Mohd Radzi, Muhammad Haiqal, and mohd azhar harimon. “The Effects of U-Shaped Side Groove on the Fracture Properties of Aluminium Alloy 6061 Using Finite Element Method Analysis”. Research Progress in Mechanical and Manufacturing Engineering, vol. 2, no. 2, Jan. 2022, pp. 877-84, https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/4814.