A novel simultaneous photoelastic and two‐beam interferometric system: I. Dynamic full‐field evaluation of the elasticity modulus profile of polymeric fibres

Abstract

Summary A novel optical setup for simultaneous capturing of photoelastic and two‐beam interference patterns was designed. The designed optical setup was used to simultaneously record two types of patterns. The first pattern is two‐beam interference pattern, and the second one is photoelastic interference pattern produced by objects under stress. This simultaneous capturing of the two patterns allowed us to calculate the full‐field distribution of the elasticity modulus profile of fibres. A mathematical expression of the profile of the elasticity modulus was derived. This was applied to evaluate the elasticity modulus of anisotropic isotactic polypropylene fibres during stretching processes. The profile of the elasticity modulus was determined for both static and dynamic in situ cases where the propagation of different structural deformations was observed and studied using the designed optical setup. Patterns were given for illustration.

Microscopic investigation of the optical and morphological properties of iPP/TiO2 nanocomposite fibres using computed tomography technique

“…The mechanical performance of polymer fibres, characterised by stiffness and elastic modulus, is of great importance in applications ranging from textiles to structural materials. In iPP fibres doped with TiO 2 nanoparticles, understanding the three‐dimensional distribution of stiffness and elastic modulus 22 provides insights into the structural integrity and potential areas of weakness within the material. This knowledge is crucial for tailoring the material's mechanical properties to meet specific application requirements, ensuring optimal performance in diverse and demanding environments.…”

A novel dynamic opto‐thermo‐mechanical stress testing device 1: Design of the device

“…The refractive index and birefringence are critical parameters in characterizing the behavior of polymeric fibers. Analyzing the changes of the birefringence values throughout processing of a fiber displays the variations of the molecular chains within the structure of the handled fiber (Hamza, Sokkar, El‐Farahaty, & Raslan, ). Therefore, inspecting the variations of the birefringence values allowed us to correlate the physical properties of polymeric fibers to their structure during fiber processing using different stretching procedures.…”