scholarly journals Effects of Aging Temperature on Moisture Absorption of Perforated GFRP

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Shiva Eslami ◽  
Fathollah Taheri-Behrooz ◽  
Farid Taheri
Keyword(s):  
Aging Temperature ◽  
Moisture Absorption ◽  
Flexural Stiffness ◽  
Sem Images ◽  
Glass Fiber Reinforced ◽  
Semiempirical Equation ◽  
Bending Capacity ◽  
Composite Configuration ◽  
Effects Of Aging ◽  
Bending Loading

This paper examines the effects of aging on the flexural stiffness and bending loading capacity of a perforated glass fiber-reinforced epoxy composite subjected to combined moisture and elevated temperature. Specimens, in the configuration of one-quarter of a perforated GFRP tube, were aged in 60% humidity and temperatures of 40, 60, and 80°C, respectively. Moisture absorptions of the specimens were measured during the aging process, and bending tests were conducted on the specimens after aging. The SEM images were also captured to further examine the effects of the moisture absorption on the aged specimens. The results indicated that the increase in the aging temperature reduced the diffusion coefficient, thus inducing more moisture absorption by the composite and in turn causing more reduction in composite’s flexural stiffness and bending capacity. Moreover, the ability of Fick’s equation for predicting the moisture absorption rate in such perforated thin-walled composite configuration at various moisture contents and temperatures was also assessed. A semiempirical equation was developed and proposed by which the reduction of the stiffness in the perforated aged GFRP structures could be predicted.

scholarly journals Enhancing Strength of Bamboo using GFRP and PU

2020 ◽  
Vol 11 (3) ◽  
Author(s):  
Teoh Hui Xin ◽  
◽  
Norazman Mohamad Nor ◽  
Mohammed Alias Yusof ◽  
◽  
...  
Keyword(s):  
Glass Fiber ◽  
Bending Strength ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced Polymer ◽  
Bearing Strength ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Bending Capacity ◽  
Work Done

Bamboo is an eco-friendly material, it can be used in various applications such as bamboo housing, bamboo bridges, bamboo scaffolding, ply bamboo, bamboo furniture, and for defence applications. It has various advantages to be used as structural material. However, it has weaknesses such as crushing failure under extreme loading that need to be addressed. The objective of this research is to enhance bamboo bearing and bending capacity using various stiffeners. Experimental work done is to investigate the compressive strength, bending strength, bearing strength and tensile strength of raw local bamboo. Further analysis includes bending and bearing strength of raw bamboo and strengthen bamboo using Glass Fiber Reinforced Polymer (GFRP) and Polyurethane (PU) Foams. From the test done, the bearing strength of raw bamboo Semantan with node is between 2.61 MPa to 3.14 MPa and for raw bamboo Semantan without node is between 0.28 MPa to 0.82 MPa, average bending strength of raw bamboo Semantan is 59 MPa. For strengthen bamboo with 4 layers of Glass Fiber Reinforced Polymer, the bearing strength without node is between 1.59 MPa to 2.38 MPa, and the average bending strength is 62 MPa which is about 5% higher than raw bamboo.

Experimental Study on Flexural Performances of Concrete Beams Strengthened with Near-Surface Mounted (NSM) FRP Reinforcement

2010 ◽  
Vol 163-167 ◽  
pp. 3634-3639
Author(s):  
Li Li Sui ◽  
Tie Jun Liu ◽  
Feng Xing ◽  
Yu Xiang Fu
Keyword(s):  
Experimental Study ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Flexural Stiffness ◽  
Test Results ◽  
Near Surface ◽  
Bending Performance ◽  
Bending Capacity ◽  
Frp Reinforcement ◽  
Near Surface Mounted

This paper illustrates the results of an experimental study on the bending performance of concrete beams strengthened with near-surface mounted (NSM) FRP reinforcement. The critical parameter of the embedded length of NSM-FRP plates was investigated in particularly. The test results indicated that NSM-FRP reinforcement can significantly improve the strength and crack resistance capacity of the concrete beam, reducing the size of cracks. The embedded length of the NSM-FRP plate has distinct influence on the cracking and bending capacity, the flexural stiffness, and the crack developments of the concrete beam. As the embedded length increased, the bending capacity and the flexural stiffness increased correspondingly and the crack developed more intensively.

