scholarly journals Stress state of the main girders of the overhead ingot-lifting crane

2021 ◽  
pp. 134
Author(s):  
Alexsandr Rudnev ◽  
Vasiliy Liaturynskyi
Keyword(s):  
Stress State ◽  
Different Types ◽  
Box Beams

The analysis of stresses in the main beams of the bridge well crane is carried out in the work. Different types of load are considered: lifting with a pickup, and also loading on a bar from the side The stresses that occur in these cases are determined experimentally, theoretically, and with the help of software. Investigations of the stress state of box beams of cranes with rigid suspension by different methods indicate the reliability of the methods.

Study of the Residual Stresses Variation into the Sandwich Structure Subjected to Thermomechanical Loading

2018 ◽  
Vol 279 ◽  
pp. 113-118
Author(s):  
Khalid Messaoudi ◽  
Farida Bouafia ◽  
Fethi Benkhenafou ◽  
Lyes Douadji ◽  
Wei Wei Du
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stress State ◽  
Residual Stresses ◽  
Mechanical Loading ◽  
Sandwich Structure ◽  
Thermomechanical Loading ◽  
Metal Interface ◽  
Risk Of Rupture ◽  
Different Types

The assembly of different types of materials like metals and ceramics forms a structure called sandwich structure, which need advanced techniques to joint it together like the thermo compression. However, the rise of residual stress caused by the discontinuity of nature of this type of sandwich material, like incompatibility of the characteristics, which creates a risk of rupture of the structure and limited the using range of these types of materials. In this paper, we study the bonding of ceramic and metal and we will focus on the role played by the ceramic element in the stress state of ceramic/ metal interface and the stresses evaluation by Finite Element when the structure is subjected to thermo-Mechanical loading.

Delamination from edge flaws

1994 ◽  
Vol 447 (1930) ◽  
pp. 271-279 ◽  
Keyword(s):  
Thin Films ◽  
Stress State ◽  
Failure Mechanism ◽  
Crack Front ◽  
Failure Mechanisms ◽  
Different Types ◽  
Laminated Material ◽  
Localized Failure

The mechanics of delamination from an edge flaw in a laminated material is presented. Two different types of failure mechanism have been identified: uniform delamination along the crack front and localized delamination which can be initiated if the laminate buckles above the debonded portion of the interface. Depending on the stress state within the bonded portion of the laminate, this localized failure can initiate the formation of blisters which grow by a mechanism of buckling-driven delamination and can cause general failure of the laminate. There are conditions under which this class of buckling-assisted delamination occurs at loads lower than would be predicted for uniform delamination. It may, therefore, have important implications in the design against failure for thin films, composites and other laminated systems. Experimental observations of the different failure mechanisms are presented and the factors governing the transitions between them are discussed.

scholarly journals Advanced Deformation Stages in Duplex Steel Investigated using Neutron and Synchrotron Radiation

2016 ◽  
Vol 2016 (8) ◽  
pp. 80-91
Author(s):  
E. Gadalińska ◽  
A. Baczmański ◽  
Y. Zhao ◽  
L. Le Joncour ◽  
S. Wroński ◽  
...  
Keyword(s):  
Stress State ◽  
Synchrotron Radiation ◽  
Finite Elements ◽  
Materials Science ◽  
Finite Elements Method ◽  
Experimental Results ◽  
Duplex Steel ◽  
Deformation Stages ◽  
Self Consistent ◽  
Different Types

AbstractThe grain scale of materials is an area still open for investigations within the field of materials science. The most helpful tools to perform this type of research are diffraction methods. Within the research project presented in this paper two experiments were carried out employing two different types of radiation: neutron (ISIS) and synchrotron (ESRF). The aim of the work was to describe the stress state in the necking zone during the occurrence of a damage phenomenon (Fig. 1.) in separate phase and to check the level of the homogeneity. The supplemental tools were the finite elements method and self-consistent modeling – it testified, confirmed and completed our experimental results and allowed us to formulate the justifiable conclusions.

Internal stresses in glulam due to moisture gradients in the grain direction

Holzforschung ◽  
2005 ◽  
Vol 59 (1) ◽  
pp. 18-22 ◽  
Author(s):  
Johan Hans Jönsson
Keyword(s):  
Climate Change ◽  
Experimental Study ◽  
Stress State ◽  
Modulus Of Elasticity ◽  
Internal Stresses ◽  
Test Results ◽  
Tensile Stresses ◽  
Glued Laminated Timber ◽  
Average Maximum ◽  
Different Types

Abstract An experimental study on the internal stress state perpendicular to grain in glued laminated timber induced by moisture variations along the grain is presented. The stress is evaluated by using measured modulus of elasticity and strain. Different types of tests are performed, in which specimens are exposed to artificial climate change when the specimens are in either a wetting or a drying state, and specimens are exposed to a cyclic climate change. Test results from the specimens that were in a drying state show that the tensile stresses near the end of the specimens at some point exceeds the strength of the wood and cracks. In the opposite test, when the specimens are in a moistening phase, the maximum tensile stresses are lower and in the order of 0.2 MPa during the tested period. The cyclic test, which continued during 20 weeks, showed that there were no accumulated effects regarding strain and stress values. In this test, the average maximum tensile and compression stresses were of the order 0.20 and 0.10 MPa, respectively.

scholarly journals Tests for equivalence of the stress state and the generalized stress-strain diagram babbitt Tin-based.

2014 ◽  
Vol 2014 (3) ◽  
pp. 26-34 ◽  
Author(s):  
Михаил Зернин ◽  
Mikhail Zernin
Keyword(s):  
Stress State ◽  
Experimental Investigations ◽  
Stress And Strain ◽  
Strain Diagram ◽  
Stress Strain ◽  
Different Types

Describes the methodologies and results of experimental investigations on the basis of tin babbitt in different types of stress. Specification of parameters of the criterion of equivalence of states of stress and strain diagram obtained single babbitt.

The extinction time of a general birth and death process with catastrophes

1986 ◽  
Vol 23 (04) ◽  
pp. 851-858 ◽  
Author(s):  
P. J. Brockwell
Keyword(s):  
Laplace Transform ◽  
Size Distribution ◽  
Sufficient Conditions ◽  
Necessary And Sufficient Conditions ◽  
Death Process ◽  
Extinction Time ◽  
Birth And Death Process ◽  
Different Types ◽  
The Laplace Transform ◽  
Necessary And Sufficient

The Laplace transform of the extinction time is determined for a general birth and death process with arbitrary catastrophe rate and catastrophe size distribution. It is assumed only that the birth rates satisfyλ0= 0,λj> 0 for eachj> 0, and. Necessary and sufficient conditions for certain extinction of the population are derived. The results are applied to the linear birth and death process (λj=jλ, µj=jμ) with catastrophes of several different types.

Differentiating between different forms of moral obligations

2020 ◽  
Vol 43 ◽  
Author(s):  
Rajen A. Anderson ◽  
Benjamin C. Ruisch ◽  
David A. Pizarro
Keyword(s):  
Moral Character ◽  
Moral Obligations ◽  
Different Types

Abstract We argue that Tomasello's account overlooks important psychological distinctions between how humans judge different types of moral obligations, such as prescriptive obligations (i.e., what one should do) and proscriptive obligations (i.e., what one should not do). Specifically, evaluating these different types of obligations rests on different psychological inputs and has distinct downstream consequences for judgments of moral character.

Ultrastructural Investigations of the Contractile Filaments of Amoebae

1974 ◽  
Vol 32 ◽  
pp. 188-189
Author(s):  
P.L. Moore
Keyword(s):  
Cytoplasmic Streaming ◽  
Three Dimensional ◽  
Freeze Fracture ◽  
Amoeboid Movement ◽  
Different Types ◽  
Chemical Conditions ◽  
Complete Interpretation

Previous freeze fracture results on the intact giant, amoeba Chaos carolinensis indicated the presence of a fibrillar arrangement of filaments within the cytoplasm. A complete interpretation of the three dimensional ultrastructure of these structures, and their possible role in amoeboid movement was not possible, since comparable results could not be obtained with conventional fixation of intact amoebae. Progress in interpreting the freeze fracture images of amoebae required a more thorough understanding of the different types of filaments present in amoebae, and of the ways in which they could be organized while remaining functional.The recent development of a calcium sensitive, demembranated, amoeboid model of Chaos carolinensis has made it possible to achieve a better understanding of such functional arrangements of amoeboid filaments. In these models the motility of demembranated cytoplasm can be controlled in vitro, and the chemical conditions necessary for contractility, and cytoplasmic streaming can be investigated. It is clear from these studies that “fibrils” exist in amoeboid models, and that they are capable of contracting along their length under conditions similar to those which cause contraction in vertebrate muscles.

Study of the Molecular Architecture of Keratin Filaments by Electron Microscopy

1982 ◽  
Vol 40 ◽  
pp. 118-119
Author(s):  
U. Aebi ◽  
P. Rew ◽  
T.-T. Sun
Keyword(s):  
Electron Microscopy ◽  
Structural Organization ◽  
Cell Types ◽  
Structural Features ◽  
Molecular Architecture ◽  
The Past ◽  
Keratin Filaments ◽  
Different Types ◽  
10 Nm Filaments ◽  
Different Cell Types

Various types of intermediate-sized (10-nm) filaments have been found and described in many different cell types during the past few years. Despite the differences in the chemical composition among the different types of filaments, they all yield common structural features: they are usually up to several microns long and have a diameter of 7 to 10 nm; there is evidence that they are made of several 2 to 3.5 nm wide protofilaments which are helically wound around each other; the secondary structure of the polypeptides constituting the filaments is rich in ∞-helix. However a detailed description of their structural organization is lacking to date.

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