Full Description

This report presents the results of an investigation concerning the general subject of the cracking of simple structural geometries under tensile loading.

Part 1 encompasses the general subject of the effect of edge conditions and includes a summary of the effects of flame-cut edge notches of various geometries, the effects of the transition details between the sheer strake and the fashion plate, and the effects of various practical procedures of plate edge preparation. For edge notched specimens, small differences were noted in transition temperature, whereas marked differences were noted in the strength and energy absorbing capacities of specimens of the various types. The results of tests of specimens designed to simulate the transition detail between the sheer strake and fashion plate emphasize the necessity of providing as smooth a transition as practicable from one structural component to another if benefits such as lower transition temperature and higher strengths are to be obtained. The effects of plate edge preparation at room temperature were of little significance to specimens tested at room temperature. However, large differences in tensile behavior, and particularly in energy absorbing capacity, were noted for various edge treatments at low temperatures.

Part 2 of this report is a summary of tests of interrupted longitudinal members. Transition temperature was the characteristic most notably varied by variations in the geometry of the free end details of the longitudinals. However, significant variations were shown in strength and energy absorbing capacity, and emphasis has been added to the importance of a smoothly curved ending.

Part 3 reports the tests on 3-in. wide by 40-in. long specimens having various fastening details at the mid-section. The details included drilled, punched, punched and reamed holes, or studs which were manually welded, automatically welded, or driven into the plate by an explosive charge. No major differences were noted in unit tensile strength for the specimens tested. However, an appreciable loss in specimen ductility was discernible in processes involving punching or other processes which cold work localized areas.

The effect of welding fixtures in close proximity on plates subjected to tensile loading was investigated and reported in Part 4. The specimens were 10-in. wide and 40-in. long with 3-in. wide by 2-in. long pads of 3/4-in. steel which were welded all around with 5/16-in. fillets made using E6010 electrodes. The results indicated that the distance between the two pads had little effect on tensile behavior.

Product Details

Published: 1955 Number of Pages: 30 File Size: 1 file , 1.9 MB