Elastic modulus and damping of coatings based on microscopic defects

Abstract

In this study, the influence of microscopic defects on the elastic modulus and damping of hard coatings was examined by finite element (FE) analysis. We present a method based on image processing and FE modelling to calculate the elastic modulus and loss factor of hard coatings. The calculated results agree with the results of the dynamic mechanical analysis. Furthermore, by using this method, the effects of the loading and friction coefficient between cracks on loss factor of hard coatings are studied. From the microscopic point of view, we study the relationship between the microscopic defects and macroscopic properties of the coating, thus providing a new idea for simulating and actively designing hard coatings.

Damping performance of Mo-based coatings prepared by supersonic arc spraying

“…There were no obvious cracks in dense structure coatings. The layered structure and pores were conducive to the consumption of vibration energy and the improvement of damping performance of coatings [19-21].

Figure 3 Cross section of CM4 coatings: (a) SEM, (b) EDS.

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Application of an Image-Based Model of the Elastic Modulus of Porous Thermal Barrier Coatings

“…Four-phase Model FEA Model [24] Fig. 15 Comparison of the predicted results with FEA results of APS-YSZ coatings measured value than the FEA results, with an error percentage of approximately 0.81%.…”

“…axis, i.e., a < b or c. This leads to a value to shape factor F falling within 0 to 1/3. First, different SEM and optical micrographs (OM) of porous ceramic coatings were collected from previously published research [23][24][25]. The materials studied in this work are 8 wt% YSZ and 6-8 wt% sprayed yttria-stabilized zirconia (YSZ) with four different feedstocks: fused and crushed (F&C), hollow sphere (HOSP), sol-gel, and agglomerated and sintered (A&S).…”

“…Figure 15 compares the modeled results of APS-YSZ coatings with the FEA results [24], and Table 1 illustrates a comparison of the averaged predicted results with both FEA and experimental results. It should be noted that the bulk value of the elastic modulus of APS-YSZ coatings is 210 GPa, as given in reference [24]. All the modeled results are in good agreement with FEA results, as seen in Fig.…”

“…Fig 13. Four different images from different locations of the APS-YSZ coating (Reprinted from[24] with permission: copyright 2021 Taylor & Francis)…”