Characterization of Intrinsic ΔKth to Support Crack Growth Estimates under Spectrum Loading in the HCF/VHCF Domain

2020 ◽  
Vol 9 (5) ◽  
pp. 20190223
Author(s):  
R. Sunder ◽  
Ramesh Koraddi ◽  
Vishwas Chandra
Keyword(s):  
Crack Growth ◽  
Spectrum Loading

A macroscopic theory of microcrack growth in brittle materials

1991 ◽  
Vol 335 (1639) ◽  
pp. 455-485 ◽  
Keyword(s):  
Crack Growth ◽  
Brittle Materials ◽  
Macroscopic Theory ◽  
Rate Of Increase ◽  
Inelastic Behaviour ◽  
Constitutive Response ◽  
Macroscopic Plasticity ◽  
Microcrack Growth ◽  
Vector Valued

This paper is concerned with the development of a macroscopic theory of crack growth in fairly brittle materials. Average characteristics of the cracks are described in terms of an additional vector-valued variable in the macroscopic theory, which is determined by an additional momentum-like balance law associated with the rate of increase of the area of the cracks and includes the effects of forces maintaining the crack growth and the inertia of microscopic particles surrounding the cracks. The basic developments represent an idealized characterization of inelastic behaviour in the presence of crack growth, which accounts for energy dissipation without explicit use of macroscopic plasticity effects. A physically plausible constraint on the rate of crack growth is adopted to simplify the theory. To ensure that the results of the theory are physically reasonable, the constitutive response of the dependent variables are significantly restricted by consideration both of the energetic effects and of the microscopic processes that give rise to crack growth. These constitutive developments are in conformity with many of the standard results and observations reported in the literature on fracture mechanics. The predictive nature of the theory is illustrated with reference to two simple examples concerning uniform extensive and compressive straining.

Quantifying Spectrum Loading Effects on Fatigue Crack Growth in 7075-T73 Aluminum

2000 ◽  
Vol 45 (1) ◽  
pp. 11-18
Author(s):  
H. Lewis Zion ◽  
W. Steven Johnson ◽  
Dale L. Ball ◽  
Richard A. Everett
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Loading Effects ◽  
Spectrum Loading
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