scholarly journals Pengaruh Variasi Bio Based Adhesive terhadap Kekuatan Peeling dan Shearing Kayu Pinus pada Adhesive Joint

2021 ◽  
Vol 12 (2) ◽  
pp. 251-257
Author(s):  
Mochammad Syamsul Ma’arif ◽  
◽  
Muhammad Fadlurahman ◽  
Khairul Anam
Keyword(s):  
Adhesive Strength ◽  
Test Specimen ◽  
Rubber Tree ◽  
Environmentally Friendly ◽  
Fracture Analysis ◽  
Natural Sources ◽  
Peeling Strength ◽  
Tree Sap ◽  
Shearing Strength ◽  
Synthetic Adhesives

The methods of joining engineering materials using adhesives is mostly implemented by using synthetic adhesives from non-renewable sources. Even though it has good joining performance, its poisonous nature and difficult to decompose naturally makes the adhesive needs to seek alternatives that are more environmentally friendly. Another reason is to support FAO campaigns for the use of environmentally friendly and biodegradable materials. One that has the potential to replace synthetic one is adhesives from natural sources such as gum rubber, jackfruit, and breadfruit. Because each natural sap has a different composition, the adhesive strength will also be different. Therefore it is necessary to examine the adhesive strength of each of these natural gums. In this research, natural adhesives (gums) and synthetic adhesives were used to joint pine wood as a test specimen. After joining, peeling and shearing tests on the specimens were carried out so that the mechanical strength of the joints for each adhesive variation was recognized. Fracture analysis was then performed to analyze the mechanism of joint failure for each adhesive variation. From this research, the highest peeling strength was obtained from rubber tree sap of 0.15 MPa, while the highest shearing strength was also obtained for rubber sap of 0.68 MPa.

Bonding Parameters of Anisotropic Conductive Adhesive Film and Peeling Strength

2005 ◽  
Vol 297-300 ◽  
pp. 918-926 ◽  
Author(s):  
Xu Chen ◽  
Jun Zhang ◽  
Chunlei Jiao ◽  
Yan Min Liu
Keyword(s):  
High Temperature ◽  
Adhesive Strength ◽  
Bonding Temperature ◽  
Curing Time ◽  
Post Processing ◽  
Bonding Pressure ◽  
Adhesive Film ◽  
Bonding Parameters ◽  
Anisotropic Conductive Adhesive ◽  
Peeling Strength

The effects of different bonding parameters-temperature, pressure, curing time, bonding temperature ramp and post-processing on the adhesive strengths of Anisotropic Conductive Adhesive Film (ACF) interconnection were investigated. The test results showed the adhesive strength increased as the bonding temperature increase. The curing time had great influence on the adhesive strength of ACF joints. The adhesive strengths increased as the bonding pressure increasing, but decreased if the bonding pressure was over 0.25MPa. The effects of different Teflon thickness on the pressure header and post-processing on adhesive strengths performance of ACF joints were studied. It was shown that the 90o peeling strength became deteriorated as the Teflon thickness increase. Different post-processing conditions showed that the specimens kept in 120oC chamber for 30 minutes had the best performance of the ACF interconnection. The environmental experiments of the thermal cycling (-40 - 125oC) and the high temperature/humidity (85oC, 85%RH) aging were used to evaluate the reliability of the specimens with different bonding parameters. It was shown that the high temperature/humidity was the harshest condition to the ACF bonding. The optimum bonding parameters were determined to obtain better peeling strength.

Three-level hierarchal modeling of gecko toe adhesion

2008 ◽  
Vol 1132 ◽  
Author(s):  
B. Chen ◽  
P. D. Wu ◽  
H. Gao
Keyword(s):  
Body Weight ◽  
Adhesive Strength ◽  
Adhesion Energy ◽  
Intermediate Level ◽  
The Other ◽  
Other Hand ◽  
Peeling Strength ◽  
Underlying Mechanisms ◽  
Gecko Adhesion

ABSTRACTThe underlying mechanisms of gecko adhesion have been investigated through modeling of the three-level hierarchical microstructures under gecko's toe [1]. At the bottom of hierarchy, we show that the peeling strength of a spatula pad for attachment can be 10 times larger than that for detachment. At the intermediate level of hierarchy, we show that the 10 times difference in the peeling strength of a spatula pad for attachment and detachment leads to a 100 times difference in adhesion energy at the level of seta. At the top of hierarchy, the attachment of a gecko toe is modeled as a pad under displacement controlled pulling, which yields an adhesive strength more than sufficient for gecko's body weight; On the other hand, the detachment is modeled as a pad under peeling, giving rise to a negligible peel-off force. The present study reveals that the hierarchical microstructures play critical roles in providing gecko with robust attachment and easy detachment.

