Risk Quantified Static Strength Design of Aircraft Structural Components

2007 ◽  
Author(s):  
Ravi Penmetsa ◽  
Eric Tuegel
Keyword(s):  
Static Strength ◽  
Structural Components ◽  
Strength Design

Kinetics Analysis and Simulations on Load Fork Mechanism in Forward-Type Stacker

2010 ◽  
Vol 37-38 ◽  
pp. 608-613
Author(s):  
Jian Yu Bai ◽  
Senlin Tong ◽  
Zai He Yu ◽  
Di Zheng
Keyword(s):  
Static Strength ◽  
Strength Analysis ◽  
Static Force ◽  
Force Analysis ◽  
Kinetics Analysis ◽  
Strength Design ◽  
Simulation Results

It is frequently reported by customers that the lower-left and lower-right wheels in the load fork mechanism of a kind of forward-type stacker designed based on static strength analysis are abraded faster than expected. In this paper, we studied by means of kinetics analysis and simulations the forces applied on parts of the fork mechanism. The simulation results show that the maximum values of instantaneous forces during operations are much higher than those derived based static force analysis, and thus explained the reason of the above-mentioned abnormal abrasion. The results also mean that static force analysis is not suitable for part strength design. Instead, one shall adopt kinetics analysis to explore the instantaneous forces in design.

The Static Strength Reliability Analysis of Composite Aircraft Structures

2014 ◽  
Vol 488-489 ◽  
pp. 1215-1218 ◽  
Author(s):  
Long Xiang Lin ◽  
Hao Lei Mou ◽  
Jian Ren ◽  
Tian Chun Zou
Keyword(s):  
Environmental Factors ◽  
Reliability Analysis ◽  
Composite Structures ◽  
Design Principles ◽  
Static Strength ◽  
Full Scale ◽  
Basic Design ◽  
Aircraft Structure ◽  
Aircraft Structures ◽  
Strength Design

The static strength design of aircraft structure is the most basic design principles. The basic applicable conditions of composite structures static strength reliability analysis using the current methods were mentioned in this paper, and compliance analysis of these basic conditions was carried out. In addition, further studies were also conducted to research the influence of the number of full-scale structural specimens and environmental factors on the composite structures static strength reliability.

Study on the Strength Design of Cold Deformation Strengthening Material

2013 ◽  
Vol 325-326 ◽  
pp. 63-66
Author(s):  
Tie Shan Zhang ◽  
Qun Feng Ma
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Stress State ◽  
Plane Stress ◽  
Material Properties ◽  
Cold Deformation ◽  
Plane Stress State ◽  
Static Strength ◽  
Design Criteria ◽  
Strength Design

Study on Strength design of steel components including residual stress. First, sample with residual stress of shot peening were detected, material properties change with residual stress was analyzed. And problems in the strength design were discussed. On this basis, design criteria for design of static strength and fatigue strength under plane stress state were derivated, the design criteria formula of the unification form is obtained. Finally, examples illustrate the reasonableness of the conclusions and deriving formulas.

Electron probe x-ray microanalysis and electron microscopy of amino acid absorption and transport by the small intestine: inhibition by chemical poisons and correlation to the elemental composition of the epithelial cells

1986 ◽  
Vol 44 ◽  
pp. 134-135
Author(s):  
A. J. Tousimis
Keyword(s):  
Small Intestine ◽  
Amino Acid ◽  
Epithelial Cells ◽  
Elemental Composition ◽  
Isotope Labeling ◽  
Structural Components ◽  
X Ray ◽  
Human Small Intestine ◽  
Transport Studies

The elemental composition of amino acids is similar to that of the major structural components of the epithelial cells of the small intestine and other tissues. Therefore, their subcellular localization and concentration measurements are not possible by x-ray microanalysis. Radioactive isotope labeling: I131-tyrosine, Se75-methionine and S35-methionine have been successfully employed in numerous absorption and transport studies. The latter two have been utilized both in vitro and vivo, with similar results in the hamster and human small intestine. Non-radioactive Selenomethionine, since its absorption/transport behavior is assumed to be the same as that of Se75- methionine and S75-methionine could serve as a compound tracer for this amino acid.

Freeze-fracture cytochemistry: A goal set by Russell Steere in 1957

1993 ◽  
Vol 51 ◽  
pp. 60-61
Author(s):  
Nicholas J Severs
Keyword(s):  
Chemical Nature ◽  
Biological Systems ◽  
Freeze Fracture ◽  
Structural Components ◽  
Major Goal ◽  
Membrane Biology ◽  
Routine Application ◽  
The Future ◽  
Freeze Etching

In his pioneering demonstration of the potential of freeze-etching in biological systems, Russell Steere assessed the future promise and limitations of the technique with remarkable foresight. Item 2 in his list of inherent difficulties as they then stood stated “The chemical nature of the objects seen in the replica cannot be determined”. This defined a major goal for practitioners of freeze-fracture which, for more than a decade, seemed unattainable. It was not until the introduction of the label-fracture-etch technique in the early 1970s that the mould was broken, and not until the following decade that the full scope of modern freeze-fracture cytochemistry took shape. The culmination of these developments in the 1990s now equips the researcher with a set of effective techniques for routine application in cell and membrane biology.Freeze-fracture cytochemical techniques are all designed to provide information on the chemical nature of structural components revealed by freeze-fracture, but differ in how this is achieved, in precisely what type of information is obtained, and in which types of specimen can be studied.

Microtubule motors and other maps

1990 ◽  
Vol 48 (3) ◽  
pp. 1-1
Author(s):  
Richard B. Vallee
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Cytoplasmic Dynein ◽  
Organelle Transport ◽  
Structural Components ◽  
Microtubule Associated Proteins ◽  
Microtubule Motors ◽  
Associated Proteins ◽  
The Subject ◽  
Intracellular Motility

Microtubules are involved in a number of forms of intracellular motility, including mitosis and bidirectional organelle transport. Purified microtubules from brain and other sources contain tubulin and a diversity of microtubule associated proteins (MAPs). Some of the high molecular weight MAPs - MAP 1A, 1B, 2A, and 2B - are long, fibrous molecules that serve as structural components of the cytamatrix. Three MAPs have recently been identified that show microtubule activated ATPase activity and produce force in association with microtubules. These proteins - kinesin, cytoplasmic dynein, and dynamin - are referred to as cytoplasmic motors. The latter two will be the subject of this talk.Cytoplasmic dynein was first identified as one of the high molecular weight brain MAPs, MAP 1C. It was determined to be structurally equivalent to ciliary and flagellar dynein, and to produce force toward the minus ends of microtubules, opposite to kinesin.

Three-Dimensional Reconstruction of Two Forms of the Chaperonin GRO EL

1990 ◽  
Vol 48 (1) ◽  
pp. 258-259
Author(s):  
J.L. Carrascosa ◽  
G. Abella ◽  
S. Marco ◽  
M. Muyal ◽  
J.M. Carazo
Keyword(s):  
Three Dimensional ◽  
The Other ◽  
Two Dimensional ◽  
Series Method ◽  
Three Dimensional Reconstruction ◽  
Structural Components ◽  
E Coli ◽  
Dimensional Reconstruction ◽  
Morphogenetic Factors ◽  
Tilt Series

Chaperonins are a class of proteins characterized by their role as morphogenetic factors. They trantsiently interact with the structural components of certain biological aggregates (viruses, enzymes etc), promoting their correct folding, assembly and, eventually transport. The groEL factor from E. coli is a conspicuous member of the chaperonins, as it promotes the assembly and morphogenesis of bacterial oligomers and/viral structures.We have studied groEL-like factors from two different bacteria:E. coli and B.subtilis. These factors share common morphological features , showing two different views: one is 6-fold, while the other shows 7 morphological units. There is also a correlation between the presence of a dominant 6-fold view and the fact of both bacteria been grown at low temperature (32°C), while the 7-fold is the main view at higher temperatures (42°C). As the two-dimensional projections of groEL were difficult to interprete, we studied their three-dimensional reconstruction by the random conical tilt series method from negatively stained particles.

Sign in / Sign up

Export Citation Format

Share Document