March 17, 2025
Sajad Hajizade

Sajad Hajizade

Academic Rank: Assistant professor
Address:
Degree: Ph.D in Marine engineering
Phone: 07731222040
Faculty: Faculty of Engineering

Research

Title
Numerical investigation of the effect of repairing marine structures on their strength
Type Thesis
Keywords
وصله كامپوزيتي، ترميم ترك، ضريب شدت تنش(K)، شبيه سازي آباكوس، روش جي انتگرال
Researchers afshin ghasemi (Student) , Sajad Hajizade (Primary advisor) , Saeed Jaamei (Advisor)

Abstract

Background: This study investigates the performance of composite patches in repairing cracks in steel plates. Aim: The aim of the research was to evaluate the impact of various patch characteristics, including material (carbon-epoxy and fiberglass), thickness, and fiber orientation, on stress intensity factor (K), axial stress (S22), and crack opening displacement (COD). Methodology: This study investigates the performance of composite patches in repairing cracks in steel plates using Abaqus software and the J-Integral method. Conclusions: The findings revealed that carbon-epoxy patches resulted in a greater reduction in stress intensity factor and crack opening displacement compared to fiberglass patches. Additionally, increasing the patch thickness and using a 90° fiber orientation aligned with the loading direction led to the most significant reduction in axial stress and stress intensity factor. The use of double-sided patches significantly reduced K and S22 compared to single-sided patches.