REVIEW OF CONCEPTS AND STATUS OF PROCEDURES FOR FRACTURE-SAFE DESIGN OF COMPLEX WELDED STRUCTURES INVOLVING METALS OF LOW TO ULTRAHIGH STRENGTH LEVELS

Abstract
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.

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