scholarly journals A STUDY ON INITIAL BOLT PRETENSIONS OF HIGH STRENGTH BOLTED JOINTS CONSIDERING NUMBER OF CONTACT SURFACES

2019 ◽  
Vol 75 (1) ◽  
pp. 46-57
Author(s):  
Kuniaki MINAMI ◽  
Hiroshi TAMURA ◽  
Natsuki YOSHIOKA ◽  
Daisuke UCHIDA ◽  
Makoto MORO ◽  
...  
Keyword(s):  
High Strength ◽  
Bolted Joints ◽  
Contact Surfaces

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).

SLIPPING BEHAVIOR OF HIGH STRENGTH BOLTED JOINTS INCLUDING DIFFERENT CONTACT SURFACES

2020 ◽  
Vol 76 (2) ◽  
pp. 331-342
Author(s):  
Kohei TSUTSUI ◽  
Kuniaki MINAMI ◽  
Hideki YOKOYAMA ◽  
Takafumi AMANO ◽  
Hiroshi TAMURA
Keyword(s):  
High Strength ◽  
Bolted Joints ◽  
Contact Surfaces

scholarly journals Stress-strain connection analysis of bolted joints for thin-walled steel profiles working in tension and compression

2020 ◽  
Vol 164 ◽  
pp. 02007
Author(s):  
Evgeniy Ustimenko ◽  
Sergey Skachkov ◽  
Elena Vinogradova ◽  
Genrikh Muro
Keyword(s):  
Friction Force ◽  
High Strength ◽  
Bolted Joints ◽  
Strength Calculation ◽  
Stress Strain ◽  
Bolted Connection ◽  
Tension And Compression ◽  
Contact Surfaces ◽  
Thin Walled

The issues of designing structures from thin-walled profiles with nodal joints on bolts are considered, a method of strength calculation is developed. The calculation takes into account two variants of bolted joints on high-strength bolts and unregulated tightening connections, two variants of the operation of a shear-resistant connection with a “breakdown” when overcoming the force over the friction force of the contact surfaces and without a “breakdown”. The methodology includes the bolted connection splitting for the elements working in tension and compression.

Closure to “Surface Treatment of High-Strength Bolted Joints”

1969 ◽  
Vol 95 (8) ◽  
pp. 1768-1769
Author(s):  
Conrad P. Heins ◽  
Charles T. G. Looney
Keyword(s):  
Surface Treatment ◽  
High Strength ◽  
Bolted Joints

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>

Experimental Analysis for the Effect of Impactor Geometry on Carbon Reinforced Composite Materials

2017 ◽  
Vol 25 (9) ◽  
pp. 677-682 ◽  
Author(s):  
Faruk Elaldi ◽  
Busra Baykan ◽  
Can Akto
Keyword(s):  
Composite Materials ◽  
Carbon Fibre ◽  
Composite Plates ◽  
High Strength ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Damage Area ◽  
Reinforced Composite ◽  
Contact Surfaces ◽  
The Impact

For the last three decades, composites have become very preferable materials to be used in the automotive industry, structural parts of aircraft and military systems and spacecraft, due to their high strength and modulus. Composite materials are sometimes exposed to invisible or visible damage due to impact loading during their service life. In this study, the effect of impactor geometry with four different contact surfaces on woven carbon fibre-reinforced composite plates having three different thicknesses are investigated. In the first stage, composite plates were manufactured with the ply orientations of [45/-45/0/90/45/-45]2s, [45/-45/0/90/45/-45]3s, [45/-45/0/90/45/-45]4s based on conventional usage. In the second stage, carbon fibre-reinforced composite test panels were exposed to low velocity impact tests to obtain force-time, energy-time and force-displacement curves. Finally, semi and full penetration of composite panels and damage magnitude were determined. It was found that the impactor geometries with lower contact surfaces such as conical and ogive types were much more penetrative on composite plates than the other geometries, but they caused larger damage area in the vicinity of the impact point.

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