Mid-Explosion Recovery of an Intermediate Phase of a Cylindrical Metal Shell

2018 ◽  
Keyword(s):  
Intermediate Phase ◽  
Metal Shell ◽  
Cylindrical Metal

Mid-Explosion Recovery of an Intermediate Phase of a Cylindrical Metal Shell

2018 ◽  
Vol 54 (2) ◽  
pp. 246-254 ◽  
Author(s):  
J.-J. Zhu ◽  
W.-B. Li ◽  
X.-M. Wang ◽  
W.-B. Li ◽  
Y. Zheng
Keyword(s):  
Intermediate Phase ◽  
Metal Shell ◽  
Cylindrical Metal

Software-based approach to the analysis of displacements in contact-constrained shell structures

2020 ◽  
Author(s):  
A.V. Egorov
Keyword(s):  
Layer Structure ◽  
Local Area ◽  
Physical Nonlinearity ◽  
Shell Structures ◽  
Design Stage ◽  
Metal Composite ◽  
Metal Shell ◽  
Dynamic Formulation ◽  
Cylindrical Metal ◽  
Computation Scheme

In transversely separable shell structures, a thin metal shell is surrounded by a rigid medium. The proposed approach to solving delamination problems in such constructions is based on three points: the introduction of technological deviations (corresponding to permissible defects in actual structures) to the computation scheme of the structure; the determination of the volumetric general stress-strain state of the structure; real-time structure deformation accounting. The approach is implemented in the LS-DYNA software package in a dynamic formulation using finite elements TSHELL and SOLID, taking into account the geometric and physical nonlinearity of the structure and the shell — medium contact surface with unilateral constraint along normal line, without tangent interactions. According to the proposed approach, the result of calculations is the assessment of the loads on the initial two-layer structure, under which a metal shell with low bending stiffness can lose stability in the local area in the form of internal wrinkles. An example of the calculation of a cylindrical metal-composite high-pressure vessel under loading by a cooled external composite shell is given. The time intervals of the onset of delamination and growth of wrinkles on the surface of the inner metal shell (liner) are established. The solutions are presented in the form of images of the deformed surface of the liner and graphs of time-dependent changes in stresses, strains and displacements; their correspondences to each other are shown. The proposed approach allows one by visual demonstration and accurately to assess the possibility of delamination in contact-constrained shell structures already at the design stage.

Application of ring beam stiffness criterion for discretely supported shells under global shear and bending

2018 ◽  
Vol 21 (16) ◽  
pp. 2404-2415
Author(s):  
Cem Topkaya ◽  
Özer Zeybek
Keyword(s):  
Cylindrical Shell ◽  
Loading Condition ◽  
Finite Element Analyses ◽  
Shell Wall ◽  
Metal Shell ◽  
Design Standards ◽  
Compressive Stresses ◽  
Cylindrical Metal ◽  
Axial Compressive Stress ◽  
Stiffness Criterion

Silos in the form of a cylindrical metal shell are commonly elevated to provide access to the space beneath. In general, a few discrete column supports at evenly spaced intervals are commonly utilized. The presence of discrete supports results in circumferential non-uniformity in the axial compressive stress above the support. Depending on the size of the structure, several different support arrangements may be chosen. A stiff ring beam is utilized in larger silos to transfer and evenly distribute the discrete forces from the supports into the cylindrical shell wall. A stiffness criterion was developed by Rotter to assess the degree of non-uniformity in axial compressive stresses around the circumference. The stiffness criterion is based on the relative stiffnesses of the ring beam and the cylindrical shell and was verified for loading conditions that produce circumferentially uniform axial stresses around the circumference. A study has been undertaken to investigate the applicability of the stiffness criterion to cylindrical shells under global shear and bending. Pursuant to this goal, extensive finite element analyses were conducted where different ring beam and cylindrical shell combinations are subjected to global shearing and bending actions. The results revealed that the stiffness criterion can be extended to shells under this loading condition. The degree of non-uniformity in axial stresses is quantified and presented as simple formulas that can be readily adopted by design standards.

Patient satisfaction and comfort after a full-arch immediate loaded prosthesis

2020 ◽  
Author(s):  
Elena Dellepiane ◽  
Francesco Pera ◽  
Paola Zunino ◽  
Maria Grazia Mugno ◽  
Paolo Pesce ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Oral Health ◽  
Intermediate Phase ◽  
Critical Issue ◽  
Health Impact ◽  
Immediate Loading ◽  
Oral Rehabilitation ◽  
Masticatory Ability ◽  
Chewing Ability

The aim of this study was to assess oral health related quality of life (OHRQoL) of patients before, during and after completion of implant-supported full-arch immediate loading rehabilitation according to the Columbus Bridge Protocol (CBP). 25 patients with compromised dentition were rehabilitated according to the CBP and were assessed for OHRQoL using 4 questionnaires specifically realized for this study and inspired to the OHIP (Oral Health Impact Profile) questionnaire. Patients assessed themselves before surgery, during the healing period (1 week and 2 months after surgery) and after definitive prosthodontic treatment (4 months after surgery). The questionnaires specifically investigated patients’ pain, confort, home oral hygiene habits, satisfaction related to esthetics, masticatory ability, phonetics and general satisfaction toward the treatment.Patients reported an improvement of OHRQoL after full-arch immediate loading rehabilitation. A statistically significant improvement in aesthetic and chewing ability was found. After 4 months 92% of the patients did not feel tense with their smile, 96% did not show problems to relate with other people or smiling, 92% did not show difficulty to eat some foods. Phonetics was found to be a critical issue, especially in the intermediate phase of healing. One week after surgery the percentage of patients who was very satisfied with phonetics slightly decreased from 48% to 36%. The assessment of patients' OHRQoL related to full-arch immediate loading implant therapy exhibited a significant improvement of their quality of life. The questionnaires herein presented could be an effective tool to evaluate patients' reaction to oral rehabilitation.

