Prediction of stable crack growth using continuum damage mechanics

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:175365

Moyer, Jr, E T; McCoy, H ^[1]; Sarkani, S ^[2]

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1. NKF Engineering, Inc., Arlington, VA (United States)
2. George Washington Univ., Washington, DC (United States)

The purpose of this paper is to investigate the application of Continuum Damage Mechanics (CDM) to the description of stable crack propagation and unstable fracture in engineering metals. In this paper, monotonic loading in two-dimensional specimens is considered. A finite element program was developed to compute the stress and strain state in the specimens including the effects of finite deformations and strains. Damage is computed as a continuous, evolutionary process in the code and the growth of damage is reported. The ability of continuum damage to predict the stable propagation of cracks is validated with existing experimental data. This validated approach is used to consider the extremes of the local stress state: plane stress and plane strain. To examine the potential for application of CDM to complex structures, a computational regridding scheme which minimizes the required number of degrees of freedom was developed, studied and validated.

• OSTI ID: 175365
• Report Number(s): CONF-950686--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
99 GENERAL AND MISCELLANEOUS
CRACK PROPAGATION
DEFORMATION
FINITE ELEMENT METHOD
METALS
STRAINS
STRESSES