Disbond resistant composite joint and method of forming

Details Disbond resistant composite joint and method of forming Disbond resistant composite joint and method of forming

2007-12-04

2007-12-04

Look, Edward K. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

With measuring, testing, signalling or inspection means

C416S22900R, C029S889600, C029S889710

Reexamination Certificate

active

11074968

ABSTRACT:
A disbond resistant multi-laminate composite product is provided having, a first member; a second member of composite material bonded to the first member; a third member of composite material bonded to at least the second member and being so positioned and arranged such that when the second and third members are stressed at least a portion of the third member will have higher stress than the adjacent second member. The third member preferably has a terminal portion adjacent the second member in which terminal portion the strain energy release rate is higher than in the adjacent second member when the second and third members are stressed. The second and third members are preferably so positioned and arranged such that the third member initiates delamination from the second member before the second member initiates delamination from the first member when the first, second and third members are under stress. A stress level indicator is preferably associated with the third member to measure the stress levels in the third member.

REFERENCES:
patent: 4120610 (1978-10-01), Braswell et al.
patent: 4648800 (1987-03-01), Fradenburgh et al.
patent: 5440193 (1995-08-01), Barrett
patent: 5820344 (1998-10-01), Hamilton et al.
patent: 6544366 (2003-04-01), Hamilton et al.
patent: 6565942 (2003-05-01), Anderson et al.

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