Performance of Strain Gauge in Strain Measurement and Brittle Coating Technique

2020 ◽  
pp. 78-90
Author(s):  
Balaji P. S. ◽  
Karthik Selva Kumar Karuppasamy ◽  
Bhargav K. V. J. ◽  
Srajan Dalela
Keyword(s):  
Strain Gauge ◽  
Strain Measurement ◽  
Temperature Effects ◽  
The Other ◽  
Strain Selection ◽  
Optical Methods ◽  
Brittle Coating ◽  
Coating Technique ◽  
Metallic Foil ◽  
Full Benefit

The strain gauge system consists of a metallic foil supported in a carrier and bonded to the specimen by a suitable adhesive. Previous chapters discussed the construction, configuration, and the material of the strain gauge. The strain gauge has advantages over the other methods. A strain gauge can give directly the strain value as output. However, in optical methods, it is required to interpret the results. It is also required to be aware that the strain gauge technology is majorly used, and it can also be easily wrongly used. Hence, it is required to obtain the proper knowledge of the strain gauge to get the full benefit of the technology. This chapter covers the majorly on the performance of the strain gauge, its temperature effects, and strain selection. Further, this chapter also covers the brittle coating technique that is used to decide the position of the strain gauge in the applications.

Temperature Effects during Endodormancy Induction on Subsequent Anthesis and Growth of Peach Trees

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 452c-452 ◽  
Author(s):  
Schuyler D. Seeley ◽  
Raymundo Rojas-Martinez ◽  
James Frisby
Keyword(s):  
Temperature Effects ◽  
Shoot Length ◽  
The Other ◽  
Nighttime Temperatures ◽  
Peach Trees ◽  
Better Than

Mature peach trees in pots were treated with nighttime temperatures of –3, 6, 12, and 18 °C for 16 h and a daytime temperature of 20 °C for 8 h until the leaves abscised in the colder treatments. The trees were then chilled at 6 °C for 40 to 70 days. Trees were removed from chilling at 40, 50, 60, and 70 days and placed in a 20 °C greenhouse under increasing daylength, spring conditions. Anthesis was faster and shoot length increased with longer chilling treatments. Trees exposed to –3 °C pretreatment flowered and grew best with 40 days of chilling. However, they did not flower faster or grow better than the other treatments with longer chilling times. There was no difference in flowering or growth between the 6 and 12 °C pretreatments. The 18 °C pretreatment resulted in slower flowering and very little growth after 40 and 50 days of chilling, but growth was comparable to other treatments after 70 days of chilling.

Development of a Quick and Easy-to-Install Strain Measurement Tool for Both Bending and Torsional Piping Stress Assessment

2016 ◽  
Author(s):  
Tsunemichi Takahama ◽  
Kazuma Nishimura ◽  
Seiichiro Ninomiya ◽  
Yoshihiro Matsumoto ◽  
Yutaka Harada
Keyword(s):  
Strain Gauge ◽  
Strain Measurement ◽  
Adhesive Bonding ◽  
Working Time ◽  
Measurement Tool ◽  
Stress Assessment ◽  
The Moment ◽  
Time Required ◽  
Longitudinal Strains

To assess the stresses on small-bore piping, we have developed a new tool that can be easily installed on a piping surface without adhesive bonding and that measures strains on piping quickly and accurately. This tool, which we call a “strain gauge holder,” is patented in Japan. As the tool can contain four strain gauge rosettes, with each rosette comprising three elements, the longitudinal strains and sheer strains can be measured synchronously at any four points precisely 90 degrees apart, with one point in each quadrant. By mockup testing, we confirmed that the measured bending and torsional strains by the holder were almost equivalent to the measured strains by the bonded gauges with adhesive, and that the holder made it possible to synchronously measure all of the strains resulting from the moment of force acting in three axes on the piping by measuring the bending and torsional strains in each quadrant. The strain gauge holder is expected to significantly reduce the pre- and post-working time required for strain measurement and stress assessment of piping in real plants.

scholarly journals Stress distribution in a rectangular plate having two opposing edges sheared in opposite directions

1923 ◽  
Vol 103 (723) ◽  
pp. 598-610 ◽  
Keyword(s):  
Shear Stress ◽  
Stress Distribution ◽  
Rectangular Plate ◽  
Royal Society ◽  
External Stress ◽  
The Other ◽  
Optical Methods ◽  
Centre Line ◽  
Distribution Of Stress

The type of deformation under investigation is indicated by fig. 1. A rectangular plate ABCD is deformed into the shape A'B'C'D'. The two opposing edges AB, CD are shifted horizontally without alteration of length into the position A'B', C'D', the other boundaries AD, BC being kept free from external stress. In a paper which appeared in the 'Proc. Royal Society', December 28, 1911, Prof. E. G. Coker investigated this same type of deformation using optical methods to determine the distribution of stress along the centre line OX. He found that if the plate was square the shear stress along OX was distributed in a munner which was approximately parabolic. As the ratio of AD to AB decreased the curve of distribution first of all became flat-topped, and for yet smaller ratios two distinct humps made their appearance.

Periodontal Mechanoreceptors and Parotid Secretion in Animals and Man

1987 ◽  
Vol 66 (2) ◽  
pp. 518-523 ◽  
Author(s):  
D.J. Anderson ◽  
M.P. Hector
Keyword(s):  
Strain Gauge ◽  
The Other ◽  
Parotid Saliva ◽  
Breakfast Cereal ◽  
Bite Block ◽  
Flow Rates ◽  
Remarkable Similarity ◽  
Positive Correlation ◽  
Periodontal Mechanoreceptors ◽  
Infiltration Anesthesia

Parotid flow was determined in rabbits during feeding. The animals produced more saliva when chewing hard laboratory pellets than with carrots, confirming the findings of Gjörstrup (1980a). We showed that one gland always produced more secretion than the other, and that the dominant gland alternated from side to side with changes in the chewing side. Strain-gauge recordings revealed a remarkable similarity in pattern between mandibular strain and ipsilateral parotid flow. Together, these data suggest that chewing movements and chewing force are involved in the control of parotid secretion. In man, flow rates of parotid saliva collected with a Lashley cup and cannula were recorded. During intermittent clenching on a bite block, we found: (1) a positive correlation between rectified integrated masseter EMG and parotid flow; and (2) that anesthesia of various intra-oral nerves could reduce the flow almost to zero. Crushing a particle of breakfast cereal between two teeth resulted in a reproducible parotid flow which was reduced by infiltration anesthesia around one of these teeth. These data point to the involvement of periodontal mechanoreceptors in the control of parotid secretion in rabbits and man.

Influence of Intermittent Air Introduction on Formation of Zn Films by Mechanical Coating Technique

2013 ◽  
Vol 750 ◽  
pp. 138-141
Author(s):  
Liang Hao ◽  
Yun Lu ◽  
Hiromasa Sato ◽  
Hiroshi Asanuma ◽  
Fu Sheng Pan
Keyword(s):  
Zinc Oxide ◽  
Adhesion Strength ◽  
The Other ◽  
Coating Process ◽  
Sem Images ◽  
Coating Technique ◽  
Zno Nanocrystals ◽  
Other Hand ◽  
Mechanical Coating

The influence of intermittent air introduction on the formation of Zn films during mechanical coating process was investigated. A series of contrast experiments were carried out. The XRD and EDS results showed that Zn particles were slightly oxidized. The SEM images indicated that disk-like zinc oxide (ZnO) nanocrystals were formed. The formation of disk-like ZnO made the morphology of Zn films more uneven and irregular. On the other hand, it increased the adhesion strength of Zn films to Al2O3 balls and hence the exfoliation of Zn films was not found.

Understanding Harmful Algal Bloom Dynamics in a Mediterranean Hypereutrophic Reservoir insights from a Bayesian Network and a Structural Equation Model

2020 ◽  
Author(s):  
Ibrahim Alameddine ◽  
Eliza Deutsch
Keyword(s):  
Bayesian Network ◽  
Structural Equation Model ◽  
Temperature Effects ◽  
Structural Equation ◽  
Nutrient Loading ◽  
Harmful Algal Bloom ◽  
Equation Model ◽  
The Other ◽  
Nutrient Loads ◽  
Bloom Formation

<p>Cyanobacteria blooms, especially those involving Microcystis, are an increasing problem facing many freshwater systems worldwide. In this study, a Bayesian Network (BN) along with a Structural Equation Model (SEM) were concurrently developed through data-driven learning and expert elicitation in order to better delineate the main pathways responsible for the Microcystis dominance in a Mediterranean semi-arid hypereutrophic reservoir. The resulting two model structures were then compared with regards to the pathways they identified between the physical lake conditions and the nutrient loads on one hand and Microcystis dominance on the other. The two models were also used to predict the probability of bloom formation under different scenarios of climate change and nutrient loading. Both models showed that, given the eutrophic status of the study reservoir, direct temperature effects appear to be the primary driving force behind the Microcystis growth and dominance. Indirect temperature effects, which modulated water column stratification and internal nutrient release, were also found to play an important role in bloom formation. On the other hand, both models revealed that the direct nutrient pathways were less important as compared to the temperature effects, with internal nutrient loads dominating over external loads due to the seasonal variability in river flows, typical of Mediterranean rivers. Nevertheless, the BN model was unable to capture the recursive relationships between Microcystis and its forcings.</p>

Are some strains of subterranean clover (T. subterraneum) highly susceptible to low temperature stress?

1980 ◽  
Vol 20 (103) ◽  
pp. 197 ◽  
Author(s):  
RC Rossiter ◽  
WJ Collins
Keyword(s):  
Low Temperature ◽  
Temperature Stress ◽  
Growth Temperature ◽  
Temperature Effects ◽  
Subterranean Clover ◽  
The Other ◽  
Field Observations ◽  
Winter Dormancy ◽  
Plant Experiment ◽  
Temperature Interaction

Two experiments, one with spaced plants and the other with swards, were conducted in a controlled-temperature glasshouse at Perth, Western Australia. Three strains-Phillip Island, CPI 18293 and CPI 68043H-were selected on the basis of field observations of apparent very poor winter growth in rows, and tested against Tallarook as a control. The temperature treatments were 22/17� (day/night) and 12/7�C. In the spaced plant experiment (occupying the first 48 days of growth), temperature and strain effects were highly significant, but there was no indication of a strain x temperature interaction. In the sward experiment (from days 51 to 77) temperature effects were small; and in only one strain, Phillip Island, was the decline in tops growth due to low temperature greater (P< 0.05) than for Tallarook. The experiments failed to provide support for the so-called 'winter dormancy' phenomenon. Possible explanations for the discrepancy between the present findings and the field observations are given.

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