Tensile strength analysis of serially pinned joints in E-glass composite plates

2020 ◽  
Vol 21 ◽  
pp. 78-82
Author(s):  
A. Naveenraj ◽  
R. Karthick ◽  
P. Baskaran
Keyword(s):  
Tensile Strength ◽  
Composite Plates ◽  
Strength Analysis ◽  
Glass Composite ◽  
Pinned Joints

Notched tensile strength of randomly oriented E-glass composite laminates

2000 ◽  
Vol 282 (1-2) ◽  
pp. 59-66 ◽  
Author(s):  
P.K. Govindan Potti ◽  
B. Nageswara Rao ◽  
V.K. Srivastava
Keyword(s):  
Tensile Strength ◽  
Composite Laminates ◽  
Glass Composite ◽  
Notched Tensile Strength

The Tensile Strength of Glass Yarn in Rubber. II. The Effects of Normal Humidities

1972 ◽  
Vol 45 (1) ◽  
pp. 49-59 ◽  
Author(s):  
R. A. Gregg
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Glass Composite ◽  
Moisture Index ◽  
Permanent Loss ◽  
Dry Conditions ◽  
The Stability ◽  
Moisture Conditions ◽  
High Temperature Drying

Abstract The resinous impregnant in glass yarn influences the stability of the yarn. Some glass yarns suffer tensile degradation on storage and/or vulcanization at high humidities. One type of glass yarn was exposed in atmospheres over the range 0–88% relative humidity at 73° F for times up to 400 days. Tensile losses of 30% or more can occur on storage of the glass yarn at the humidities in the upper end of the range. This loss is permanent as even vigorous drying at high temperatures will not restore the tensile. Under dry conditions the yarn has excellent storage stability. Furthermore, after vulcanization even into thin composites, the glass yarn shows only a small permanent loss of tensile under moisture conditions that would seriously degrade the yarn in a package. An increased degree of vulcanization of the rubber slightly increases the tensile strength of the composite. In addition to its permanent degradative action in long-term exposure, water has a phenomenological effect of reducing glass composite tensile by its presence. A tensile sensitivity to moisture index is suggested and used to characterize the glass yarn. This tensile loss is recoverable by drying but some of the water is bound very tightly. Thin composites do not give up all of the water in 150 days over Drierite® as shown by the fact that more vigorous high temperature drying leads to a further increase in tensile strength. Tensile strength at 300° F is about 25% lower than at 73° F at any moisture content. Higher moisture contents lead to lower absolute tensiles. Tensile values are detailed for conditions that might exist during cure or in a product running at a high temperature. The high temperature incurred tensile reductions from a standard tensile are significant and should be considered in designing products. The detailed observations apply only to this particular glass yarn but the principles and methods are applicable in the evaluation or development of any glass yarn.

Biomechanical tensile strength analysis for medial patellofemoral ligament reconstruction

The Knee ◽  
2017 ◽  
Vol 24 (5) ◽  
pp. 965-976 ◽  
Author(s):  
Patrick W. Joyner ◽  
Jeremy Bruce ◽  
Travis S. Roth ◽  
Frederic Baker Mills ◽  
Scott Winnier ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ligament Reconstruction ◽  
Medial Patellofemoral Ligament ◽  
Strength Analysis ◽  
Medial Patellofemoral Ligament Reconstruction

scholarly journals Characterisation of poly(vinyl alcohol)- polycaprolactone hybridized scaffold for potential skin tissue regeneration

2020 ◽  
Vol 16 (1) ◽  
pp. 6-9
Author(s):  
Tan Yong Chee ◽  
Abdull Rahim Mohd Yusoff ◽  
Nik Ahmad Nizam Nik Malek
Keyword(s):  
Molecular Weight ◽  
Contact Angle ◽  
Tensile Strength ◽  
Tissue Regeneration ◽  
Vinyl Alcohol ◽  
Skin Tissue ◽  
Poly Vinyl Alcohol ◽  
Strength Analysis ◽  
Hydrophilic Polymer ◽  
Hydrophobic Polymer