scholarly journals Environmentally Friendly Methods for Flavonoid Extraction from Plant Material: Impact of Their Operating Conditions on Yield and Antioxidant Properties

2020 ◽  
Vol 2020 ◽  
pp. 1-38 ◽  
Author(s):  
Sara Luisa Rodríguez De Luna ◽  
R. E. Ramírez-Garza ◽  
Sergio O. Serna Saldívar
Keyword(s):  
Antioxidant Properties ◽  
Environmentally Friendly ◽  
Natural Antioxidants ◽  
Extraction Process ◽  
Operating Conditions ◽  
Plant Resources ◽  
Natural Sources ◽  
Operation Conditions ◽  
Kinetic Mechanisms ◽  
High Yields

The flavonoids are compounds synthesized by plants, and they have properties such as antioxidant, anticancer, anti-inflammatory, and antibacterial, among others. One of the most important bioactive properties of flavonoids is their antioxidant effect. Synthetic antioxidants have side toxic effects whilst natural antioxidants, such as flavonoids from natural sources, have relatively low toxicity. Therefore, it is important to incorporate flavonoids derived from natural sources in several products such as foods, cosmetics, and drugs. For this reason, there is currently a need to extract flavonoids from plant resources. In this review are described the most important parameters involved in the extraction of flavonoids by unconventional methods such as ultrasound, pressurized liquid extraction, mechanochemical, high hydrostatic pressure, supercritical fluid, negative pressure cavitation, intensification of vaporization by decompression to the vacuum, microwave, infrared, pulsed electric field, high-voltage electrical discharges, and enzyme-assisted extraction. There are no unified operation conditions to achieve high yields and purity. Notwithstanding, progress has been achieved in the development of more advanced and environmentally friendly methods of extraction. Although in literature are found important advances, a complete understanding of the extraction process in each of the unconventional techniques is needed to determine the thermodynamic and kinetic mechanisms that govern each of the techniques.

CuCO3–CuO nanocomposite as a novel and environmentally friendly catalyst for triazole synthesis

RSC Advances ◽  
2015 ◽  
Vol 5 (113) ◽  
pp. 93438-93446 ◽  
Author(s):  
Halima Hadj Mokhtar ◽  
Bouhadjar Boukoussa ◽  
Rachida Hamacha ◽  
Abdelkader Bengueddach ◽  
Douniazad El Abed
Keyword(s):  
Low Cost ◽  
Environmentally Friendly ◽  
Natural Sources

This paper focuses on the use of natural sources for the preparation of efficient and low cost catalysts for triazole synthesis.

Development of Green Engineered Cementitious Composites

2014 ◽  
Vol 1020 ◽  
pp. 3-8 ◽  
Author(s):  
Marek Jašek ◽  
Jiri Brozovsky ◽  
Lucie Mynarzová ◽  
Jan Hurta
Keyword(s):  
Fly Ash ◽  
Environmentally Friendly ◽  
Cost Effective ◽  
Partial Replacement ◽  
Cement Composites ◽  
Green Composites ◽  
Cementitious Composite ◽  
Fly Ashes ◽  
Natural Sources ◽  
Green Materials

A development of fiber-cement composites is often focused on cost-effective and environmentally friendly materials (so-called green materials). Production of this material should produce less waste and it also should use less energy and less natural sources. There are numerous approaches to the development of green composites. One of the possible ways is a utilization of fly ashes instead of the cement part of composite. The paper discusses a development of green cementitious composite which incorporated fly ash materials produced in the Moravian-Silesian region as a partial replacement of the cement part of the composite.

scholarly journals A Study on the Shearing Strength and Adhesive Strength of Sea Ice

1997 ◽  
Vol 13 ◽  
pp. 765-770
Author(s):  
Hisao Matsushita ◽  
Toru Takawaki ◽  
Takahiro Takeuchi ◽  
Masafumi Sakai ◽  
Takashi Terashima ◽  
...  
Keyword(s):  
Sea Ice ◽  
Adhesive Strength ◽  
Shearing Strength

Research on Waterproof-Adhesive Layer’s Shearing Strength in Cement Concrete Bridge Pavement

2009 ◽  
Vol 417-418 ◽  
pp. 849-852
Author(s):  
Shao Peng Wu ◽  
Hong Wang ◽  
Jun Han ◽  
Jun Tao Lin
Keyword(s):  
Adhesive Strength ◽  
Asphalt Pavement ◽  
Adhesive Layer ◽  
Power Exponent ◽  
Concrete Bridge ◽  
Cement Concrete ◽  
Shearing Strength ◽  
Reliable Design ◽  
The Relationship ◽  
Concrete Deck

