scholarly journals EFFECT OF STORAGE DURATION ON MECHANICAL PROPERTIES OF BELLO EGGPLANT FRUIT UNDER QUASI COMPRESSION LOADING

2019 ◽  
Vol 7 (5) ◽  
pp. 311-320
Author(s):  
Umurhurhu Benjamin ◽  
Uguru Hilary

The mechanical properties of eggplant fruit (cv. Bello) harvested at physiological maturity stage were evaluated in three storage periods (3d, 6d and 9d). These mechanical parameters (rupture force, rupture energy and deformation at rupture point) were measured under quasi compression loading, using the Universal Testing Machine (Testometric model). The fruit’s toughness and rupture power were calculated from the data obtained from the rupture energy and deformation at rupture point. Results obtained showed that mechanical properties of the Bello eggplant fruit exhibited strong dependence on the storage period. The results showed that as the Bello fruit stored longer, its rupture force and rupture energy decreased from 812 N to 411 N, and 5.58 Nm to 3.11 Nm respectively. While the rupture power decreased from 1.095 W to 0.353 W. On the contrary, the toughness and deformation at rupture increased from 0.270 mJ/mm3 to 0.403 mJ/mm3, and 16.99 mm to 25.22mm respectively during the 9 days storage period. The knowledge of the mechanical properties of fruits is important for their harvest and post-harvest operations, therefore, information obtained from this study will be useful in the design and development of machines for the mechanization of eggplant production.

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1303
Author(s):  
Michael Seidenstuecker ◽  
Thomas Schmeichel ◽  
Lucas Ritschl ◽  
Johannes Vinke ◽  
Pia Schilling ◽  
...  

This work aimed to determine the influence of two hydrogels (alginate, alginate-di-aldehyde (ADA)/gelatin) on the mechanical strength of microporous ceramics, which have been loaded with these hydrogels. For this purpose, the compressive strength was determined using a Zwick Z005 universal testing machine. In addition, the degradation behavior according to ISO EN 10993-14 in TRIS buffer pH 5.0 and pH 7.4 over 60 days was determined, and its effects on the compressive strength were investigated. The loading was carried out by means of a flow-chamber. The weight of the samples (manufacturer: Robert Mathys Foundation (RMS) and Curasan) in TRIS solutions pH 5 and pH 7 increased within 4 h (mean 48 ± 32 mg) and then remained constant over the experimental period of 60 days. The determination surface roughness showed a decrease in the value for the ceramics incubated in TRIS compared to the untreated ceramics. In addition, an increase in protein concentration in solution was determined for ADA gelatin-loaded ceramics. The macroporous Curasan ceramic exhibited a maximum failure load of 29 ± 9.0 N, whereas the value for the microporous RMS ceramic was 931 ± 223 N. Filling the RMS ceramic with ADA gelatin increased the maximum failure load to 1114 ± 300 N. The Curasan ceramics were too fragile for loading. The maximum failure load decreased for the RMS ceramics to 686.55 ± 170 N by incubation in TRIS pH 7.4 and 651 ± 287 N at pH 5.0.


2014 ◽  
Vol 28 (4) ◽  
pp. 543-548 ◽  
Author(s):  
Thasaiya A. Selvam ◽  
Musuvadi R. Manikantan ◽  
Tarsem Chand ◽  
Rajiv Sharma ◽  
Thirupathi Seerangurayar

Abstract The present study was carried out to investigate the compression loading behaviour of five Indian sunflower varieties (NIRMAL-196, NIRMAL-303, CO-2, KBSH-41, and PSH- 996) under four different moisture levels (6-18% d.b). The initial cracking force, mean rupture force, and rupture energy were measured as a function of moisture content. The observed results showed that the initial cracking force decreased linearly with an increase in moisture content for all varieties. The mean rupture force also decreased linearly with an increase in moisture content. However, the rupture energy was found to be increasing linearly for seed and kernel with moisture content. NIRMAL-196 and PSH-996 had maximum and minimum values of all the attributes studied for both seed and kernel, respectively. The values of all the studied attributes were higher for seed than kernel of all the varieties at all moisture levels. There was a significant effect of moisture and variety on compression loading behaviour.


2012 ◽  
Vol 479-481 ◽  
pp. 1145-1150
Author(s):  
Xiao Feng Xu ◽  
Wen Bin Yao ◽  
Jiu Hua Xu ◽  
Wei Zhang

In order to get the physical mechanics of gingko,hickory nut and their stalks, microprocessor controlled electronic universal testing machine (WDW-5E) was used to study the basic physical characteristics,pulling resistance and cutting resistance of their stalk in different harvest time and moisture contents. The impact of physical mechanics of cones and stalks on the picking process were analyzed and some concrete suggestions were put forward in the paper. This experimental study provides an important theory basis on designing and manufacturing different cones picking machine.


