Shear modulus loss as damage indicator of structural integrity in bonded joints

Damage in single lap joints under shear load was assessed. Specimens were tested accordance with ASTM D1002-10(2019). Controls taken on adhesive and surface preparation, thickness, load-specimen alignment. Digital Image Correlation used to measure stresses over the adhesive, modulus variation percent of damage Results show losses against stress. Finally, early evolution determined up 10% rate later, increasing 70%-96%.