Variable-Amplitude Fatigue Crack Initiation and Growth of Five Carbon Or Low-Alloy Cast Steels at Room and Low Climatic Temperatures PDF Download
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Author: A. Fatemi Publisher: ISBN: Category : Crack growth Languages : en Pages : 20
Book Description
Five common cast steels were subjected to SAE transmission history at room temperature and three low climatic temperatures using an as-drilled keyhole notched compact specimen. The three low temperatures were -34, -45, and -60°C. These temperatures were both above and below nil ductility transition temperatures. Three fatigue criteria were specifically monitored: crack initiation defined by the first visible surface crack ?a equal to 0.25 mm, ?a equal to 2.5 mm, and final fracture. All low-temperature total fatigue lives were equal to or better than at room temperature for four of the five cast steels. All steels exhibited crack initiation lives at low temperatures equal to or better than at room temperature. Fatigue crack growth life tended to increase as the temperature was lowered, and then this trend reversed. Scanning electron fractographic analysis showed all ductile type fatigue crack growth mechanisms above or below the nil ductility transition temperature.
Author: A. Fatemi Publisher: ISBN: Category : Crack growth Languages : en Pages : 20
Book Description
Five common cast steels were subjected to SAE transmission history at room temperature and three low climatic temperatures using an as-drilled keyhole notched compact specimen. The three low temperatures were -34, -45, and -60°C. These temperatures were both above and below nil ductility transition temperatures. Three fatigue criteria were specifically monitored: crack initiation defined by the first visible surface crack ?a equal to 0.25 mm, ?a equal to 2.5 mm, and final fracture. All low-temperature total fatigue lives were equal to or better than at room temperature for four of the five cast steels. All steels exhibited crack initiation lives at low temperatures equal to or better than at room temperature. Fatigue crack growth life tended to increase as the temperature was lowered, and then this trend reversed. Scanning electron fractographic analysis showed all ductile type fatigue crack growth mechanisms above or below the nil ductility transition temperature.
Author: JH. Chung Publisher: ISBN: Category : Crack growth Languages : en Pages : 21
Book Description
Five common carbon or low-alloy cast steels--SAE 0030, SAE 0050A, C-Mn, Mn-Mo and AISI 8630--were subjected to constant-amplitude fatigue tests at room temperature and at the common low climatic temperature of -45°C (-50°F). Tests included smooth specimen axial low and high cycle fatigue and compact type (CT) specimen crack growth behavior from 10-5 n/cycle (4 x 10-4 in./cycle) to threshold values at 10-10 m/cycle (4 x 10-9 in./cycle). Three of the five steels had nil ductility transition temperatures above the low test temperature. Despite this, all five cast steels showed equivalent or better fatigue resistance at the low temperature, except for some very short life low-cycle fatigue tests and for some very high fatigue crack growth rates where fracture was imminent. Scanning electron fractographic analysis indicated that ductile type fatigue crack growth mechanisms with or without striations occurred for all steels at both test temperatures except for a few interdispersed cleavage facets in 0050A steel at very high crack growth rates. At the low temperature, monotonic and cyclic stress-strain properties Su, Sy, and Sy' increased by an average of about 10%, fatigue limits increased from 2 to 25%, and ?Kth increased from 0 to 90%. No consistent correlations existed between fatigue and monotonic properties at either temperature. Mean stress effects at near ?Kth levels appeared to be influenced by crack closure.
Author: ASM International. Handbook Committee Publisher: ISBN: Category : Fracture mechanics Languages : en Pages : 1080
Book Description
These volumes cover the properties, processing, and applications of metals and nonmetallic engineering materials. They are designed to provide the authoritative information and data necessary for the appropriate selection of materials to meet critical design and performance criteria.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Section III of the ASME Boiler and Pressure Vessel Code specifies fatigue design curves for structural materials. These curves were based on tests of smooth polished specimens at room temperature in air. The effects of reactor coolant environments are not explicitly addressed by the Code design curves, but recent test data illustrate potentially significant effects of LWR coolant environments on the fatigue resistance of carbon and low-alloy steels. Under certain loading and environmental conditions, fatigue lives of test specimens may be a factor of[approx]70 shorter than in air. Results of fatigue tests that examine the influence of reactor environment on crack imitation and crack growth of carbon and low-alloy steels are presented. Crack lengths as a function of fatigue cycles were determined in air by a surface replication technique, and in water by block loading that leaves marks on the fracture surface. Decreases in fatigue life of low-alloy steels in high-dissolved-oxygen (DO) water are primarily caused by the effects of environment during early stages of fatigue damage, i.e., growth of short cracks100[micro]m in depth. For crack sizes of100[micro]m, crack growth rates in high-DO water are higher than in air by one order of magnitude. The effects of LWR environments on growth of short cracks are discussed.
Author: A. Fatemi
Author: A. Fatemi
Author: Ralph Ivan Stephens
Author: JH. Chung
Author: 
Author: 
Author: Ralph I. Stephens
Author: ASM International. Handbook Committee
Author: Arctic Science and Technology Information System
Author: 
Author: American Society for Testing and Materials