scholarly journals Study on Qualification for Cold Mass Support of ITER FEEDER CFT

2020 ◽  
Author(s):  
Xiaoshi Tang ◽  
Chen Liu ◽  
Kun Lu ◽  
Fuxing Chen ◽  
Xiaojun Ni ◽  
...  
Keyword(s):  
Load Transfer ◽  
Mechanical Load ◽  
Mechanical Test ◽  
Thermal Conductance ◽  
Functional Requirements ◽  
Maximum Deformation ◽  
Dlc Coating ◽  
Shear Loads ◽  
Internal Component ◽  
Cold Mass

Abstract Cold Mass Support (CMS) is a very important internal component of ITER Cryostat feedthrough (CFT), which acts as structure support who bears shear loads and sliding, as well as where heat load transfer from room temperature to 4.2K component. Base on the special functional requirements and importance, the design of CMS should be qualified before the real production used on ITER Feeder system. In this paper, the qualification process of CMS was studied, three kinds of qualification tests were done on CMS mockup and prototype, include structural mechanical strength test, sliding pad qualification tests, and thermal conductance test. Every testing process was introduced in detail, such as the load distribution of mechanical test, the setup of test platform, special test equipment and methods, etc. Some important performance parameters were obtained, such as the maximum deformation under mechanical load, the friction coefficient and some key performances of the Diamond-Like Carbon (DLC) coating, temperature gradient of CMS during cryogenic test, and so on. All these testing results could prove that the design of the CMS was satisfactory, and the qualification was successful.

Fatigue of Notched CMC Plates Under Variable Thermomechanical Loads

2000 ◽  
Author(s):  
Arvind Nagar ◽  
Ming Xie
Keyword(s):  
Load Transfer ◽  
Mechanical Load ◽  
Empirical Relation ◽  
Ceramic Matrix Composite ◽  
Peak Stress ◽  
Load Cycle ◽  
Fatigue Tests ◽  
Laminated Plates ◽  
Open Hole ◽  
Stress Ratios

Abstract The work is a part of a major study to develop design analysis methods for strength and life of CMC structural joints. This paper describes results of thermomechanical fatigue tests conducted on open hole ceramic matrix composite laminated plates. The open hole represent the zero load transfer in a joint. The thermomechanical spectrum loads included mechanical load cycle blocks of various stress levels and stress ratios. The thermal loads were varied simultaneously with mechanical loads for the duration of a representative generic flight. The spectrum peak stress versus life data was developed for the case when the peak temperature is 1500 F. An empirical relation to describe the fatigue life is presented. The results show that a CMC laminate with an open hole spend most of the life during initiation.

scholarly journals Cortical bone development under the growth plate is regulated by mechanical load transfer

2006 ◽  
Vol 208 (1) ◽  
pp. 73-79 ◽  
Author(s):  
E. Tanck ◽  
G. Hannink ◽  
R. Ruimerman ◽  
P. Buma ◽  
E. H. Burger ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Growth Plate ◽  
Load Transfer ◽  
Mechanical Load ◽  
Bone Development

Collagen Fiber Re-Alignment and Mechanical Properties in a Mouse Supraspinatus Tendon Model: Examining Changes With Age and Location

2012 ◽  
Author(s):  
Kristin S. Miller ◽  
Brianne K. Connizzo ◽  
Elizabeth Feeney ◽  
Louis J. Soslowsky
Keyword(s):  
Mechanical Properties ◽  
Collagen Fiber ◽  
Mechanical Load ◽  
Mechanical Test ◽  
Insertion Site ◽  
Supraspinatus Tendon ◽  
Tissue Response ◽  
Mechanical Stimuli ◽  
Fiber Alignment ◽  
Collagen Fiber Alignment

One postulated mechanism of tendon structural response to mechanical load is collagen fiber re-alignment. Recently, where collagen fiber re-alignment occurs during a tensile mechanical test has been shown to vary by tendon age and location in a postnatal developmental mouse supraspinatus tendon (SST) model [1]. It is thought that as the tendon matures and its collagen fibril network, collagen cross-links and collagen-matrix interactions develop, its ability to respond quickly to mechanical stimuli hastens [1]. Additionally, the insertion site and midsubstance of postnatal SST may develop differently and at different rates, providing a potential explanation for differences in fiber re-alignment behaviors at the insertion site and midsubstance at postnatal developmental time points [1]. However, collagen fiber re-alignment behavior, in response to mechanical load at a mature age and in comparison to developmental ages, have not been examined. Therefore, the objectives of this study are to locally measure: 1) fiber re-alignment during preconditioning and tensile mechanical testing and 2) to compare local differences in collagen fiber alignment and corresponding mechanical properties to address tissue response to mechanical load in the mature and postnatal developmental mouse SST. We hypothesize that 1) 90 day tendons will demonstrate the largest shift in fiber re-alignment during preconditioning, but will also re-align during the toe- and linear-regions. Additionally, we hypothesize that 2) mechanical properties and initial collagen fiber alignment will be greater in the midsubstance of the tendon compared to the tendon-to-bone insertion site at 90 days, 3) that mechanical properties will increase with age, and that 4) collagen fiber organization at the insertion site will decrease with age.

Electro-mechanical load transfer from a fiber in a 1–3 piezocomposite with an imperfect interface

2008 ◽  
Vol 39 (7-8) ◽  
pp. 1114-1124 ◽  
Author(s):  
Y. Sapsathiarn ◽  
T. Senjuntichai ◽  
R.K.N.D. Rajapakse
Keyword(s):  
Load Transfer ◽  
Mechanical Load ◽  
Imperfect Interface

Adaptive High Precision Temperature Control of a Thermo-Mechanical Test Bench for Turbine Blades

2005 ◽  
Author(s):  
Michael Naderhirn ◽  
Luigi del Re
Keyword(s):  
Control Method ◽  
Mechanical Load ◽  
Mechanical Test ◽  
Technological Development ◽  
Turbine Blades ◽  
Essential Element ◽  
Large Temperature ◽  
Precision Temperature ◽  
High Control ◽  
Very High

Material testing is an essential element in the technological development of airplane turbines. The blades are subject to very high stresses, both thermal and mechanical. To assess material suitability, thermo-mechanical test benches are used where a typical thermo-mechanical load is applied to the test rigs. The sensitivity of the fatigue assessment is very high which requires a very high control precision over a large temperature range and a fast adaptation to different setups. This paper discusses two approaches where the first is a self tuning inverse control loop. The second approach is a data based control method where identification routines are used to dynamically compute the approximated system inverse and use this information to automatically tune the control system for saw-tooth profiles. It is shown that a simple two-zone thermal model describes the behavior of the probe and is then used to derive the inverse model and a control strategy. Finally experimental results of a typical test cycle are presented.

scholarly journals Characterization of the content and distribution of collagen and proteoglycan in the decellularized book-shaped enthesis scaffolds by SR-FTIR

2021 ◽  
Author(s):  
Qiang Shi ◽  
Can Chen ◽  
Muzhi Li ◽  
Yang Chen ◽  
Yan Xu ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Rotator Cuff ◽  
Load Transfer ◽  
Mechanical Test ◽  
Three Dimensional ◽  
Decellularized Extracellular Matrix ◽  
Quantitative Mapping ◽  
Extracellular Matrix Molecules ◽  
Histological Morphology

