scholarly journals SLIP COEFFICIENT FOR HIGH-STRENGTH BOLTED FRICTIONAL JOINTS WITH ROUGHENED STEEL SURFACE AND INORGANIC ZINC-RICH PAINTED SURFACE

2015 ◽  
Vol 3 (1) ◽  
pp. 19-32 ◽  
Author(s):  
Yoshio TAMBA ◽  
Shinya YUKITO ◽  
Satoshi KIMURA ◽  
Takashi YAMAGUCHI ◽  
Kunitomo SUGIURA
Keyword(s):  
Steel Surface ◽  
High Strength ◽  
Slip Coefficient ◽  
Painted Surface ◽  
Frictional Joints

Processing strategy for high strength Ni-based hybrid composite clad on SS 316L steel through microwave heating

2021 ◽  
pp. 095440542110213
Author(s):  
Sarbjeet Kaushal ◽  
Satnam Singh ◽  
Dheeraj Gupta
Keyword(s):  
Sliding Wear ◽  
Steel Surface ◽  
Steel Substrate ◽  
Microstructural Analysis ◽  
High Strength ◽  
Phase Changes ◽  
Microwave Exposure ◽  
Pull Out ◽  
316L Steel ◽  
Microwave Applicator

Processing of nickel-based high strength composites and alloys is a difficult and thought-provoking task. In this work, a strategy of heating through microwaves radiation is utilized to process the high strength hybrid Ni-based composite clad on SS 316L steel surface containing 15% (WC-8Co) and 5% Mo. The premixed composite powder was placed on the steel surface and irradiated with domestic microwave applicator having 2.45 GHz fixed frequency and 900 W power. The hybrid clad was successfully developed within 12–15 min of microwave exposure. The processed clad was subjected to various metallurgical and mechanical characterizations to understand the microstructures and phase changes. Microstructural analysis study revealed that the clad of ∼0.85 mm thickness was obtained and presence of dispersed reinforced particles of WC-8Co and Mo in nickel matrix were observed. Some inter-metallic phases of W2C, Ni2Mo4C, Ni4W and NiSi2 were observed in the clad. The average microhardness of the composite clad was712 ± 58 HV. The microwave processed clad exhibited a flexural strength of 852 ± 6 MPa with deformation index of 35 × 10−5 mm/N. Further, the sliding wear study revealed that the sliding velocity of 1.0 m/s favoured the formation of oxide tribo layers. The various mechanisms of wear revealed by the analysis of worn-out surfaces were abrasion, adhesion, surface pull-out and deformation of surfaces. The microwave processed clad revealed significant improvement in wear resistance in comparison to the steel substrate.

Exploration of novel faying surface treatment for high-strength frictional bolted joints to enhance its after-slip performance

2021 ◽  
Author(s):  
Hitoshi Moriyama ◽  
Ryo Sakura ◽  
Takashi Yamaguchi ◽  
Takai Toshikazu ◽  
Yuta Yamamoto
Keyword(s):  
Surface Treatment ◽  
Load Transfer ◽  
High Strength ◽  
Bolted Joints ◽  
Deformation Capacity ◽  
Slip Coefficient ◽  
Faying Surface ◽  
Treatment Concepts ◽  
Local Slip

<p>Welded joints is adopted rather than bolted joints for megastructure’s connections because the former can carry large force. However, the former has several problems, such as quality control of welding in situ, which the latter can solve. By contrast, as the load transfer ratio of each bolt becomes uneven proportionally to the number of bolts, local slip around extreme bolts occurs before the whole slip. Extreme bolts to which a large shear force is applied will break before other bolts. For utilizing the strength of all bolts, the problem is solved by improving shear deformation capacity in faying surface with novel surface treatment. Here, the treatment concepts were explored, and the coating’s effectiveness was evaluated through friction tests. The deformation capacity can be twice or more than that of conventional treatment, and the slip coefficient doesn’t depend on contact pressure. These features have the advantage to give stable slip behaviour.</p>

Elimination of Rusting Layer from High-Strength Steel Surface Using Different Laser Cleaning Methods

2019 ◽  
Vol 46 (7) ◽  
pp. 0702003
Author(s):  
雷正龙 Zhenglong Lei ◽  
孙浩然 Haoran Sun ◽  
陈彦宾 Yanbin Chen ◽  
田泽 Ze Tian
Keyword(s):  
High Strength Steel ◽  
Steel Surface ◽  
High Strength ◽  
Laser Cleaning ◽  
Cleaning Methods

EXPERIMENTAL STUDY ON SLIP COEFFICIENT OF HIGH STRENGTH BOLTED JOINT WITH METAL SPRAYED CONTACT SURFACE

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Yusuke Nakanishi ◽  
Kunitaro Hashimoto ◽  
Yasuo Suzuki ◽  
Kunitomo Sugiura
Keyword(s):  
Steel Structures ◽  
High Strength ◽  
Treatment Method ◽  
Construction Cost ◽  
Bolted Joints ◽  
Maintenance Cost ◽  
Bolted Joint ◽  
Slip Coefficient ◽  
Surface Conditions ◽  
Contact Surfaces

There are several ways to reduce the number of bolts of frictional bolted joints from the viewpoint of the construction cost and the maintenance cost for steel structures. For example, there are the ways which are strengthening the material of bolts, or increasing the slip coefficient. This study is focused on the slip coefficient with metal thermal sprayed contact surfaces. The objective of this study is to investigate the effects of different surface conditions on the slip coefficient. Therefore, slip tests were conducted in consideration of 9 patterns of surface treatment method (3 kinds of thickness, 3 kinds of material of sprayed metal).

Experimental study on mechanical behavior of combined joint using adhesives and high strength bolts

2021 ◽  
Author(s):  
Takuya Kamino ◽  
Takashi Fujimoto ◽  
Takashi Yamaguchi ◽  
Yasumoto Aoki ◽  
Shinsuke Akamatsu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Design Method ◽  
High Strength ◽  
Corrosion Damage ◽  
Epoxy Adhesive ◽  
Steel Bridge ◽  
Slip Coefficient ◽  
Constraint Effect ◽  
Slip Resistance

<p>As a repair for corrosion damage of a steel bridge, a patch plate-repair using high strength bolts is generally applied. This method requires the surface of the damaged corroded part filled with an epoxy adhesive flat. The load transferring mechanism and slip resistance of such a combined joint with adhesives and high strength frictional bolts aren't clear. Since the shear strength of an adhesive might be increased due to constraint by the bolt axial force, the combined joint's slip resistance would be increased. To clarify the mechanical properties of the combined joint and to propose a new design method for such joints, two experiments have been conducted. The first was a frictional force experiment for adhesive specimens subjected to contact pressure on the surface to evaluate the constraint effect of adhesive on shear strength quantitatively. The last one is a slippage experiment for the combined joints to evaluate its slip coefficient.</p>

Evaluation of slip coefficient of slip critical joints with high strength bolts

2009 ◽  
Vol 32 (4) ◽  
pp. 477-488 ◽  
Author(s):  
Hwan-Seon Nah ◽  
Hyeon-Ju Lee ◽  
Kang-Seok Kim ◽  
Woo-Bum Kim
Keyword(s):  
High Strength ◽  
Slip Coefficient
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