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Surface Mechanical Attrition Treatment (SMAT) of 7075 Aluminum Alloy to Induce a Protective Corrosion Resistant Layer

Description

This paper investigates Surface Mechanical Attrition Treatment (SMAT) and the influence of treatment temperature and initial sample surface finish on the corrosion resistance of 7075-T651 aluminum alloy. Ambient SMAT was performed on AA7075 samples polished to 80-grit initial surface roughness.

This paper investigates Surface Mechanical Attrition Treatment (SMAT) and the influence of treatment temperature and initial sample surface finish on the corrosion resistance of 7075-T651 aluminum alloy. Ambient SMAT was performed on AA7075 samples polished to 80-grit initial surface roughness. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests were used to characterize the corrosion behavior of samples before and after SMAT. Electrochemical tests indicated an improved corrosion resistance after application of SMAT process. The observed improvements in corrosion properties are potentially due to microstructural changes in the material surface induced by SMAT which encouraged the formation of a passive oxide layer. Further testing and research are required to understand the corrosion related effects of cryogenic SMAT and initial-surface finish as the COVID-19 pandemic inhibited experimentation plans.

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2020-05

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Managerial Factors in Effective Workplace Communication: Analyzing the effects of Tailoring Communication Styles and Verbalizing Expectations in the Workplace

Description

This project analyzes the large array of managerial leadership research in congruence with the wide field of workplace communication to attempt to determine the importance of refining communication channels between managers and employees as well as articulate the core competencies

This project analyzes the large array of managerial leadership research in congruence with the wide field of workplace communication to attempt to determine the importance of refining communication channels between managers and employees as well as articulate the core competencies a manager should exhibit when practicing exemplary communication in their respective work environment. The preliminary sections of this thesis will establish the currently existing foundations utilized and narrow the wide range of research available to applicable information regarding positive workplace communication, influencing factors in a feedback loop from the employee’s perspective, as well as leadership aspects and actions a manager can alter or initiate to improve their workplace’s environment through communicational refinement. This research is supplemented with a survey that was administered to Arizona State University student leaders who were involved in coordinating the Regional Business Conference on the Polytechnic campus. The survey data is designed to either confirm or contradict the findings of the literature. The objective of this project is to synthesize an overview of a manager’s responsibilities and recommend actions to tailor and improve workplace communication

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2020-05

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Evaluation of an Original Design for a Cost-Effective Wheel-Mounted Dynamometer for Road Vehicles

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This thesis evaluates the viability of an original design for a cost-effective wheel-mounted dynamometer for road vehicles. The goal is to show whether or not a device that generates torque and horsepower curves by processing accelerometer data collected at the

This thesis evaluates the viability of an original design for a cost-effective wheel-mounted dynamometer for road vehicles. The goal is to show whether or not a device that generates torque and horsepower curves by processing accelerometer data collected at the edge of a wheel can yield results that are comparable to results obtained using a conventional chassis dynamometer. Torque curves were generated via the experimental method under a variety of circumstances and also obtained professionally by a precision engine testing company. Metrics were created to measure the precision of the experimental device's ability to consistently generate torque curves and also to compare the similarity of these curves to the professionally obtained torque curves. The results revealed that although the test device does not quite provide the same level of precision as the professional chassis dynamometer, it does create torque curves that closely resemble the chassis dynamometer torque curves and exhibit a consistency between trials comparable to the professional results, even on rough road surfaces. The results suggest that the test device provides enough accuracy and precision to satisfy the needs of most consumers interested in measuring their vehicle's engine performance but probably lacks the level of accuracy and precision needed to appeal to professionals.

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2018-05

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Pandora: A Play by Abbey Toye

Description

Pandora is a play exploring our relationship with gendered technology through the lens of artificial intelligence. Can women be subjective under patriarchy? Do robots who look like women have subjectivity? Hoping to create a better version of ourselves, The Engineer

Pandora is a play exploring our relationship with gendered technology through the lens of artificial intelligence. Can women be subjective under patriarchy? Do robots who look like women have subjectivity? Hoping to create a better version of ourselves, The Engineer must navigate the loss of her creation, and Pandora must navigate their new world. The original premiere run was March 27-28, 2018, original cast: Caitlin Andelora, Rikki Tremblay, and Michael Tristano Jr.

