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time-dependent crack growth

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540281
EISBN: 978-1-62708-309-6
... Abstract Large-scale yielding at the crack tip and time-dependent crack growth mechanisms, such as stress relaxation due to creep, are nonlinear behaviors requiring nonlinear analysis methods. This chapter presents two such methods, one based on elastic-plastic fracture mechanics, the other on...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240117
EISBN: 978-1-62708-251-8
... increasing time at a constant temperature is small compared to that occurring at constant time with increasing temperature. Grain-boundary migration rate depends on solute content and orientation. Second-phase particles tend to pin grain boundaries and slow down grain growth. Fig. 8.22 Diffusion of...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540215
EISBN: 978-1-62708-309-6
... Life Assessment of High-Temperature Components , ASM International , 1989 5.87. Nicholas T. and Ashbaugh N.E. , Fatigue Crack Growth at High Load Ratios in the Time-Dependent Regime , Fracture Mechanics: 19th Symposium, STP 969 , ASTM , 1988 , p 800 – 817 10.1520/STP33107S...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090341
EISBN: 978-1-62708-266-2
... produce immediate failure. It describes crack growth mechanisms, explains how to measure crack growth rates and predict time to failure, and provides crack growth data for a number of materials and environments. ceramics environmentally enhanced crack growth glass stress-corrosion cracking...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540297
EISBN: 978-1-62708-309-6
... effects, and that the cyclic crack growth rates in ceramics or glasses are simply manifestations of environmentally assisted crack growth under sustained tensile loading. That means da/dN and da/dt are interchangeable (after converting the time-based da/dt to the cycle-based da/dN , and vice versa...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030126
EISBN: 978-1-62708-282-2
.... and Duquette D.J. , The Role of Environment on Time Dependent Crack Growth , Micro and Macro Mechanics of Crack Growth , Sadananda K. , Rath B.B. , and Michel D.J. , Ed., American Institute of Mining, Metallurgical, and Petroleum Engineers, 1982 , p 29 13. Parkins...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090001
EISBN: 978-1-62708-266-2
... on Time Dependent Crack Growth , Micro and Macro Mechanics of Crack Growth , Sadananda K. , Rath B.B. , and Michel D.J. , Ed., American Institute of Mining, Metallurgical, and Petroleum Engineers , 1982 , p 29 1.16 Parkins R.M. , Mater. Sci. Technol. , Vol 1 , 1985...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090191
EISBN: 978-1-62708-266-2
... international consensus is that the three with the greatest impact on crack growth rates are the formation of material defects, radiation-induced segregation, and chemical reactions that increase the corrosion potential of water. The chapter discusses each of these in great detail, and includes information on...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610303
EISBN: 978-1-62708-303-4
... intensity at K = k t σ π a . Because fatigue crack growth depends roughly on the third power of K , small cracks at stress concentrations grow faster by approximately k t 3 . Thus, a crack emanating from a simple hole grows about nine times faster than one of...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090221
EISBN: 978-1-62708-266-2
... Abstract This chapter describes the conditions under which copper-base alloys are susceptible to stress-corrosion cracking (SCC) and some of the environmental factors, such as temperature, pH, and corrosion potential, that influence crack growth and time to failure. It explains that, although...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540169
EISBN: 978-1-62708-309-6
... , 1975 , p 631 10.1007/BF02672284 4.30. Dull D.L. and Raymond L. , Stress History Effect on Incubation Time for Stress Corrosion Crack Growth in AISI 4340 Steel , Metall. Trans. , Vol 3 , 1972 , p 2943 – 2947 10.1007/BF02652865 4.31. Zanis C.A. , Holsberg P.W...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610377
EISBN: 978-1-62708-303-4
... fatigue, those being matrix cracking, fiber breaking, crack coupling, delamination initiation, and delamination growth. The chapter describes each mechanism in detail along with related factors. It also discusses the primary differences between composites and metals, the effect of manufacturing defects...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090067
EISBN: 978-1-62708-266-2
... been found to decrease crack growth rate and increase time to failure ( Ref 3.38 ). For maraging steels, the levels of the major alloying elements are kept within guidelines ( Ref 3.3 ). Additionally, residual element content is minimized to achieve optimal mechanical properties and fracture...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610147
EISBN: 978-1-62708-303-4
... where Y depends on crack length, these integrations will generally be performed using numerical techniques. During region II crack growth, some metals are sensitive to the load ratio ( R ), as shown in Fig. 42 for 7075-T651 aluminum plate. The Paris equation does not account for the load ratio...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140069
EISBN: 978-1-62708-335-5
... wrought alloys, including clad 2024. Source: Ref 11 The growth characteristics of a number of aluminum casting alloys are represented by the curves in Data Set 2 . Growth, or more appropriately, dimensional change with time that may be contractive as well as expansive, occurs as a result of...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140069
EISBN: 978-1-62708-335-5
... wrought alloys, including clad 2024. Source: Ref 11 The growth characteristics of a number of aluminum casting alloys are represented by the curves in Data Set 2 . Growth, or more appropriately, dimensional change with time that may be contractive as well as expansive, occurs as a result of...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610327
EISBN: 978-1-62708-303-4
... converting the time-based da/dt to the cycle-based da/dn , and vice versa. Many curve-fitting equations were developed to fit the da/dt data and then convert it to da/dn data. However, conclusive evidence of true cyclic crack growth behavior in glasses and ceramics has surfaced in recent studies, as...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240243
EISBN: 978-1-62708-251-8
..., a large enough variation or fluctuation in the applied stress, and a sufficiently large number of cycles of the applied stress. The discussion covers high-cycle fatigue, low-cycle fatigue, and fatigue crack propagation. The chapter then discusses the stages where fatigue crack nucleation and growth...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240265
EISBN: 978-1-62708-251-8
... until fracture occurs. This type of fracture is very similar to ductile fracture modes experienced at room temperature, except that at elevated temperature, void formation and growth is aided by diffusion. Intergranular fracture is a creep fracture mode that occurs at lower stresses and longer times...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2000
DOI: 10.31399/asm.tb.aet.t68260119
EISBN: 978-1-62708-336-2
... homogenization, and the cause of casting defects, including cracking and splitting, segregation, porosity, and grain growth. aluminum alloys billets casting casting defects The extrusion process consists of four major components, hydraulic press, die, tooling, and billet casting. In the previous...