The fabrication of a hybridized scaffold constituting hydrophobic and hydrophilic polymers for tissue engineering has received an increasing attention recently. Due to the high compatibility with water, a hydrophilic polymer, though is able to enhance cell affinity and proliferation, has a very high biodegradable rate and low stability in aqueous medium that eventually puncture its biomedical applications. Thereby, the addition of a hydrophobic polymer in the hydrophilic polymer scaffold is recommended to increase the hydrophobic property of the scaffold in order to reduce the limitation. Nonetheless, the fabrication of the hybridized scaffold is extremely challenging because the hydrophilic and the hydrophobic polymer tends to dissolve in different types of solvents, i.e. water and organic solvent, respectively, that subsequently restricts their blending process. In this work, a poly(vinyl alcohol) (PVA) scaffold, a polycaprolactone (PCL) scaffold, and their hybridized scaffold were produced through casting method for potential skin tissue regeneration. We found that the glacial acetic acid was an appropriate solvent used to prepare hydrophobic PCL solution with low molecular weight (16 kDa) for PCL-PVA blend, with mass ratio 1:1, without using any surfactant. The solvent was also used for the preparation of PCL scaffold with high molecular weight (80 kDa). The fabricated polymer scaffolds were then evaluated using FTIR-ATR, contact angle measurement, and tensile strength analysis. FESEM images of the PVA-PCL hybridized scaffold showed that the PCL was well dispersed in the PVA scaffold. FTIR-ATR spectra showed that the hybridized scaffold exhibited the crucial functional group of PVA and PCL at 3310.97, 1720.10, 1557.80, 1241.69, 1172.90, 1044.95, and 719.44 cm-1. The contact angle of the PVA, PCL, and PVA-PCL hybridized scaffold were 61.3o, 82.7o, and 75.9o, respectively, with tensile strength 16.5747, 2.4038, and 7.417 MPa, respectively.

scholarly journals Synthesis and Deblocking Investigations of Phenol Blocked Aliphatic Isocyanates and Their Application in the Development of Epoxy-Polyurethane Films

2022 ◽  
Vol 34 (2) ◽  
pp. 361-370
Author(s):  
Karthi Rajendran ◽  
Vennila Srinivasan ◽  
Sankar Govindarajan
Keyword(s):  
Tensile Strength ◽  
Mechanical Characteristics ◽  
13C Nmr Spectroscopy ◽  
Strength Analysis ◽  
Co2 Evolution ◽  
Structure Property ◽  
Gel Time ◽  
Solubility Study ◽  
Time Period ◽  
Atr Spectroscopy

Phenol blocked hexamethylenediisocyanate adducts and polyisocyanates were synthesized and their structure was validated by FTIR, 1H & 13C NMR spectroscopy, TGA, DSC and CO2 evolution techniques were used to evaluate the deblocking temperature of blocked isocyanates. Gel time studies of blocked isocyanates with terathane polyol and solubility study of blocked isocyanates with different polyols were conducted to demonstrate the structure-property correlation. Epoxy-polyurethane films were produced utilizing the blocked isocyanates reported in this work with epoxy resin and their structure was verified by ATR Spectroscopy. TGA, DSC, shore A hardness, tensile strength and flexural strength analysis were used to investigate the thermal and mechanical characteristics of these films. The findings of deblocking temperature and gel time revealed that unsubstituted phenol blocked isocyanates and polyisocyanates deblock at lower temperatures and cure for a shorter time period than substituted phenol blocked isocyanates. Thermal and mechanical characteristics of epoxy-polyurethane films based on blocked polyisocyanates are satisfactory.

Strengthening of Reinforced Concrete Beams Using Bamboo Fiber/Epoxy Composite Plates in Flexure

2019 ◽  
Vol 821 ◽  
pp. 465-471 ◽  
Author(s):  
Siew Choo Chin ◽  
Jacky Neing Sheng Moh ◽  
Shu Ing Doh ◽  
Fadzil Mat Yahaya ◽  
Jolius Gimbun
Keyword(s):  
Tensile Strength ◽  
Reinforced Concrete ◽  
Composite Plate ◽  
Natural Fiber ◽  
Fiber Composite ◽  
Composite Plates ◽  
Bamboo Fiber ◽  
Reinforced Concrete Beams ◽  
Bending Test ◽  
Rc Beams

Fiber reinforced polymer (FRP) is widely used in the construction industry for structural strengthening due to their outstanding mechanical properties. However, the production of synthetic fibers such as FRP is detrimental to the environment. Alternatively, natural fiber composite may be used as external strengthening material. This paper presents the potential of bamboo fiber composite plate (BFCP) to strengthen the reinforced concrete (RC) beams in flexure. The bamboo of species Dendrocalamus asper was used to produce the fiber and fiber-to-volume ratio was set at 2:5. The composite plate was fabricated by binding bamboo fibers with epoxy using a hand-lay-up method. The flexural and tensile strength of the BFCP was measured and all the beams were tested to failure under four-point bending test. It was found that BFCP exhibited a higher flexural and tensile strength compared to pure epoxy samples. Meanwhile, the RC beams strengthened using BFCP exhibited an increment of 10-12% in beam structural capacity compared to the un-strengthened beams. Bonding of BFCP in the flexure zone was able to divert the vertical cracks into diagonal at the edge of the composite plate. Findings from this work may serve as a useful guide to strengthen RC beams using a BFCP.

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