ميلاد خضري

This study conducts an experimental assessment of enhancing the durability of adhesive joints under combined hydrothermal exposure via surface preparation. To this end, 77 distinct aluminum–aluminum single-lap (SLJ) joint configurations (each tested in triplicate) were fabricated using Araldite2015, with adherend surfaces prepared by laser engraving. For durability eva‎luation, specimens underwent hygrothermal aging for 1 to 8 weeks at 85% relative humidity an‎d 50 °C. The laser texturing program comprised three conventional ±45° oblique benchmarks an‎d two bio-inspired patterns (cobweb an‎d snowflake). For the latter, the effects of laser path length an‎d pattern arrangement were systematically examined, yielding 21 distinct laser designs in total (9 cobweb-inspired, 9 snowflake-inspired, an‎d three ±45° patterns with different engraving lengths). To assess surface quality, WCA an‎d AFM tests were performed; SEM imaging was conducted on fracture surfaces; an‎d mechanical properties were obtained from lap-shear testing. The results indicate that hygrothermal exposure reduces the static strength of SLJ specimens an‎d alters the dominant failure modes; however, joints produced with laser-textured surfaces exhibit greater durability under hygrothermal conditions an‎d mitigate the degradation of joint properties.

اتصالات چسبي , آماده‌سازي سطح ليزري , الهام از طبيعت , پيرسازي , محيط رطوبتي/ حرارتي

Adhesive bonding , laser surface preparation , bio-inspired patterns , aging , hygrothermal environment

Milad Khezri

Dr. Hamed Saeidi Googarchin