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This volume is a collection of the papers presented at the 20th meeting of the JANNAF Structures and Mechanical Behavior Subcommittee. The meeting was held 1-3 November 1983 at The Johns Hopkins University/Applied Physics Laboratory in Laurel, Maryland. The subjects covered in the presentations included various aspects of rocket- and gun-propulsion systems technology, as follows: material property and characterization, structural analysis, and service life.
A five-volume collection of technical papers presented at the April 1994 conference. Some 350 papers are arranged by subjects including: rotorcraft dynamics; structural qualification/verification; finite element methods; buckling and postbuckling of curved panels and shells; advanced structural appl
Traditionally the vast majority of materials characterization techniques have been destructive, e. g. , chemical compositional analysis, metallographic determination of microstructure, tensile test measurement of mechanical properties, etc. Also, traditionally, nondestructive techniques have been used almost exclusively for the detection of macroscopic defects, mostly cracks, in structures and devices which have already been constructed and have already been in service for an extended period of time. Following these conventional nondestructive tests, it has been common practice to use somewhat arbitrary accept-reject criteria to decide whether or not the structure or device should be removed from service. The present unfavorable status of a large segment of industry, coupled with the desire to keep structures in service well past their original design life, dramatically show that our traditional approaches must be drastically modified if we are to be able to meet future needs. The role of nondestructive characterization of materials is changing and will continue to change dramatically. It has become increasingly evident that it is both practical and cost effective to expand the role of nondestructive evaluation to include all aspects of materials' production and application and to introduce it much earlier in the manufacturing cycle. In fact, the recovery of a large portion of industry from severe economic problems is dependent, in part, on the successful implementation of this expanded role.