Browsing by Author "Jones, Robert"
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Item Clothing Fit and Self: An Empirical Examination of Fit Factors and Self Evaluation Related to the Confident Clothing Decision and Psychological Well-Being(2023-05) Hossain, Md. Jakir; Chang, Julie; Jones, RobertConsumers’ body image and perception of comfort are closely related to garment fitting, a primary factor in evaluating clothing performance and body comfort. This study uses self-discrepancy theory to examine how fit characteristics (fit preference and performance) affect consumers’ self-evaluations (self-schema, body satisfaction, and self-esteem) and psychological responses (confident clothing decisions and psychological well-being). Non-probability quota sampling was used for the quantitative research approach. A total of 502 data was collected, and SPSS and partial least squares structural equation modeling (PLS-SEM) was used to analyze the data. The results of this study demonstrate that self-discrepancy mediates the relationships among self-schema, self-esteem, and body satisfaction, during consumers’ self-evaluation process and links up the influence of fit factors on their psychological responses. Additionally, Pearson χ2 tests and post hoc analysis confirmed a significant relationship between body characteristics (body size, shape, BMI) and fit preferences. Finally, the theoretical and practical implication of this study was presented.Item Establishing Standardized Test Methods for Evaluating Space Suit Gloves(2023 International Conference on Environmental Systems, 2023-07-16) Jones, Robert; Abney, Morgan; Brady, Timothy; Rhodes, Richard; McFarland, Shane; Settles. Joe; Stephens, Chanel; Hoyle, Andrew; Funk, Andrew; Rodgers, Stephanie,The Artemis space suit glove environmental protection garment (EPG) will be the first line of protection used to shield the crewmember’s hands from the environments encountered during extravehicular activity (EVA). As the Artemis missions will include more extreme environments than those experienced on the International Space Station, development, verification, and validation of gloves poses three key challenges. First, there are no standardized tests defined to evaluate the durability of space suit gloves for the extreme lunar environments, particularly the permanently shadowed regions. Second, there is insufficient data on state-of-the-art glove performance in a lunar environment from which to compare new designs. Third, current ISS glove Thermal Micrometeoroid Garment (TMG) fabrics are unlikely to be sufficient to meet Lunar requirements. It is therefore necessary to define tests to evaluate if gloves can meet new, challenging requirements. This paper focuses on the development of a test procedure to characterize lunar EVA glove fabrics using ASTM standardized test methods and the design and validation of a new standardized test procedure for comparing abrasion resistance between fabrics in lunar-like conditions. The results of testing on twelve candidate EVA glove fabrics are presented.Item Z-2 Architecture Description and Requirements Verification Results(46th International Conference on Environmental Systems, 2016-07-10) Graziosi, David; Jones, Robert; Ferl, Jinny; Scarborough, Steve; Hewes, Linda; Ross, Amy; Rhodes, RichardThe Z-2 Prototype Planetary Extravehicular Space Suit Assembly is a continuation of NASA’s Z series of spacesuits. The Z-2 is another step in NASA’s technology development roadmap leading to human exploration of the Martian surface. The suit was designed for maximum mobility at 8.3 psid, reduced mass, and to have high fidelity life support interfaces. The Z-2 suit architecture is an evolution of previous EVA suits, namely the ISS EMU, Mark III, Rear Entry I-Suit and Z-1 spacesuits. The suit is a hybrid hard and soft multi-bearing, rear entry spacesuit. The hard upper torso (HUT) is an all-composite structure and includes a 2-bearing rolling convolute shoulder with Z-1 Style lower arms and an elliptical hemispherical helmet. The lower torso includes a telescopic waist sizing system, waist bearing, rolling convolute waist joint, hard brief, 2 bearing soft hip thigh, Z-1 style legs, and walking boots with ankle bearings. The Z-2 Requirements Verification Plan includes the verification of more than 200 individual requirements. The verification methods include test, analysis, inspection, demonstration or a combination of methods. Examples of unmanned requirements include suit leakage, proof pressure testing, mass, man-loads, sizing adjustment ranges, internal and external interfaces such as in-suit drink bag, purge valve, and donning stand. Examples of manned requirements include verification of anthropometric range, suit self-don/doff, secondary suit exit method, donning stand self-ingress/egress and manned mobility covering eight functional tasks. The eight functional tasks include kneeling with object pick-up, standing toe touch, cross-body reach, walking, reach to the SIP and helmet visor. This paper will provide an overview of the Z-2 design. Z-2 requirements verification testing was performed with NASA at the ILC Houston test facility. This paper will also discuss pre-delivery manned and unmanned test results as well as analysis performed in support of requirements verification.Item Z-2 Threaded Insert Design and Testing(46th International Conference on Environmental Systems, 2016-07-10) Jones, Robert; Graziosi, David; Ferl, Jinny; Sweeney, Mitch; Rhodes, Richard; Ross, Amy; Scarborough, StephenNASA’s Z-2 prototype space suit contains several components fabricated from an advanced hybrid composite laminate consisting of IM10 carbon fiber and fiber glass. One requirement was to have removable, replaceable helicoil inserts to which other suit components would be fastened. An approach utilizing bonded in inserts with helicoils inside of them was implemented. The design of the interface flanges of the composites allowed some of the inserts to be a “T” style insert that was installed through the entire thickness of the laminate. The flange portion of the insert provides a mechanical lock as a redundancy to the adhesive aiding in the pullout load that the insert can withstand. In some locations it was not possible to utilize at “T” style insert and a blind insert was used instead. These inserts rely completely on the bond strength of the adhesive to resist pullout. It was determined during the design of the suit that the inserts did not need to withstand loads induced from pressure cycling but instead tension induced from torquing the screws to bolt on hardware which creates a much higher stress on them. Bolt tension is determined by dividing the torque on the screw by a k value multiplied by the thread diameter of the bolt. The k value is a factor that accounts for friction in the system. A common value used for k for a non-lubricated screw is 0.2. The k value can go down by as much as 0.1 if the screw is lubricated which means for the same torque, a much larger tension could be placed on the bolt and insert. This paper summarizes testing that was performed to determine a k value for helicoil inserts in the Z2 suit and how the insert design was modified to resist a higher pull out tension.