Review of Concepts and Status of Procedures for Fracture-safe Design of Complex Welded Structures Involving Metals of Low to Ultrahigh Strength Levels

Review of Concepts and Status of Procedures for Fracture-safe Design of Complex Welded Structures Involving Metals of Low to Ultrahigh Strength Levels
Author:
Publisher:
Total Pages: 89
Release: 1965
Genre:
ISBN:
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The report presents integrated analyses and substantiating data on problems of metallurgical optimization and solutions to fracture-safe design and fabrication of large welded structures, utilizing high strength metals. The apparent complexities of attaining practical engineering use of high strength metals derive primarily from lack of appreciation of the close interrelationships that exist between the intrinsic susceptibilities of these metals to various failure modes and the intrinsic structural mechanics features of the structures. Metals of high intrinsic resistance to failure may be matched to structures of high intrinsic design complexity and ordinary fabrication techniques with assurance of structural safety. Metals of low intrinsic resistance to failure must be matched only to structures that are exactly stress analyzable and thereby are restricted to designs of the utmost attainable simplicity and to fabrication by techniques of utmost attainable simplicity and to fabrication by techniques of utmost precision.

Engineering Fracture Design

Engineering Fracture Design
Author: H. Liebowitz
Publisher: Academic Press
Total Pages: 472
Release: 2014-05-10
Genre: Technology & Engineering
ISBN: 1483273288
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Fracture: An Advanced Treatise, Volume IV: Engineering Fracture Design presents the development and status of knowledge on sudden, catastrophic failure of structures due to unexpected brittle fracture of component materials. This book provides information pertinent to the engineering fracture design as well as the microscopic and macroscopic fundamentals of fracture. Organized into eight chapters, this volume begins with an overview of the evaluation of fracture tests. This text then presents an analysis of temperature effects on fracture. Other chapters consider the fracture and carrying capacity of long, slender columns and related topics. This book discusses as well the problems in connection with columns, beams, and plates, and experimental evidence to support theories proposed for describing the strength and stiffness of these elements. The final chapter presents an analysis of the problem of brittle fracture in weldments. This book is a valuable resource for engineers, students, and research workers in industrial organizations, education and research institutions, and various government agencies.

Welding High-strength Steels

Welding High-strength Steels
Author: P. A. Kammer
Publisher:
Total Pages: 68
Release: 1966
Genre: Martensitic stainless steel
ISBN:
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Recent studies of the developments in welding steels with yield strengths greater than 150 ksi have included low-alloy martensitic steels, medium-alloy martensitic steels, nickel maraging steels, and bainitic steels. Only weldments from medium-alloy martensitic steels and nickel maraging steels have mechanical properties approaching those of the base plate without a complete postweld heat treatment. The most serious problem with the other steel is low toughness in the weld fusion zone. Adequate weld metal toughness under conditions of elastic strain can be obtarined over the entire 150 to 225 ksi yield-strength range only if the tungsten-arc welding process is used. Processes with higher deposition rates can produce comparable weld deposits only in the lower portion of the range. Above a yield strength of 200 ksi, 18Ni maraging steel weldments have the best combination of strength and toughness. Below 200 ksi, the HP 9-4-25 medium-alloy martensitic steel and 12Ni maraging steel weldments have nearly equal properties.

Impact Testing of Metals

Impact Testing of Metals
Author: Symposium on Impact Testing of Metals
Publisher: ASTM International
Total Pages: 323
Release: 1984
Genre: Impact
ISBN: 9780803100381
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Fracture Toughness Characteristics of the New Weldable Steels of 180- to 210-Ksi Yield Strengths

Fracture Toughness Characteristics of the New Weldable Steels of 180- to 210-Ksi Yield Strengths
Author: Peter P. Puzak
Publisher:
Total Pages: 36
Release: 1969
Genre: Steel
ISBN:
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The yield strength range for steels from 180 to 210 ksi is currently covered by four weldable alloys of the following nominal chemical analysis: 18%Ni-8%Co-3%Mo maraging steel, 12%Ni-5%Cr-3%Mo maraging steel, 9%Ni-4%Co-0.20%C quenched and tempered (Q and T) steel, and 10%Ni-8%Co-2%Cr-1%Mo-0.10%C Q and T steel. Broad ranges of fracture resistance have been reported for these materials based on various fracture tests, and this report presents information for material selection and design guidance by providing an analysis of the interactions between the metallurgical and mechanical parameters that contribute to the fracture resistance of plate products. Definitions of the interaction between the metallurgical and the mechanical aspects are developed with the use of the Dynamic Tear (DT) test and the Ratio Analysis Diagram (RAD). (Author).