IRRADIATION CREEP IN GRAPHITE AT 40 deg C

Technical Report · Sat Aug 01 04:00:00 EDT 1964

OSTI ID:4611832

Hesketh, R V; Barnett, J T

Five tensile and five compressive restrained growth assemblies, with initial stresses - 0.1 kg.mm{sup -2} have been irradiated at 40 deg C to a neutron of 10 {sup 20} cm{sup -2} (nickel flux). Two tensile specimens fractured during irradiation. In specimens which were recovered intact the elastic strain has been measured. Differential growth strains, final Young's Modulii and fracture stresses have also been measured. On the assumption that the transient creep strain is proportional to stress and independent of temperature, the continuous creep strain is calculated. Its rate per unit of stress is three to six times that at 250 deg C, and its rate is an order of magnitude greater than the maximum predicted by the theory of dislocation unpinning. Tensile stresses four to five times the ultimate predicted by this theory are observed at strains exceeding the predicted maximum. The elastic strain to fracture is not appreciably affected by irradiation, but the total tensile strain to fracture is increased by a factor of five or six.

• Research Organization: Central Electricity Generating Board, Berkeley (England). Berkeley Nuclear Labs.
• NSA Number: NSA-19-042909
• OSTI ID: 4611832
• Report Number(s): RD/B/N-327
• Country of Publication: United Kingdom
• Language: English

Related Subjects

CREEP
FAILURES
GRAPHITE
METALS, CERAMICS, AND OTHER MATERIALS
NEUTRON BEAMS
RADIATION DOSES
RADIATION EFFECTS
Radiation Effects
STRESSES
TEMPERATURE