[19p-S322-1~14] 1.5 Instrumentation, measurement and Metrology

[19p-S322-14] Direct visualization of stress distribution in adhesive

〇Nao Terasaki¹, Yuki Fujio¹ (1.AIST, am-ri)

Keywords:mechanoluminescense,adhesive,visualization

Elasticoluminescent material is a novel ML functional ceramic powder (controllable size: 10 nm-100 μm, representative and the most efficient ML material: SrAl₂O₄:Eu₂₊) and it can emit intensive light repeatedly accompanied by mechanical stress such as deformation, friction, impact, even in elastic deformation region. The ML intensity is proportional to strain energy of the material. Thus, when dispersedly coated onto a structure, each particle acts as a sensitive mechanical sensor, while the two-dimensional (2D) emission pattern of the whole assembly reflects the dynamical strain or stress distribution inside the structure and the mechanical information around the defect and crack or the invisible tip.
Here, we would like to discuss on suitability of the novel method using the mechanoluminescent (ML) technique for diagnosing (1) a stress distribution in adhesive, (2) adhesion strength between metal interface and adhesive, and (3) a stress contribution of adhesive and fiber in CFRP (carbon fiber reinforced plastic).