Experimental Study on Controlled Impact Effect in Plastic Deformation Processes

2013 ◽  
Vol 772 ◽  
pp. 3-8
Author(s):  
Todor Penchev ◽  
Dimitar Karastojanov ◽  
Ivan Altaparmakov
Keyword(s):  
Experimental Study ◽  
Plastic Deformation ◽  
Rocket Engine ◽  
Free Fall ◽  
Impact Deformation ◽  
Deformation Processes ◽  
The Common ◽  
Set Up ◽  
The Impact ◽  
Impact Experiments

Controlled impact may be done if the source of additional force is placed on one of the impact bodies and this force is acting during the impact time. The use of Industrial Rocket Engine (IRE), produced in Bulgaria, enables the controlled impact technology. A laboratory set up was created in order to explore the controlled impact. Experiments on plastic deformation of lead specimens were conducted on this devise using controlled impact. An increase of the specimen deformation was obtained compared to the common free-fall impact deformation as well as a decrease of the rebound to zero (we called that a sticking impact). The results obtained make clear that the use of IRE propelled production machines for plastic deformation technologies improve those processes and decrease the production drain.

Study on Impinging Stream Flow Channel in Abrasive Flow Polishing Complex Cavity of Precision Mold

2013 ◽  
Vol 797 ◽  
pp. 469-474
Author(s):  
Di Feng Zhou ◽  
Dong Yu Liu
Keyword(s):  
Stream Flow ◽  
Plastic Material ◽  
Material Model ◽  
Impact Deformation ◽  
Element Simulation ◽  
Complex Cavity ◽  
Elastic Plastic Material ◽  
Set Up ◽  
The Impact ◽  
Abrasive Flow Polishing

In order to solve the problem about polishing complex cavity of precision mold, to improve the efficiency of processing and reduce the surface roughness, putting forward multiple entries impinging stream processing device.With making use of the collision of two strands of abrasive flow, Realizing the mutual disturbance of abrasive flow in the runner, and increasing the collision between abrasive to improve the disordering of abrasive movement, for promoting abrasive polishing to mold cavity. Johnson-Cook elastic-plastic material model is set up at the same time, using abaqus finite element simulation to simulate the impact deformation wear and cutting wear with the increasment of impact times.

scholarly journals De impact van taal en gender in negatieve reviews : Een experimentele studie naar gepercipieerde geloofwaardigheid en consumentengedrag

2020 ◽  
Vol 42 (1) ◽  
pp. 55-94
Author(s):  
Chloé Lybaert ◽  
Bernard De Clerck ◽  
Koen Plevoets ◽  
Tess Loete ◽  
Sofie Depovere
Keyword(s):  
Experimental Study ◽  
Consumer Behaviour ◽  
Online Review ◽  
Perceived Credibility ◽  
Language And Gender ◽  
And Gender ◽  
Set Up ◽  
The Impact

Abstract The impact of language and gender in negative reviews: an experimental study on perceived credibility and consumer behaviourThis paper explores the impact of language and gender on the perceptions of a negative online review and its writer. We set up an experiment with a 2 (language errors vs. no errors) x 2 (Standard Dutch vs. tussentaal, lit. ‘in-between-language’) x 2 (female vs. male reviewer) x 2 (female vs. male respondents) between-subjects design. 298 participants were asked to rate one scenario with a negative review on text credibility, usefulness, emotion, source intelligence, consumer intention and WOM-intention. The results show that both gender and language have a significant impact on the perceptions of the respondents. The perceived text credibility, intelligence of the reviewer, usefulness of the review and consumer intention are significantly lower when the negative review contains language errors and/or tussentaal features and when the reviewer is female. The Standard Dutch scenario without mistakes of the male reviewer generates the highest scores.

scholarly journals Evidence of high Sr/Ca in a Middle Jurassic murolith coccolith species

