THE INVESTIGATION OF THE EFFECTS OF LOADING RATE AND STRESS CONCENTRATION FACTORS ON THE NOTCH PROPERTIES OF THREE SHEET ALLOYS AT SUBZERO TEMPERATURES
Final rept., July 1960-Feb 1962
AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OH METALS AND CERAMICS LAB
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The effect of theoretical stress concentration factors, and loading rates at 26, -78, and -196 C are presented for 301XH stainless steel, Rene 41, and Vasco Jet-1000 sheet materials. The un notched specimens, tested at room temperature, were not appreciably affected by loading rate however, some effects were observed for the specimens tested at sub-zero temperatures. The loading rate had some effect on the notched tensile specimens at all test temperatures. The temperature effect was more pronounced on the notched tensile specimen at the fastest loading rate. In most instances the tensile strength in creased as the temperature decreased. The percent elongation for the three materials was highest at the -78 C test temperature. Type H-11 material became very brittle at -196 C and shattered upon fracture. The notch to unnotch strength ratio decreased as the stress concentration factor increased.
- Properties of Metals and Alloys