Accession Number : AD0449664


Title :   INVESTIGATION OF THE FRACTURE TOUGHNESS OF THICK PLATE METALLIC MATERIALS ASSIGNMENT 86 105 PHASE I,


Corporate Author : NAVY MARINE ENGINEERING LAB ANNAPOLIS MD


Personal Author(s) : Skalican, A J


Report Date : 09 Oct 1964


Pagination or Media Count : 9


Abstract : The effect of notched-bend specimen thickness in determining the plane-strain fracture toughness, and the nominal notch-bend strength, of aluminum 7079-T6 alloy was studied. Particular attention was given to the ability of rectangular beams to predict the results for square beams of equal beam depth. It is concluded /hat in the absence of pop-in, a specimen thickness of one-half the beam depth or greater is required. If pop-in is discernable and the pop-in stress is used, a thickness of onequarter the depth or greater is required. This information is significant in evaluating the fracture toughness of thick sections when only plate of lesser thickness is available. A future phase of the investigation will determine the ability of rectangular notched beams to establish the size effect in a material exhibiting a transition from quasi-ductile to frangible behavior at sizes greater than the available plate thickness. (Author)


Descriptors :   *BEAMS(STRUCTURAL) , MECHANICAL PROPERTIES , ALUMINUM ALLOYS , FRACTURE(MECHANICS) , THICKNESS , MEASUREMENT , LOADS(FORCES) , DEFLECTION , TOUGHNESS


Distribution Statement : APPROVED FOR PUBLIC RELEASE