Influence of Ductility Ingredients of Structural Adhesives on Fracture Energy under Static Mixed-Mode Loading

2017 ◽  
Author(s):  
Satoshi Nakada ◽  
Toru Furusawa ◽  
Eiichiro Yokoi ◽  
R Carbas ◽  
M Costa ◽  
...  
Keyword(s):  
Fracture Energy ◽  
Mixed Mode ◽  
Mixed Mode Loading ◽  
Structural Adhesives

Mixed mode fracture testing of adhesively bonded wood specimens using a dual actuator load frame

Holzforschung ◽  
2010 ◽  
Vol 64 (3) ◽  
Author(s):  
Hitendra K. Singh ◽  
Abhijit Chakraborty ◽  
Charles E. Frazier ◽  
David A. Dillard
Keyword(s):  
Fracture Energy ◽  
Mixed Mode ◽  
Mode I ◽  
Mode Ii ◽  
Mixed Mode Fracture ◽  
Pure Mode ◽  
Mixed Mode Loading ◽  
Mode Mixity ◽  
Adhesively Bonded ◽  
Phase Angles

Abstract An experimental evaluation of mixed mode fracture tests conducted on adhesively bonded wood specimens using a dual actuator load frame is presented. This unit allows the fracture mode mixity to be easily varied during testing of a given specimen, providing improved consistency, accuracy, and ease of testing over a range of loading modes. Double cantilever beam (DCB) type specimens made of southern yellow pine (Pinus spp.) wood substrates bonded with a commercially available one part polyurethane adhesive were tested over a wide range of mode mixities from pure mode I to pure mode II. The critical strain energy release rate (SERR) values were calculated from the measured load, displacement, and crack length data, in combination with material properties and specimen geometric parameters, and compared on a versus fracture envelope plot. Mean quasi-static fracture energy values were calculated to be 390 J m-2 and 420 J m-2 for mode I and mode II fracture, respectively. For various mixed mode phase angles, the critical SERR values were partitioned into mode I and mode II components. In mixed mode loading conditions the cracks were typically driven along the interface, which resulted in lower total fracture energy values when compared with those measured under pure mode I loading conditions. A drop in measured fracture energy of approximately 45% was observed with mode mixity phase angles as small as 16°, implying that engineering designs based on results from the popular mode I DCB test could be nonconservative in some situations. Fracture surfaces obtained at different mode mixities are also discussed. An improved understanding of fracture behavior of adhesively bonded wood joints under mixed mode loading through generation of fracture envelopes could lead to improved designs of bonded wood structures.

scholarly journals Selected Aspects of Cohesive Zone Modeling in Fracture Mechanics

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 302
Author(s):  
Wiktor Wciślik ◽  
Tadeusz Pała
Keyword(s):  
Cohesive Zone ◽  
Mixed Mode ◽  
Review Paper ◽  
Failure Process ◽  
Cohesive Zone Modeling ◽  
Mixed Mode Loading ◽  
Cohesive Models ◽  
Cohesive Modeling ◽  
Zone Modeling ◽  
Intensive Development

This review paper discusses the basic problems related to the use of cohesive models to simulate the initiation and development of failure in various types of engineering issues. The most commonly used cohesive zone models (CZMs) are described. Recent achievements in the field of cohesive modeling are characterized, with particular emphasis on the problem of mixed mode loading, the influence of the strain rate, the stress state triaxiality, and fatigue. A separate chapter of the work is devoted to the identification of cohesive parameters. Examples of the use of CZMs for the analysis of the fracture and failure process in various applications, both on the macro and microscopic scale, are given. The directions of CZMs development were indicated as well as the issues that are currently under particularly intensive development.

scholarly journals Dynamic Crack Curving under Mixed-Mode Loading.

1994 ◽  
Vol 60 (571) ◽  
pp. 720-727
Author(s):  
Akira Simamoto ◽  
Makoto Kosai ◽  
Albert Kobayashi S.
Keyword(s):  
Mixed Mode ◽  
Dynamic Crack ◽  
Mixed Mode Loading ◽  
Crack Curving

Failure initiation at a blunt V-notch tip under mixed mode loading

2008 ◽  
Vol 149 (2) ◽  
pp. 143-173 ◽  
Author(s):  
Elad Priel ◽  
Zohar Yosibash ◽  
Dominique Leguillon
Keyword(s):  
Mixed Mode ◽  
Mixed Mode Loading ◽  
Failure Initiation ◽  
Notch Tip
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