Reversibility of uranium and thorium binding on a modified bauxite refinery residue: The effects of aging temperature

2015 ◽  
Vol 53 ◽  
pp. 79-90 ◽  
Author(s):  
M.W. Clark ◽  
T.E. Payne ◽  
J.J. Harrison ◽  
M.J. Comarmond ◽  
R.N. Collins ◽  
...  
Keyword(s):  
Aging Temperature ◽  
Effects Of Aging

Effects of aging temperature on microstructural evolution at dissimilar metal weld interfaces

2015 ◽  
Vol 462 ◽  
pp. 54-63 ◽  
Author(s):  
Kyoung Joon Choi ◽  
Seung Chang Yoo ◽  
Taeho Kim ◽  
Chi Bum Bahn ◽  
Ji Hyun Kim
Keyword(s):  
Microstructural Evolution ◽  
Aging Temperature ◽  
Dissimilar Metal ◽  
Dissimilar Metal Weld ◽  
Effects Of Aging ◽  
Metal Weld

Effect of Ageing Process on Mechanical Properties of Martensite Precipitation-Hardening Stainless Steel

2010 ◽  
Vol 146-147 ◽  
pp. 382-385 ◽  
Author(s):  
Song Xiang ◽  
Jiang Ping Wang ◽  
Yu Ling Sun ◽  
Yong You Yan ◽  
Shi Gang Huang
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Brittle Fracture ◽  
Fracture Mode ◽  
Aging Temperature ◽  
Aging Process ◽  
Precipitation Hardening ◽  
Ageing Process ◽  
Tempered Martensite ◽  
Effects Of Aging

17-4PH precipitation-hardening martensite stainless steel is an important commercially available stainless steel. And the mechanical properties of this steel are very sensitive to quenching and aging process. In this paper, the effects of aging process on mechanical properties of this steel were investigated. The results show that the microstructure of this steel consists of quenched martensite, tempered martensite and precipitates. With the increase of the aging temperature, the strength decreases and the toughness increase. And the fracture mode of this steel transforms brittle fracture into toughness fracture.

Effects of Aging Temperature on the Formation of Secondary Defects in Quenched α-Brass

1978 ◽  
Vol 17 (9) ◽  
pp. 1467-1471
Author(s):  
Hiroyuki Yamaguchi ◽  
Hiroshi Yamada ◽  
Sho Yoshida
Keyword(s):  
Aging Temperature ◽  
Effects Of Aging

The Effects of Aging Temperature and Air-Fuel Ratio on the NOx Storage Capacity of a Lean NOx Trap

2004 ◽  
Author(s):  
Joseph R. Theis ◽  
Justin A. Ura ◽  
George W. Graham ◽  
Hung-Wen Jen ◽  
John J. Li ◽  
...  
Keyword(s):  
Aging Temperature ◽  
Storage Capacity ◽  
Nox Storage ◽  
Lean Nox Trap ◽  
Nox Trap ◽  
Fuel Ratio ◽  
Nox Storage Capacity ◽  
Lean Nox ◽  
Effects Of Aging

Moisture Deterioration Mechanism of Fiber Reinforced Composites

2013 ◽  
Vol 750-752 ◽  
pp. 176-185
Author(s):  
Yun Hae Kim ◽  
Jun Mu Park ◽  
Jin Woo Lee ◽  
Jae Hyun Jeong ◽  
Kyung Man Moon
Keyword(s):  
Carbon Fiber ◽  
Glass Fiber ◽  
Recovery Rate ◽  
Moisture Absorption ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Drying Process ◽  
Glass Fiber Reinforced ◽  
Carbon Fiber Reinforced

Generally, the moisture absorbed in the composites plasticizes the resin. And it makes the composites expansion in volume and generates the cracking at the same time, So, the fracture is often generated in the composites by those reason. Therefore, in this study, the change of mechanical properties due to the moisture-absorption for the carbon fiber reinforced composites in comparison with basalt fiber and glass fiber reinforced composites are investigated. The specimens for the carbon, basalt, and glass fiber reinforced composites manufactured with the ASTM standard. The specimens immersed in distilled water at 80°C during 100 days and the coefficient of moisture was measured in according to the Fick's law. In addition, after drying process, the humidity-absorbed specimen under 80°C for 1 day, the recovery rate was measured. As a result, the coefficient of moisture-absorption of carbon fiber reinforced composite material was the lowest at approximately 3 % because the interface coherence with the fiber and resin are the most strong. Also, after drying process, the recovery rate was 20 percent higher than the others.

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