2020 ◽  
Author(s):  
Baptiste Suchéras-Marx ◽  
Fabienne Giraud ◽  
Alexandre Simionovici ◽  
Rémi Tucoulou ◽  
Isabelle Daniel
Keyword(s):  
Fluorescence Spectroscopy ◽  
Middle Jurassic ◽  
Photic Zone ◽  
X Ray ◽  
Continuous Record ◽  
The Common ◽  
Geochemical Analyses ◽  
Set Up ◽  
The Impact ◽  
Very High

Paleoceanographical reconstructions are often based on microfossil geochemical analyses. Coccoliths are the most ancient, abundant and continuous record of pelagic photic zone calcite producer organisms. Hence, they could be valuable substrates for geochemically based paleoenvironmental reconstructions but only Sr/Ca is exploited even if it remains poorly understood. For example, some murolith coccoliths species have very high Sr/Ca compared to the common 1-4 mmol/mol recorded in placolith coccoliths. In this study, we analyzed the elemental composition of the Middle Jurassic murolith Crepidolithus crassus by synchrotron-based nanoXRF (X-ray Fluorescence Spectroscopy) mapping focusing on Sr/Ca and compared the record to two placolith species, namely Watznaueria contracta and Discorhabdus striatus. In C. crassus, Sr/Ca is more than ten times higher than in both placoliths and seems higher in the proximal cycle. By comparison with the placoliths analyzed in the same analytical set-up and from the same sample, we exclude the impact of the diagenesis and seawater Sr/Ca to explain the high Sr/Ca in C. crassus. Based on comparisons to Pontosphaera discopora and Scyphosphaera apsteinii which also have high Sr/Ca, it seems more likely that high Sr/Ca in C. crassus is either due to the vertical elongation of the R-units of the proximal cycle or related to the action of the special polysaccharide controlling the growth of those vertically elongated R-units that may have affinities to Sr2+. In order to apply the Sr/Ca proxy to muroliths, further investigations are needed on cultured coccoliths.

Impact Deformation Model of Thin-Walled Shell Filled with Explosive under High Axial Shock Overload

2013 ◽  
Vol 455 ◽  
pp. 279-285
Author(s):  
Xiao Xia Sun ◽  
Wei Liu ◽  
Rui Qi Shen ◽  
Ying Hua Ye ◽  
Li Zhi Wu
Keyword(s):  
Plastic Deformation ◽  
Impact Damage ◽  
Plastic Deformation Zone ◽  
Deformation Model ◽  
Deformation Degree ◽  
Impact Stress ◽  
Gas Gun ◽  
Impact Deformation ◽  
Thin Walled ◽  
The Impact

The thin-walled shell axial impact deformation of one-leg electric detonator with different density charge was studied. The impact stress was analyzed, and on the basis of kinetic theory the impact deformation model was established for the thin-walled shell filled with explosive. The experiments were verified at 60 000g, 80 000g, 100 000g and 120 000g by gas gun. The results show that shell length decreases and the plastic deformation zone diameter increases after impact. Damage deformation degree decreases with increased shell strength, reduced shell and internal charging mass summation and reduced impact velocity square. The model calculated value agrees well with the test data. The deformation model can be used to predict overload damage deformation for such detonator.

Experimental Study on the Wet Molding for Wheat Straw Pellet Fuel

2010 ◽  
Vol 156-157 ◽  
pp. 284-292 ◽  
Author(s):  
Jian Jun Hu ◽  
Quan Guo Zhang ◽  
Ting Zhou Lei ◽  
Zhi Wei Wang
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Plastic Deformation ◽  
Linear Equation ◽  
Wheat Straw ◽  
Elastic Deformation ◽  
Moisture Ratio ◽  
Transitional Stage ◽  
Exponential Equation ◽  
The Impact

In the paper, in order to investigate the situation of impact on wet molding for straw of compressing speed and moisture ratio, and look for the inside law between them, closed compress experimental study on the wet molding for wheat straw pellet fuel was done by electrical universal material experimental machine and experimental provision made by oneself. Study on the impact situation for compressing speed and moisture ratio was done from pressure intensity, displacement and density of materiel. The result, which low compressing speed and low moisture ratio were propitious to wet molding, was gotten. The molding stage can be divided to loose stag, transitional stage, compressing stage. Partial elastic deformation mainly occurred In loose stage, and its mathematical model was linear equation. Elastic deformation mainly occurred In transitional stage, and its mathematical model was exponential equation. Plastic deformation mainly occurred In compressing stage, and its mathematical model was linear equation. The conclusion above has general directive significance to wet molding for straw pellet fuel.

