April 22 - 26, 2024
Seattle, Washington
May 7 - 9, 2024 (Virtual)
Symposium Supporters
2024 MRS Spring Meeting
MF01.05.06

Temperature Dependent Hygromechanical Behavior of Additively Manufactured Nylon (polyamide 6) and ULTEM (polyetherimide) Continuous Carbon Fiber Composites

When and Where

Apr 23, 2024
5:00pm - 7:00pm
Flex Hall C, Level 2, Summit

Presenter(s)

Co-Author(s)

Madeline Morales1,Bradley Lawrence1,Todd Henry1

DEVCOM Army Research Laboratory1

Abstract

Madeline Morales1,Bradley Lawrence1,Todd Henry1

DEVCOM Army Research Laboratory1
Fused deposition modeling (FDM) is used extensively for rapid prototyping with 3D printed thermoplastic materials. Nylon (polyamide 6) is a popular filament material; however, the mechanical properties are known to degrade in the presence of moisture and/or elevated temperature. In contrast, ULTEM (polyetherimide) has higher strength/stiffness and resistance to moisture/temperature but is more expensive. This work compares the impact of hygrothermal conditioning on the flexural strength and modulus of Markforged Onyx (Nylon + chopped carbon fiber) and ULTEM 9085 samples with and without the addition of continuous carbon fibers printed using a Markforged FX20 3D printer. Samples for bend testing were conditioned at 90% RH at 22°C for 26 days, and mass/dimension increase was recorded. 3-point bend testing according to ASTM D7264 was conducted while varying temperature from 22°C (room temperature) to 50°C using an Instron load frame with an environmental testing chamber. The rate of flexural strength/modulus decrease with increasing temperature was compared for the four different materials (Onyx, Onyx + continuous carbon fiber, ULTEM, ULTEM + continuous carbon fiber) in the as-printed and conditioned state. Ductile vs. brittle failure mechanisms are discussed considering the polymer moisture content and microstructure. Fiber-polymer interfacial bonding is also discussed. The results will help inform end users of the optimal material to use given the operating load, moisture, and temperature conditions for their specific application.

Keywords

additive manufacturing | composite

Symposium Organizers

Emily Davidson, Princeton University
Michinao Hashimoto, Singapore University of Technology and Design
Emily Pentzer, Texas A&M University
Daryl Yee, École Polytechnique Fédérale de Lausanne

Symposium Support

Silver
UpNano US Inc.

Session Chairs

Alice Fergerson
Daryl Yee

In this Session