scholarly journals THE BASIS EXAMINATION OF EFFECTS OF BOLT PITCH AND NUMBER OF BOLTS ON BEARING LIMIT STRESS OF HIGH STRENGTH BOLTED JOINT

2016 ◽  
Vol 72 (1) ◽  
pp. 119-132 ◽  
Author(s):  
Hitoshi MORIYAMA ◽  
Akiko TABATA ◽  
Takashi YAMAGUCHI ◽  
Misa FUJIBAYASHI
Keyword(s):  
High Strength ◽  
Bolted Joint ◽  
Limit Stress

Influence of Stress on Degradation and Life Prediction of High Strength Ferritic Steels

2004 ◽  
Author(s):  
Kazuhiro Kimura ◽  
Kota Sawada ◽  
Kiyoshi Kubo ◽  
Hideaki Kushima
Keyword(s):  
Yield Stress ◽  
Elastic Limit ◽  
High Strength ◽  
Time To Rupture ◽  
Limit Stress ◽  
Creep Resistant Steels ◽  
Grade 91 ◽  
Term Creep ◽  
Grade 91 Steel

Influence of stress on creep deformation and degradation behavior has been investigated. Corresponding to inflection of stress vs. time to rupture curve, difference in recovery phenomena, that was homogeneous in short-term and inhomogeneous in long-term, was observed. Inflection of stress vs. time to rupture curve took place at the stress condition corresponding to half of 0.2% offset yield stress at the temperature. Elastic limit stress of Grade 91 steel was evaluated to be 150MPa at 600°C and 100MPa at 650°C, by means of stress abrupt change test. These stresses were found to be almost the same as half of 0.2% offset yield stress at the temperatures. Inflection of stress vs. time to rupture curve is caused by transient of applied stress from higher level than elastic limit to within elastic range. It has been concluded that long-term creep strength of ferritic creep resistant steels should be predicted from the selected creep rupture data under the stresses lower than elastic limit by considering half of 0.2% offset yield stress at the temperature, by means of Larson-Miller parameter with a constant of 20.

Experimental Studies of Glass Reinforced Aluminum (GLARE) Bolted Joint

2012 ◽  
Vol 217-219 ◽  
pp. 124-129
Author(s):  
Ji Feng Zhang ◽  
Zi Zhen Cao ◽  
Yong Gang Xie
Keyword(s):  
Impact Resistance ◽  
Experimental Studies ◽  
High Strength ◽  
Geometric Parameters ◽  
Experimental Program ◽  
Bolted Joint ◽  
Threshold Values ◽  
Tightening Torque ◽  
High Fatigue ◽  
Ply Orientation

GLARE laminates with outstanding impact resistance, high fatigue resistance and a number of excellent performances are combined by ductile aluminum layers and high strength FRP layers. An experimental program was conducted to estimate the influence of geometric parameters, ply orientation and tightening torque on the performances of GLARE bolted joint. The study showed that the parameters of GLARE bolted joint have intrinsic properties of metal bolted joint and composite bolted joint. The design threshold values including of geometric parameters, ply orientation and tightening torque were given.

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).

scholarly journals Paint Coating Removal by Heating for High-Strength Bolted Joints in Steel Bridge and Its Influence on Bolt Axial Force

2021 ◽  
Vol 2 (4) ◽  
pp. 728-738
Author(s):  
Tomonori Nakahara ◽  
Mikihito Hirohata ◽  
Shinsuke Kondo ◽  
Toru Furuichi
Keyword(s):  
High Strength ◽  
Bolted Joints ◽  
Maximum Temperature ◽  
Steel Bridge ◽  
Bolted Joint ◽  
Paint Coating ◽  
Axial Forces ◽  
Ceramic Heater ◽  
Coating Removal ◽  
Series Of Experiments

A series of experiments were carried out for developing a paint coating removal method for high-strength bolted joints in steel bridges. The paint-coated bolted joint specimens were heated to the target temperature of 200 °C by using a sheet-type ceramic heater. The maximum temperature of specimens could be controlled within 10% of the target value. The paint coating was easily removed by using general tools after heating. The behaviour of bolts with thermal expansion and shrinkage was monitored by strain gauges attached to the bolts during heating. It was estimated that the axial forces of the bolts were reduced by 2.6% of the initially installed axial forces, on average.

Effect of Material and Lubrication Conditions on the Underhead Frictional Response in High Strength Socket-Head Screws

2020 ◽  
Author(s):  
Dario Croccolo ◽  
Massimiliano De Agostinis ◽  
Stefano Fini ◽  
Giorgio Olmi ◽  
Francesco Robusto ◽  
...  
Keyword(s):  
Tribological Behavior ◽  
High Strength ◽  
Design Parameters ◽  
Bolted Joint ◽  
Lower Strength ◽  
Coefficient Estimation ◽  
Experimental Campaign ◽  
Proper Design ◽  
Lubrication Conditions ◽  
Current Operating

Abstract The present paper investigates the influence of several design parameters on the frictional response at the underhead in a bolted joint, involving high strength socket-head screws: M8 class 14.9 with black oxidization coating. The experimentation deals with different underhead materials (Steel, Aluminium), lubrication conditions (dry, lubricated) and repeated tightening operations. The awareness of the actual friction coefficients, depending on the current operating parameters, is a useful tool, to support the most proper design of a bolted joint. The experimental campaign has been run by a testing rig for friction coefficient estimation, complying with the recommendations by International Standard ISO 16047 and the automotive Standard VW01131-1 in order to consider the effect of the tightening speed normally adopted in the automotive field. The axial preload generated upon tightening induces a high pressure on the remarkably small underhead surface of the utilized high strength socket-head screws and is therefore likely to affect the tribological response. Consequently, some differences may be expected with respect to the tribological behavior of screws belonging to lower strength grades. This is particularly true, when tightening is done without bearing lubrication, and through several repeated assembly-disassembly operations. The collected data have been processed by the tools of ANOVA and F-Test, in order to assess the significance of each factor, as well as related interactions.

scholarly journals SLIP TESTS OF HIGH STRENGTH BOLTED JOINT ON THICK PLATE USING LARGE DIAMETER BOLT

2006 ◽  
Vol 62 (2) ◽  
pp. 267-278
Author(s):  
Kuniaki MINAMI ◽  
Takeshi MORI ◽  
Hidenobu HORIKAWA
Keyword(s):  
Thick Plate ◽  
Large Diameter ◽  
High Strength ◽  
Bolted Joint
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