Accession Number : AD0707717

Title :   A NEW METHOD OF REINFORCING A HOLE EFFECTING LARGE WEIGHT SAVINGS.

Descriptive Note : Final rept.,

Corporate Author : NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER WASHINGTON D C

Personal Author(s) : Dhir,Surendra K. ; Brock,Joseph S.

Report Date : MAY 1970

Pagination or Media Count : 23

Abstract : A new method of reinforcing a hole in a flat plate under uniaxial tension is proposed in which the reinforcing material is present on the boundary of the hole only in the regions containing high stresses. Since the reinforcement is discontinuous, its amount, which varies along the arcs of the hole, is represented by a Fourier series in the analysis of the stresses. The stresses are determined by the use of two complex potential functions in series form. The series are truncated at the point whereafter any additional terms do not produce any significant change in the magnitude of the stresses. Numerical values are given for the case of a circular hole with various types of reinforcements. Finally, it is shown that this type of reinforcement can effect approximately 60 to 70 per cent savings in weight along with a 30 to 35 per cent savings in the welding and about 10 per cent reduction in the maximum stress as compared to the conventional all around reinforcement. (Author)

Descriptors :   (*METAL PLATES, ORIFICES), (*ORIFICES, REINFORCING MATERIALS), STRESSES, LOADS(FORCES), GEOMETRIC FORMS, FOURIER ANALYSIS, SERIES(MATHEMATICS), WEIGHT, OPTIMIZATION

Subject Categories : Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE