Experimental Study of Tensile and Flexural Strength of Cottonseed Hull Reinforced Epoxy Composites

2020 ◽  
Vol 1158 ◽  
pp. 99-103
Author(s):  
Mingyu Cho
Keyword(s):  
Experimental Study ◽  
Stainless Steel ◽  
Testing Machine ◽  
Epoxy Composites ◽  
Reinforced Composites ◽  
Flexural Test ◽  
Steel Mold ◽  
Reinforced Composite ◽  
Universal Testing ◽  
Cottonseed Hull

In this study, the tensile and flexural strengths of cottonseed hull reinforced epoxy composites were investigated. Specimens were made using a stainless steel mold. A hand lay-up process was used to make the composite material, and three kinds of materials were made: unreinforced epoxy, raw cottonseed hull reinforced composite, and grinded cottonseed hull reinforced composite. The fiber content of all composites is 15 wt%. Tensile and flexural test were performed with universal testing machine. The result shown that Tensile and flexural strengths of grinded cottonseed hull reinforced composites were found to be the highest.

Tensile Behavior of Woven Hybrids Composites

2010 ◽  
Author(s):  
E. Sevkat ◽  
B. M. Liaw ◽  
F. Delale
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Finite Element ◽  
Hybrid Composites ◽  
Testing Machine ◽  
Tensile Behavior ◽  
Resin Composites ◽  
Reinforced Composites ◽  
Universal Testing ◽  
Graphite Fibers

This paper presents an experimental study to investigate the tensile behavior of plain-weave hybrid S2 glass-IM7 graphite fibers/toughened SC-79 resin (cured at 177°C) composite strips. The tests were conducted on hybrid S2 glass-IM7 graphite fibers/toughened SC-79 resin and non-hybrid S2 glass-fiber/toughened SC-79 resin composites strips using a 22-kip MTS servo hydraulic universal testing machine. To use in Finite Element Modeling, the mechanical properties of these composite specimens with four lay-up sequences were determined. It was observed that the hybrid composites mechanical properties were somewhere between those of glass and graphite reinforced composites.

scholarly journals PENGARUH ORIENTASI DAN VOLUMETRIK GLASS FIBER NON DENTAL TERHADAP KEKUATAN PERLEKATAN GESER FIBER REINFORCED COMPOSITES UNTUK SPLINTING PERIODONTAL

2018 ◽  
Vol 2 (1) ◽  
pp. 1-9
Author(s):  
Dedi Sumantri ◽  
Siti Sunarintyas ◽  
Dahlia Herawati
Keyword(s):  
Glass Fiber ◽  
Testing Machine ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Fiber Mats ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Universal Testing ◽  
Post Hoc

Fiber Reinforced Composite (FRC) menggunakan E-glass fiber dental dalam bidang kedokteran gigi telah banyak diaplikasikan secara klinis, salah satunya dalam aplikasi splinting periodontal. Ketersediaan E-glass fiber dental di Indonesia masih terbatas dengan harga relatif mahal. Terdapat glass fiber non dental di Indonesia yang banyak digunakan bidang teknik, dengan harga terjangkau. Tujuan dari penelitian ini untuk mengetahui pengaruh orientasi dan volumetrik glass fiber non dental terhadap kekuatan perlekatan geser FRC pada splinting periodontal. Bahan penelitian berupa glass fiber non dental yang terdiri dari tiga jenis yaitu glass fiber mats (LT, China), glass fiber roving (CMAX, China), dan glass fiber woven roving (HJ, China), serta E-glass fiber dental (Fiber-Splint, Polidentia SA, Switzerland). Objek dibagi menjadi 8 kelompok, masing-masing kelompok terdiri atas 4 sampel. Kelompok I (kontrol) tanpa penambahan glass fiber non dental, kelompok II E-glass fiber dental 2,8 vol%, dan kelompok III - VIII terdiri dari glass fiber non dental mats, glass fiber non dental roving, dan glass fiber non dental woven roving, dengan fraksi volumetrik 2,8 dan 5,4 vol%. Seluruh sampel direndam dalam air destilasi selama 24 jam pada suhu 37o C. Pengujian kekuatan perlekatan geser menggunakan Universal Testing Machine. Data dianalisis menggunakan ANAVA dua jalur, uji t dan LSD. Hasil penelitian menunjukkan rerata kekuatan perlekatan geser (MPa) terendah pada kelompok tanpa fiber (kontrol) (8,95 ± 0,95) dan tertinggi pada 5,4 vol% glass fiber non dental woven roving (14,11 ± 0,35). Hasil analisis ANAVA dua jalur menunjukkan variabel orientasi dan volumetrik glass fiber non dental memberikan pengaruh signifikan (p<0,05). Uji post hoc LSD dan uji t menunjukkan perbedaan signifikan (p<0,05) pada seluruh kelompok perlakuan untuk variabel orientasi dan volumetrik. Kesimpulan penelitian ini adalah orientasi dan volumetrik glass fiber non dental memberikan pengaruh terhadap peningkatan kekuatan perlekatan geser FRC.

Test of Physical Mechanical Properties of Gingko，Hickory Nut and their Stalks

2012 ◽  
Vol 479-481 ◽  
pp. 1145-1150
Author(s):  
Xiao Feng Xu ◽  
Wen Bin Yao ◽  
Jiu Hua Xu ◽  
Wei Zhang
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Testing Machine ◽  
Physical Characteristics ◽  
Harvest Time ◽  
Cutting Resistance ◽  
Moisture Contents ◽  
Universal Testing ◽  
The Impact ◽  
Physical Mechanics

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.

scholarly journals Characterization of Composite Laminates Subjected to Repeated Indentation

2014 ◽  
Vol 14 (2) ◽  
pp. 46-56
Author(s):  
M. Ashok Kumar ◽  
A.M.K. Prasad ◽  
D.V. Ravishankar ◽  
G. Giridhar
Keyword(s):  
Stainless Steel ◽  
Bearing Capacity ◽  
Fiber Orientation ◽  
Composite Laminates ◽  
Testing Machine ◽  
High Strength ◽  
Surface Damage ◽  
Load Bearing Capacity ◽  
Universal Testing

Abstract The effect of the fiber orientation in a laminate is investigated experimentally when subjected repeated quasistatic indentation. All the laminates with different fiber orientation are subjected to indentation with a stainless steel spherical indenter of diameter 8.0mm on a universal testing machine for a maximum indenter displacement of 4mm. The rate of indenter displacement was 0.5mm/minute. Different parameters like load bearing capacity, indentation diameter, area of surface damage, etc., were recorded after 4mm of indenter displacement. All the parameters were studied and compared to evaluate the laminate with high strength

scholarly journals Pengaruh Komposisi Glass Fiber Non Dental dan Penambahan Silane terhadap Kekuatan Geser Fiber Reinforced Composite sebagai Retainer Ortodonsi

2015 ◽  
Vol 1 (1) ◽  
pp. 53
Author(s):  
Dian Noviyanti Agus Imam ◽  
Siti Sunarintyas ◽  
Nuryono Nuryono
Keyword(s):  
Bond Strength ◽  
Glass Fiber ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Fiber Composition ◽  
Reinforced Composite ◽  
Universal Testing ◽  
Post Test

Retainer dibutuhkan untuk membantu menstabilkan posisi gigi geligi selama proses reorganisasi jaringan periodontal berlangsung. Retainer FRC ortodonsi dikembangkan sebagai alternatif material estetika serta aman bagi pasien alergi terhadap nikel. E-glass fiber lebih sering digunakan sebagai retainer ortodonsi. Penelitian ini bertujuan untuk mengkaji pengaruh komposisi glass fiber non dental dan penambahan silane terhadap kekuatan geser FRC sebagai retainer ortodonsi. Subjek penelitian terdiri dari 9 kelompok perlakuan dengan 3 jenis glass fiber yang berbeda yaitu glass fiber non dental A (LT, Cina), B (CMAX, Cina) dan C (HJ, Cina). Masing-masing glass fiber diberi perlakuan yang bervariasi yaitu tanpa penambahan silane, penambahan silane 1x dan 2x. Subjek penelitian direndam dalam akuades dan disimpan pada suhu 37ºC selama 24 jam sebelum dilakukan uji kekuatan geser dengan menggunakan alat Universal Testing Machine. Hasil penelitian dianalisis variansi dua jalur dan post hoc Tukey untuk mengetahui perbedaan statistik masing-masing kelompok. Hasil penelitian menunjukkan bahwa glass fiber non dental A dengan penambahan 2x silane memiliki rerata kekuatan geser tertinggi (12,72±2,02 MPa) sedangkan glass fiber non dental B tanpa penambahan silane memiliki rerata kekuatan geser terendah (6,96±1,69 MPa). Terdapat perbedaan bermakna antara komposisi fiber maupun penambahan silane terhadap kekuatan geser FRC (p<0,05). Tidak terdapat perbedaan bermakna pada letak kegagalan FRC (p>0,05). Berdasarkan hasil penelitian dapat disimpulkan bahwa komposisi SiO2 dan Al2O3 yang tinggi pada glass fiber non dental serta penambahan silane dapat meningkatkan kekuatan geser FRC. The Effect of Non Dental Glass Fiber Composition and Silane Addition on The Shear Bond Strength of Fiber Reinforced Composite as An Orthodontic Retainer. Retainers are required to stabilize the position of the teeth to permit reorganization of periodontal tissue. FRC orthodontic retainer was developed as an alternative material aesthetic and safe for nickel allergic patients. E-glass fiber is commonly used as an orthodontic retainer. The purpose of this study was to assess the effect of non dental glass fiber composition and silanes addition on the shear bond strength of the FRC as an orthodontic retainer. This study consisted of 9 treatment groups with three different types of non dental glass fiber, namely non dental glass fiber A (LT, China), B (CMAX, China) and C (HJ, China). Each glass fiber was given a variation treatment, without silanes, one time and two times of silanes addition. All the samples were stored in distilled water at 37ºC for 24 hours and subsequently tested for shear strength by using Universal Testing Machine.The groups were submitted to two way ANOVA analysis of variance with Tukey post test to verify the statictical difference between groups. The results showed that a non dental glass fiber A with two times of silanes addition has the highest shear bond strength (12,72±2,02 MPa), meanwhile a non dental glass fiber B without silane addition has the lowest shear bond strength (6,96±1,69 MPa). There were significant differences between the composition of glass fiber and the addition of silane toward the shear bond strength of FRC (p<0,05). No significant differences in debonded locations of FRC (p>0,05). Based on the results of this study concluded that the composition of the high SiO2 and Al2O3 in the non dental glass fiber  and the silanes addition can increase the shear bond strength FRC.

scholarly journals Comparative Analysis of the Mechanical Properties between the Fiber-Reinforced Composite and Zirconium Posts

PRILOZI ◽  
2015 ◽  
Vol 36 (3) ◽  
pp. 138-149
Author(s):  
Vesna Jurukovska-Shotarovska ◽  
Biljana Kapusevska
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Comparative Analysis ◽  
Bending Strength ◽  
Testing Machine ◽  
Fracture Force ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Universal Testing ◽  
Subgroup Ii

Abstract Objectives: To make a comparative analysis of the mechanical properties between FRC and zirconium posts Methods: The patients with FRC and zirconium posts were divided in two groups with three subgroups, each of them composed of 10 samples. Subgroup I with 1.2 mm; Subgroup II with 1.35 mm and Subgroup III with 1.5 mm post diameter. The fracture force, bending and tensile strength of each group were measured with Shimadzu Universal Testing Machine. Results: The fracture force for the first group measured in the first, second and third subgroup was 34.80900N; 67.15390N; 46.53100N and for the second group, first, second and third subgroup was 34.80900N; 46.53100N; 67.15390N correspondingly. The bending strength for the first group measured in the first, second and third subgroup was 401.4420N; 444.6425N; 333.6828N and for the second group, first, second and third subgroup was 307.9352N; 289.1030N; 304.1649N correspondingly. The tensile strength for the first group measured in the first, second and third subgroup was 5.442267N; 4.350545N; 2.943465N and for the second group, first, second and third subgroup was 4.224141N; 3.751466N; 3.168756N correspondingly. Conclusions: The longest diameter of the posts significantly increases the resistance to fracture in relation to the two smaller diameters. The larger diameter, the higher values of the bending strength, as well as the lowest values of the tensile strength of the material contribute to improved mechanical properties of the fiber and zirconium posts.

A STUDY OF STRESS RELAXATION RATE IN UN-IRRADIATED AND NEUTRON-IRRADIATED STAINLESS STEEL

2007 ◽  
Vol 21 (05) ◽  
pp. 295-301 ◽  
Author(s):  
I. M. GHAURI ◽  
NAVEED AFZAL ◽  
N. A. ZYREK
Keyword(s):  
Stainless Steel ◽  
Stress Relaxation ◽  
Relaxation Rate ◽  
Room Temperature ◽  
Tensile Deformation ◽  
Testing Machine ◽  
Universal Testing ◽  
Radiation Induced ◽  
Stress Dependent ◽  
Induced Defects

Stress relaxation rate in un-irradiated and neutron-irradiated 303 stainless steel was investigated at room temperature. The specimens were exposed to 100 mC, Ra-Be neutron source of continuous energy 2–12 MeV for a period ranging from 4 to 16 days. The tensile deformation of the specimens was carried out using a Universal Testing Machine at 300 K. During the deformation, straining was frequently interrupted by arresting the cross head to observe stress relaxation at fixed load. Stress relaxation rate, s, was found to be stress dependent i.e. it increased with increasing stress levels σ0 both in un-irradiated and irradiated specimens, however the rate was lower in irradiated specimens than those of un-irradiated ones. A further decrease in s was observed with increase in exposure time. The experiential decrease in the relaxation rate in irradiated specimens is ascribed to strong interaction of glide dislocations with radiation induced defects. The activation energy for the movement of dislocations was found to be higher in irradiated specimens as compared with the un-irradiated ones.

Effect of Biofilm Dryness on the Transfer of Listeria monocytogenes Biofilms Grown on Stainless Steel to Bologna and Hard Salami

2007 ◽  
Vol 70 (11) ◽  
pp. 2480-2484 ◽  
Author(s):  
ANDRÉS RODRÍGUEZ ◽  
WESLEY R. AUTIO ◽  
LYNNE A. McLANDSBOROUGH
Keyword(s):  
Stainless Steel ◽  
Listeria Monocytogenes ◽  
Constant Pressure ◽  
Testing Machine ◽  
The United States ◽  
Activity Levels ◽  
Universal Testing ◽  
Cell Surface Interactions ◽  
Food Recalls ◽  
Statistical Analysis Software

Listeria monocytogenes continues to be a major cause of class I food recalls in the United States. Very little is known about its transfer and cross-contamination in processing scenarios. The objective of this study was to evaluate the effect of hydration level on L. monocytogenes biofilms grown on stainless steel and its effect on the biofilm transfer to foods. Biofilms were grown on stainless steel in diluted tryptic soy broth 1:20 for 48 h at 32°C. After this, biofilms were equilibrated over saturated salt solutions at 20°C for 24 h (94, 75, 58, and 33% relative humidity; % RH) prior to transferring. Transfer experiments were conducted from inoculated stainless steel to bologna and hard salami at a constant pressure (45 kPa) and time (30 s) with a universal testing machine. The experiment was designed with a factorial design 4 × 2 (biofilms equilibrated at 4% RH and two foods) and duplicated every day, and the whole experiment was repeated nine times. The results were analyzed with an analysis of variance by SAS Statistical Analysis Software. Our results showed that more bacteria were transferred to bologna (mean efficiency of transfer [EOT] = 3.0) than to hard salami (mean EOT = 0.35, P &lt; 0.01). As biofilms became drier, the transfer of Listeria from stainless steel to both foods increased (P &lt; 0.05). The EOT increased from 2 to 3.8 and from 0.2 to 0.51 upon transfer when drying the biofilm for bologna and hard salami, respectively. This study may be an indication that as biofilms were dried, the cell-cell and cell-surface interactions became weaker, and bacterial transfer increased. This phenomenon was enhanced in foods containing higher water activity levels. We hypothesize that this increased in transfer was due to the presence of capillary forces in the food.

scholarly journals Fracture Resistance of Teeth Restored with Bulk-Fill and Fiber-Reinforced Composites in Class II Cavities

2020 ◽  
pp. 239-249
Author(s):  
Gül Keskin ◽  
Zübeyde Uçar Gündoğar ◽  
Gün Burak Tek
Keyword(s):  
Fracture Resistance ◽  
Testing Machine ◽  
Third Molar ◽  
Class Ii ◽  
Composite Fiber ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite

This study aimed to evaluate the fracture resistance of teeth restored with conventional, bulk-fill, and fiber-reinforced composite materials regarding intact teeth. Standard cavities were prepared on 70 sound third molar teeth. The teeth were randomly divided into six groups: intact teeth, conventional Bis-GMA based composite, fiber-reinforced composite, Bis-GMA based bulk-fill composite, ormocer based bulk-fill composite, glass containing resin-based bulk-fill composite. The data was obtained by a Universal Testing Machine and analyzed statistically. Fracture resistance of the teeth restored with conventional composite was significantly lower than the other groups (p<0.05). The teeth restored with fiber-reinforced composite showed the highest fracture resistance; however, there were no statistically significant differences between intact teeth and teeth restored with fiber-reinforced composite, Bis-GMA based bulk-fill composite, and glass containing resin-based bulk-fill composite (p>0.05). The obtained data showed that restoring teeth with bulk-fill and fiber-reinforced composites could be recommended in Class II cavities.

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