The waterproof-adhesive layer plays an important role in cement concrete bridge pavement. The adhesive strength of the layer between the cement concrete deck and the asphalt pavement may affect the bridge’s service performance directly. In the study, the direct shearing-strength experiment between the asphalt pavement, waterproof adhesive layer and the cement concrete deck was done in a laboratory. Some testing parameters were considered, including different loading speed, surface processing mode of the cement concrete deck and adhesive materials. The result shows that the coarser the surface of the cement concrete deck is, the larger the shearing strength of the adhesive material is at the same temperature. The loading speed of the shearing test has important effect on the shearing strength. The rapid loading speed can cause high shearing strength. Especially, the experiment datum indicates that the relationship between the loading speed of the test and the shearing strength can be described using the power exponent. Ultimately, the study is aimed at providing bridge engineers with an efficient testing method that attempts to increase the prediction accuracy of adhesive strength for more reliable design.

Detection and Test of Rind-Pith Adhesive Strength of Corn Stalks

2021 ◽  
Vol 37 (1) ◽  
pp. 149-156
Author(s):  
Wanyuan Huang ◽  
Yuanjuan Gong ◽  
Xuewei Bai
Keyword(s):  
Mathematical Model ◽  
Moisture Content ◽  
Influencing Factors ◽  
Adhesive Strength ◽  
Sampling Location ◽  
List Type ◽  
Single Factor ◽  
Simulation And Optimization ◽  
Peeling Strength ◽  
The Mathematical Model

HighlightsA detection clamp for the rind-pith adhesive strength of corn stalks based on peeling method was designed.A rind-pith adhesive strength detection method was proposed taking average peeling strength as the test index.The characteristics of rind-pith adhesive strength were analyzed, and a mathematical model between average peeling strength and influencing factors was established.Abstract. Rind-pith separation of corn stalks is one of the effective measures for realizing high-value utilization of stalks. Therefore, it is necessary to study rind-pith adhesive strength of stalks and its influencing factors to determine effective separation methods. In this study, a peeling method was put forward and single factor and multi-factor tests were carried out to explore the rind-pith adhesive strength. The analysis of single factor tests showed that sampling location, moisture content, and peeling speed were all significant on the average rind-pith peeling strength and the Fp = 25.70 > F0.05 (4, 20) = 2.87, Fm = 112.46 > F0.05 (4, 20) = 2.87 and Fs = 231.21 > F0.05 (6, 28) = 2.45. The mathematical model between average peeling strength and influencing factors was established through multi-factor tests. The model was analyzed and optimized, and the significance sequence of influencing factors is sampling location > moisture content > peeling speed, and the effect of interaction between moisture content and sampling location was significant (P<0.05). It can be concluded that the rind-pith peeling strengths of internode sections among 1st-7th internodes of corn stalks were 360.09-450.01 N/m, which are smaller and more favorable for mechanical separation for stalks with moisture content of 15%-20% and at peeling speed of 30-40 mm/min. The results of this study may provide a theoretical reference for the modeling of corn stalks and the subsequent simulation and optimization of rind-pith separation machines. Keywords: Average peeling strength, Adhesive strength, Corn stalks, Rind-pith Separation.

Interface Structure and Properties of Explosive Welded Beryllium Bronze/Steel Composite Plates

2011 ◽  
Vol 52-54 ◽  
pp. 1598-1602 ◽  
Author(s):  
Guo Shang Zhang ◽  
Shu Zeng Hou ◽  
Shi Zhong Wei ◽  
Ji Wen Li ◽  
Liu Jie Xu
Keyword(s):  
Experimental Studies ◽  
Welding Process ◽  
Composite Plates ◽  
Large Wave ◽  
Initiation Point ◽  
Beryllium Bronze ◽  
Peeling Strength ◽  
Shearing Strength ◽  
Strength Material ◽  
Steel Composite

In this study, beryllium bronze/steel composite plates were fabricated through explosive welding process using different ratios of explosive. Microstructures of the joint were examined, and then shearing strength, peeling strength, Bending tests and hardness measurements were carried out on the bonded specimens. Experimental studies show that, beryllium bronze and steel could be bonded with a good quality. The interface is wavy texture changing in turns from flat - wavelet - large wave - stable large wave beginning with initiation point. Grains near the interface are elongated parallel to the explosion direction. As the ratio of explosive increase, the amplitude and wavelength of wave are increased, which leads to the increasing of shearing strength and bonging strength. No shearing in the interface is seen from the tensile-shear tests and fracture take place in the low strength material. The bended specimens show that defects such as separation and tearing were not observed. Hardness is increased with increasing explosive ratio and the highest hardness values are obtained near the bonding interface.

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