Stress distribution and fracture behavior of beryllium compact tension specimens

Journal Article · Fri Feb 15 04:00:00 EST 2008 · Materials Characterization

OSTI ID:21062195

Ping, Dong; Xiaolin, Wang ^[1]

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1. China Academy of Engineering Physics, P.O. Box 919-71, Mianyang, Sichuan, 621900 (China)

Compact tension specimens of beryllium (Be) were designed to study fracture behavior and mechanical properties. The local stress distribution near a notch in a compact tension specimen was measured in situ by the combination of an X-ray stress analysis and a custom-designed load device. The fracture morphology was observed by scanning electron microscopy. The result showed that the local stresses near the notch tip are much higher than in other areas, and cracking occurs first in that area. The load-crack opening displacement curve of the Be compact tension specimen was obtained, and used to calculate the fracture toughness as 15.7 MPa{radical}m. The compact tension specimen fracture surfaces were mainly characterized by cleavage fracture over three different areas. Cleavage micro-cracks along the basal slip plane were formed at the crack tip, and their growth was controlled by the primary stress after reaching a critical length.

• OSTI ID: 21062195
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 2 Vol. 59; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BERYLLIUM
COMPACTS
CRACKS
FRACTURE PROPERTIES
FRACTURES
MORPHOLOGY
SCANNING ELECTRON MICROSCOPY
STRESS ANALYSIS
STRESSES
SURFACES