Experimental study of thermohydraulic characteristics and irreversibility analysis of novel axial corrugated tube with spring tape inserts

2020 ◽  
Vol 92 (3) ◽  
pp. 30901
Author(s):  
Suvanjan Bhattacharyya ◽  
Debraj Sarkar ◽  
Ulavathi Shettar Mahabaleshwar ◽  
Manoj K. Soni ◽  
M. Mohanraj
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Thermal Performance ◽  
Working Fluid ◽  
The Novel ◽  
Heat Exchanger Tube ◽  
Heat Transfer Augmentation ◽  
Corrugated Tube ◽  
The Impact ◽  
Exchanger Tube

The current study experimentally investigates the heat transfer augmentation on the novel axial corrugated heat exchanger tube in which the spring tape is introduced. Air (Pr = 0.707) is used as a working fluid. In order to augment the thermohydraulic performance, a corrugated tube with inserts is offered. The experimental study is further extended by varying the important parameters like spring ratio (y = 1.5, 2.0, 2.5) and Reynolds number (Re = 10 000–52 000). The angular pitch between the two neighboring corrugations and the angle of the corrugation is kept constant through the experiments at β = 1200 and α = 600 respectively, while two different corrugations heights (h) are analyzed. While increasing the corrugation height and decreasing the spring ratio, the impact of the swirling effect improves the thermal performance of the system. The maximum thermal performance is obtained when the corrugation height is h = 0.2 and spring ratio y = 1.5. Eventually, correlations for predicting friction factor (f) and Nusselt number (Nu) are developed.

Isolation and characterization of oleochemical compounds from watermelon seed

2020 ◽  
Vol 10 (4) ◽  
pp. 79-82
Author(s):  
Madhubhushan M ◽  
Seshaiah S ◽  
Chandrudu J ◽  
Sagar R ◽  
Akila CR
Keyword(s):  
Cutting Tool ◽  
Citrullus Lanatus ◽  
Fatty Esters ◽  
Mineral Oils ◽  
Light Yellow ◽  
Isolation And Characterization ◽  
The Common ◽  
Set Up ◽  
Natural Gradation

The common watermelon item (Citrullus lanatus) seeds were gained from castoffs verdant nourishments for use by decorating, sun ventilation and pulverizing. Light yellow-toned oil was gotten by dissolvable withdrawal using oil atmosphere and the going with traits were gotten using oil ether: pH, refractive rundown, thickness, dissolvable miscibility, coagulating temperature, fire nature, express gravity, streak point and warmth of consuming. With a shallow level of unsaturation, stepped level of smoothness, and proximity of raised degree of the sensible proportion of free unsaturated fats. The low assessment of the solidifying temperature of the oil offered a hint that the oil can be managed in various areas paying little heed to the qualification in temperature. The following level of linoleic destructive of the oil offers a hint of natural gradation of solidarity. Fatty esters are increasing expanding significance as a biodegradable swap for mineral oils. In some request regions, for example, cutting tool oil, gearbox, pressure-driven oils, and greases for raw petroleum creation, the oleochemical items are set up. Nonetheless, certain particular wellsprings of fatty esters are hitherto to be abused for this comparative reason. This exploration subsequently tests into one of the less used wellsprings of fatty esters in watermelon. The oil from the kernels demonstrations a top-notch yield presents significant utilitarian gatherings for change and thus was utilized to set up an assortment of oleochemicals which demonstrated excellence materials in contrast with the routinely utilized oils feed frameworks for oleochemicals after portrayal. The photopolymers acquired indicated piercing vinyl protons for consistent polymerize.

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