Abstract
AbstractFractography has been used for the postfailure analysis of a filled thermoplastic polyester. The five fracture modes that were previously defined on the basis of macroscopic stress–strain behavior were distinguished by certain fractrographic features. These features were characteristic of the fracture mode and did not depend on filler type or filler content. The Mode A ductile fracture surface consisted of two regions: a pullout region of slower crack growth and a rosette region of faster crack growth. The Mode B ductile fracture surface contained only a ductile pull out texture. The Mode C quasi‐brittle fracture surface exhibited secondary fracture features that sometimes included the herringbone pattern. The Mode D quasi‐brittle fracture surface consisted of a stress‐whitened dimple region and a brittle fracture region. The Mode E Fracture surface exhibited primarily the rough texture characteristic of brittle fracture. The failure mechanisms inferred from analysis of the fracture surfaces confirmed a microscopic failure model of the ductile‐to‐quasi‐brittle transition in filled PETG that is based on the strain‐hardening strength of the polymer ligaments between debonded filler particles. © 1994 John Wiley & Sons, Inc.
Published Version
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