In an effort to develop simple model geometries which could be used to characterize fracture at higher mode mixities, the plain strain fiber pullout specimen has been analyzed. The specimen has been calibrated for the independent application of mechanical axial loads, and processing thermal loads. Coupled solutions were obtained via the principle of linear superposition. Trends in the energy release rate and associated near-tip phase angle have been obtained both analytically and numerically via the method of finite elements. The specimen has been found to be dominated by slightly higher mode II than mode I conditions with phase angles in the range of 50 degree(s) - 60 degree(s). Further phase angle increases were obtained by introducing symmetric stiffening layers. The solutions indicate that the plain strain pullout specimen offers an attractive experimental alternative for mixed mode fracture toughness calculations. Mode II interfacial fracture data can be obtained using the same specimen with either unabridged or bridge stiffening layers.

Date Published: 27 September 1993
PDF: 12 pages
Proc. SPIE 1999, Adhesives Engineering, (27 September 1993); doi: 10.1117/12.158601

Published in SPIE Proceedings Vol. 1999:
Adhesives Engineering
Eric A. Norland; Kenneth M. Liechti, Editor(s)