scholarly journals Research of replication accuracy in some elastomer materials with different Young’s modulus

2021 ◽  
Vol 2103 (1) ◽  
pp. 012054
Author(s):  
N N Germash ◽  
N A Esikova ◽  
P K Afonicheva ◽  
A A Evstrapov
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Curing Time ◽  
Master Mold ◽  
Curing Conditions ◽  
Elastomeric Materials ◽  
Replication Accuracy ◽  
Better Than ◽  
Different Young’S Modulus

Abstract In this work we observed three different elastomeric materials with different Young’s modulus: Silastic T-4, Plat Set 30, and Lasil-C. Their usage makes it possible to overlap the range of rigidity obtained for Silgard under different curing conditions, without high temperatures and long curing time. The results obtained during the replicas formation using a brass master mold with micro-sized structures for these elastomers were presented. The quality of the replication in materials with low Young’s modulus turned out to be better than for Silgard, and for the hard Silastic T-4 – it is comparable to it.

scholarly journals Correlation between Young’s modulus and impregnation quality of epoxy-impregnated SWCNT buckypaper

2010 ◽  
Vol 41 (9) ◽  
pp. 1184-1191 ◽  
Author(s):  
Behnam Ashrafi ◽  
Jingwen Guan ◽  
Vahid Mirjalili ◽  
Pascal Hubert ◽  
Benoit Simard ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus

scholarly journals Composite Films of Thermoplastic Starch and CaCl2 Extracted from Eggshells for Extending Food Shelf-Life

2021 ◽  
Vol 2 (3) ◽  
pp. 677-690
Author(s):  
Jeovan A. Araujo ◽  
Yvonne J. Cortese ◽  
Marija Mojicevic ◽  
Margaret Brennan Fournet ◽  
Yuanyuan Chen
Keyword(s):  
Antimicrobial Activity ◽  
Young’S Modulus ◽  
Calcium Chloride ◽  
Young's Modulus ◽  
Fungal Growth ◽  
Thermoplastic Starch ◽  
Packaging Material ◽  
Apple Slices ◽  
Fresh Cut

Calcium chloride (CaCl2) has been widely used to maintain the quality of fresh-cut fruits and vegetables because it stabilizes and strengthens the membrane system against fungal attacks. It is mainly applied via spray coating and dip coating techniques. This study explored a method of incorporating calcium chloride extracted from eggshells in a packaging material, thermoplastic starch (TPS), via a hot-melt extrusion process. The composites were characterized by FTIR, DSC, SEM-EDX and tensile testing. FTIR confirmed the chemical reactions between CaCl2 and TPS. DSC results showed a significant decrease in the heat of fusion by adding 20 wt% of CaCl2 content in TPS, indicating a drop in the degree of crystallinity. The Young’s modulus of TPS was not significantly affected by the incorporation of 10 wt% CaCl2 (P = 0.968), but reduced notably with the addition of 20 wt% CaCl2 (P = 0.05), indicating the plasticizer effect of the CaCl2. Physiochemical analysis of fresh-cut apple slices was assessed. Samples placed on the surface of the TPS/CaCl2 composites displayed less pH reduction, reduced antioxidant activity, more weight loss and increased reducing sugar compared to the samples placed on the surface of virgin TPS films. CaCl2 released from the TPS/CaCl2 films was measured and their antimicrobial activity was confirmed by bacterial inhibitory growth assessment. Fungal growth was observed on apple slices placed on virgin TPS film by day 21 while apple slices placed on TPS/CaCl2 20 wt% composites did not support any fungal growth for 28 days. In summary, TPS and eggshell-extracted CaCl2 showed the ability to maintain the quality of fresh-cut apples, and TPS/CaCl2 10 wt% composite could be a good option as a packaging material for fresh-cut fruits due to active antimicrobial activity and maintained Young’s modulus.

A note on the elastic stress in tunnel linings

1966 ◽  
Vol 1 (2) ◽  
pp. 110-114
Author(s):  
D. W. Jordan
Keyword(s):  
Tensile Stress ◽  
Young’S Modulus ◽  
Circumferential Strain ◽  
Elastic Stress ◽  
Young's Modulus ◽  
Surrounding Rock ◽  
Tunnel Lining ◽  
Circular Tunnel ◽  
Qualitative Discussion ◽  
Different Young’S Modulus

A circular tunnel lining is idealized as a perfectly elastic annulus either keyed to, or a sliding fit in a hole in an infinite elastic medium of different Young's modulus, the system being under stress at infinity. The solution to this problem is used to give a qualitative discussion of two situations: 1 The resistance of a tunnel lining is limited amongst other things by its inability to withstand tensile stress. It is shown that in the above idealization, the more flexible the lining the less likely are tensions to arise. Such flexibility might be achieved by allowing the lining freedom to slide relative to the surrounding rock rather than by keying it to the walls, by making it of laminated construction or by lowering its Young's modulus. Increasing the thickness may increase the liability to tension. 2 As a means of estimating the load on a lining, gauges may be placed to measure circumferential strain, and from these measurements the load is deduced by assuming that the lining behaves like a bending beam. A difficulty in interpreting such measurements is pointed out in the case of a keyed lining, when the shearing stresses are very large.

The development of fatigue quality in high- and low-stressed tendons of sheep (Ovis aries)

2000 ◽  
Vol 203 (14) ◽  
pp. 2187-2193 ◽  
Author(s):  
A.V. Pike ◽  
R.F. Ker ◽  
R.M. Alexander
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Cyclic Fatigue ◽  
Fatigue Tests ◽  
Ovis Aries ◽  
Loading History ◽  
Cross Sectional ◽  
Extensor Tendons ◽  
Over Time

The time taken to rupture in cyclic fatigue tests, to a stress of 45 MPa, was used to compare the fatigue quality of tendons from sheep of varying ages. Muscle and tendon cross-sectional areas were used to calculate the stress-in-life of each tendon. For any given age, high-stressed plantaris tendons were of a higher fatigue quality than low-stressed extensor tendons. Both fatigue quality and stress-in-life increased with age for each tendon type. High-stressed tendons are subjected to large increases in stress-in-life during growth, and fatigue quality increased significantly with this stress. This relationship was not seen, however, in low-stressed tendons, which are not subjected to a comparable range of stresses over time. It is possible that cells modify tendon fatigue quality in response to tendon loading history. Whilst Young's modulus was seen to increase with age, no difference was detected between high- and low-stressed tendons.

Study on the Electrometric Method to Measure the Young’s Modulus of Metal Materials

2013 ◽  
Vol 652-654 ◽  
pp. 1319-1334
Author(s):  
Li Feng Xiao ◽  
Ran Duan ◽  
Xin Guang Chen
Keyword(s):  
Young’S Modulus ◽  
Strain Gauge ◽  
Young's Modulus ◽  
Key Factors ◽  
Electrometric Method ◽  
Measurement Results ◽  
Engineering Significance ◽  
Properties Of Materials ◽  
Metal Materials

Young's modulus is one of the basic mechanical properties of materials, so its accurate measurement has great engineering significance. Electrometric method is one of the commonly used method. Proceeding from experimental techniques, this paper studies the key factors which affect the result of the experimental measurement, including the influence of the uneven load, the pre-stretching, the hardening time of the strain gauge binder, and sticking quality of strain gauge; comprehensively provides the experimental measures to improve the measurement accuracy. Then through the uncertainty evaluations of the results with different measures, this paper from a point of quantitative view proves that taking these measures can reduce the dispersion of the measurement results and significantly improve the accuracy of experimental results.

Relationship between the Ratio of Young’s Modulus to Hardness and the Elastic Recovery of Nanoindentation

2011 ◽  
Vol 492 ◽  
pp. 5-8
Author(s):  
Zhi Jian Peng ◽  
Tao Wen ◽  
Jiang Hong Gong ◽  
Cheng Biao Wang ◽  
Zhi Qiang Fu ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Power Law ◽  
Material Parameter ◽  
Young's Modulus ◽  
Elastic Recovery ◽  
Polynomial Representation ◽  
Better Than

Through the analysis of the nanoindentation data obtained on metals, ceramics and glass, it has been confirmed that the elastic recovery during unloading cycle may be related with the material parameter H/E, and a polynomial representation which is better than the power law for the description of the unloading behavior of nanoindentation was proposed in this letter.

Property Modification of 3C-SiC MEMS on Ge-Modified Si(100) Substrates

2010 ◽  
Vol 645-648 ◽  
pp. 861-864 ◽  
Author(s):  
Florentina Niebelschütz ◽  
Wei Hong Zhao ◽  
Klemens Brueckner ◽  
Katja Tonisch ◽  
Matthias Linß ◽  
...  
Keyword(s):  
Residual Stress ◽  
Young’S Modulus ◽  
Microelectromechanical Systems ◽  
Young's Modulus ◽  
Growth Conditions ◽  
Quality Factors ◽  
Growth Changes ◽  
Property Modification ◽  
Good Agreement

The manipulation of nucleation and growth conditions with Ge deposition prior to the carbonization and epitaxial growth changes the residual stress and the material quality of 3C-SiC(100)-layers grown on Si(100). This enables the modification of quality factor and resonant frequency of microelectromechanical systems (MEMS) based on 3C-SiC-layers. Measured resonant frequencies and quality factors of the magnetomotively actuated MEMS exhibit a dependence on the Ge amount at the interface of the Si/SiC heterostructure. This offers a degree of freedom to adjust the MEMS properties within a certain range to the requirements necessary for specific applications. The observed dependencies of the Young’s modulus are in good agreement with the trends of residual stress and Young’s modulus, which were determined on as grown 3C-SiC(100):Ge samples by fourier transform infrared (FTIR) spectroscopy and nanoindentation.

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