Yield-Before-Break Fracture Mechanics Analysis of High-Strength Steel Pressure Vessels

1995 ◽  
Vol 117 (1) ◽  
pp. 79-84 ◽  
Author(s):  
J. H. Underwood ◽  
R. A. Farrara ◽  
M. J. Audino
Keyword(s):  
Fracture Mechanics ◽  
High Strength Steel ◽  
High Strength ◽  
Pressure Vessels ◽  
Safe Yield ◽  
High Toughness ◽  
Final Failure ◽  
Crack Type ◽  
Type Of Failure

Case study examples of fracture mechanics testing and analysis of Ni-Cr-Mo high strength steel cannon tubes are presented. The testing and analysis include the situation of significant plastic deformation accompanying fracture, which often occurs when high pressure is applied to high-toughness steel pressure vessels. analysis is based on a comparison of the size of the Irwin crack-tip plastic zone the remaining ligament of the tube in the area of the critical fatigue crack which causes final failure. The results of the study show that the type of final failure can be predicted—as either a relatively safe, yield-before-break failure or a less safe running-crack type of failure—for a variety of material, configuration, and loading conditions.

Fracture Mechanics Assessment of Hydrogen Storage Vessel

2021 ◽  
Author(s):  
Xiaoliang Jia ◽  
Zhiwei Chen ◽  
Fang Ji
Keyword(s):  
High Pressure ◽  
Fracture Mechanics ◽  
Hydrogen Storage ◽  
High Strength Steel ◽  
High Strength ◽  
Linear Elastic Fracture Mechanics ◽  
Storage Vessel ◽  
Linear Elastic ◽  
Elastic Fracture ◽  
Hydrogen Storage Vessel

Abstract High strength steel is usually used in fabrication of hydrogen storage vessel. The fracture toughness of high strength steel will be decreased and the crack sensitivity of the structures will be increased when high strength steels are applied in hydrogen environment with high pressure. Hence, the small cracks on the surface of pressure vessel may grow rapidly then lead to rupture. Therefore, this paper makes a series of research on how to evaluate the 4130X steel hydrogen storage vessel with fracture mechanics. This study is based on the assumption that there is a semi-elliptic crack on internal surface of hydrogen storage vessel. First of all, based on linear elastic fracture mechanics, the stress intensity factors and crack tolerance of 4130X steel hydrogen storage vessel have been calculated by means of finite element method based on interaction integral theory and polynomial-approximated approach from GB/T 34019 Ultra-high pressure vessels. Then, a comparative study has been made from the results of above methods to find out the difference between them. At last, the fatigue life of a 4130X steel hydrogen storage vessel has been predicted based on linear elastic fracture mechanics and Paris formula. The calculation methods and analysis conclusion can be used to direct the design and manufacture of hydrogen storage vessel.

MQL machining of high strength steel: A case study on surface quality characteristic

2020 ◽  
Vol 26 ◽  
pp. 2616-2618 ◽  
Author(s):  
Rasmi Ranjan Mishra ◽  
Ashok Kumar Sahoo ◽  
Amlana Panda ◽  
Ramanuj Kumar ◽  
Diptikanta Das ◽  
...  
Keyword(s):  
Surface Quality ◽  
High Strength Steel ◽  
High Strength ◽  
Quality Characteristic

Improvement of Fatigue Limit by Shot Peening for High-Strength Steel Containing a Crack-Like Surface Defect: Influence of Stress Ratio

2012 ◽  
Author(s):  
Jun Yasuda ◽  
Koji Takahashi
Keyword(s):  
Fatigue Limit ◽  
Shot Peening ◽  
High Strength Steel ◽  
Stress Ratio ◽  
Structural Integrity ◽  
Fatigue Cracks ◽  
High Strength ◽  
Crack Size ◽  
Pressure Vessels ◽  
Circular Slit

It is well known that shot peening (SP) prevents the initiation and propagation of fatigue cracks and improves the fatigue limit of metals. It was recently reported that a surface crack can be rendered harmless by SP. Actual pressure vessels are generally operated under a positive stress ratio (R > 0). However, the effects of SP on the improvement of fatigue limits under R > 0 remain unclear. If these effects were clarified, the structural integrity of pressure vessels could be advanced. Thus, in this study, we investigated the influence of SP on fatigue limits and on the crack size that could be rendered harmless by SP under R > 0. High-strength steel specimens containing a semi-circular slit were subjected to SP. Bending fatigue tests were carried out under R = 0.4. The fatigue limits of the SP specimens increased 50∼100% compared with Non-SP specimens. Slits under 0.2 mm in depth were successfully rendered harmless by SP. The increasing ratios of the fatigue limit under R = 0.4 were lower than those under R = 0. However, the size of semi-circular slit that can be rendered harmless by SP remained the same. The size of the slit that can be rendered harmless can be predicted by calculating stress intensity factors.

scholarly journals Investigation of Metallurgical Factors in the Production of High Strength Steel Plate with High Toughness by Controlled Rolling

1972 ◽  
Vol 58 (13) ◽  
pp. 1848-1860 ◽  
Author(s):  
Hiroyoshi MATSUBARA ◽  
Tatsumi OSUKA ◽  
Isao KOZASU ◽  
Koshiro TSUKADA
Keyword(s):  
High Strength Steel ◽  
Steel Plate ◽  
High Strength ◽  
Controlled Rolling ◽  
High Toughness
Sign in / Sign up

Export Citation Format

Share Document