Evolution of surface topography in one-dimensional laser machining of structural alumina

Vora, Hitesh D.; Santhanakrishnan, Soundarapandian; Harimkar, Sandip P.; Boetcher, Sandra K. S.; Dahotre, Narendra B.

doi:10.1016/j.jeurceramsoc.2012.06.015

Cited by 60 publications

(33 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the computational domain of the model, it was assumed that the material density , the dynamic viscosity , the thermal conductivity k, and the equivalent specific heat capacity C p can be represented as follows [17,22]: where the subscripts 1, s, l, and g refer to the solid-liquid mixed phase, the solid phase, the liquid phase, and the gaseous phase, respectively, L m is the latent heat of the molten metal, L v is the vaporisation latent heat, and T is the temperature span of the semiliquid, with a value of one-half the difference between T L and T S .…”

Section: Fluid Flowmentioning

confidence: 99%

Numerical simulation of single-pulse laser ablation for dressing a bronze-bond diamond grinding wheel

Zhou

Deng

Chen

et al. 2016

Precision Engineering

View full text Add to dashboard Cite

Section: Fluid Flowmentioning

confidence: 99%

Numerical simulation of single-pulse laser ablation for dressing a bronze-bond diamond grinding wheel

Zhou

Deng

Chen

et al. 2016

Precision Engineering

View full text Add to dashboard Cite

“…. The material properties of alumina and the laser machining parameters used for model and experiments are enumerated in Table . The phase change effect also influences the variation in the magnitude of specific heat ( C p ), and therefore, temperature‐dependent specific heat ( C p ) was used in the computational model, which is expressed by Eqs.…”

Section: Multistep Computational Modelmentioning

confidence: 99%

“…In light of this, the present authors have employed an integrated computational and experimental methodology to understand the influence of single and multiple laser pulses during laser machining of structural alumina and its effects on surface roughness . To avoid redundancy, the detailed discussion on the laser–material interaction and physical phenomena involved that drive the process of generating surface roughness/profile can be found elsewhere . Based on the results of these works, the surface roughness was found to increase with an increase in average laser energy density and pulse rate (10, 20, 30, 40, and 50 pulses per second).…”

Section: Introductionmentioning

confidence: 99%

“…In an extension of these works, this article investigated the influence of pulse mode moving laser beam (multiple laser pulses and stationary workpiece) on the surface topography (finish/roughness) during laser machining via an integrated computational and experimental approach to mimic/replicate the generic cutting process. This integrated approach overcomes the difficulties associated with the in situ measurements (temperature, cooling rates, surface roughness, etc.)…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Laser Machining of Structural Alumina: Influence of Moving Laser Beam on the Evolution of Surface Topography

Vora

Dahotre

2014

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Laser machining technique has emerged as an innovative tool to effectively machine the structural ceramics, which previously was nearly impossible using various conventional machining techniques. However, obtaining a desired surface finish via laser machining is still a critical issue. As many physical phenomena act simultaneously during laser machining, it is very difficult to understand their influence in real time and predict the surface topography. To address this issue, a multiphysics‐based finite‐element modeling approach was implemented to understand the influence of moving laser beam (with lateral overlap) on the generation of corresponding surface topography/profile/roughness during laser machining of structural alumina. A computation model that coupled heat transfer and computational fluid dynamics was designed to understand the combined influence of Marangoni convection, recoil pressure, cooling rates, and surface tension on the evolving surface topography during laser machining of structural alumina under various machining conditions. Both computational and experimental results evidently showed the systematic increase in surface roughness parameters with the increase in lateral overlap (0, 17, 33, 50, 67, and 83%). The results of the computational model are also validated by experimental observations with reasonably close agreement (±3.5%).

show abstract

“…Samant and Dahotre 18) developed a comprehensive model for one-dimensional machining of ceramics, being able to predict removed depth from laser parameters and material properties; Vora et al 19) modeled the evolution of surface quality. Threedimensional machining, however, is not fully developed and still has limited industrial use, 20),21) therefore further work is required.…”

Section: Introductionmentioning

confidence: 99%

Surface morphology and fracture strength analysis of nanosecond ablated alumina

Gomes

Hallmann

Daniel

et al. 2015

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

Although the research on laser ablation advances steadily, mainly on ultra-short pulses (in the order of pico-and femtoseconds), research on the low-cost and low-power-consuming nanosecond regime (>100 ns) is relatively scarce. This process is still difficult to predict, due to the many simultaneous and interacting physical processes that take place in a relatively short time. This study provides an experimental analysis for a ytterbium pulsed fibre-laser on Al 2 O 3 , by evaluating surface morphology and fracture strength for two sets of parameters. A very well-defined difference in removal rate and resulting surface topographies was observed, suggesting a threshold point between distinct ablation mechanisms. Laser machining also caused a clear increase on the Weibull modulus, while reducing the characteristic stress.

show abstract

Evolution of surface topography in one-dimensional laser machining of structural alumina

Cited by 60 publications

References 30 publications

Numerical simulation of single-pulse laser ablation for dressing a bronze-bond diamond grinding wheel

Numerical simulation of single-pulse laser ablation for dressing a bronze-bond diamond grinding wheel

Laser Machining of Structural Alumina: Influence of Moving Laser Beam on the Evolution of Surface Topography

Surface morphology and fracture strength analysis of nanosecond ablated alumina

Contact Info

Product

Resources

About