Y-shaped Cutting Rig for In-situ X-ray Scattering of Polymers

• Jerry DeSimone, Mechanical Engineering, University of Delaware

• Chelsea Davis, Mechanical Engineering, University of Delaware
• Angie Cardenas, Materials Engineering, University of Delaware

Y-shaped Cutting Rig for In-situ X-ray Scattering of Polymers

Jerry DeSimone1, Angie Rojas Cardenas2, Chelsea Davis1,2

1Mechanical Engineering, 2Materials Engineering, University of Delaware

The molecular structure of polymers strongly influences their mechanical properties, including their strength and fracture behavior. Understanding how molecular structure changes during fracture is important for designing materials with improved performance for applications such as soft robotics and flexible electronics. X-ray scattering is a powerful technique for studying the molecular structure of materials, but there are currently no methods that allow us to characterize the fracture of soft materials with in-situ X-ray measurements. The goal of this project is to design and build a new experimental platform that enables in-situ fracture experiments at the Cornell High Energy Synchrotron Source (CHESS). To achieve this, we use the Y-shaped cutting technique, which minimizes friction, provides a controlled rate of failure, allows systematic adjustment of the cutting conditions, and facilitates in-situ characterization of the sample. We developed the Soft-Matter, Low-Friction, Y-Shaped Cutting Experimental Rig for X-ray scattering (SLYCER-X). Designing the rig required meeting several constraints imposed by the X-ray scattering beamline. The system must have a nearly two-dimensional configuration, fit within an 8 cm profile, and provide sufficient clearance behind the blade tip to allow the X-ray beam to pass through the sample during testing while maintaining the Y-shaped cutting geometry. To meet these requirements, we designed a compact frame that uses a simple platform and pulley system to support the sample while providing the necessary clearance for the X-ray beam. SLYCER-X provides a new experimental platform for combining controlled fracture testing with in-situ X-ray scattering measurements. This instrument will enable future studies of how the molecular structure of soft materials evolves during fracture, helping researchers better understand failure mechanisms and guide the design of improved polymer materials.