XPS depth profile of plasma-activated surface of beech wood (Fagus sylvatica) and its impact on polyvinyl acetate tensile shear bond strength

Abstract Bond strength is one of the most important parameters and can affect the macroscopic mechanical properties and the damage state of the rock to some degree. The coarse-grained sandstone with strength of less than 40 MPa was studied by the controlled variable method. The influence of parallel bond strength on the peak strength and failure mode of coarse-grained sandstone was simulated, the evolution law of peak strength and failure mode of bond strength were comprehensively analyzed. The results show that the peak strength of rock was positively correlated with the bond strength, the difference value between tensile and shear crack was negatively correlated with tensile bond strength and positively correlated with shear bond strength. Tensile-shear bond strength ratio less than 0.5, the peak strength of the rock was usually stable at the certain extreme value under a constant tensile bond strength. Tensile crack was negatively correlated with the tensile-shear bond strength ratio, shear crack was positively correlated with the tensile-shear bond strength ratio. The failure mode of coarse-grained sandstone is shear failure. The research results can be used to guide the ground control of other mine stopes or roadways with weak cementation lithology.

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Tensile-Shear Bond Strength and Failure Between Aggregate and Mortar

Journal of Testing and Evaluation ◽

10.1520/jte10190j ◽

1976 ◽

Vol 4 (2) ◽

pp. 148 ◽

Cited By ~ 4

Author(s):

RL Meltzer ◽

YR Fiorini ◽

RT Horstman ◽

IC Moore ◽

AL Batik ◽

...

Keyword(s):

Bond Strength ◽

Shear Bond Strength ◽

Tensile Shear

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Pengaruh bahan bonding self-etch terhadap kekuatan perlekatan antara pasak glass fiber dengan resin komposit

Jurnal Material Kedokteran Gigi ◽

10.32793/jmkg.v1i1.153 ◽

2012 ◽

Vol 1 (1) ◽

pp. 1

Author(s):

Astrid Yudhit ◽

Rusfian Dayuni Ariski S

Keyword(s):

Bond Strength ◽

Glass Fiber ◽

Shear Bond Strength ◽

Resin Composite ◽

Testing Machine ◽

Bonding Agent ◽

Tensile Shear ◽

Fiber Post ◽

Glass Fiber Post ◽

Self Etch

Nowadays, glass fiber post and composite resin cores have been used in endodontic treatment for esthetics achievement. The success of this treatment was affected by some factors such as bond strength between post and cores. The aim of this study is to investigate the effect of self etch bonding agent that use as adhesive materials between glass fiber post and resin composite by its bond strength. Totally twenty samples is used in this study, and divided in two groups (n=10 for each group), bonding group agents and without bonding agent group (control). The tensile-shear bond strength tested with Universal Testing Machine. Then, the bond strength values were analyzed statistically with t-test (p≤ 0,05). The result shows that bonds strength values in bonding agent groups were higher than without bonding agent groups. But, there is no significantly different between groups. In conclusion, bonding agent did not have effect on tensile-shear bond strength between glass fiber post and resin composite.

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Bondability of Black locust (Robinia pseudoacacia) and Beech wood (Fagus sylvatica) with polyvinyl acetate and polyurethane adhesives

Maderas Ciencia y tecnología ◽

10.4067/s0718-221x2017005000008 ◽

2017 ◽

pp. 0-0 ◽

Cited By ~ 1

Author(s):

Kamperidou Vasiliki ◽

Barboutis Ioannis

Keyword(s):

Fagus Sylvatica ◽

Polyvinyl Acetate ◽

Black Locust ◽

Robinia Pseudoacacia ◽

Beech Wood ◽

Polyurethane Adhesives

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Effect of Sodium Hypochlorite in Ground Fluorotic Enamel: Shear Bond Strength and Surface Analysis

Odovtos - International Journal of Dental Sciences ◽

10.15517/ijds.2021.47574 ◽

2021 ◽

pp. 320-332

Author(s):

José Gilberto Roque-Márquez ◽

Norma Verónica Zavala-Alonso ◽

Nuria Patiño-Marín ◽

Gabriel Alejandro Martínez-Castañón

Keyword(s):

