Fracture mechanics criterion of time-dependent crack initiation from interface free-edge in adhesively bonded butt joints

•Time-dependent crack initiation from interface free-edge is experimentally evaluated.•Crack initiation life varied four orders of seconds with nominal stress change.•Fracture criterion successfully expressed by creep stress/strain singular parameters. The time-dependent crack initiation from the in...

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Published inEngineering fracture mechanics Vol. 186; pp. 368 - 377
Main Authors Takahashi, Yoshimasa, Inoue, Kosuke, Takuma, Masanori, Saitoh, Ken-ichi, Sato, Tomohiro
Format Journal Article
LanguageEnglish
Published New York Elsevier Ltd 01.12.2017
Elsevier BV
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Abstract •Time-dependent crack initiation from interface free-edge is experimentally evaluated.•Crack initiation life varied four orders of seconds with nominal stress change.•Fracture criterion successfully expressed by creep stress/strain singular parameters. The time-dependent crack initiation from the interface free-edge of adhesively bonded axisymmetric columnar butt joints (epoxy/SUS, edge shape: 90°/90°) was investigated in detail. With the change of applied stress level, σn, the butt joints exhibited crack initiation life, tC, that varied about four orders of seconds (102–106 s). Such a clear time-dependent life property was then studied in terms of the fracture mechanics. The near-edge stress/strain field at the crack initiation was numerically evaluated with the finite element method (FEM) by applying the time-hardening creep law to the epoxy resin. It was found that the critical asymptotic stress field along the interface represented by the combination of two parameters, λσcr (creep stress singularity index) and Kσcr (creep stress intensity factor), satisfies a unique relation irrespective of (σn, tC) sets. The same tendency was also confirmed when the near-edge total strain field parameters were employed. These results indicate that the K-λ criterion, originally developed for static fracture problems, still holds its validity in the time domain.
AbstractList The time-dependent crack initiation from the interface free-edge of adhesively bonded axisymmetric columnar butt joints (epoxy/SUS, edge shape: 900/900) was investigated in detail. With the change of applied stress level, a~, the butt joints exhibited crack initiation life, tc, that varied about four orders of seconds (102_102 s). Such a clear time-dependent life property was then studied in terms of the fracture mechanics. The near-edge stress! strain field at the crack initiation was numerically evaluated with the finite element method (FEM) by applying the time-hardening creep law to the epoxy resin. It was found that the critical asymptotic stress field along the interface represented by the combination of two parameters, ?~Sj (creep stress singularity index) and K~ (creep stress intensity factor), satisfies a unique relation irrespective of (cn, tc) sets, The same tendency was also con- firmed when the near-edge total strain field parameters were employed. These results indicate that the K-X criterion, originally developed for static fracture problems, still holds its validity in the time domain.
•Time-dependent crack initiation from interface free-edge is experimentally evaluated.•Crack initiation life varied four orders of seconds with nominal stress change.•Fracture criterion successfully expressed by creep stress/strain singular parameters. The time-dependent crack initiation from the interface free-edge of adhesively bonded axisymmetric columnar butt joints (epoxy/SUS, edge shape: 90°/90°) was investigated in detail. With the change of applied stress level, σn, the butt joints exhibited crack initiation life, tC, that varied about four orders of seconds (102–106 s). Such a clear time-dependent life property was then studied in terms of the fracture mechanics. The near-edge stress/strain field at the crack initiation was numerically evaluated with the finite element method (FEM) by applying the time-hardening creep law to the epoxy resin. It was found that the critical asymptotic stress field along the interface represented by the combination of two parameters, λσcr (creep stress singularity index) and Kσcr (creep stress intensity factor), satisfies a unique relation irrespective of (σn, tC) sets. The same tendency was also confirmed when the near-edge total strain field parameters were employed. These results indicate that the K-λ criterion, originally developed for static fracture problems, still holds its validity in the time domain.
Author Inoue, Kosuke
Takahashi, Yoshimasa
Takuma, Masanori
Saitoh, Ken-ichi
Sato, Tomohiro
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Keywords Time-dependent
Free-edge
Fracture criterion
Interface
Crack initiation
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  article-title: Dominant stress region for crack initiation at interface edge of microdot on a substrate
  publication-title: Eng Fract Mech
  doi: 10.1016/j.engfracmech.2006.04.019
– volume: 35
  start-page: 1385
  year: 1998
  ident: 10.1016/j.engfracmech.2017.08.017_b0070
  article-title: Boundary element analysis of the stress singularity at the interface corner of viscoelastic adhesive layers
  publication-title: Int J Solids Struct
  doi: 10.1016/S0020-7683(97)83292-1
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Snippet •Time-dependent crack initiation from interface free-edge is experimentally evaluated.•Crack initiation life varied four orders of seconds with nominal stress...
The time-dependent crack initiation from the interface free-edge of adhesively bonded axisymmetric columnar butt joints (epoxy/SUS, edge shape: 900/900) was...
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SubjectTerms Adhesive bonding
Adhesive joints
Bonded joints
Butt joints
Crack initiation
Cracks
Criteria
Edge stresses
Epoxy resins
Finite element method
Fracture criterion
Fracture mechanics
Fractures
Free-edge
Interface
Joining
Strain
Stress intensity factors
Time dependence
Time-dependent
Title Fracture mechanics criterion of time-dependent crack initiation from interface free-edge in adhesively bonded butt joints
URI https://dx.doi.org/10.1016/j.engfracmech.2017.08.017
https://www.proquest.com/docview/2008897569
Volume 186
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