Deformation rate dependence of the essential and non-essential work of fracture parameters in an amorphous copolyester

J. Karger-Kocsis, T. Czigány, Eric J. Moskala

Research output: Contribution to journalArticle

130 Citations (Scopus)

Abstract

The plane stress fracture toughness of an amorphous copolyester (aCOP) was determined at ambient temperature as a function of the deformation rate (v = 1, 10 and 100 mm min-1) by the essential work of fracture (EWF) concept using tensile-loaded deeply double-edge notched (DDEN-T) specimens. It was established that both specific essential (we) and non-essential or plastic work of fracture (wp) are composed terms linked to yielding (subscript y) and necking (subscript n), respectively. The essential terms, i.e. we,y and we,n, did not change with increasing v. This indicates that by increasing v no alteration in the initial plane stress conditions occurred. The slopes of regression lines fitted for the wy versus ligament (i.e. β′wp,y) and wn versus ligament (β″wp,n) data tended to increase with increasing v. The overall shape parameter of the plastic zone (β) slightly decreased with the deformation rate. The plastic zone was formed by cold-drawing and not via true plastic deformation as evidenced by annealing-induced (just beyond Tg) shape recovery.

Original languageEnglish
Pages (from-to)3939-3944
Number of pages6
JournalPolymer (United Kingdom)
Volume39
Issue number17
Publication statusPublished - Aug 1998

Fingerprint

Ligaments
Plastics
Fracture toughness
Plastic deformation
Annealing
Recovery
Temperature

Keywords

  • Amorphous copolyester
  • Essential work
  • Fracture mechanics

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Deformation rate dependence of the essential and non-essential work of fracture parameters in an amorphous copolyester. / Karger-Kocsis, J.; Czigány, T.; Moskala, Eric J.

In: Polymer (United Kingdom), Vol. 39, No. 17, 08.1998, p. 3939-3944.

Research output: Contribution to journalArticle

@article{ca3bafd368114bcda3f36304a3f71eb6,
title = "Deformation rate dependence of the essential and non-essential work of fracture parameters in an amorphous copolyester",
abstract = "The plane stress fracture toughness of an amorphous copolyester (aCOP) was determined at ambient temperature as a function of the deformation rate (v = 1, 10 and 100 mm min-1) by the essential work of fracture (EWF) concept using tensile-loaded deeply double-edge notched (DDEN-T) specimens. It was established that both specific essential (we) and non-essential or plastic work of fracture (wp) are composed terms linked to yielding (subscript y) and necking (subscript n), respectively. The essential terms, i.e. we,y and we,n, did not change with increasing v. This indicates that by increasing v no alteration in the initial plane stress conditions occurred. The slopes of regression lines fitted for the wy versus ligament (i.e. β′wp,y) and wn versus ligament (β″wp,n) data tended to increase with increasing v. The overall shape parameter of the plastic zone (β) slightly decreased with the deformation rate. The plastic zone was formed by cold-drawing and not via true plastic deformation as evidenced by annealing-induced (just beyond Tg) shape recovery.",
keywords = "Amorphous copolyester, Essential work, Fracture mechanics",
author = "J. Karger-Kocsis and T. Czig{\'a}ny and Moskala, {Eric J.}",
year = "1998",
month = "8",
language = "English",
volume = "39",
pages = "3939--3944",
journal = "Polymer",
issn = "0032-3861",
publisher = "Elsevier BV",
number = "17",

}

TY - JOUR

T1 - Deformation rate dependence of the essential and non-essential work of fracture parameters in an amorphous copolyester

AU - Karger-Kocsis, J.

AU - Czigány, T.

AU - Moskala, Eric J.

PY - 1998/8

Y1 - 1998/8

N2 - The plane stress fracture toughness of an amorphous copolyester (aCOP) was determined at ambient temperature as a function of the deformation rate (v = 1, 10 and 100 mm min-1) by the essential work of fracture (EWF) concept using tensile-loaded deeply double-edge notched (DDEN-T) specimens. It was established that both specific essential (we) and non-essential or plastic work of fracture (wp) are composed terms linked to yielding (subscript y) and necking (subscript n), respectively. The essential terms, i.e. we,y and we,n, did not change with increasing v. This indicates that by increasing v no alteration in the initial plane stress conditions occurred. The slopes of regression lines fitted for the wy versus ligament (i.e. β′wp,y) and wn versus ligament (β″wp,n) data tended to increase with increasing v. The overall shape parameter of the plastic zone (β) slightly decreased with the deformation rate. The plastic zone was formed by cold-drawing and not via true plastic deformation as evidenced by annealing-induced (just beyond Tg) shape recovery.

AB - The plane stress fracture toughness of an amorphous copolyester (aCOP) was determined at ambient temperature as a function of the deformation rate (v = 1, 10 and 100 mm min-1) by the essential work of fracture (EWF) concept using tensile-loaded deeply double-edge notched (DDEN-T) specimens. It was established that both specific essential (we) and non-essential or plastic work of fracture (wp) are composed terms linked to yielding (subscript y) and necking (subscript n), respectively. The essential terms, i.e. we,y and we,n, did not change with increasing v. This indicates that by increasing v no alteration in the initial plane stress conditions occurred. The slopes of regression lines fitted for the wy versus ligament (i.e. β′wp,y) and wn versus ligament (β″wp,n) data tended to increase with increasing v. The overall shape parameter of the plastic zone (β) slightly decreased with the deformation rate. The plastic zone was formed by cold-drawing and not via true plastic deformation as evidenced by annealing-induced (just beyond Tg) shape recovery.

KW - Amorphous copolyester

KW - Essential work

KW - Fracture mechanics

UR - http://www.scopus.com/inward/record.url?scp=0032143206&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032143206&partnerID=8YFLogxK

M3 - Article

VL - 39

SP - 3939

EP - 3944

JO - Polymer

JF - Polymer

SN - 0032-3861

IS - 17

ER -