Accession Number:

ADA210121

Title:

A Hybrid Collocation Technique for Solution of the Finite Body Single Ended Crack Problem

Descriptive Note:

Research and development rept.

Corporate Author:

DAVID TAYLOR RESEARCH CENTER BETHESDA MD SHIP MATERIALS ENGINEERING DEPT

Personal Author(s):

• Kirk, Mark T.

Report Date:

1989-01-01

Pagination or Media Count:

112.0

Abstract:

A hybrid experimentalnumerical collocation technique was developed for analysis of two dimensional, finite body, single-ended crack problems. Both boundary stress conditions, known a priori, and interior and stress conditions, determined from photoelastic model, were used to specify the loading imposed on the specimen. It was determined that including the interior stress conditions in the analysis increases the rate of solution convergence. Additionally, the interior stress conditions allowed both the stress intensity factor KI and the crack mouth opening displacement to be determined over a wider range of crack lengths than was possible with boundary collocation alone. Using the hybrid collocation technique, a single edge notched tension SET, specimen, modified by introduction of a semi-circular cutout in front of the crack, was developed and characterized. Crack arrest, Stress intensity factor, Collocation, Photoelasticity.

Descriptors:

• *CRACK PROPAGATION
• STRESS CONCENTRATION
• MODELS
• TWO DIMENSIONAL
• ARRESTING(PROCESS)
• CRACKS
• DISPLACEMENT
• RATES
• BOUNDARIES
• SOLUTIONS(GENERAL)
• INTERNAL
• LENGTH
• CONVERGENCE
• PHOTOELASTICITY
• MOUTH
• STRESSES
• OPENING(PROCESS)

Subject Categories:

• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE