Effects of specimen size reduction on the transition curve of the Charpy V-notch impact test

This study was undertaken to correlate the impact properties of ASTM standard full size Charpy V-notch impact specimens to the impact properties of subsize specimens. An ASTM A533-B quenched and tempered plate steel was examined. The fine grained martensitic material had a coarse prior austenite grain size, which resulted in a low upper shelf energy for this material. Three sizes of specimens were included. Specimens were irradiated in the TRIGA Reactor Facility operated by the U. S. Geological Survey in Denver, Colorado, to 1 x 1019 n/cm2 (E \u3e 1 MeV) at 150°C (302°F). Unirradiated and irradiated specimens were tested at several temperatures in an instrumented drop tower, and the load during impact was recorded as a function of time. Full transition curves of energy versus temperature were determined for the three sizes. The results are presented and compared. A method for correlating the upper shelf energies determined from subsize and full size specimens was developed. The method incorporated a normalizing factor proposed in earlier related studies, and the method is discussed in light of the new data. The estimates of upper shelf energy derived from the correlation agreed with the measured full size values within 10%. The correlation was found to be applicable to the subsize specimen data. The irradiation induced shift in the ductile to brittle transition temperature of the material was found to be independent of specimen size --Abstract, page iii

Anthracite situation

Thesis (Ed.M.)--Boston University, 1929. This item was digitized by the Internet Archive

Town of Troy, New Hampshire 2015 town report of the officials, staff and committees of the town for the calendar year ending December 31, 2015.

This is an annual report containing vital statistics for a town/city in the state of New Hampshire

Underwater dwellings and sea born structures as paradigms of design

Thesis (M. Arch.)--Massachusetts Institute of Technology, Dept. of Architecture, 1982.MICROFICHE COPY AVAILABLE IN ARCHIVES AND ROTCH.Includes bibliographical references.There are many reasons for undertaking a work such as this. Among them are the benefits offered to society when we acknowledge the potential of submersible structures, The provision of habitable underwater space remains an unexploited resource of great potential. Hopefully, it will be utilized in an ethically intelligent manner. Perhaps, the spiritual qualities of water will foster peace engendering or life sustaining pursuits resulting in paradigms of new urban forms and ideals. Herein, a broad view is offered of inspirations and ideologies leading towards a conceptual basis for sea dwellings. Developed from an ontogenesis into criteria for environmental design, siting, energy options and program ethics, a platform for establishing a sea utilization framework is imparted. The structural design development incorporates fundamental considerations for aqueous habitats. Reinforced concrete for sea use is discussed in depth including expositions on hydraulic cements and construction techniques . A basic sea structure design/analysis method which uses thin shell theory to reliably approximate the behavior of thick shells is presented through both simple and complex examples. The volume concludes with a metamorphosis of sea dwelling concepts in the form of original sketches, technical drawings and tone paintings. This thesis attempts to broaden the scope of knowledge of the architectural designer and planner through an effort to bridge ocean sciences, ocean engineering and architectural concerns. With the knowledge thus gained, it may be possible to project further into civilization's potential for cultural development within the limited context of the sea as a dwelling place.by Ricardo Guillermo.M.Arch

Standard Specifications for Road and Bridge Construction, January 1, 2015

https://digitalcommons.memphis.edu/govpubs-tn-dept-transportation-standard-specifications/1006/thumbnail.jp

1967-11-16 Morehead News

Morehead News published on November 16, 1967