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2018-05

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Tongues Becoming a Virtuous Woman: A Philosophical and Communicative Approach to Young Women's Speech

Description

Four hundred years after the word "virtuous," came to be associated with a woman's sexuality, today's female adolescent seemingly has everything. Yet, there is a psychological civil war raging in the psyche of the 21st century young American female because

Four hundred years after the word "virtuous," came to be associated with a woman's sexuality, today's female adolescent seemingly has everything. Yet, there is a psychological civil war raging in the psyche of the 21st century young American female because her mind is divided against itself due to the conflicting instructions of who and what she should be. She has so many choices; it is easy to become overwhelmed by them. Today's female youth is threatened. She communicates more and more, but her ability to express herself is inhibited because she is unsure of how to develop an authentic sense of self. It is a hermeneutic understanding of communication and what it means to be "virtuous" that can free young women to cultivate authentic self and continue to make decisions that support such a lifestyle. It is the aim of this thesis to reclaim the word "virtuous" for the benefit of today's young women. Deeper understanding of hermeneutics and communication allow us to view this word in a different light and read the entirety of Proverbs 31 as feminists. Young women have always faced challenges in adolescence, but a return to classical wisdom and philosophy will equip them to further advance themselves and their communities, rather than forcing them into a life of speaking tongue twisters. The virtuous young woman does not know what the future holds, but armed with the lessons of tradition and the fire of hope, she may speak a virtuous magic over the world with a tongue fit for the challenge.

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2018-05

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Communication Strategies for Effective Social Media Use in Local Governments

Description

An information influx and numerous modes of content delivery has resulted in local governments competing for the public's attention. A recent poll from the Public Technology Institute discovered that although 85% of Local Governments use social media to disseminate information

An information influx and numerous modes of content delivery has resulted in local governments competing for the public's attention. A recent poll from the Public Technology Institute discovered that although 85% of Local Governments use social media to disseminate information to their constituents, only 37% have an enterprise-wide social media strategy (PTI, 2017). Without a clear approach towards social media, Local Governments are failing to maximize their voices and often ineffective when reaching out to their constituents. Research has suggested, charisma is a successful tool for capturing an audience's attention and conveying a memorable message. Charisma can also be taught and executed not only through spoken rhetoric but in online social media platforms. Within this study, 18 local government employees participated in an educational workshop on the use of nine non-verbal "Charismatic Leadership Tactics". Participants completed a pre-workshop assignment which was later compared to a post-workshop assignment. Results showed, participants on average, increased their use of Charismatic Leadership Tactics by a mean of 61%. Researchers collected social media analytics one month prior and one month following the workshop from the City's social media accounts in which participants managed. Collectively, of the thirteen social media accounts, the overall total engagement was greater the month after the educational workshop compared to the month before the workshop. These results suggest charisma can be taught, charisma can be conveyed through micro-blogosphere platforms such as Twitter, and the use of Charismatic Leadership Tactics could be responsible for increasing follower engagement with social media content.

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2018-05

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In situ SEM Testing for Fatigue Crack Growth: Mechanical Investigation of Titanium

Description

Widespread knowledge of fracture mechanics is mostly based on previous models that generalize crack growth in materials over several loading cycles. The objective of this project is to characterize crack growth that occurs in titanium alloys, specifically Grade 5 Ti-6Al-4V,

Widespread knowledge of fracture mechanics is mostly based on previous models that generalize crack growth in materials over several loading cycles. The objective of this project is to characterize crack growth that occurs in titanium alloys, specifically Grade 5 Ti-6Al-4V, at the sub-cycle scale, or within a single loading cycle. Using scanning electron microscopy (SEM), imaging analysis is performed to observe crack behavior at ten loading steps throughout the loading and unloading paths. Analysis involves measuring the incremental crack growth and crack tip opening displacement (CTOD) of specimens at loading ratios of 0.1, 0.3, and 0.5. This report defines the relationship between crack growth and the stress intensity factor, K, of the specimens, as well as the relationship between the R-ratio and stress opening level. The crack closure phenomena and effect of microcracks are discussed as they influence the crack growth behavior. This method has previously been used to characterize crack growth in Al 7075-T6. The results for Ti-6Al-4V are compared to these previous findings in order to strengthen conclusions about crack growth behavior.

