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Abstract Bellows product is an important part in the area of plant engineering, shipbuilding and petrochemistry. For safety and durability it is necessary to consider lots of factors when designing it. This research developed a U-shapedmetal bellows design software based on EJMA 9th Edition manual. This GUI software was developed by using Matlabsoftware and can be able to design four types of bellows, Unreinforced Single Bellows, Unreinforced Double Bellows,Reinforced Single Bellows and Reinforced Double Bellows. The already proven bellows model was designed to verifythis software. We investigated the behavior while changing the thickness of the bellows. As the thickness of bellows increases, spring rate, thrust force, stress increase and fatigue life decreases. This software will be helpful design engineers save time and effort. Key Words : Bellows, EJMA, Fatigue Life, Matlab GUI, Stress     2014 (No. C01813260100413545)    . * Corresponding Author : BongChoon Jang(Andong National Univ.)Tel: +82-10-5132-4081 email: bjang@andong.ac.krReceived December 10, 2014Accepted April 9, 2015Revised (1st February 17, 2015, 2nd March 20, 2015)Published April 30, 2015

Development of U-shaped Metal Bellows design software based on MATLAB