Accession Number : ADA140381

Title :   Dynamic Fracture Behavior of Structural Materials.

Descriptive Note : Annual rept. no. 3, Feb 83-Feb 84,

Corporate Author : SRI INTERNATIONAL MENLO PARK CA

Personal Author(s) : Shockey,D A ; Giovanola,J H

PDF Url : ADA140381

Report Date : Mar 1984

Pagination or Media Count : 17

Abstract : Structures used by the U.S. Air Force must be designed to resist catastrophic fracture when subjected to dynamic loads. For example, aircraft components may experience short stress pulses from airborne debris, military projectiles, or intense bursts of laser or x-ray radiation. Landing gear and aircraft retaining cables on carrier ships experience dynamic loads at the end of each flight. A related dynamic fracture problem concerns rapdily running cracks. For example, it is often desirable to know whether a crack, once initiated, will arrest before it reaches a component boundary and thereby preserve the integrity of the structure. Thus, to ensure safe design of Air Force structures, it is necessary to have a knowledge of the dynamic fracture behavior of the component materials. The research being conducted in this program is aimed at improving our understanding of dynamic fracture. Emphasis is on the accurate characterization of material resistance to crack initiation under dynamic loading (K sub Id measurements) and to rapid crack propatation (K sub Id measurements). This annual report reviews the specific program objectives and summarizes the progress during the third research year.

Descriptors :   *Alloys, *Crack propagation, *Fracture(Mechanics), *Charpy impact tests, *Fatigue(Mechanics), *Structural properties, Dynamic loads, Toughness, Stability, Cadmium compounds, Cadmium sulfides, Construction materials, Thin films, Substrates, Tensile properties, Temperature, Light pulses, Lasers

Subject Categories : Metallurgy and Metallography
      Test Facilities, Equipment and Methods
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE