On the energetics of dislocation emission from a crack tip in nickel containing hydrogen

1994 ◽  
Vol 9 (7) ◽  
pp. 1805-1819 ◽  
Author(s):  
Richard G. Hoagland
Keyword(s):  
Slip Plane ◽  
Crack Tip ◽  
Substantial Effect ◽  
Total Work ◽  
Dislocation Emission ◽  
Atom Pairs ◽  
Lattice Resistance ◽  
The Creation ◽  
Overall Resistance ◽  
Work Done

A method that determines the work done in shearing atom pairs straddling the slip plane, Φ, during emission of dislocations from a crack tip in an atomic model is presented. The model is based on an EAM-type potential for nickel. The dislocations are emitted as partials, and the disregistry, Δ, across the slip plane is found to be fit accurately by a simple arctan function of position for each partial. The width of the partials is also found to remain essentially constant as they are emitted and move away from the crack tip. Rice's unstable stacking energy is extracted from the Φ - Δ curves for the atom pairs along the slip plane and is observed to vary somewhat, particularly near the crack tip. In addition to the Φ (Δ) at points on the slip plane, the total work done on the entire slip plane is determined as a function of the dislocation position in the spirit of the Peierls approach. The derivative of this total work with respect to dislocation position leads to the lattice resistance, ŝr. The first partial dislocation to be emitted experiences a maximum in ŝr at about 0.2 nm from the crack tip, and several contributions to the overall resistance can be identified including the creation of a new surface at the tip as emission occurs, the creation of stacking fault as the dislocation glides away from the tip, and a small but discernible periodic component with a period related to the lattice. A string of hydrogen interstitials is introduced at various locations in the lattice and its effect on Δ, Φ - Δ curves along the slip plane, and the lattice resistance is examined. A substantial effect on the unstable stacking energy results as the dislocation passes an interstitial on the slip plane, but the effect of an interstitial on the resistance to dislocation emission expressed in terms of the maximum ŝr is small and then only if it is confined to a region very near the crack tip. The significance of these results is discussed together with some additional observations including dislocation pinning on the interstitials.

Effect of Hydrogen on Dislocation Emission from a Crack Tip in Nickel

1992 ◽  
Vol 291 ◽  
Author(s):  
Richard G. Hoagland
Keyword(s):  
Barrier Height ◽  
Slip Plane ◽  
Crack Tip ◽  
Dislocation Motion ◽  
Dislocation Emission ◽  
Intrinsic Resistance ◽  
Dislocation Glide ◽  
Atomic Models ◽  
Work Done

ABSTRACTA method for determining the intrinsic resistance to dislocation emission and glide in atomic models is presented and applied to EAM models of nickel containing a single-ended crack tip. The method is an adaptation of the Peierls approach in which the work done on the glide plane is computed as a function of dislocation position and its derivative is the intrinsic resistance to dislocation motion. The results indicate that there are two parts to the resistance dislocation glide from the crack tip: a distinct barrier to injection of the dislocation from the crack tip and a periodic resistance associated with the lattice. When a hydrogen interstitial is placed on the slip plane near the crack tip the barrier height is reduced but its width is increased.

ASO GUMBALO SEBAGAI INSPIRAS DALAM PENCIPTAAN SENI LUKIS

2018 ◽  
Vol 7 (2) ◽  
pp. 178
Author(s):  
Satri Yadi ◽  
Yuniarti Munaf ◽  
Dhasono Dhasono
Keyword(s):  
Design Phase ◽  
Symbolic Expression ◽  
Ethical Research ◽  
Process Stage ◽  
Form Processing ◽  
The Future ◽  
The Creation ◽  
Visual Strategies ◽  
Work Done ◽  
Exploration Phase

