Effect of notch sharpness on ductile-brittle temperature of highly alloyed high-strength steel for welded structures

1975 ◽  
Vol 7 (3) ◽  
pp. 369-371
Author(s):  
S. A. Zandberg ◽  
V. A. Kroshkin ◽  
Yu. I. Rubenchik
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Welded Structures ◽  
Notch Sharpness

Tensile Tests on High Strength Steel Q345 Notched Plates with the Moderate Thickness

2010 ◽  
Vol 143-144 ◽  
pp. 1450-1453
Author(s):  
Wan Zhen Wang ◽  
Lan Ying Jiang ◽  
Ren Quan Sun ◽  
Xin Tang Wang
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Tensile Tests ◽  
Fracture Load ◽  
Displacement Curve ◽  
Notch Depth ◽  
Fracture Ductility ◽  
Notch Sharpness ◽  
Load Displacement ◽  
Notch Edge

In order to study fracture mechanics of high strength steel with the moderate thickness, fracture tests were performed on 10 elliptical notched plates with the thickness of 16mm fabricated from high strength steel Q345. The effect of notch sharpness (the ratio of the length of short axis to that of long axis of elliptic notch, b/a) and notch depth (the ratio of the length of long axis of elliptic notch to the width of plate, a/w) on fracture model of high strength steel was examined. Test results show that the first crack initiates at the notch edge. The fracture ductility is low for the specimens with the sharper notch (a smaller ratio b/a), and the point of crack load lies in hardening phase of load-displacement curve. The fracture ductility is high for the specimens with the obtuse notch (a bigger ratio b/a), and the point of fracture load lies in necking phase of load-displacement curve. There is no qualitative relationship of fracture ductility and the notch depth (a/w). The ultimate strength of notched plates is independent of the notch sharpness (b/a) and notch depth (a/w).

Fracture Test on High Strength Steel Plates with Elliptical Hole

2010 ◽  
Vol 44-47 ◽  
pp. 2647-2650
Author(s):  
Wan Zhen Wang ◽  
You Qian Huang ◽  
Ren Quan Su ◽  
Xin Tang Wang
Keyword(s):  
High Strength Steel ◽  
Elliptic Hole ◽  
Elliptical Hole ◽  
High Strength ◽  
Fracture Load ◽  
Displacement Curve ◽  
Notch Depth ◽  
Fracture Ductility ◽  
Notch Sharpness ◽  
Load Displacement

In order to study fracture mechanics of high strength steel with the moderate thickness, fracture tests were performed on 10 plates with elliptical hole fabricated from high strength steel Q345 with the thickness of 16mm. The effect of the notch sharpness (the ratio of the length of short axis to that of long axis of elliptic hole, b/a) and the notch depth (the ratio of the length of long axis of the elliptic hole to the width of plate, 2a/w) on fracture model of high strength steel was examined. Test results show that the first crack initiates at the notch edge. The fracture ductility is lower for the specimens with the sharper notch (a smaller ratio b/a) and the deeper notch (a larger ratio 2a/w), and the point of crack load lies in hardening phase of load-displacement curve. The fracture ductility is higher for the specimens with the obtuse notch (a larger ratio b/a), and the point of fracture load lies in necking phase of load-displacement curve. The ultimate strength of notched plates is independent of the notch sharpness (b/a) and the notch depth (2a/w).

COMPARATIVE CHARACTERISTICS OF PHYSICAL AND MECHANICAL PROPERTIES OF COMPOSITE MATERIALS AND HIGH-STRENGTH STEEL 30FGSN2A

2020 ◽  
Author(s):  
I.R. Antypes ◽  
◽  
V.V. Zaitsev ◽  
Keyword(s):  
Composite Materials ◽  
High Strength Steel ◽  
Critical Stress ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Aviation Industry ◽  
Specific Strength ◽  
Aircraft Landing ◽  
Carbon Plastics ◽  
Aircraft Landing Gear

Currently, the use of composite materials is increasingly used in various areas of the national economy, including the aviation industry. The materials of this article are devoted to the study of the use of composite materials for the manufacture of aircraft landing gear in comparison with the traditionally used brand of steel. As a result of the work carried out, it was found that the slope made of carbon fiber showed a critical stress twice as high as its design made of 30xgsn2a steel. In addition, carbon plastics are superior to high-strength steel in terms of specific strength, stiffness, and tensile strength.

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