PHASE EQUILIBRIUM IN THE AS2TE3-TM2TE3 SYSTEM.

2020 ◽  
Vol 5 (8(77)) ◽  
pp. 65-68
Author(s):  
Teymur Mammad Ilyasly ◽  
Rahman Hasanaga Fatullazade ◽  
Zakir Islam Ismailov ◽  
Nigar Nadir Jafarova
Keyword(s):  
Thermal Analysis ◽  
Solid Solution ◽  
Differential Thermal Analysis ◽  
Phase Equilibrium ◽  
Physicochemical Properties ◽  
Thermal Effects ◽  
Isothermal Annealing ◽  
Intermediate Phase ◽  
Physicochemical Analysis ◽  
Two Phases

The synthesis of alloys of the system was carried out stepwise in rotary furnaces. The synthesis mode was selected based on the physicochemical properties of the elementary components. For homogenization, the alloys were subjected to isothermal annealing at 750 and 1275 K, depending on the Tm2Te3 concentration, for 250 h after homogenization of the alloys, they were subjected to physicochemical analysis. The results of differential thermal analysis showed that reversible thermal effects are observed in the alloys of the system. In alloys in a 1: 1 ratio, a new intermediate phase is formed with a composition corresponding to the TmAsTe3 compound. The homogeneity area is observed in the concentration range 52.5-47.5. It was found that in the concentration range 98.5-52.5 Tm2Te3 there are two phases - a mixture of β and of the solid solution, and in the concentration range of 47.51 mol% Tm2Te3 phases and α are in equilibrium. ) 66 The eutectic has coordinates of 11.5 mol Tm2Te3 at a temperature of 575 K.

Public Evaluation of Municipal Water Reuse Alternatives

1992 ◽  
Vol 26 (7-8) ◽  
pp. 1537-1543 ◽  
Author(s):  
W. H. Bruvold
Keyword(s):  
Water Reuse ◽  
Environmental Planning ◽  
Public Involvement ◽  
Intermediate Phase ◽  
Population Surveys ◽  
Short List ◽  
Municipal Water ◽  
Public Evaluation ◽  
Technical Planning ◽  
The One

Models recommended for public involvement in environmental planning call for: 1) early and full involvement with technical planners from the start, 2) involvement at an intermediate phase once technical planners have developed a short list of the most feasible alternatives, and 3) later involvement only by ratification of the one alternative selected and developed by technical planners. The present study reports results assessing public involvement in planning at the intermediate phase using results from three general population surveys of the greater San Diego area done in 1989, 1990, and 1991 which dealt with municipal water reuse alternatives. Feasibility of the intermediate approach was demonstrated by correspondence between survey and technical planning evaluations and by consistency between and within survey findings.

Assessment of the intermediate phase in milk fat by low-resolution nuclear magnetic resonance

1995 ◽  
Vol 311 (2) ◽  
pp. 217-223 ◽  
Author(s):  
D. Le Botlan ◽  
I. Helie-Fourel
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Milk Fat ◽  
Intermediate Phase ◽  
Low Resolution ◽  
Nuclear Magnetic

scholarly journals Component Modification of Basic Oxygen Furnace Slag with C4AF as Target Mineral and Application

2021 ◽  
Vol 13 (12) ◽  
pp. 6536
Author(s):  
Yanrong Zhao ◽  
Pengliang Sun ◽  
Ping Chen ◽  
Xiaomin Guan ◽  
Yuanhao Wang ◽  
...  
Keyword(s):  
Intermediate Phase ◽  
Raw Materials ◽  
Activity Index ◽  
Basic Oxygen Furnace ◽  
Hydration Products ◽  
Basic Oxygen ◽  
Bof Slag ◽  
Mineral Compositions ◽  
Slag Component ◽  
Basic Oxygen Furnace Slag

In this paper, a new method of basic oxygen furnace (BOF) slag component modification with a regulator was studied. The main mineral was designed as C4AF, C2S and C3S in modified BOF slag, and the batching method, mineral compositions, hydration rate, activation index and capability of resisting sulfate corrode also were studied. XRD, BEI and EDS were used to characterize the mineral formation, and SEM was used to study the morphology of hydration products. The results show that most inert phase in BOF slag can be converted into active minerals of C4AF and C2S through reasonable batching calculation and the amount of regulating agent. The formation of C4AF and C2S in modified BOF slag is better, and a small amount of MgO is embedded in the white intermediate phase, but C3S is not detected. With the increase in the CaO/SiO2 ratio in raw materials, the CaO/SiO2 ratio of calcium silicate minerals in modified BOF slag increases, the contents of f-CaO are less than 1.0%, and the activity index improves. Compared with the BOF slag, the activity index and exothermic rate of modified BOF slag improved obviously, and the activity index of 90 days is close to 100%. With the increase in modified BOF slag B cement, the flexural strength decrease; however, the capability of resisting sulfate corrode is improved due to the constant formation of a short rod-like shape ettringite in Na2SO4 solution and the improvement of the structure densification of the hydration products.

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