Impact of cDLP Process Parameters on the Tensile Properties of ELAST-BLK 10

Impact of cDLP Process Parameters on the Tensile Properties of ELAST-BLK 10

Presenter(s)

Asma Ul Hosna Meem, Kyle Rudolph

Description

Continuous digital light processing (cDLP) is an emerging vat-photopolymerization-based 3D-printing technology where full layers of photosensitive resin are irradiated and cured with projected UV light to create a three-dimensional part layer-by-layer. Recent breakthroughs in polymer chemistry have led to a growing number of UV-curable elastomeric photoresins developed exclusively for vat photopolymerization additive manufacturing (AM). Coupled with the practical manufacturing advantages of cDLP AM (e.g., industry-leading print speeds and sub-micron print resolution), these novel elastomeric photoresins are compelling candidates for emerging applications requiring extreme flexibility, stretchability, conformability, and mechanically-tunable stiffness (e.g., soft robotic actuators, stretchable electronics, cellular metamaterials, and anatomical models for surgical prep). To advance the role of cDLP AM in these novel and promising technological spaces, a fundamental understanding of the impact of cDLP manufacturing process parameters on mechanical properties is requisite. This talk highlights our recent efforts to explore the process-property relationship for ELAST-BLK 10, a new ultra-soft, cDLP-printed, UV-curable elastomer. A full factorial design of experiments was used to investigate the effect of build orientation and layer thickness on the quasi-static tensile properties (small-strain elastic modulus, ultimate tensile strength, and elongation at fracture) following ASTM D412. Statistical results, based on a general linear model via ANOVA methods, indicate that specimens with a flat build orientation exhibit the highest Young’s modulus, ultimate tensile strength, and elongation at fracture, likely due to higher crosslink density. Several popular hyperelastic constitutive models (e.g., Yeoh, Gent, and Ogden) were calibrated to our quasi-static tensile data for implementation in commercial finite element software.

Publication Date

4-22-2020

Project Designation

Graduate Research

Primary Advisor

Robert L. Lowe

Primary Advisor's Department

Mechanical and Aerospace Engineering

Keywords

Stander Symposium project, School of Engineering

United Nations Sustainable Development Goals

Industry, Innovation, and Infrastructure; Responsible Consumption and Production

Impact of cDLP Process Parameters on the Tensile Properties of ELAST-BLK 10

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