Design Factor Analysis of Fiber Metal Laminates under Concentrated Load by Using Design of Experiment

Abstract

This research studied quality engineering design of FML (Fiber Metal Laminate) under concentrated load. 1st DOE (Design of Experiment) was conducted to find out vital few Xs. 16 experiments were performed and their results were statistically analyzed. Pareto chart analysis shows that the thickness of fiber prepreg and metal laminate are more important than the material property of fiber prepreg or stacking sequence angle. Also, the stacking sequence of 1st layup prepreg is more important than that of 2nd layup prepreg. The main effect plots shows that the maximum deflection of FML is minimized with increasing layer thickness and modulus of metal laminate. 2nd DOE was conducted to obtain RSM (Response Surface Method) equation. 27 experiments were conducted. The CCD (Central Composite Design) technique with four factors was used. The coefficient of determination (R2) for the calculated RSM equation was 0.97. Optimum design was conducted using the RSM equation. MMFD algorithm was used to optimum design. Optimum values for thickness of prepreg, thickness of metal, modulus of metal, fiber orientation 1 and fiber orientation 2 are 0.135mm, 0.135mm, 80GPa, 0O, 0O, respectively. Quality engineering design was conducted to find out guideline for control range of design parameter. To acquire six sigma level reliability, the standard deviation of design parameter should be controlled within 1% of average design value