Grain size dependence of fracture toughness and crack-growth resistance of superelastic NiTi

2016 ◽  
Vol 113 ◽  
pp. 171-175 ◽  
Author(s):  
Aslan Ahadi ◽  
Qingping Sun
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Crack Growth ◽  
Size Dependence ◽  
Crack Growth Resistance

The Effects of Grain Size on Strength, Fracture Toughness, and Static Fatigue Crack Growth in Alumina

1992 ◽  
pp. 125-136 ◽  
Author(s):  
Nobuyuki Miyahara ◽  
Yoshiharu Mutoh ◽  
Kouhei Yamaishi ◽  
Keizo Uematsu ◽  
Makoto Inoue
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Static Fatigue

scholarly journals Grain Size Dependence of Fracture Toughness in an Ultrahigh Strength Maraging Steel

1983 ◽  
Vol 69 (1) ◽  
pp. 145-152 ◽  
Author(s):  
Yoshikuni KAWABE ◽  
Seiichi MUNEKI ◽  
Junji TAKAHASHI
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Maraging Steel ◽  
Size Dependence ◽  
Ultrahigh Strength

Grain size effects on cyclic fatigue and crack-growth resistance behaviour of partially stabilized zirconia

1995 ◽  
Vol 30 (13) ◽  
pp. 3291-3299 ◽  
Author(s):  
M. J. Hoffman ◽  
Yiu-Wing Mai ◽  
R. H. Dauskardt ◽  
J. Ager ◽  
R. O. Ritchie
Keyword(s):  
Grain Size ◽  
Crack Growth ◽  
Size Effects ◽  
Cyclic Fatigue ◽  
Crack Growth Resistance ◽  
Stabilized Zirconia ◽  
Partially Stabilized Zirconia ◽  
Grain Size Effects

scholarly journals Mechanical and Fatigue Properties of Diamond Reinforced Cu and Al Metal Matrix Composites Prepared by Cold Spray

2021 ◽  
Author(s):  
O. Kovarik ◽  
J. Cizek ◽  
S. Yin ◽  
R. Lupoi ◽  
M. Janovska ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Cold Spray ◽  
Pure Metal ◽  
Crack Growth Resistance ◽  
Fatigue Properties ◽  
Matrix Composites ◽  
Fatigue Crack Growth Resistance

Abstract Diamond-reinforced composites prepared by cold spray are emerging materials simultaneously featuring outstanding thermal conductivity and wear resistance. Their mechanical and fatigue properties relevant to perspective engineering applications were investigated using miniature bending specimens. Cold sprayed specimens with two different mass concentrations of diamond 20% and 50% in two metallic matrices (Al – lighter than diamond; Cu – heavier than diamond) were compared with the respective pure metal deposits. These pure metal coatings showed rather limited ductility. The diamond addition slightly improved ductility and fracture toughness of the Cu-based composites; having a small effect also on the fatigue crack growth resistance. In case of the Al composites; the ductility as well as fatigue crack growth resistance and fracture toughness have improved significantly. The static and fatigue failure mechanisms were fractographically analyzed and related to the microstructure of the coatings; observing that particle decohesion is the primary failure mechanism for both static and fatigue fracture.

CMC Mode II Crack Growth Resistance Prediction of ASTM Specimen and Test Validation

2019 ◽  
Author(s):  
Frank Abdi ◽  
Cody Godines ◽  
Michael J. Presby ◽  
Amir Eftekharian ◽  
Jalees Ahmad ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Crack Growth ◽  
Standardized Test ◽  
Crack Tip ◽  
Test Methods ◽  
Crack Growth Resistance ◽  
Mode Ii ◽  
Mode Ii Fracture ◽  
Mode Ii Fracture Toughness ◽  
Mode Ii Crack

Abstract The objective of this effort is to predict ceramic matrix composites (CMC) interlaminar Mode II Crack Growth Resistance (CGR), and the design of ASTM test specimen. Currently, there are a number of test standards and American Society for Testing and Materials (ASTM) for CMC’s at both ambient and elevated temperatures; however, there are no standardized test methods for determination of interlaminar shear (Mode II) fracture toughness in CMC’s. Although research work exists on interlaminar Mode II fracture toughness of CMC’s, the test methods applied showed definite drawbacks and limitations. Delamination Crack Growth (CGR) tests of CMC Mode II may exhibit zig-zag pattern, wavy cracks, fiber bridging, and premature specimen failure under bending load. The experimental parameters that may contribute to the difficulty can be summarized as specimen width and thickness, interface coating thickness, mixed mode failure evolution, and interlaminar defects. Modes II crack growth resistances, GII, were analytically and numerically determined at ambient temperature using end notched flexure (ENF) and the end-loaded split (ELS). Finite Element (FE) based. Multi-scale progressive failure analysis (MS-PFA) a combined Micro-mechanical damage and fracture mechanics Virtual Crack Closure Technique (VCCT) algorithms. Modeling of melt-infiltrated SiC/SiC CMC of ENF specimen (Laminate: with initial crack length was accomplished using a MS-PFA and VCCT approach. Test data were compared with MS-PFA prediction: a) Force vs. Crack Opening Displacement; and b) Mode II crack tip energy release rate vs. crack extension length for both edge and center line due to formation of Micro Crack Density Contribution, Crack Tip Stiffness Reduction; and c) zig-zag crack growth behavior (adhesive/cohesive). Next the ASTM Standard Proposed linear SGR equation was developed based on interpretation compliance technique from both MS-PFA Analysis and Test.

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