2 research outputs found
A novel approach for evaluating creep damage and cavitation in copper bicrystals subject to constant load
Creep in metal alloys is an important failure mode for high temperature and stress applications, but despite extensive study it is still not fully understood, particularly the early stage of creep cavity formation. This paper describes a novel constant load cantilever beam test to investigate creep damage and cavitation at grain boundaries in copper bicrystals. Bicrystals of copper have been prepared with the grain boundary oriented normal to the beam long axis, allowing the development of damage at a single boundary to be studied. Tests were conducted at a temperature of 285°C in a vacuum of 10−10 MPa. Creep cavitation is observed in copper bicrystals of {001} and {111} orientation with a 22° rotation at the boundary. We compare these data with observations for a polycrystalline copper specimen.</p
SCOPE: SCUBA-2 Continuum Observations of Pre-protostellar Evolution - survey description and compact source catalogue
We present the first release of the data and compact-source catalogue for the JCMT Large
Program SCUBA-2 Continuum Observations of Pre-protostellar Evolution (SCOPE). SCOPE
consists of 850 μm continuum observations of 1235 Planck Galactic Cold Clumps (PGCCs)
made with the Submillimetre Common-User Bolometer Array 2 on the James Clerk Maxwell
Telescope. These data are at an angular resolution of 14.4 arcsec, significantly improving upon
the 353 GHz resolution of Planck at 5 arcmin, and allowing for a catalogue of 3528 compact
sources in 558 PGCCs. We find that the detected PGCCs have significant sub-structure,
with 61 per cent of detected PGCCs having three or more compact sources, with filamentary
structure also prevalent within the sample. A detection rate of 45 per cent is found across the
survey, which is 95 per cent complete to Planck column densities of N(H2) > 5 × 10^21 cm^−2.
By positionally associating the SCOPE compact sources with young stellar objects, the star
formation efficiency, as measured by the ratio of luminosity to mass, in nearby clouds is found
to be similar to that in the more distant Galactic Plane, with the column density distributions
also indistinguishable from each other