Accession Number:

ADA242121

Title:

Stress Field Variations during Dynamic Loading

Descriptive Note:

Memorandum rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

Report Date:

1991-10-18

Pagination or Media Count:

23.0

Abstract:

An understanding of and the ability to analytically predict the stress and strain field ahead of a crack tip is an essential portion of understanding the fracture process. In the case of dynamic loading induced fracture, fracture may be divided into three broad categories 1 fracture caused by a single stress wave or a small number of stress wave interactions, 2 stress wave dominated fractures caused by the complex combinations of initial, refractive and reflective stress waves and 3 fractures which occur after the kinetic energy associated with stress wave interactions is negligible. The current work examines the fracture of a three point bend specimen of A517 steel which fails by stress wave dominated brittle fracture. The Mode I stress contours during the dynamic loading transient are examined in detail. Five distinct Mode I stress contour patterns caused by the continual interactions of stress waves with increasing time are observed to occur prior to fracture.

Subject Categories:

  • Metallurgy and Metallography
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE