en Optimization Techniques Optimization Techniques پژوهشي Research <div style="text-align: justify;"><span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:Calibri,sans-serif"><i><span new="" roman="" style="font-family:" times="">Sheet hydroforming is a type of hydroforming in which complex designs are formed from sheet metal using high-pressure fluids. It is a viable alternative to standard stamping or deep drawing, particularly where high precision, fewer tool components, or intricate shapes are required. Optimisation techniques are among the most promising strategies for dealing with real-world situations that involve many goals and limitations. This research proposes a method for optimizing process parameters to achieve good formability in sheet hydroforming of Nimonic 90 alloy using brown bear optimisation and the evaporation water cycle algorithm. The best results achieved through optimization techniques are validated by numerical simulation and experimentally. The outcomes achieved show that brown bear optimisation predicts the best optimal process parameters in maximising deformation and good formability of nimonic 90 alloy in sheet hydroforming.</span></i></span></span></span><span style="text-align: justify;">&nbsp;</span></div> Sheet Hydroforming,Nimonic 90,Forming limit diagram,Formability,Brown bear optimization,Evaporation based water cycle algorithm. 0 0 http://ijiepr.iust.ac.ir/browse.php?a_code=A-10-3522-1&slc_lang=en&sid=1 Fakrudeen Ali Ahamed J fakrudeen.ahamed@utas.edu.om 1800319475328460015222 1800319475328460015222 Yes Lecturer, Mechanical & Industrial Section, College of Engineering and Technology, University of Technology and Applied Sciences- Nizwa, P.O. Box 477, Sultanate of Oman Murali N : murali.naryanamurthy@utas.edu.om 1800319475328460015223 1800319475328460015223 No Lecturer, Mechanical & Industrial Section, College of Engineering and Technology, University of Technology and Applied Sciences- Nizwa, P.O. Box 477, Sultanate of Oman Rohan. M.Vaishta rohanmvashishta@gmail.com 1800319475328460015224 1800319475328460015224 No Tooling Engineer