June 23, 2013
June 23, 2013
June 26, 2013
Division Experimentation & Lab-Oriented Studies
23.845.1 - 23.845.13
Laboratory Experiment in Engineering Materials for Upper- Level Undergraduate and Graduate StudentsLaboratory experiments are a critical part of the required curriculum for upper-levelundergraduate and graduate students seeking degrees in the science, technology, engineering andmathematics (STEM) fields. These laboratory experiments usually involve materials and/ormaterial properties that were designed to establish an level of specification and implementationmethodology. However, often these laboratory experiments were developed for well definedsystems in controlled environments to take advantage of limited resources such as expensivematerials, laboratory space and testing supplies. Material systems that incorporate a dependenceon more that one parameter for processing and subsequent characterization pose a significantproblem in that the experiment designer may not possess the information to identify the keyparameters that influence the critical properties sought after. The ultimate goal is for the studentexperimental designer to predict parameters and properties based on a limited number ofexperiments or available data.The proposed methodology in this paper describes a general full factorial design for experimentsinvolving the mechanical characterization, specifically the mechanical strength, and processingparameters of a material. This Factorial Design Analysis (FDA) approach facilitates a ‘between-participants’ design analysis that includes more than one independent variable, and has theadvantage over a simple randomized design in that you can test the effect of more than oneindependent variable and the interactive effect of the various independent variables. The methodis validated for the optimization of the boundary conditions that influence the material propertiesof electrodeposited metals. Specifically, a 2k factorial statistical analysis is conducted, analyzed,and a mathematical model derived, to describe how the electrolytes’ boundary conditionsinfluence the mechanical strength of electrodeposited nickel-iron (Ni80Fe20). The critical externalboundary conditions examined for this material system include the current density of theelectrolytic bath, the bath temperature, and the speed of agitation in the bath. Results show theANOVA (analysis of variance) table of results for the critical factors, as well as the F-test on theinteractions. Based on the results, regression models are developed and surface plots presentedfor the mechanical strength of the material system as a function of the external boundaryconditions.
Veazie, D. R. (2013, June), Laboratory Experiment in Engineering Materials for Upper-Level Undergraduate and Graduate Students Paper presented at 2013 ASEE Annual Conference & Exposition, Atlanta, Georgia. 10.18260/1-2--19859
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