Prof. Jose M. Garcia Profile

Prof. Jose M. Garcia

at Purdue Univ

SPIE Involvement:

Author

Publications (3)

Proceedings Article | 22 March 2021 Presentation + Paper

On the performance of additively manufactured CNF/PLA piezoresistive strain sensors

J. Hernandez, C. Maynard, D. Gonzalez, M. Viz, J. Garcia, B. Newell, T. Tallman

Proceedings Volume 11591, 115910B (2021) https://doi.org/10.1117/12.2582165

KEYWORDS: Fused deposition modeling, Structural sensing, Resistance, Printing, Nanofibers, Sensors, Additive manufacturing, Structural health monitoring, Sensor technology, Nondestructive evaluation

Read Abstract +

Robust and adaptable sensor technology is essential for achieving meaningful structural health monitoring (SHM) and integrated nondestructive evaluation (NDE). Unfortunately, prevailing sensor technologies are most often pre-packaged and therefore lack much adaptability. In other words, sensors are rarely structure-specific or application-specific. Rather, an existing pre-packaged sensor must be retrofit to the component or structure under inspection. Multifunctional additive manufacturing (AM) has immense potential to overcome this limitation by permitting stimulus-responsive materials to be printed onto or directly embedded within structures for application-specific sensing. Herein, we explore this concept for strain sensors fabricated via multifunctional AM. Specifically, pelletized polylactic acid (PLA) is modified by the addition of carbon nanofibers (CNFs) at 7.5% by weight. This modification is done through a dry-mix process which is followed by multiple reclaiming and re-extrusion cycles through a single-screw filament extruder. Through this process, the CNFs form an electrically conductive network within the PLA structure. Because the electrical conductivity of the CNFmodified PLA is deformation-dependent (i.e. the material is piezoresistive), the sensors printed from CNF/PLA filament can be leveraged for strain sensing. In this work, we utilize a commercially available fused deposition modeling (FDM) printer to print the CNF-modified PLA into small and thin dog-bone shapes. These sensors then are adhered to a comparatively stiff substrate such that resistance changes across the sensor can be monitored as a function of strain as the substrate is deformed within a load frame. Our preliminary results show that AM-produced CNF-modified PLA strain gauges can indeed be used to track strains consistently. These successful preliminary results show that multifunctional AM has considerable potential for the development of highly adaptive, application-specific, and on-demand sensing technology.

Proceedings Article | 23 April 2020 Presentation + Paper

The effect of extrusion temperature and cycles on electrical resistivity in carbon nanofiber-modified PLA filament for multi-functional additive manufacturing

Cole Maynard, J. Hernandez, D. Gonzalez, T. Tallman, J. Garcia, B. Newell

Proceedings Volume 11379, 113791O (2020) https://doi.org/10.1117/12.2557298

KEYWORDS: Multifunctional materials, Fused deposition modeling, Additive manufacturing, Manufacturing, Printing, Sensors, Carbon, Polymers, Structural health monitoring

Read Abstract +

Proceedings Article | 14 March 2017 Presentation + Paper

3D printed optical phantoms and deep tissue imaging for in vivo applications including oral surgery

Brian Bentz, Alfonso Costas, Vaibhav Gaind, Jose Garcia, Kevin Webb

Proceedings Volume 10056, 1005607 (2017) https://doi.org/10.1117/12.2253763

KEYWORDS: Tissue optics, 3D image processing, Surgery, 3D printing, Optical imaging, Diffusion, Optical tomography, Tomography, Luminescence, Optical phantoms, Mouth, Calibration, Absorption, Printing, Scattering, Tissues

Read Abstract +

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years