Author: GA. Clarke
Publisher:
ISBN:
Category : Crack propagation
Languages : en
Pages : 19
Book Description
Air environment fatigue crack growth rate data were developed for a 1950 vintage (air cast) chromium-molybdenum-vanadium (CrMoV) rotor steel at temperatures of 24, 121, 260, and 427°C (75, 250, 500, and 850°F) and loading frequencies of 0.0017, 0.017, 0.1, and 1.0 Hz. Results show that the room-temperature fatigue crack growth rate in the 1950 vintage material is on the order of two to eight times faster than that encountered in a more modern vacuum cast forging depending upon the ?K level of interest. Results also show that the effect of frequency on the fatigue crack growth rate varies with differing test temperatures. At room temperature as well as at 260 and 427°C (500 and 800°F), the rate of crack growth increases with decreasing frequency. At 121° (250°F), there is little effect of loading frequency on fatigue crack growth rate. This temperature dependent frequency effect is attributed to the different mechanisms interacted with fatigue at various temperatures. The effect of temperature on crack growth rates was also found to be frequency dependent with more pronounced temperature effects observed at lower frequencies. However, the general trend is the same for all values of frequency, that the rate of fatigue crack growth initially decreases before increasing at higher temperatures. The fact that fatigue crack growth rates do not increase monotonically with increasing temperature is attributed to the decrease in relative humidity of the test environment with increasing temperature.
Effects of Temperature and Frequency on the Fatigue Crack Growth Rate Properties of a 1950 Vintage CrMoV Rotor Material
Author: GA. Clarke
Publisher:
ISBN:
Category : Crack propagation
Languages : en
Pages : 19
Book Description
Air environment fatigue crack growth rate data were developed for a 1950 vintage (air cast) chromium-molybdenum-vanadium (CrMoV) rotor steel at temperatures of 24, 121, 260, and 427°C (75, 250, 500, and 850°F) and loading frequencies of 0.0017, 0.017, 0.1, and 1.0 Hz. Results show that the room-temperature fatigue crack growth rate in the 1950 vintage material is on the order of two to eight times faster than that encountered in a more modern vacuum cast forging depending upon the ?K level of interest. Results also show that the effect of frequency on the fatigue crack growth rate varies with differing test temperatures. At room temperature as well as at 260 and 427°C (500 and 800°F), the rate of crack growth increases with decreasing frequency. At 121° (250°F), there is little effect of loading frequency on fatigue crack growth rate. This temperature dependent frequency effect is attributed to the different mechanisms interacted with fatigue at various temperatures. The effect of temperature on crack growth rates was also found to be frequency dependent with more pronounced temperature effects observed at lower frequencies. However, the general trend is the same for all values of frequency, that the rate of fatigue crack growth initially decreases before increasing at higher temperatures. The fact that fatigue crack growth rates do not increase monotonically with increasing temperature is attributed to the decrease in relative humidity of the test environment with increasing temperature.
Publisher:
ISBN:
Category : Crack propagation
Languages : en
Pages : 19
Book Description
Air environment fatigue crack growth rate data were developed for a 1950 vintage (air cast) chromium-molybdenum-vanadium (CrMoV) rotor steel at temperatures of 24, 121, 260, and 427°C (75, 250, 500, and 850°F) and loading frequencies of 0.0017, 0.017, 0.1, and 1.0 Hz. Results show that the room-temperature fatigue crack growth rate in the 1950 vintage material is on the order of two to eight times faster than that encountered in a more modern vacuum cast forging depending upon the ?K level of interest. Results also show that the effect of frequency on the fatigue crack growth rate varies with differing test temperatures. At room temperature as well as at 260 and 427°C (500 and 800°F), the rate of crack growth increases with decreasing frequency. At 121° (250°F), there is little effect of loading frequency on fatigue crack growth rate. This temperature dependent frequency effect is attributed to the different mechanisms interacted with fatigue at various temperatures. The effect of temperature on crack growth rates was also found to be frequency dependent with more pronounced temperature effects observed at lower frequencies. However, the general trend is the same for all values of frequency, that the rate of fatigue crack growth initially decreases before increasing at higher temperatures. The fact that fatigue crack growth rates do not increase monotonically with increasing temperature is attributed to the decrease in relative humidity of the test environment with increasing temperature.
Fracture Mechanics
Author: Thomas A. Cruse
Publisher: ASTM International
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 796
Book Description
Publisher: ASTM International
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 796
Book Description
Fracture Mechanics
Author: National Symposium on Fracture Mechanics
Publisher: ASTM International
ISBN: 9780803103641
Category : Technology & Engineering
Languages : en
Pages : 808
Book Description
Publisher: ASTM International
ISBN: 9780803103641
Category : Technology & Engineering
Languages : en
Pages : 808
Book Description
ASTM Special Technical Publication
Author:
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 814
Book Description
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 814
Book Description
Structural Life Assessment Methods
Author: A. F. Liu
Publisher: ASM International
ISBN: 9781615032037
Category : Technology & Engineering
Languages : en
Pages : 436
Book Description
Publisher: ASM International
ISBN: 9781615032037
Category : Technology & Engineering
Languages : en
Pages : 436
Book Description
Proceedings of the ... National Symposium on Fracture Mechanics
Author:
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 818
Book Description
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 818
Book Description
Mechanics and Mechanisms of Fracture
Author: Alan F. Liu
Publisher: ASM International
ISBN: 1615032525
Category : Technology & Engineering
Languages : en
Pages : 452
Book Description
Publisher: ASM International
ISBN: 1615032525
Category : Technology & Engineering
Languages : en
Pages : 452
Book Description
Metals Abstracts
Author:
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 744
Book Description
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 744
Book Description
Proceedings of the Eleventh National Symposium on Fracture Mechanics
Author:
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 820
Book Description
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 820
Book Description
Quality and Reliability Management and Its Applications
Author: Hoang Pham
Publisher: Springer
ISBN: 1447167783
Category : Technology & Engineering
Languages : en
Pages : 453
Book Description
Integrating development processes, policies, and reliability predictions from the beginning of the product development lifecycle to ensure high levels of product performance and safety, this book helps companies overcome the challenges posed by increasingly complex systems in today’s competitive marketplace. Examining both research on and practical aspects of product quality and reliability management with an emphasis on applications, the book features contributions written by active researchers and/or experienced practitioners in the field, so as to effectively bridge the gap between theory and practice and address new research challenges in reliability and quality management in practice. Postgraduates, researchers and practitioners in the areas of reliability engineering and management, amongst others, will find the book to offer a state-of-the-art survey of quality and reliability management and practices.
Publisher: Springer
ISBN: 1447167783
Category : Technology & Engineering
Languages : en
Pages : 453
Book Description
Integrating development processes, policies, and reliability predictions from the beginning of the product development lifecycle to ensure high levels of product performance and safety, this book helps companies overcome the challenges posed by increasingly complex systems in today’s competitive marketplace. Examining both research on and practical aspects of product quality and reliability management with an emphasis on applications, the book features contributions written by active researchers and/or experienced practitioners in the field, so as to effectively bridge the gap between theory and practice and address new research challenges in reliability and quality management in practice. Postgraduates, researchers and practitioners in the areas of reliability engineering and management, amongst others, will find the book to offer a state-of-the-art survey of quality and reliability management and practices.