2012 ◽  
Vol 624 ◽  
pp. 279-282
Author(s):  
Feng Zhan ◽  
Nan Chun Chen

Talc was modified by aluminate coupling agent (ACA) before filling it into high density polypropylene (HDPP) to prepare talc/HDPP composites. Scanning electron microscopy (SEM), wear testing machine, electronic universal testing machine, and impact testing machine were used to analyze the surface modification and the effects of modified talc on friction and mechanical properties of modified talc/HDPP composites. The results indicate that after modified the lamellar structure of talc particles are open and the dispersion of particles are improved, and the edges and corners of surface become softer. Friction properties indicate that when the talc content is 8 wt%, both µ and K are at a lower value, which show that have better wear resistance. The frictional surface is relatively smooth and no furrow trace has found. Mechanical properties show that with talc content increasing, tensile strength and flexural strength of composites increase.


2017 ◽  
Vol 732 ◽  
pp. 32-37 ◽  
Author(s):  
Ming He Wang ◽  
Xiao Dong Du ◽  
Yu Kun Li ◽  
Zhen Zhang ◽  
Hai Lin Su ◽  
...  

The as-cast microstructures and mechanical properties of Al-Si-Mg-Cu-Ti alloys with and without Sc were investigated by metallographic microscope, field emission scanning electron microscope, energy spectrum analysis, transmission electron microscope and universal testing machine. The result shows that adding 0.20wt.% Sc into the casting alloy can refine the grain, change the growth morphology from dendrite to fine equiaxed grain, and the morphology of eutectic Si by rough laminar structure into fine fibrous. The tensile strength of alloy with 0.20wt.% Sc is up to 304.4 MPa after T6 heat treated, which is close to that of 6061 forging aluminum alloy.


2014 ◽  
Vol 915-916 ◽  
pp. 992-995
Author(s):  
Shuang Liu ◽  
Wei Tan Cui ◽  
Hong Wu Zhang ◽  
Yong Quan Ma

The fracture reasons of 500kV high-voltage disconnectors hoops were analyzed. The fracture appearance, composition of chemical elements, metallographic, mechanical properties of the fractured hoops were investigated by ICP-AES, SEM, optical microscope, brinell hardness tester, universal testing machine. The test results that one reason is substandard products of this batch hoop. The composition of chemical elements and mechanical properties is fails to comply with applicable standards prescribed and the casting defects are found. Another reason is that the large pre-tightening force and tightens reverse order.


2013 ◽  
Vol 446-447 ◽  
pp. 312-315
Author(s):  
Ramaraju Ramgopal Varma ◽  
Abdullah Bin Ibrahim ◽  
B. Ravinder Reddy

The present research paper aims in evaluating the strength of the welded AA6351 alloy plates of 6 mm thick by using friction stir welding technique at different rotational speeds The applied welding technique is capable of achieving the mechanical properties of the alloy close to that of the original alloy. In the present investigation, the speeds of the spindle were varied from 1100 rpm to 1500 rpm with a constant transverse speed of 20 mm/min. The tensile strength of the joints is determined by an universal testing machine. The results from the present investigation show that the values of the yield strength were very much closer to the values of the AA6351Alloy prior to welding. It has been found from the experiments that the strength of the joints increases with the increase in the rotational speed; however, the same is decreasing after achieving certain speed.


2018 ◽  
Vol 50 (3) ◽  
pp. 337-345 ◽  
Author(s):  
Arputhavalli Johnsy ◽  
S. Agilan ◽  
M. Dinesh ◽  
S.J. Vijay ◽  
Roy Johnson

Co-Ni-Al alloy samples were prepared by compacting the powdered alloy at various pressures in proper stoichiometric ratio and the high density compacted alloy was sintered at 673 K. The magnetic, mechanical properties, microstructure and phase analysis were studied and compared with that of spark plasma sintered (SPS) alloy. The sintered alloy exhibit martensitic twin variants with ? phase structure. Along with the diffused particle, few agglomerated clusters were observed on the topographic images. The magnetic and the mechanical studies of the test specimens were investigated using the vibrating sample magnetometer, pin on disk tribometer and universal testing machine respectively. The coercivity value and the ductility of the SPS alloy are higher than the same of the as-sintered alloy.


Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5642
Author(s):  
Branislava Petronijevic Sarcev ◽  
Sebastian Balos ◽  
Dubravka Markovic ◽  
Ivan Sarcev ◽  
Marija Vukcevic ◽  
...  

