author: GP. Mercier Publisher: ISBN: Category : Constraint Languages : en Pages : 32
Book Description
Four weldments of varying levels of weld joint to baseplate strength (mismatch) were examined to determine the effects of this ratio on fracture performance. Cracks were placed within the weld metal at several ratios of weld fusion margin. This margin is defined as the ratio of crack tip proximity to the weld fusion line and crack length (Lcrk/a). Finite element studies were then performed on each variation of weld fusion margin and mismatch level to determine the crack driving force not accounted for in a typical fracture analysis, which assumes monolithic, homogenous weld metal specimens and ignores the weld/baseplate interaction. Assuming homogenous weld metal specimens results in crack growth resistance behavior that depends on crack tip proximity to the weld fusion line. Once local plasticity and the additional constraint caused by the weld/baseplate interface are included in the analysis, fracture behavior is independent of crack tip proximity to the fusion line up to and slightly beyond initiation. Errors in fracture toughness at weld fusion margins greater than or equal to 1.5 are less than 10% and can reasonably be ignored. Errors at smaller values of Lcrk/a are considerable, and effects of local plastic deformation and constraint must be accounted for in the fracture analysis. Furthermore, uncorrected estimates of initiation toughness (JIC) in specimens where the weld fusion margin are less than 1.5 result in overly conservative estimates. The percentage of weld mismatch was found not to be a major factor in determining either crack growth resistance or crack initiation behavior. An increased propensity toward unstable fracture was observed in specimens with smaller Lcrk/a ratios. This effect may be attributed to a local microstructural defect and requires further study.
Author: RL. Tregoning Publisher: ISBN: Category : Cracking resistance Languages : en Pages : 24
Book Description
A mismatched welded component exists when the strength of the weld material is different than the strength of the base material. This research examined the effect of weld joint geometry and the mismatch level on the strength and fracture performance of high-strength steel weld components. Eleven different welded systems were constructed with the mismatch ranging between -36% to +47% and various weld joint profiles to sculpt fusion zone widths between 2 and 13 mm at the crack tip. Instrumented tension tests were utilized to characterize weldment strength behavior, while single-edge bend J-R curve testing of short (a/W = 0.15) and deeply (a/W = 0.5) cracked specimens was conducted to measure both baseline weld metal toughness properties and to determine the fracture performance of mismatched systems. The results indicate that more contact strengthening occurs in beveled, structural undermatched weldments compared to straight-sided welds. Flawed undermatched performance is highly dependent on the fusion zone width as well, while the degree of mismatching is a secondary effect. As the zone width decreases, the apparent tearing resistance also decreases. The overall performance of undermatched systems, however, can still be better than overmatched systems hen the inherent toughness of the overmatching weld metal consumable is poor.
Author: Michael Zinigrad Publisher: MDPI ISBN: 3039367269 Category : Technology & Engineering Languages : en Pages : 294
Book Description
This book is a collection of state-of-the-art research works in the field of materials science. Specifically, the works deal with issues related to the welding, joining and coating of metallic materials. These methods are known as main processes in the field of metallurgy, and are usually applied in order to solve complex problems of joining metals or the fabrication of metallic surfaces with required properties and performance. The focus of this book is on metals such as aluminum, magnesium, titanium, various types of steel, intermetallics and shape memory alloys. These scientific works address microstructural evaluation, as well as the performance of the produced joints and coatings. Scientists from all over the globe have presented novel advances and possible solutions for metallic materials joints and coatings for applications in the automotive, aerospace, chemical and medical industries, among others.
Author: M. Jono Publisher: Elsevier ISBN: 1483294137 Category : Technology & Engineering Languages : en Pages : 3510
Book Description
Significant progress in the science and technology of the mechanical behaviour of materials has been made in recent years. The greatest strides forward have occurred in the field of advanced materials with high performance, such as ceramics, composite materials, and intermetallic compounds. The Sixth International Conference on Mechanical Behaviour of Materials (ICM-6), taking place in Kyoto, Japan, 29 July - 2 August 1991 addressed these issues. In commemorating the fortieth anniversary of the Japan Society of Materials Science, organised by the Foundation for Advancement of International Science and supported by the Science Council of Japan, the information provided in these proceedings reflects the international nature of the meeting. It provides a valuable account of recent developments and problems in the field of mechanical behaviour of materials.
Author: Gerald Mercier Publisher: ISBN: Category : Languages : en Pages : 58
Book Description
Four weldments of varying levels of weld joint to baseplate strength (mis-match) were examined to determine the effects of this ratio on fracture performance. Cracks were placed within the weld metal at several ratios of weld fusion margin. This margin is defined as the ratio of crack tip proximity to the weld fusion line and crack length (L(sub crk)/a). Finite element studies were then performed on each variation of weld fusion margin and mis-match level to determine the crack driving force not accounted for in a typical fracture analysis, which assumes monolithic, homogenous weld metal specimens and ignores the weld/baseplate interaction. Assuming homogenous weld metal specimens results in J-R curves that exhibit markedly different crack growth resistance behavior depending on crack tip proximity to the weld fusion line. Once local plasticity and the additional constraint caused by the weld/baseplate interface are included in the analysis, fracture behavior is independent of crack tip proximity to the fusion line up to and slightly beyond initiation. Errors in fracture toughness at weld fusion margins greater than or equal to 1.5 are less than 10% and can reasonably be ignored. Errors at smaller values of L(sub crk)/a are considerable, and effects of local plastic deformation and constraint must be accounted for in the fracture analysis. Furthermore, uncorrected estimates of initiation toughness (J(sub IC) in specimens where the weld fusion margin is less than 1.5 results in overly conservative estimates. The percentage of weld mis-match was found not to be a major factor in determining either crack growth resistance or crack initiation behavior. An increased propensity toward unstable fracture was observed in specimens with smaller L(sub crk)/a ratios. This effect may be attributed to a local microstructural defect and requires further study.
Author: 
Author: 
Author: Pierpaolo Carlone
Author: Carlos Guedes Soares
Author: GP. Mercier
Author: RL. Tregoning
Author: Michael Zinigrad 
Author: Robert S. Piascik
Author: Ravinder Chona
Author: M. Jono
Author: Gerald Mercier