Work Item
ASTM WK90358
New Test Method for Standard Test Method for Prepreg Tack Using Rolling Resistance
1. Scope
This test method describes a measurement method to quantify tack level for low to medium tack composite prepregs typically used for automated fiber placement. The test method is suitable for the measurement of tack at room temperature as part of material quality control. It may also be used to assess impact of aging, temperature, and humidity on the material tack. For tack measurement method specific to material characterization of different prepreg materials, test parameters, surface combinations, and environmental conditions to provide insight for optimizing process parameters (particularly deposition rate and deposition temperature) for industrial automated material placement processes, refer to ASTM D8336-24, Standard Test Method of Characterizing Tack of Prepregs Using a Continuous Application-and-Peel Procedure.
Keywords
Prepreg tack; Low tack; AFP; automated fiber placement
Rationale
Currently there is no reliable method of screening low tack prepreg materials used in AFP processes. The window of acceptable tack for AFP materials turns out to be relatively tight and often difficult to judge by touch. AFP machines that operate without a cooled creel area can be more challenging for tackier materials. Tack levels that are too high can cause excessive machine maintenance. Tack levels that are too low can cause material laydown issues such as bridging and inaccurate placement.
The title and scope are in draft form and are under development within this ASTM Committee.
Work Item Status
Date Initiated: 04-17-2024
Technical Contact: Wendy Lin