Elastic modulus and thermal stress in coating during heat cycling with different substrate shapes

doi:10.1007/s11465-015-0351-0

Front. Mech. Eng.

2015, Vol. 10

Issue (3) : 294-300 https://doi.org/10.1007/s11465-015-0351-0

RESEARCH ARTICLE

Elastic modulus and thermal stress in coating during heat cycling with different substrate shapes

Daniel GAONA¹(

), Alfredo VALAREZO²

¹. Mechanical Engineering, Universidad San Francisco de Quito, Quito, Ecuador
². Material Science and Engineering, Universidad San Francisco de Quito, Quito, Ecuador

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Abstract

The elastic modulus of a deposit (E_d) can be obtained by monitoring the temperature (∆T) and curvature (∆k) of a one-side coated long plate, namely, a one-dimensional (1D) deformation model. The aim of this research is to design an experimental setup that proves whether a 1D deformation model can be scaled for complex geometries. The setup includes a laser displacement sensor mounted on a robotic arm capable of scanning a specimen surface and measuring its deformation. The reproducibility of the results is verified by comparing the present results with Stony Brook University Laboratory’s results. The ∆k-∆T slope error is less than 8%, and the E_d estimation error is close to 2%. These values reveal the repeatability of the experiments. Several samples fabricated with aluminum as the substrate and 100MXC nanowire (Fe and Cr alloy) as the deposit are analyzed and compared with those in finite element (FE) simulations. The linear elastic behavior of 1D (flat long plate) and 2D (squared plate) specimens during heating/cooling cycles is demonstrated by the high linearity of all ∆k-∆T curves (over 97%). The E_d values are approximately equal for 1D and 2D analyses, with a median of 96 GPa and standard deviation of 2 GPa. The correspondence between the experimental and simulated results for the 1D and 2D specimens reveals that deformation and thermal stress in coated specimens can be predicted regardless of specimen geometry through FE modeling and by using the experimental value of E_d. An example of a turbine-blade-shaped substrate is presented to validate the approach.

Keywords in-plane Young’s modulus curvature temperature thermal stress coating

Corresponding Author(s): Daniel GAONA

Online First Date: 08 September 2015 Issue Date: 28 September 2015

Cite this article:

Daniel GAONA,Alfredo VALAREZO. Elastic modulus and thermal stress in coating during heat cycling with different substrate shapes[J]. Front. Mech. Eng., 2015, 10(3): 294-300.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-015-0351-0
https://academic.hep.com.cn/fme/EN/Y2015/V10/I3/294

Fig.1 Operation of the experimental setup

Fig.2 Actual implementation of the experimental setup in the Robotics Laboratory of Universidad San Francisco de Quito, Ecuador

Tab.1 Mechanical properties and dimensions of the SS316 specimen coated with tungsten cobalt [9]

Fig.3 Curvature vs. temperature experimental data for three heating/cooling cycles for the SS316 specimen coated with tungsten cobalt alloy

Fig.4 Curvature vs. temperature experimental data for the SS316 specimen coated with tungsten cobalt alloy acquired at Stony Brook University and Universidad San Francisco de Quito Laboratories (USFQ)

Tab.2 Mechanical properties and dimensions of specimens of aluminum coated with 100MXC nanowire

Fig.5 Curvature vs. temperature experimental data of the 1D SS316 specimen coated with tungsten cobalt (Specimens I and II)

Fig.6 ABAQUS simulation of the deformation of the 1D specimen subjected to one heating cycle

Fig.7 Stress distribution through-the-thickness in the 1D specimen

Fig.8 Scanning paths over the 2D specimens

Fig.9 Curvature vs. temperature experimental data of the 2D SS316 specimen coated with tungsten cobalt (Specimens I and II)

Fig.10 ABAQUS simulation of the deformation of the 2D specimen subjected to a heating cycle

Fig.11 Stress distribution in the 2D specimen through-the-thickness

Fig.12 Experimental deformation of the 3D specimen (turbocharger blade) at different temperatures

Fig.13 ABAQUS simulation of the deformation of the 3D specimen

Fig.14 ABAQUS simulation of the deformation of the 3D specimen

Fig.15 ABAQUS representation of the principal stress distribution (MPa)

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