scholarly journals Theoretical and Experimental Study on the Antisliding Performance of Casting Steel Cable Clamps

2019 ◽  
Vol 2019 ◽  
pp. 1-18 ◽  
Author(s):  
Yangjie Ruan ◽  
Bin Luo ◽  
Mingmin Ding ◽  
Lifan Huang ◽  
Zhengxing Guo
Keyword(s):  
Theoretical Model ◽  
Transversely Isotropic ◽  
High Strength ◽  
Clamping Force ◽  
Steel Cable ◽  
Cable Tension ◽  
Bolt Preload ◽  
Term Creep ◽  
Casting Steel

For large-span cable structures, a cable clamp is a key joint that connects adjacent structural components. In general, the antisliding performance of cable clamps determines their resistance capacity, and the antisliding force is generated by the clamping force induced by the high-strength bolts and the contact surfaces between the cable and the clamp. Since the existing methods are not sufficiently comprehensive for use to predict the precise bolt preload, a theoretical model developed by considering transversely isotropic material and the generalized Hook’s law is presented to predict the attenuation values of the bolt clamping force and the corresponding parameters. Then, to meet the requirements of Eurocode 3, a new laboratory test is performed to reveal the antisliding mechanism of cable clamps, considering the effects of long-term creep and cable tension. According to the results of the data collected by real-time monitoring, the actual ultimate antisliding force of the clamp and the comprehensive friction coefficient are determined. Finally, a comparative study between the theoretical results and the experimental results is conducted. The proposed theoretical model can predict the actual attenuation of the bolt clamping force after cable tension. The results show that the stiffness of the clamp plate should be minimized when designing the clamp to reduce the loss of the bolt preload.

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.

Long-Term Stabilization of Creep-Resistant Ferritic Steels for Highly Efficient Ultra-Supercritical Power Plants

2010 ◽  
Vol 72 ◽  
pp. 12-21 ◽  
Author(s):  
Fujio Abe
Keyword(s):  
Creep Strength ◽  
Power Plants ◽  
High Strength ◽  
Highly Efficient ◽  
Heat Resistant ◽  
Nickel Base ◽  
Ar Gas ◽  
Term Creep ◽  
Heat Resistant Steels

Alloy-designing of high-strength ferritic heat resistant steels has been investigated for application to highly efficient, low emission ultra-supercritical power plant with maximum steam temperature of 700 oC. Ferritic heat resistant steels can be applied to the next highest temperature components and are strongly desired to expand their temperature range up to 650 oC in order to minimize the requirement of expensive nickel base superalloys. A dispersion of nanometer size MX nitrides along boundaries and the addition of boron significantly improve long-term creep strength. Newly alloy-designed 9Cr-3W-3Co-0.2V-0.05Nb steel with 160 ppm boron and 85 ppm nitrogen exhibits excellent creep strength of base metal and no degradation in welded joints at 650 oC. The protective Cr2O3-rich scale forms on the surface of 9Cr steel by pre-oxidation treatment in Ar gas, which significantly improves the oxidation resistance in steam at 650 oC.

Research on Creep Performance of C60 High Performance Concrete

2009 ◽  
Vol 405-406 ◽  
pp. 400-404
Author(s):  
Jian Yin ◽  
Yi Jin Li ◽  
Ke Ren Zheng ◽  
Shi Dong Luo ◽  
Ai Guo Yan ◽  
...  
Keyword(s):  
High Strength Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Railway Bridge ◽  
Engineering Construction ◽  
Strength Concrete ◽  
Creep Coefficient ◽  
Term Creep

It was tested creep performance of C60 high strength concrete and C60 HPC to calculate the long-term creep of C60 HPC accurately, which was combined with engineering construction of Yichang Chang Jiang Railway Bridge. It was concluded the creep degree and creep coefficient of C60 HPC by means of optimization fit calculation, which gives scientific foundation for the design and construction of this bridge.

Subcritical Crack Growth and Long-Term Strength in Rock and High-Strength and Ultra Low-Permeability Concrete

2009 ◽  
Vol 58 (6) ◽  
pp. 525-532 ◽  
Author(s):  
Yoshitaka NARA ◽  
Masafumi TAKADA ◽  
Daisuke MORI ◽  
Hitoshi OWADA ◽  
Tetsuro YONEDA ◽  
...  
Keyword(s):  
Crack Growth ◽  
Subcritical Crack Growth ◽  
High Strength ◽  
Low Permeability ◽  
Term Strength

KUBOTA KNC-03

Alloy Digest ◽  
2010 ◽  
Vol 59 (1) ◽  
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Strength ◽  
Temperature Performance ◽  
Resistance To Oxidation

Abstract Kubota KNC-03 is a grade with a combination of high strength and excellent resistance to oxidation. These properties make this alloy suitable for long-term service at temperature up to 1250 deg C (2282 deg F). This datasheet provides information on physical properties, hardness, elasticity, tensile properties, and compressive strength as well as creep. It also includes information on high temperature performance as well as casting and joining. Filing Code: Ni-676. Producer or source: Kubota Metal Corporation, Fahramet Division. See also Alloy Digest Ni-662, April 2008.

ATI 6-2-4-2

Alloy Digest ◽  
2020 ◽  
Vol 69 (8) ◽  
Keyword(s):  
Tensile Strength ◽  
Titanium Alloy ◽  
High Temperature ◽  
Creep Strength ◽  
High Strength ◽  
Heat Treating ◽  
Good Combination ◽  
Long Term Stability ◽  
Temperature Performance

Abstract ATI 6-2-4-2 is a near-alpha, high strength, titanium alloy that exhibits a good combination of tensile strength, creep strength, toughness, and long-term stability at temperatures up to 425 °C (800 °F). Silicon up to 0.1% frequently is added to improve the creep resistance of the alloy. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ti-169. Producer or Source: ATI.

scholarly journals The reputation trap of NGO accountability

2015 ◽  
Vol 7 (3) ◽  
pp. 426-463 ◽  
Author(s):  
Stephen E. Gent ◽  
Mark J. C. Crescenzi ◽  
Elizabeth J. Menninga ◽  
Lindsay Reid
Keyword(s):  
Theoretical Model ◽  
Unintended Consequences ◽  
International Crisis ◽  
Governmental Organizations ◽  
Non Governmental Organizations ◽  
Policy Goals ◽  
Ngo Accountability ◽  
The Relationship

Can concerns for one’s reputation cause non-governmental organizations (NGOs) to alter their behavior to the detriment of achieving their policy goals? To answer this question, we explore the relationship between NGOs and their donors. Our theoretical model reveals that reputation can be a key piece of information in the decision to fund an NGO’s activities. Reputation can become so important to the NGO’s survival that it interferes with the long-term policy goals of the organization. As such, reputations can become a double-edged sword, simultaneously providing the information donors seek while constraining NGOs from realizing policy goals. We apply this logic to the problem of NGO accountability, which has received increasing attention in recent years, and demonstrate that the tools used by donors to improve accountability can trigger unintended consequences. We illustrate this strategic dynamic with two types of NGO activity: water improvement and international crisis mediation.

Statistical reinterpretation of the long term creep behaviour of the Ismetpasa segment of North Anatolian Fault, Turkey

2021 ◽  
pp. 228947
Author(s):  
Gokhan Gurbuz ◽  
Caglar Bayik ◽  
Saygin Abdikan ◽  
Kurtulus Sedar Gormus ◽  
Senol Hakan Kutoglu
Keyword(s):  
Creep Behaviour ◽  
North Anatolian Fault ◽  
Term Creep
Sign in / Sign up

Export Citation Format

Share Document