SYMPOSIA PAPER Published: 01 January 1979
STP35829S

A Numerical Investigation of Plane Strain Stable Crack Growth Under Small-Scale Yielding Conditions

Source

Plane strain crack advance under small-scale yielding conditions in elastic-perfectly plastic and power-law hardening materials is investigated numerically via the finite element method. Results indicate that the stress distribution ahead of a growing crack is essentially the same as that ahead of a stationary crack, and that the numerically evaluated steady-state crack tip profiles reflect a vertical tangent at the extending crack tip which corresponds to the theoretically predicted outline. It is found that the increment dδt in crack tip opening, when loads are increased at fixed crack length, seems to be uniquely related to dJo irrespective of the amount of previous crack growth, and for increments dl of crack advance at constant external load, the incremental crack tip opening appears related to ln (Jor) dl when evaluated at distance r from the tip. A discussion of proposed fracture parameters for continued crack growth (as opposed to growth initiation) is included.

Author Information

Sorensen, EP
General Motors Research Laboratories, Warren, Mich.
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Details
Developed by Committee: E08
Pages: 151–174
DOI: 10.1520/STP35829S
ISBN-EB: 978-0-8031-4739-3
ISBN-13: 978-0-8031-0330-6