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experimental tests results of the propagation of cracks, to determine the characteristic parameters of the cohesive models

Submitted by A.Brick Chaouche on

Good mourning, it is well known that the cohesive forces models permet an easy and less combersome computation of the crack problems, these models formulated in term of stress are accompained with a scale effects because of the presence of a crachteristic lengths like the critical opening/sliding value, and the length of the cohesive zone at the begining of the propagation. In order to set the values of the characteristic lengths of the model used in the simulation for a given material, it is intressting to do that through an experimental tests like a compact tests. My query is, is there any one who have carried out a similar experiments?, i addmit no previous experiance in this field and i appresiate any help in this topic. i'm waiting for any comments,  help, advices, orietation and documents from you. thank you   


We have determined mixed mode cohesive laws by the use of a J integral approach. The theory of extracting mixed mode cohesive laws from J measurements is published here:

     Sørensen, B. F., and Kirkegaard, P., 2006, "Determination of mixed mode cohesive laws", Engineering Fracture Mechanics, vol. 73, pp. 2642-61.

One application of the approach to adhesive joints is here:

     Högberg, J. L., Sørensen, B. F., and Stigh, U., 2007, "Constitutive behaviour of mixed mode loaded adhesive layer", International Journal of Solids and Structures, Vol. 44, pp. 8335-54.

and one application concerning delamination (with large scale bridging) is here:

    Sørensen, B. F., and Jacobsen, T. K., 2009, "Delamination of fibre composites: determination of mixed mode cohesive laws", Composite Science and Technology, Vol. 69, pp. 445-56.

The specimen we use is a DCB (double cantilver beam) specimen loaded with uneven bending moments. For this test configuration, the J integral can be obtained in analytical form even for large-scale bridging problems.

Regards,

Bent
Thu, 02/23/2012 - 22:44 Permalink