SYMPOSIA PAPER Published: 01 January 1984
STP32720S

Three-Dimensional Finite-Element Analysis of Chevron-Notched Fracture Specimens

Source

In this paper, stress-intensity factors and load-line displacements have been calculated for chevron-notched bar and rod-fracture specimens using a three-dimensional finite-element analysis. Both specimens were subject to simulated wedge loading (either uniform applied displacement or uniform applied load). The chevron-notch sides and crack front were assumed to be straight. Crack-length-to-specimen width ratios (a/w) ranged from 0.4 to 0.7. The width-to-thickness ratio (w/B) was 1.45 or 2. The bar specimen had a height-to-width ratio of 0.435 or 0.5. Finite-element models were composed of singularity elements around the crack front and 8-noded isoparametric elements elsewhere. The models had about 11 000 degrees of freedom. Stress-intensity factors were calculated by using a nodal-force method for distribution along the crack front and by using a compliance method for average values. The stress-intensity factors and load-line displacements are presented and compared with experimental solutions from the literature. The stress-intensity factors and load-line displacements were about 2.5 and 5% lower than the reported experimental values, respectively.

Author Information

Raju, IS
Vigyan Research Associates, Hampton, Va.
Newman, JC
NASA Langley Research Center, Hampton, Va.
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: E08
Pages: 32–48
DOI: 10.1520/STP32720S
ISBN-EB: 978-0-8031-4917-5
ISBN-13: 978-0-8031-0401-3