Cleavage cracking of ductile-metal substrates induced by brittle coating fracture

Effects of interface shear strength during failure of semicoherent Metal-Metal nanolaminates: An example of accumulative roll-bonded Cu /Nb

Crystallization of SiC and its effects on microstructure, hardness and toughness in TaC/SiC multilayer films

To determine the interfacial properties of thermal barrier coatings (TBCs) is imperative for their durability evaluation and further improvements. In this work, a ceramic coating (topcoat) and a NiCoCrALY bondcoat were atmospheric-plasma-sprayed (APS) on a superalloy substrate. A three-point bending test was adopted to initiate and propagate the topcoat/bondcoat (TC/BC) interfacial cracking. The load-displacement curves indicate three stages in crack initiation and stable crack growth. After a complete delamination, the fracture surfaces were examined by an optical microscope and a scanning electron microscope, which shows that the cracking plane was merely on the TC/BC interface. The displacement and strain fields of the TC/BC cross-section were acquired using digital image correlation (DIC) method, and the crack length was obtained with an inverse finite element method based on the crack opening displacement measured by the DIC method. Finally, the critical strain energy release rate Gc for crack propagation can be reliably determined from a theoretical analysis using compliance methods. The results indicate that experimental data are consistent with the beam theory analysis.

Investigation on interfacial fracture toughness of plasma-sprayed TBCs using a three-point bending method

A review of theoretical analysis techniques for cracking and corrosive degradation of film-substrate systems

Abstract Cu/Cr nanostructured multilayer films (NMFs) with modulation periods ( λ ) ranging from 250 nm to 10 nm and modulation ratios ( η ) ranging from 0.1 to 2.0 were prepared on flexible polyimide substrates by using magnetron sputtering. Upon uniaxial tensile testing, the critical cracking strain ( e c ), critical buckling strain ( e b ), and fracture toughness ( K IC ) of the NMFs were experimentally measured and all of the mechanical properties showed remarkable λ - and η -dependences. The cracking and buckling behaviors of the Cu/Cr NMFs were systematically investigated and both were found to depend strongly on the length scale. Based on an energy balance model, the interfacial adhesion energies ( Γ ) were determined using the measured buckle dimensions. Cracking maps and buckling maps were constructed from the experimental data to summarize the effects of λ and η on the cracking and buckling modes, respectively. In the cracking map, two regimes can be identified: one is brittle fracture with straight cracks and the other is ductile fracture with zigzag cracks. The ductile fracture regime is located in the region where λ  ∼ 40 ± 20 nm and simultaneously η K IC  ∼ 12.5 MPa m1/2. In the buckling map, four regimes are distinguished: cracked rectangular buckles, uncracked rectangular buckles, cracked triangular buckles, and uncracked triangular buckles. The effects of the length-scale-dependent deformation and adhesion energies on the buckling behaviors were discussed. A combined dimensionless parameter of K IC / E f Γ ( E f : elastic modulus of the NMF) was proposed to assess the buckling behaviors, and the K IC / E f Γ contours coincided well with the boundaries dividing the four buckling regimes.

Length-scale-dependent cracking andbuckling behaviors of nanostructured Cu/Crmultilayer films on compliant substrates

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Length-scale-dependent cracking andbuckling behaviors of nanostructured Cu/Crmultilayer films on compliant substrates