AbstrakAso Gumbalo dalam penciptaan karya seni lukis diilhami dari kehidupan pengembala yang menjadi inspirasi pencipta yang diungkap melalui media seni lukis dengan mengambil ide “Harapan Pengembala” (Aso Gumbalo). Harapan Gembala dapat diartikan sebagai keinginan, kecendrungan dan dorongan hati yang kuat terhadap sesuatu hal yang ingin direalisasikan untuk menjadikan seorang lebih baik dimasa depan. Pengekspresian ide cipta berangkat dari fenomena Aso Gumbalo yang pencipta ungkap dengan ekspresi simbolik kedalam penciptaan karya seni lukis. Metode penciptaan karya ini melalui tahapan yaitu; 1) Tahap eksplorasi adalah tahap pencarian ide-ide dengan melakukan riset emik dan etik untuk pembuatan karya, 2) Tahap perancangan yaitu tahap pembuatan purwarupa yang akan diwujudkan kedalam bentuk karya seni lukis, 3) Tahap proses garapan karya. Konsep dari penciptaan karya merupakan ekspresi simbolik dengan memanfaatkan idiom tradisi, ekspresi tersebut digambarkan pada perwujudan karya menggunakan strategi media dan strategi visual dengan menggunakan konsep pengolahan bentuk, yaitu disformasi dan transformasi dengan melakukan penggabungan beberapa teknik antara lain, teknik plakat, transparan, tekstur semu dan tekstur nyata. Aso Gumbalo sebagai inspirasi yang diungkapkan dalam bentuk karya seni lukis ekspresi simbolik. Karya-karya yang diciptakan pengkarya disajikan dalam bentukpameran.           Kata Kunci:aso gumbalo, ekspresi simbolik, seni lukis.   AbstractAsoGumbalo in the creation of painting works was inspired from the life of the shepherd who became the inspiration of the creator which revealed through the medium of painting by taking the idea of "Hope of the Shepherd" (AsoGumbalo). Shepherd Hope can be interpreted as a strong desire, inclination and encouragement towards something that wants to be realized to make someone better in the future. The expression of copyrighted ideas departs from the phenomenon of AsoGumbalo, which the creator expressed with a symbolic expression into the creation of painting. This method of creating works through several stages, namely; 1) The exploration phase is the stage of searching for ideas by conducting emic and ethical research for the production of works, 2) the design phase that is the prototype-making stage which will be realized in the form of painting, 3) the process stage of the work done. The concept of creation of works is a symbolic expression by utilizing traditional idioms, these expressions are depicted in the realization of the work using media strategies and visual strategies by using the concept of form processing, namely deformation and transformation by combining several techniques, such as plaque, transparent, pseudo-texture and real texture. AsoGumbalo as an inspiration expressed in the form of paintings of symbolic expression. works created by artists are presented in the form of exhibitions.  Keywords:asogumbalo, symbolic expression, painting.  

Atomistic Study of Cleavage and Dislocation Emission in NiAl

1994 ◽  
Vol 364 ◽  
Author(s):  
M. Ludwig ◽  
P. Gumbsch
Keyword(s):  
Finite Element ◽  
Mixed Mode ◽  
Crack Tip ◽  
Mode I ◽  
Crack Plane ◽  
Dislocation Emission ◽  
Dislocation Generation ◽  
Embedded Atom ◽  
Atomistic Study ◽  
Eam Potential

AbstractThe atomistic processes during fracture of NiAl are studied using a new embedded atom (EAM) potential to describe the region near the crack tip. To provide the atomistically modeled crack tip region with realistic boundary conditions, a coupled finite element - atomistic (FEAt) technique [1] is employed. In agreement with experimental observations, perfectly brittle cleavage is observed for the (110) crack plane. In contrast, cracks on the (100) plane either follow a zig-zag path on (110) planes, or emit dislocations. Dislocation generation is studied in more detail under mixed mode I/II loading conditions.

