Accession Number : AD0635785

Title :   A STUDY OF PLASTIC DEFORMATION AND FRACTURING BY STRAIN ENERGY DISTRIBUTION. INTERNALLY-NOTCHED STEEL PLATES UNDER TENSION.

Descriptive Note : Progress rept.

Corporate Author : SWARTHMORE COLL PA

Personal Author(s) : Liu, S. I. ; Carpenter,Samuel T.

Report Date : 20 DEC 1950

Pagination or Media Count : 45

Abstract : This investigation was conducted to study the plastic deformation and fracturing of 12in. wide, 3/4in. thick internally notched steel plates under axial tension by determining the strain energy distribution on the surface of the deformed regions of the plates. Several stages in the process of deformation and fracturing at 70F and 10F were investigated to maximum load, 70F being above the transition temperature, and 10F being below the transition temperature. Surface strain energy distribution across the crack was also determined for a specimen fractured ductilely at 70F. The results of this investigation show that the total energy based on octahedral theory and the above-stated assumptions agrees very well with the total observed energy input; that the rate of propagation of plastic deformation with respect to energy input decreases with decreasing temperature; that, for specimens with two dimensional similarity and constant thickness, the total energy of individual specimens of varying width can be predicted by the strain energy distribution of a single specimen of proper width; and that, at room temperature, the unit strain energy at the crack is found to be approximately in the order of 30,000 in-lbs per cubic inch in a ductile specimen. (Author)

Descriptors :   (*SHIP PLATES, STEEL), (*STEEL, FRACTURE(MECHANICS)), DEFORMATION, SHIP HULLS, STRAIN(MECHANICS), THEORY

Subject Categories : Metallurgy and Metallography
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE