  In this study, we delve into the intricacies of elastoviscoplastic (EVP)
fluids, particularly focusing on how polymer additives influence their
extensional behavior. Our findings reveal that polymer additives significantly
alter the extensional properties of the EVP fluids, such as relaxation time and
extensional stresses, while having negligible impact on the shear rheology.
Interestingly, the modified fluids exhibit a transition from yield stress-like
behavior to viscoelastic-like behavior under high extensional rates, ultimately
leading to destabilization under extreme deformation. This research enhances
the fundamental understanding of EVP fluids and highlights potential
advancements in applications, especially in precision-demanding fields like 3D
printing.
