No description available.

No description available.

No description available.

No description available.

No description available.

Wire-arc additive manufacturing (WAAM) is becoming increasingly common for large scale additive manufacturing (AM) applications because of its high deposition rate (2-3 kg/hr.). The rapid temperature changes and subsequent evolution of mechanical properties during AM can lead to large distortion and residual stresses. Finite element modeling of the AM process shows promise to minimize part distortion and residual stresses through improved path planning and process parameter optimization. However, accurate material properties of M250 before and after heat treatment are needed to properly characterize the property evolution from annealed to AM, to aged. Due to limited data on annealed M250, this research presents the mechanical response of solution annealed M250 maraging steel. Testing at temperatures up to 900 degrees Celsius and strain rates from quasi-static to 1 s-1 was performed to provide more representative mechanical properties for AM parts and provide a correlation between AM, aged, and annealed M250 maraging steel.

Between 1963 and 1968, Lyndon B. Johnson struggled to take advantage of increasing instability in Eastern Europe. By negotiating Most Favored Nation trade treaties and using the Import-Export Bank of America to finance "deferred payment" trade arrangements, Johnson hoped to strengthen American and Eastern European relations. Where Johnson failed to arrange new trade agreements he opted for broadening diplomatic ties. Johnson believed advantages to this strategy included weakening Soviet hegemony in the Warsaw nations, generating a new influx of trade to stabilize the American balance of payments, and preventing Soviet expansion into third world nations. I argue that President Johnson was unsuccessful in Eastern Europe because certain segments of Congress would not support deeper ties with Communist nations. Congress' refusal to treat with the Warsaw Nations stemmed from two sources: a refusal to validate the Communist system and increasing American involvement in the Vietnam War. President Johnson promoted improved interactions, desiring stronger East- West ties and weaker Soviet control in the region. Congress endorsed the international isolation of Communist nations, aiming to cause economic collapse in the Communist governments. / History

This dissertation traces the rhetoric of two Philadelphians, attorney John G. Johnson and Dr. Albert C. Barnes, as they collected art with a specific public in mind, namely working Philadelphians around the turn of the twentieth century. The individual bequests and resulting legacy institutions of Johnson and Barnes serve as rich case studies to assess the efforts of collectors to control the reception of their respective collections by the public. These particular histories, exceptional in their own ways, are juxtaposed to offer an objective view onto previously understudied challenges to the status quo, mounted by a few collectors by way of unique discursive practices and the establishment of distinctive single collection institutions, in the formative period for American art museums around the turn of the twentieth century in Philadelphia. The focus is on the two men’s often shared, but eventually divergent, ideas pertaining to art and the public, which can be tracked to relevant discourses that informed those views. At stake in this investigation is the relative tension between the agency of the collectors and the repurposing of their individual collections by future publics. More plainly, the goal is to study the interrelated narratives of collectors, Johnson and Barnes, as they unfolded over the course of the long twentieth century with an eye to what is gained or lost from the unraveling of the deliberate plans left by the collectors, which in both of these cases, included relocating the art work from the original site, leading to coincident shifts in the manner of display and targeted audience. It is not the point of this study to weigh-in on matters of justice regarding the individual cases, rather the goal is to probe the limits of an art collector’s vision held against the dynamic needs of publics, and evaluate what this might mean for the twenty first century. / Art History

In the eighteenth and early nineteenth centuries, the duel of honor functioned as a formal recourse to attacks on a gentleman's reputation. Concurrently, many notable literary figures such as Samuel Johnson, William Gifford, Thomas Moore, and Lord Byron were involved in literary disputes featuring duels or the threat of physical violence, a pattern indicating a connection between authorship and dueling. This study explicitly examines this connection, particularly as it relates to social acceptance, the gentrification of authorship, and the business of publishing. The act of publishing, putting one's work into the public sphere for consumption as well as critique, created an acute sensitivity to issues of honor because publishing automatically broadcast insults or accusations of dishonorable conduct to the reading public. This study requires a grounded discussion of complex, interconnected concepts, specifically: masculine identity, social hierarchy, and violence; satire; dueling; and authorship. Discussion moves from a foundational concern with violence and the assertion of social status, to the relationship between status and honor, to specific modes of defending honor, and finally to the attempt to establish authorship as an honorable profession. Although each of these quarrels exhibits physical violence or the threat of physical violence, these examples also exhibit verbal violence through satiric assaults or an exchange of verbal attacks and parries. As professional writers struggled to overcome the stereotype of the literary hack and gain social respectability, dueling, with either lead or paper bullets, became a way for authors to defend and maintain the fragile social status they had gained. / Master of Arts

La présente maîtrise est réalisée à la demande de Recherche et Développement pour la Défense Canada (RDDC) à Valcartier. Dans un contexte militaire, la capacité à caractériser indépendamment un matériau pour la simulation numérique est primordiale for trois raisons. Premièrement, les matériaux utilisés ne sont pas répandus comme ceux utilisés en aéronautique ou bien en construction automobile. Deuxièmement, les paramètres des matériaux spécifiques au domaine militaire sont rarement divulgués. Troisièmement, l’utilisation d’alliages secrètement développés prohibe la caractérisation par une seconde entité. Le présent projet à pour objectif the permettre au RDDC Valcartier d’effectuer de faon indépendante la détermination des paramètres du modèle Johnson-Cook [1] [2] de matériaux ductiles. Pour arriver à ce point, le modèle Johnson-Cook est présenté à partir de la théorie de la mécanique de l’endommagement des milieux continus (CDM). La méthode de caractérisation proposée par Johnson et Cook dans les références [1] et [2] est introduite. Après quoi, les techniques et moyens expérimentaux nécessaires sont également décrits. Le reste du mémoire se concentre sur les paramètres statiques du modèle (A, B, n, D1, D2, et D3), puisqu’ils sont prédominants dans la modélisation de la mécanique de l’endommagement comparativement aux autres paramètres [2], [16], et [27]. Quelques lacunes sont observées dans la méthode proposée par les auteurs du modèle. Finalement, une amélioration est proposée pour la partie statique de la méthode de caractérisation. La technique utilisée pour cette proposition utilise le système photogrammétrique ARAMIS afin de mesurer les déformations locales des échantillons sur tout la plage de temps et de faciliter la corrélation avec les simulations numériques effectuées avec le code explicit Ls-Dyna. / This Master of Science thesis is realized for the Defence Research and Development for Canada (DRDC) Valcartier. In a military context, the capacity to characterise independently the material for numerical simulation is important for three reasons. First, the material used are not widely used as aeronautical and car industries material. Secondly, the material parameters militarily relevant are rarely published. Thirdly, the used of secretly developed alloys could prevent from its characterisation by an external entity. The aim of the present study is to allow the DRDC Valcartier to self-characterize ductile metals for their simulation with the model Johnson-Cook, proposed in [1] and [2]. To get to this point, the Johnson-Cook model is presented starting from the CDM theory. The characterization method proposed by Johnson and Cook in [1] and [2] is introduced. Then, the experimental tests and equipments are described. After what, the work is focused on the static parameters (A, B, n, D1, D2, and D3), since those parameters are predominant compared with others in damage mechanics [2], [16], and [27]. Few lacks are pointed out of the suggested method. Finally, an improvement of the static part of the characterization method is proposed and tested. This added part includes the used of the photogrammetry system ARAMIS to monitor the experimental tests and simulation of those tests with LS-Dyna.