Gregory Taylor, Xin Wang, Leah Mason, Ming C. Leu, K. Chandrashekhara, Timothy Schniepp and Ross Jones
The purpose of this paper is to study the flexural behavior of additively manufacture Ultem 1010 parts. Fused deposition modeling (FDM) process has become one of most widely used…
Abstract
Purpose
The purpose of this paper is to study the flexural behavior of additively manufacture Ultem 1010 parts. Fused deposition modeling (FDM) process has become one of most widely used additive manufacturing methods. The process provides the capability of fabricating complicated shapes through the extrusion of plastics onto a print surface in a layer-by-layer structure to build three-dimensional parts. The flexural behavior of FDM parts are critical for the evaluation and optimization of both material and process.
Design/methodology/approach
This study focuses on the performance of FDM solid and sparse-build Ultem 1010 specimens. Flexure tests (three-point bend) are performed on solid-build coupons with varying build orientation and raster angle. These parameters are investigated through a full-factorial design of experiments (DOE) to determine optimal build parameters. Air gap, raster width and contour width are held constant. A three-dimensional nonlinear finite element model is built to simulate the flexural behavior of the FDM parts.
Findings
Experimental results include flexure properties such as yield strength and modulus, as well as analysis of the effect of change in build parameters on material properties. The sparse-build FDM parts chosen from the experimental tests are simulated based on this developed model. Thermo-mechanical simulation results show that the finite element simulation and experimental tests are in good agreement. The simulation can be further extended to other complicated FDM parts.
Originality/value
From the DOE study, sparse-build coupons with specific build parameters are fabricated and tested for the validation of a finite element simulation.
Details
Keywords
Leah Mason, Mirka Martel and Julie Baer
The flow of international students crossing borders to pursue educational opportunities has been significantly affected by the COVID-19 pandemic, causing higher education systems…
Abstract
The flow of international students crossing borders to pursue educational opportunities has been significantly affected by the COVID-19 pandemic, causing higher education systems worldwide to consider the context and realities of global academic mobility before and after the health crisis. In this chapter, the authors will use primary data on international educational exchange to understand the effects of COVID-19 on internationalization in US higher education. This chapter analyzes international student mobility trends before and during the COVID-19 pandemic, drawing upon comprehensive evidence reported by thousands of US higher education institutions. The chapter then discusses how COVID-19 affected international student mobility to and from US higher education institutions, including supports provided to students and flexibility regarding virtual enrollment. It concludes with a synthesis of the immediate and possible long-term effects on global student mobility patterns.