The mechanical properties of reinforcing steel bars at low temperature.

Title: The mechanical properties of reinforcing steel bars at low temperature.
Authors: Pang, Yun-Miew.
Date: 1972
Abstract: The mechanical properties of four reinforcing steel bars were evaluated in the temperature range from -40°C (-40°F) to 40°C (104°F). The steel bars were: #9G60 (sigmays = 60 ksi), #9G40 (sigma ys = 40 ksi), #6G60 (sigmays = 60 ksi), and #6G40 (sigma ys = 40 ksi). Both tension and Charpy V-notch Impact tests were performed in the present study. The tensile tests were carried out using a portable loading frame. A hydraulic cylinder was used to provide the force necessary to pull the specimen to rupture and the load on the specimen was measured by means of three calibrated load cells. The strains were measured with a 2" gage length extensometer, and the fracture strain was measured with calipers. The results of the tension tests showed that the yield and fracture stresses increase with decreasing temperature. The magnitude of the fracture strain does not change markedly with temperature. No consistent pattern can be discerned for the variations of yield strain with temperature. The Charpy impact tests were conducted by an Avery Charpy Impact Testing machine with a striking velocity of 16.5 ft per sec and an initial energy 220 ft lb loaded as a simple beam configuration. The Charpy impact test showed that the steel bar lost impact resistance when the testing temperature was decreased. In this report, the results of the tests were summarized to show the relationships between (1) yield stress vs temperature behavior curves, (2) fracture stress vs temperature curves, (3) yield strain vs temperature, (4) fracture strain vs temperature, (5) stress-strain curves at each temperature, and (6) the Charpy Impact energy vs various temperature curves.
CollectionTh├Ęses, 1910 - 2010 // Theses, 1910 - 2010
EC52168.PDF3.1 MBAdobe PDFOpen