Three-dimensional fiber segment orientation distribution using X-ray microtomography.

Area of Science:

• Materials Science
• Textile Engineering
• Physics

Background:

• Fiber orientation significantly impacts nonwoven fabric properties, influencing anisotropy.
• A comprehensive understanding of fabric architecture requires evaluating three-dimensional fiber orientation, including out-of-plane angles.
• Existing methods may not fully capture the complex 3D fiber arrangements in nonwovens.

Purpose of the Study:

• To implement and experimentally validate a technique for measuring fiber segment orientation in three dimensions.
• To analyze fiber orientation distributions in hydroentangled nonwoven fabrics produced by different web laying methods.
• To correlate computed fiber orientation data with physical fabric properties.

Main Methods:

• Utilized X-ray computed microtomography (micro-CT) to acquire volumetric data of nonwoven fabrics.
• Applied a fiber segment orientation measurement technique based on Eberhardt and Clarke's work.
• Extracted fiber orientation distributions using spherical coordinates from micro-CT datasets.
• Performed zero-span tensile testing and z-directional tensile testing for physical property comparison.

Main Results:

• Successfully extracted fiber segment orientation distributions from hydroentangled nonwoven fabrics (parallel-laid, cross-laid, air-laid).
• Demonstrated the capability of micro-CT and the implemented technique to characterize 3D fiber architecture.
• Established a basis for comparing computed orientation with experimentally determined mechanical properties.

Conclusions:

• The study successfully implemented and validated a technique for 3D fiber orientation analysis in nonwovens.
• X-ray computed microtomography provides detailed insights into fabric architecture, essential for property prediction.
• This approach aids in understanding the relationship between manufacturing processes, fiber orientation, and bulk fabric properties.