Abstract
The fabrication of specific surface features requires an adequate level of repeatability to be applied in industrial production environments. Although reference is frequently made to repeatability as a strength of many micro-machining techniques, few works in the literature have been dedicated to systematic and quantitative study of this parameter. The purpose of this work was therefore to quantitatively analyze the repeatability of textured surfaces with an original approach. Aluminum alloy substrates were textured with nanosecond laser pulses to produce micro-dimple arrays. Such features are widely employed to enhance wettability and tribological behavior, for which analysis was performed in terms of interfacial area and void volume. To give the work a more general character, two other parameters based on the definition of the Pearson’s Correlation Coefficient were also tested and compared to find the most suitable parameter for assessing repeatability for a given application. Finally, a study of the point-to-point repeatability of single surface features was conducted to detect variations in process repeatability in different portions of the same processed area. For the specific laser texturing process considered, it was found that an increase in total energy dose led to improved process repeatability.
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Abbreviations
- Symbol :
-
Definition
- T:
-
Set of three-dimensional coordinates representing topographic information
- Tn:
-
Set of three-dimensional coordinates representing topographic information associated with dimple n
- \( h^n ,\bar{h},\Delta \bar{h} \) :
-
Height of dimple n, arithmetic average height, standard deviation of height
- \( A_p^n ,\bar{A},\Delta \bar{A} \) :
-
Projected area of dimple n, arithmetic average of projected area, standard deviation of projected area
- An:
-
Surface area of dimple n
- \( V^n ,\bar{V},\Delta \bar{V} \) :
-
Volume of dimple n, arithmetic average volume, standard deviation of volume
- PCC:
-
Pearson’s Correlation Coefficient
- RPT:
-
Ring Projection Transform
- \( {\text{r}}_{{\text{nk}}}^{\text{T}} \) :
-
PCC between sets Tn and Tk
- \( {\text{r}}_{{\text{nk}}}^{\text{C}} \) :
-
PCC between the RPTs associated with sets Tn and Tk
- \( \langle {{\varvec{r}}}^{{\varvec{T}}}\rangle \) :
-
Arithmetic mean of \( {\text{r}}_{{\text{C}}}^{\text{nk}} \) over all 2-element combinations of dimples without repetition
- \( \langle {{\varvec{r}}}^{{\varvec{C}}}\rangle \) :
-
Arithmetic mean of \( {\text{r}}_{{\text{nk}}}^{\text{C}} \) over all 2-element combinations of dimples without repetition
- E:
-
Energy dose per dimple
- HAZ:
-
Heat Affected Zone
- PPAM:
-
Point-to-Point Arithmetic Average
- PPSTD:
-
Point-to-Point Standard Deviation
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Lazzini, G., Lutey, A.H.A., Romoli, L. (2022). Systematic Repeatability Analysis of Nanosecond Pulsed Laser Texturing. In: Carrino, L., Tolio, T. (eds) Selected Topics in Manufacturing. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-82627-7_2
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DOI: https://doi.org/10.1007/978-3-030-82627-7_2
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