Une idée monstrueuse: Bicameralism in the Early French Revolution

1969 ◽  
Author(s):  
Sean Marrs
Keyword(s):  
French Revolution ◽  
The Political ◽  
National Assembly ◽  
Political Group ◽  
The Commons ◽  
Assembly Floor ◽  
The Creation ◽  
Work Done ◽  
Constitutional Issue ◽  
The Revolution

In the spring of 1789, the members of the newly formed National Assembly tasked itself with the creation of France’s first Constitution. The Assembly set out to reform their country by incorporating enlightenment ideas and newfound liberties. Creating the constitution was not an easy process and the Assembly floor was home to many fierce debates, divides, and distrust amongst the Three Orders: the Clergy, the Nobility, and the Commons.  One Constitutional issue was deciding what form the legislature would take. Mounier, Lally-Tollendal, and Clermont-Tonnerre, members of the Committee of the Constitution, who formed a political group known as the ‘Monarchiens,’ proposed a bicameral system that mirrored the two legislative houses of England. Their political opponents fought instead for a single chambered system. When the vote came to the house, bicameralism was defeated in a landslide.  My research aims at discovering the motivations of the deputies; Why did they reject Mounier’s bicameralism? Much of the work done on this question so far, particularly that of Keith Michael Baker, argues that the deputies were faced with a choice between radically different conceptions of the purpose of the revolution. However, the work of Timothy Tackett points to the smaller, more contingent issues at play. My work involves the analysis of the assembly debates and the political publications being written by the deputies. Similar to Tackett, I conclude that the deputies were immediately motivated less by grand revolutionary narratives, but instead based their vote on a deep distrust of the aristocracy and political factionalism.  

ANALYSIS OF THE CONDITION AND DEVELOPMENT PROBLEMS AND IMPLEMENTATION OF ELECTRONIC SYSTEM ARCHIVES

Infolib ◽  
2020 ◽  
Vol 23 (3) ◽  
pp. 28-32
Author(s):  
Anvar Aliyev ◽  
◽  
◽  
Keyword(s):  
Electronic System ◽  
Foreign Experience ◽  
Legal Documents ◽  
Scientific Approach ◽  
Archival Documents ◽  
The Creation ◽  
Work Done ◽  
Future Plans

This article discusses the main issues of the creation and development of electronic archives aimed at solving the problems of acquisition, accounting, storage and use of archival documents. In this article, the author focuses on the work done during the years of independence in Uzbekistan on the organization of electronic archives, problems and future plans. As a result of his research, the author reflected his scientific approach by studying foreign experience. The important normative and legal documents available for the introduction of electronic archives in Uzbekistan during the years of independence and adopted in this regard for the next year are analyzed. While studying the issue of creating electronic archives, the author took into account the existing material and technical and personnel capabilities of the archives. It is said that the organization of electronic archives creates modern opportunities for the collection, accounting, storage and use of archival documents

Crack-tip dislocation emission arrangements for equilibrium—III. Application to large applied stress intensities

1992 ◽  
Vol 40 (11) ◽  
pp. 2883-2894 ◽  
Author(s):  
P.G. Marsh ◽  
W. Zielinski ◽  
H. Huang ◽  
W.W. Gerberich
Keyword(s):  
Applied Stress ◽  
Crack Tip ◽  
Dislocation Emission

scholarly journals Direct Observation of Dislocation Emission from a Crack Tip in YSZ

Materia Japan ◽  
2005 ◽  
Vol 44 (12) ◽  
pp. 998-998
Author(s):  
Takeo Sasaki ◽  
Satoshi Tanaka ◽  
Takahisa Yamamoto ◽  
Katsuyuki Matsunaga ◽  
Yuichi Ikuhara
Keyword(s):  
Direct Observation ◽  
Crack Tip ◽  
Dislocation Emission

scholarly journals WAGNER - MITO E IMAGINAÇÃO NA ARTE TOTAL

2020 ◽  
Vol 13 (1) ◽  
pp. 101
Author(s):  
Paulo Alexandre Castro
Keyword(s):  
Essential Elements ◽  
Total Work ◽  
Work Of Art ◽  
The Creation

The purpose of this brief essay is to outline what can be considered the combination of two essential elements in the realization of Wagner's works: the strength of the myth's plot and the imaginative process in the creation of the artwork. However, it is not a simple presentation of these elements, but how Wagner, when wishing to create the total work of art, is guided by a phenomenological thought.

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