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2018-05

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An Examination of the Impact of Support Design on 316 Stainless Steel Supports

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The removal of support material from metal 3D printed objects is a laborious necessity for the post-processing of powder bed fusion printing (PBF). Supports are typically mechanically removed by machining techniques. Sacrificial supports are necessary in PBF printing to relieve

The removal of support material from metal 3D printed objects is a laborious necessity for the post-processing of powder bed fusion printing (PBF). Supports are typically mechanically removed by machining techniques. Sacrificial supports are necessary in PBF printing to relieve thermal stresses and support overhanging parts often resulting in the inclusion of supports in regions of the part that are not easily accessed by mechanical removal methods. Recent innovations in PBF support removal include dissolvable metal supports through an electrochemical etching process. Dissolvable PBF supports have the potential to significantly reduce the costs and time associated with traditional support removal. However, the speed and effectiveness of this approach is inhibited by numerous factors such as support geometry and metal powder entrapment within supports. To fully realize this innovative approach, it is necessary to model and understand the design parameters necessary to optimize support structures applicable to an electrochemical etching process. The objective of this study was to evaluate the impact of block additive manufacturing support parameters on key process outcomes of the dissolution of 316 stainless steel support structures. The parameters investigated included hatch spacing and perforation, and the outcomes of interests included time required for completion, surface roughness, and effectiveness of the etching process. Electrical current was also evaluated as an indicator of process completion. Analysis of the electrical current throughout the etching process showed that the dissolution is diffusion limited to varying degrees, and is dependent on support structure parameters. Activation and passivation behavior was observed during current leveling, and appeared to be more pronounced in non-perforated samples with less dense hatch spacing. The correlation between electrical current and completion of the etching process was unclear, as the support structures became mechanically removable well before the current leveled. The etching process was shown to improve surface finish on unsupported surfaces, but support was shown to negatively impact surface finish. Tighter hatch spacing was shown to correlate to larger variation in surface finish, due to ridges left behind by the support structures. In future studies, it is recommended current be more closely correlated to process completion and more roughness data be collected to identify a trend between hatch spacing and surface roughness.

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2018-05

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Design, Characterization, and Evaluation of a Dynamic Soft Robotic Prosthetic Socket Interface

Description

Prosthetic sockets are a static interface for dynamic residual limbs. As the user's activity level increases, the volume of the residual limb decreases by up to 11% and increases by as much as 7% after activity. Currently, volume fluctuation is

Prosthetic sockets are a static interface for dynamic residual limbs. As the user's activity level increases, the volume of the residual limb decreases by up to 11% and increases by as much as 7% after activity. Currently, volume fluctuation is addressed by adding/removing prosthetic socks to change the profile of the residual limb. However, this is time consuming. These painful/functional issues demand a prosthetic socket with an adjustable interface that can adapt to the user's needs. This thesis presents a prototype design for a dynamic soft robotic interface which addresses this need. The actuators are adjustable depending on the user's activity level, and their structure provides targeted compression to the soft tissue which helps to limit movement of the bone relative to the socket. The engineering process was used to create this design by defining system level requirements, exploring the design space, selecting a design, and then using testing/analysis to optimize that design. The final design for the soft robotic interface meets the applicable requirements, while other requirements for the electronics/controls will be completed as future work. Testing of the prototype demonstrated promising potential for the design with further refinement. Work on this project should be continued in future research/thesis projects in order to create a viable consumer product which can improve lower limb amputee's quality of life.

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2018-05

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Educating Future Engineers in the Art of Communication through Presenting

Description

Effective communication and engineering are not a natural pairing. The incongruence is because engineering students are focused on making, designing and analyzing. Since these are the core functions of the field there is not a direct focus on developing communication

Effective communication and engineering are not a natural pairing. The incongruence is because engineering students are focused on making, designing and analyzing. Since these are the core functions of the field there is not a direct focus on developing communication skills. This honors thesis explores the role and expectations for student engineers within the undergraduate engineering education experience to present and communicate ideas. The researchers interviewed faculty about their perspective on students' abilities with respect to their presentation skills to inform the design of a workshop series of interventions intended to make engineering students better communicators.

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2018-05