Prediction of failure strain according to stress triaxiality of a high strength marine structural steel

2013 ◽  
pp. 69-76
Author(s):  
A Nam ◽  
J Choung
Keyword(s):  
Structural Steel ◽  
Failure Strain ◽  
Stress Triaxiality ◽  
High Strength

scholarly journals Dynamic Behaviour of a High-Strength Structural Steel at Low Temperatures

2019 ◽  
Vol 5 (3) ◽  
pp. 241-250 ◽  
Author(s):  
M. J. Perez-Martin ◽  
J. K. Holmen ◽  
S. Thomesen ◽  
O. S. Hopperstad ◽  
T. Børvik
Keyword(s):  
Experimental Study ◽  
Transition Temperature ◽  
Strain Rate ◽  
Structural Steel ◽  
Low Temperatures ◽  
Failure Strain ◽  
Stress Triaxiality ◽  
High Strength ◽  
Loading Rates ◽  
Static Conditions

Abstract The main objective of this experimental study is to determine the effect of low temperatures on the mechanical behaviour of Strenx 960 Plus high-strength structural steel at different strain rates and stress triaxialities. For this purpose, a comprehensive experimental campaign was designed to characterise the material at a wide range of temperatures and loading rates. The stress triaxiality was varied by testing specimens with different geometry. First, to determine the ductile-to-brittle transition temperature, instrumented Charpy V-notch impact tests were carried out at a range of temperatures from + 20 °C down to − 90 °C. The impact energy dropped gradually with decreasing temperature, but a clear transition temperature could not be identified. A fractography study exhibited a clear dimple structure, revealing predominantly ductile fracture at all temperatures. Then, uniaxial tension tests on smooth and pre-notched axisymmetric specimens under both quasi-static and dynamic loading rates were carried out at room temperature and low temperatures. These tests were conducted to characterise the rate-dependence of the stress–strain behaviour and the failure strain. The results revealed that under quasi-static conditions the flow stress increased with decreasing temperature, while the failure strain was nearly independent of the temperature. Dynamic tensile tests using the same specimen geometries were conducted in a split Hopkinson tension bar at + 20 °C and − 40 °C. The material exhibited a positive strain rate sensitivity at all investigated temperatures. This experimental study reveals that the Strenx 960 Plus steel retains its ductility at temperatures as low as − 40 °C. Brittle failure could not be observed even with combined high strain rate, high stress triaxiality and low temperature.

Failure strain formulation via average stress triaxiality of an EH36 high strength steel

2014 ◽  
Vol 91 ◽  
pp. 218-226 ◽  
Author(s):  
Joonmo Choung ◽  
Woongshik Nam ◽  
Daeyong Lee ◽  
Chang Yong Song
Keyword(s):  
High Strength Steel ◽  
Failure Strain ◽  
Stress Triaxiality ◽  
High Strength ◽  
Average Stress ◽  
Strain Formulation

Failure Prediction of Low-Temperature High-Strength Steel on Average Stress Triaxiality Using Abaqus User-Subroutine

2014 ◽  
Author(s):  
Joonmo Choung ◽  
Sung-Won Yoon ◽  
Sung-Ju Park ◽  
Woongshik Nam
Keyword(s):  
Transverse Direction ◽  
Failure Strain ◽  
Stress Triaxiality ◽  
Strain Curve ◽  
High Strength ◽  
Tensile Tests ◽  
Finite Element Code ◽  
User Subroutine ◽  
Fracture Simulation ◽  
Class Steel

This study deals with failure strain prediction according to stress triaxiality of a typical polar class steel EH36. Choung et al. [1, 2] have formulated failure strain curve of EH36 steel by carrying out a number of tensile tests for round and flat specimens with various notches. Extra tests for notched flat specimens which machined in transverse direction are conducted to formulate the failure strain curve. In order to verify the validity of failure strain curve, we develop user-subroutine (VUSDFLD) of a commercial finite element code, Abaqus/Explicit. Fracture simulation with user-subroutine shows that two results are closely coincident by comparison of force-elongation curves.

STRENX 700

Alloy Digest ◽  
2017 ◽  
Vol 66 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Physical Properties ◽  
Structural Steel ◽  
Tensile Properties ◽  
High Strength ◽  
Load Bearing ◽  
Minimum Yield

Abstract Strenx 700 is a high-strength structural steel with a minimum yield strength of 650–700 MPa (94–102 ksi) depending on thickness. Strenx 700 meets the requirements of EN 10 025-6 for the S690 grade and thicknesses. Typical applications include demanding load-bearing structures. This datasheet provides information on composition, physical properties, and tensile properties as well as fracture toughness. It also includes information on surface qualities as well as forming, machining, and joining. Filing Code: SA-779. Producer or source: SSAB Swedish Steel Inc..

DILLIMAX 690

Alloy Digest ◽  
2012 ◽  
Vol 61 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Physical Properties ◽  
Structural Steel ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Fine Grained ◽  
Minimum Yield

Abstract Dillimax 550 is a high-strength quenched and tempered, fine-grained structural steel with a minimum yield strength of 690 MPa (100 ksi). Plate is delivered in three qualities: basic, tough, and extra tough. This datasheet provides information on composition, physical properties, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, and joining. Filing Code: SA-652. Producer or source: Dillinger Hütte GTS.

DILLIMAX 500

Alloy Digest ◽  
2012 ◽  
Vol 61 (3) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Physical Properties ◽  
Structural Steel ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Fine Grained ◽  
High Toughness ◽  
Minimum Yield

Abstract Dillimax 500 is a high-strength quenched and tempered, fine-grained structural steel with a minimum yield strength of 500 MPa (72 ksi). Plate is delivered in three qualities: basic, high toughness, and extra tough. This datasheet provides information on composition, physical properties, and tensile properties as well as fracture toughness. It also includes information on surface qualities as well as forming, heat treating, and joining. Filing Code: SA-645. Producer or source: Dillinger Hütte GTS.

RQT 501

Alloy Digest ◽  
2012 ◽  
Vol 61 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
Structural Steel ◽  
Tensile Properties ◽  
High Strength ◽  
Bend Strength

Abstract RQT 501 is a quenched and tempered structural steel available in thicknesses 8 to 100 mm (0.3 to 4.0 in.) that combines high strength with excellent forming and welding performance. This datasheet provides information on composition, physical properties, tensile properties, and bend strength as well as fracture toughness. It also includes information on forming, machining, and joining. Filing Code: SA-662. Producer or source: Europe, Corus Long Products.

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