Abstract: “This investigation shows the use of parametric accelerated life testing (ALT) as an approach to discover design deficiencies and alter them in producing a reliable quantitative (RQ) specification. It covers: (1) product BX life that X% of a population is unsuccessful with parametric ALT plan, (2) fatigue analysis, (3) ALTs with modifications, and (4) judgement as to whether the design(s) acquires the targeted BX life. A (generalized) life–stress model by the linear transport process and a sample size equation are proposed. A pneumatic cylinder in a machine tool was utilized as a case investigation. a cylinder was being unsuccessful in a flexible manufacturing system. To reproduce the market failure and alter the design, a parametric ALT was carried out. At 1 st ALT, the metal seal made of nickeliron alloy (36% Ni) partly cracked and had a metal crispy sound in tested cylinder. It was altered by changing the seal material from a metal to a polymer (silicone rubber). At 2 and ALT, the”

Keywords: Parametric ALT, Mechanical product, Pneumatic cylinder, (metal) seal, Leakage, Design flaws