Mode decoupling in interlaminar fracture toughness tests on bimaterial specimens
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The double cantilever beam (DCB) and end-notched flexure (ENF) tests are the standard ones for
determining the interlaminar fracture toughness of composites in opening and shearing, respectively.
The same tests are commonly used to characterize the mode I and mode II interfacial fracture of adhesive
joints. Apart from these classical material cases, there is a growing interest recently in determining the
fracture toughness of, for instance, asymmetrically delaminated composites or dissimilar adhesive joints.
For this purpose, laboratory coupons are being used that feature a material or thickness asymmetry with
respect to the crack plane. This asymmetry introduces mixed-mode I/II fracture to the
specimen, even if the same is loaded in pure mode I or pure mode II
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