Bond Strength ◽

Depth Profile ◽

Shear Bond Strength ◽

High Speed ◽

Failure Modes ◽

Vickers Microhardness ◽

Intraclass Correlation ◽

Ground Enamel ◽

Diamond Bur ◽

Anterior Teeth

Evaluate the effect on the shear bond strength (SBS) of 5% NaOCl applied after acid etching on ground anterior teeth with fluorosis and analyze the surface with scanning electron microscopy (SEM), also compare fluorotic and healthy ground enamel by atomic force microscopy (AFM) and Vickers microhardness (VM). For the SBS test 30 anterior teeth with moderate and severe fluorosis according Dean index were selected by an examiner previously calibrated with an expert in fluorosis by using the intraclass correlation coefficient (ICC). With the help of a calibrated high speed diamond bur for veneer preparation and a parallel chamfer high speed diamond bur the vestibular face was prepared with a uniform reduction of .3 mm under water cooling. In one half of the vestibular face of the teeth the conventional adhesive procedure was carried out while in the other half was added an additional step with 5% NaOCl applied for 1 minute and washing after acid etchant. A resin post was adhered in each half and load was applied until fracture. The failure mode was evaluated and a SEM analysis was made. Posteriorly 10 samples of fluorotic and healthy ground enamel were used to measure the nanostructural characteristics by AFM (roughness average and absolute depth profile) and the VM in three operative steps (after ground, after etchant and after deproteinization). The Shapiro-Wilks and Brown-Forsythe methods were used to test the distribution of variables. The Paired Student's t-test was used to compare the differences between mean bond strength (MPa) in the two groups for SBS test. Chi-square analyzes were performed to compare the failure modes between groups. One-way ANOVA analysis and Tukey-Kramer post hoc test were used to compare groups for roughness average, absolute depth profile and Vickers microhardness. A greater SBS (32.17±4.20 MPa) and a surface more homogeneous and less contaminated were observed in the deproteinization subgruoup compared to the conventional subgroup (27.74±4.88 MPa). AFM parameters were greater in fluorosis subgroup than in healthy enamel subgroup. VM was lower in the fluorotic enamel in each operative step in comparation with healthy enamel. The use of 5% NaOCl as a deproteinizing agent after acid etchant in ground fluorotic enamel results in better adhesion, which may imply greater success in adhesive treatments. The ground surface of fluorotic enamel shows higher values of roughness and depth and lower values of VM which proves that there is a more irregular and less hard surface.

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Study on the Effect of Bond Strength on the Failure Mode of Coarse-Grained Sandstone in Weakly Cemented Stratum

Minerals ◽

10.3390/min12010055 ◽

2021 ◽

Vol 12 (1) ◽

pp. 55

Author(s):

Xianda Yang ◽

Lihui Sun ◽

Jiale Song ◽

Bensheng Yang ◽

Chengren Lan ◽

...

Keyword(s):

Bond Strength ◽

Failure Mode ◽

Shear Bond Strength ◽

Shear Failure ◽

Peak Strength ◽

Tensile Bond Strength ◽

Coarse Grained ◽

Strength Ratio ◽

Shear Cracks ◽

Tensile Shear

Bond strength is one of the most important parameters and can affect the macroscopic mechanical properties and the damage state of rock to some degree. Coarse-grained sandstone was studied using the controlled variable method. The influence of parallel bond strength on the peak strength and failure mode of coarse-grained sandstone was simulated, and the evolution law of peak strength and the failure mode of bond strength were comprehensively analyzed. The results show that the peak strength of the rock was positively correlated with the bond strength; the difference in quantity between the tensile and shear cracks was negatively correlated with tensile bond strength and positively correlated with shear bond strength. With a tensile-shear bond strength ratio of less than 0.5, the peak strength of the rock was usually stable at the certain extreme value under a constant tensile bond strength. The tensile cracks were negatively correlated with the tensile-shear bond strength ratio, and the shear cracks were positively correlated with the tensile-shear bond strength ratio. The main failure mode of the coarse-grained sandstone in the weakly cemented stratum of the Hongqinghe coal mine is shear failure. The research results can be used to guide the ground control of other mine stopes or roadways with weak cementation lithology.

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