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The challenge of accessing specialized adhesives designed for strain gageapplications has been highlighted due to failures in logistic chains, requiringthe exploration of local alternatives. A direct simulation of strain gagebonding behavior with two steel plates is infeasible due to the uniqueconstruction of strain gages. Therefore, an indirect simulation method,comparing local alternatives to a widely accepted adhesive, Loctite 496, wasemployed in this study. Two potential replacements, Loctite 401 and Tekbond793, were tested and matched against the benchmark adhesive, with a focus onthe key mechanical properties: Proportional Shear Strain (PSS), ProportionalShear Stress (PSSt), and Apparent Shear Modulus (G*). Loctite 401 exhibited thehighest G*, suggesting its potential use in strain gage installations if G* isconsidered most important. However, Tekbond 793 demonstrated superior PSS,Maximum Shear Stress (MSSt), and Rupture Shear Stress (RSSt) performance,displaying linear behavior even without an accelerator. Surface preparationconsiderations were also discussed, noting that hand abrading results in doublethe surface roughness than using an orbital sander. The study furtheridentified two main regions concerning failure modes related to Ra, with valuesbelow 0.31 {\mu}m causing significant variations in observed mechanicalproperties, pointing towards factors beyond adhesive layer thickness affectingbond properties. Lastly, the general recommendation is the use of anaccelerator for all tested adhesives, while the use of a surface conditionerand neutralizer was found to negatively impact adhesive performance.

Influence of Surface Roughness on Linear Behavior and Mechanical Properties of Three Cyanoacrylate-Based Adhesives Used to Bond Strain Gages