Abstract Background: Bone-tendon interface (enthesis) plays a pivotal role in relaxing load transfer between otherwise structurally and functionally distinct tissue types. Currently, decellularized extracellular matrix (DEM) from enthesis provide a natural three-dimensional scaffold with tissue-specific orientations of extracellular matrix molecules for enthesis regeneration, however, the content and distribution of collagen and proteoglycan in the decellularized book-shaped enthesis scaffolds from rabbit rotator cuff by SR-FTIR have not been reported.Methods: Native enthesis tissues (NET) harvested from rabbit rotator cuff were sectioned into cuboid (about 30 mm × 1.2 mm × 10 mm) for decalcified. The decellularized book-shaped enthesis scaffolds were conducted and intrinsic ultrastructure was evaluated by histological staining and scanning electron microscopy (SEM), respectively. The content and distribution of collagen and proteoglycan in the decellularized book-shaped enthesis scaffolds from rabbit rotator cuff were also measured innovatively by SR-FTIR.Results: The decellularized book-shaped enthesis scaffolds from rabbit rotator cuff were successfully obtaine©d. Histomorphology and SEM evaluated the decellularized effect and the structure of extracellular matrix during decellularization. After mechanical test, we found the failure load in the NET group was higher than that in the DEM group (P < 0.05), reached 1.32 times as much as that in the DEM group. Meanwhile, the stiffness of the DEM group was significantly lower than the NET group. Furthermore, the distributions of collagen and PGs content in the decellularized book-shaped enthesis scaffolds were decreased obviously after decellularization by SR-FTIR quantitative analysis.Conclusion: SR-FTIR was applied innovatively to characterize the histological morphology of native enthesis tissues from rabbit rotator cuff. Moreover, it can be used for quantitative mapping of the content and distribution of collagen and PGs content in the decellularized book-shaped enthesis scaffolds.

scholarly journals “Effect of floating columns on buildings subjected to seismic forces”

2021 ◽  
Vol 1197 (1) ◽  
pp. 012018
Author(s):  
Neha Pawar ◽  
Kuldeep Dabhekar ◽  
Prakash Patil ◽  
Isha Khedikar ◽  
Santosh Jaju
Keyword(s):  
Load Transfer ◽  
Response Spectrum ◽  
Research Work ◽  
Functional Requirements ◽  
Base Shear ◽  
Response Spectrum Analysis ◽  
Earthquake Excitation ◽  
Transfer Path ◽  
Recent Trends ◽  
Seismic Forces

Abstract In Recent Trends, buildings are planned to fulfill their architectural and functional requirements but sometimes this creates complexity in its structural strength. One such element is the floating column. It is used to boost Floor Space Index. The Earthquake forces developed at different storey need to be carried down by the shortest path. Discontinuity in the load transfer path leads to poor seismic performance of the structure. Hence as per IS: CODE-1893:2016 clause no-7.1, the Construction of Floating Column is restricted. But there is no limit to research work. The purpose of this research is to analyze the structural irregularity occurring due to floating columns and also to find out the optimized solution to decrease the risk due to earthquake excitation. For Simplicity, the focus of this study is limited to symmetrical G+8 Structure. Finite element Based ETabs software has been used for the analysis. Response spectrum analysis was done in the software. Total ten models are considered with different conditions and their results were compared in terms of Storey displacement, Storey drifts, Base Shear and Overturning moments. All results are compared with the conventional building.

EXPERIMENTAL INVESTIGATION OF THE EFFECT OF MECHANICAL LOADING ON THERMAL TRANSPORT IN CERAMIC MATRIX COMPOSITES

2009 ◽  
Vol 01 (03n04) ◽  
pp. 403-431 ◽  
Author(s):  
MOHAMMED A. SHEIKH ◽  
DAVID R. HAYHURST ◽  
SARAH C. TAYLOR ◽  
ROY TAYLOR
Keyword(s):  
Thermal Diffusivity ◽  
Mechanical Loading ◽  
Mechanical Load ◽  
Mechanical Test ◽  
Axial Strain ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Laser Flash ◽  
Test Machine

This paper presents the results of experimental measurements of transverse thermal diffusivity for six different industrial Ceramic Matrix Composite materials under the action of in-plane uni-axial mechanical loading. Measurements have also been taken using a one-dimensional Laser Flash technique on 8 mm diameter disc specimens without mechanical load. These results have been used to benchmark data obtained using a three-dimensional Laser Flash rig developed to operate on large mechanical test specimens whilst being loaded in a test machine. The latter facility has been used to measure the degradation of transverse thermal diffusivity with uni-axial strain. For five of the composites tested the degradation of transverse thermal diffusivity was small; and the degradation of transverse thermal diffusivity was linear with strain. One composite showed evidence of fibre pullout, and a decrease of transverse thermal diffusivity to a low value. The different behaviours observed were believed to be associated with the weave type/composite lay-up, and the selection of composite constituent materials, although insufficient data is available to make general conclusions.

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