The objective of this work was to measure and correlate the degree of conversion (DC), mechanical properties and monomer elution from self-, dual- and light-cured core composites. Five samples of each of the following materials were prepared for each test: Clearfil (Core, Photo Core, Automix), Bisco (Core-Flo, Light-Core and Bis-Core). DC was determined using FTIR, compressive and flexural strength and modulus of elasticity using a universal testing machine and microhardness using Vickers hardness. Elution was measured using HPLC. One-way ANOVA with Tukey’s post-test and Pearson’s correlation were used to statistically analyze the data. DC of Clearfil-Dual (70.1%) and Clerafil-Photo (66.8%) were higher than Clearfil-Self (55.4%) and all Bisco materials (51.4–55.3%). Flexural strength of Clearfilwas higher than that of Bisco composites. The Microhardness of Clearfil-Dual (119.8VHN) and Clearfil-Photo (118.0VHN) were higher compared to other materials. The greatest elution was detected from self-cured materials. DC positively correlated to microhardness and compressive/flexural strength and negatively to BisGMA elution. Clearfil-Photo and Automix showed higher conversion, lower monomer elution and, generally, better mechanical properties. Self-cured composites should not be recommended for routine clinical use as their performance was inferior to dual- and light-cured composites. Microhardness may be used as an indicator of elution.


2021 ◽  
Vol 7 (2) ◽  
Author(s):  
Rindri Ruri Suryani ◽  
Abdul Hakim ◽  
Yusrianti Yusrianti ◽  
Shinfi Wazna Auvaria ◽  
Ika Mustika

Plastik sintetis merupakan plastik yang biasanya berbasis konvensional. Sumber bahan baku plastik sintetis merupakan energi yang tidak dapat diperbarui yaitu minyak bumi. Plastik sintetis memiliki sifat fisik yang fleksibel, ringan, kuat dan ekonomis. Plastik sintetis dapat menyebabkan permasalahan lingkungan yaitu sulitnya plastik sintetis yang terdegradasi oleh tanah. Sehingga dapat menurunkan kualitas tanah dan mikriorganisme. Upaya pencegahan permasalahan sampah plastik dapat dilakukan dengan pengembangan pembuatan plastik dari bahan polimer alami yang disebut bioplastik.  Plastik biodegradableumumnya terbuat dari bahan polisakarida dan dapat terbuat dari sumber protein, salah satunya limbah tahu. Penelitian ini bertujuan untuk memanfaatkan limbah tahu yang diekstrak untuk diambil proteinnyasebagai bahan dasar pembuatan plastik biodegradable, serta untuk mengetahui sifat mekanik dan lama bioplastik protein ampas tahu terdegradasi oleh tanah. Pembuatan bioplastik membutuhakan bahan pemlastis dan bahan aditif untuk menghasilkan plastik yang fleksibel. Penelitian  ini menggunakan penambahan plasticizerglycerin dengan variasi 30%,40%,50% dan bahan pengisi 20%. Penambahan chitosan sebanyak 5 ml. Hasil penelitian pembuatan protein ampas tahu menunjukkan bahwa kadar protein ampas tahu yang dihasilkan dari tahap diekstraksi sebesar 29.72%. Hasil pengujian kuat tarik bioplasik dari protein ampa tahu menggunakan alat UTM (Universal Testing Machine) yangberkisar antara 1.04-2.12 Mpa yang telah memenuhi standar bioplastik menurut Japan Industrial Standard (JIS). Sedangkan hasil pengujian daya serap air menggunakan metode swelling memiliki nilai tertinggi pada glycerin 50% sebesar 196% dalam kurun waktu 30 menit. Sedangkan daya serap paling baik terdapat pada variasi glycerin 30% sebesar 49.7%. Bioplastik berbahan dasar protein ampas tahu dapat terdegrdasi dengan sempurna dalam kisaran waktu 7-14 hari.  Kata kunci: biodegradable plastik, biodegradasi, chitosan, glycerin, sifat mekanik.  Synthetic plastics are plastics that are usually conventional based. The source of synthetic plastic raw material is non-renewable energy, namely petroleum. Synthetic plastics have physical properties that are flexible, lightweight, strong and economical. Synthetic plastics can cause environmental problems, namely the difficulty of synthetic plastics which are degraded by soil. So that it can reduce soil quality and microorganisms. Efforts to prevent the problem of plastic waste can be done by developing the manufacture of plastics from natural polymer materials called bioplastics. Biodegradable plastics are generally made of polysaccharides and can be made from protein sources, one of which is tofu waste. This study aims to utilize the extracted tofu waste for protein as a basic material for making biodegradable plastics, as well as to determine the mechanical properties and length of time for the tofu pulp protein to be degraded by the soil. The manufacture of bioplastics requires plasticizers and additives to produce flexible plastics. This study used the addition of glycerol plasticizer with a variation of 30%, 40%, 50% and 20% filler. The addition of 5 ml of chitosan. The results of the research on making tofu pulp protein showed that the protein content of tofu pulp from the extraction process was 29.72%. Bioplastic tensile strength value from tofu pulp ranges from 1.04-2.12 MPa which has met the bioplastic standards according to the Japan Industrial Standard (JIS). The highest water absorption capacity of bioplastics from tofu pulp protein was found in the glycerol 50% variation of 196% within 30 minutes. Meanwhile, the lowest absorption rate was found in the 30% glycerol variation of 49.7%. Bioplastics from tofu pulp protein can completely decompose in 7-14 days. Keywords: chitosan, degradation, glycerol, mechanical properties, plastic biodegradable.


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