blakmax... far more to this subject than meets-the-eye.
To understand fatigue aspects of adhesive bonded structures You must first understand the permutations of the subject, starting with basic adhesive-bonding principles [materials, preparation, etc], affects of the environment, structural geometry, loading, etc... such as...
Aluminum alloys/tempers; bare or clad?
Adhesive bonding process/materials selection...
PAA process... ASTM D3933? SAE ARP1524? Corporate? Other?
Test adhesive bonding primer and application process over PAA [... or NONE].
Test adhesive and application/curing/handling process variables [cure temperatures, pressures, time, etc].
Bonded test specimen configuration? coupon or structure? Special shaping/tapering of the metallic elements? Metal-to-metal? Metal-honeycomb/core-metal? 100% load transfer or shared load transfer? constant amplitude or spectrum loading; Fasten-bonded; test environment [dry, seacoast] and high-temp/low-temp or spectrum-temp; added effects of peel, eccentricity, creep, etc?
Etc...
As far as Your basic question... 'learning tools' I've ever had on the subject of adhesive bonded-structure strength and durability are as follows [readily available on-line]...
Douglas PABST study... Primary Adhesive Bonded Structures Technology... done in the 1970s into the early 1980s. A comprehensive look at every aspect of structural [mostly aluminum structures] adhesive bonding and the influence of every aspect on strength and durability. Most of the important elements of PABST documentation [many volumes] are available on the DTIC website with some hard searching.
NASA and WR-lab reports, many done by companies or universities under contract, this subject.
MIL-A-83376 ADHESIVE BONDED METAL FACED, SANDWICH STRUCTURES, ACCEPTANCE CRITERIA
MIL-HDBK-337 ADHESIVE BONDED AEROSPACE STRUCTURE REPAIR [elements CX]
MIL-HDBK-349 MANUFACTURE AND INSPECTION OF ADHESIVE BONDED, ALUMINUM HONEYCOMB SANDWICH ASSEMBLIES FOR AIRCRAFT
MIL-HDBK-691 ADHESIVE BONDING [CX]
MIL-HDBK-725 ADHESIVES: A GUIDE TO THEIR PROPERTIES AND USES AS DESCRIBED BY FEDERAL AND MILITARY SPECIFICATIONS
MIL-HDBK-83377 ADHESIVE BONDING (STRUCTURAL) FOR AEROSPACE AND OTHER SYSTEMS, REQUIREMENTS FOR
AMS3920 Acceptance Criteria Adhesive-Bonded Metal-Faced Sandwich Structures
SAE ARP1524 Surface Preparation and Priming of Aluminum Alloy Parts for High Durability Structural Adhesive Bonding
If You work for any of the 'big-box aerospace companies', there are likely to be many documents/studies/processes available that are corporate proprietary.
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]