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East Moline, IL, United States

Sahay S.S.,John Deere Asia Technology Innovation Center | El-Zein M.,John Deere Moline Technology Innovation Center
Surface Engineering | Year: 2011

The potential of residual stress engineering for developing leaner, greener, and safer design is discussed. The technique can be successfully employed at the design stage in the transportation sector and creates significant value by reducing the product's weight, cost, and carbon footprint. It is possible to estimate the compressive residual stresses in the carburized automotive gears or transmission components through residual stress engineering. The superposition of the compressive residual stresses on the externally applied load will result in overall reduction in stresses. Incorporation of residual stresses at the design stage for carburized gears will result in considerable weight reduction for a specified performance. These weight reduction and cost savings opportunities can also be used to create a more effective business case for the new processes, such as low pressure carburizing and gas quenching. Source

Lopez R.D.,John Deere Moline Technology Innovation Center
Materials Evaluation | Year: 2013

Fluorescent detection media for nondestructive testing were originally designed around the mercury vapor lamp, but both the media and the types of excitation sources available have changed with time. Experiments were performed to determine if recent advancements in radiation sources offered improvement over mercury vapor excitation. Excitation spectra of fluorescent penetrants and magnetic particle detection media, as well as the emission spectra of common excitation radiation sources, were obtained; these were used to understand why an indication is brighter with a given exciter. Efficient excitation occurs when the output from an exciter corresponds well with the preference of a detection medium. This paper offers judgment regarding the optimal excitation source based on detection media brightness. Exciters were also evaluated by their maximum irradiance, illuminance, warm-up time, useful irradiance area and battery life. Source

Lopez R.D.,John Deere Moline Technology Innovation Center
Materials Evaluation | Year: 2012

A quantitative evaluation of the relative effect of various safety glasses on inspection sensitivity was performed. This work characterized lens transmission spectra, determined penetrant and magnetic particle test media fluorescent emission spectra, measured ultraviolet A radiation source emission spectra, and determined the effect of lens choice on the fluorescent luminance of typical test media. Experimental data showed that not all lenses are equal, and one amber lens allowed a greater amount of fluoresced light from indications through to the technician's eyes, compared to its clear counterpart. Source

Tutuncu G.,Iowa State University | Tutuncu G.,John Deere Moline Technology Innovation Center | Motahari M.,Iowa State University | Bernier J.,Lawrence Livermore National Laboratory | And 4 more authors.
Journal of the American Ceramic Society | Year: 2012

Strain and texture evolution (domain switching) of polycrystalline, ferroelectric BaTiO3 was investigated in four-point bending geometry. Lattice strains were measured by in situ synchrotron X-ray diffraction to address problems related to modeling the constitutive behavior of highly asymmetric ferroelectrics. The hkl-dependent strain measured by X-ray diffraction was found to be smaller relative to both bulk strain measured by conventional, contact-based techniques and elastically computed strain, and reasons for this inconsistency are discussed. A self-consistent model with capabilities of quantifying domain switching and estimating hkl-dependent strain is applied to allow a direct comparison with diffraction data. © 2012 The American Ceramic Society. Source

Sahay S.S.,John Deere Asia Technology Innovation Center | Mohapatra C.,John Deere Asia Technology Innovation Center | Caster R.,John Deere Moline Technology Innovation Center
Advanced Materials and Processes | Year: 2014

Modern industrial heat treating operations have sophisticated IT architectures, where significant amounts of data in GB/TB per year are generated including characteristics of input material, process parameters and product quality are generated. For example, many surprises about process and product can emerge from process analysis and modeling, where the insight generated from this approach could directly impact product quality and design recommendations. In contrast, physics-based models can also lead to an optimum operating condition, which is far removed from current conditions. Physics-based models for heat treating operations incorporate mass and energy conservation, laws of heat transfer, metallurgical thermodynamics, and chemical reactions and kinetics. Because of the non- isothermal effect, accelerated annealing kinetics with a reduction in heating rate was observed through physics-based modeling and laboratory kinetics experiments. Source

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