Low-Cycle Axial Fatigue Behavior of Mild Steel

2009 ◽  
pp. 5-5-20 ◽  
Author(s):  
J. T.P. Yao ◽  
W. H. Munse
Keyword(s):  
Mild Steel ◽  
Fatigue Behavior ◽  
Axial Fatigue

scholarly journals On the Low Cycle Fatigue Behavior in the Longitudinally Butt Welded Joints between High Strength Steel and Mild Steel

1977 ◽  
Vol 1977 (142) ◽  
pp. 236-244
Author(s):  
Kinichi Nagai ◽  
Mitsumasa Iwata ◽  
Kenhichiro Kurihara ◽  
Junkichi Yagi ◽  
Yasumitsu Tomita
Keyword(s):  
Mild Steel ◽  
Welded Joints ◽  
High Strength Steel ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
High Strength ◽  
Cycle Fatigue

Effects of loading mode on the fatigue behavior of laser welds in automobile mild steel sheet

2016 ◽  
Vol 60 (3) ◽  
pp. 535-545 ◽  
Author(s):  
Masayoshi Inohara ◽  
Hiroyuki Akebono ◽  
Masahiko Kato ◽  
Atsushi Sugeta
Keyword(s):  
Mild Steel ◽  
Steel Sheet ◽  
Fatigue Behavior ◽  
Loading Mode ◽  
Laser Welds

Multiple Axial Fatigue of Pressure Armors in Flexible Risers

2011 ◽  
Author(s):  
Naiquan Ye ◽  
Svein Sævik
Keyword(s):  
Oil And Gas ◽  
Fatigue Behavior ◽  
Equivalent Stress ◽  
Local Stress ◽  
External Pressure ◽  
Mean Stress ◽  
Stress Range ◽  
Stress Components ◽  
Flexible Risers ◽  
Axial Fatigue

The design of flexible risers has been challenged by the exploration of oil and gas goes into ever-deep regions as in Mexico Gulf and West Africa. Comparing to the fatigue analysis of the tensile armors which have been extensively investigated in recent years, much less effort has been devoted in the fatigue of pressure armor. The fatigue of the pressure armor is much more complicated than the tensile armors. For the tensile armor, the longitudinal stress along the helix path dominates the fatigue behavior, while for the pressure armor, more stress components will play together to affect its fatigue. If the fatigue of the tensile armor can be characterized as a uni-axial fatigue phenomenon, the fatigue of the pressure armor will be a typical multi-axial problem. The stress components in the pressure armor consist of contribution from the following sources: stress in the hoop direction due to internal/external pressure, stress in the radial direction due to the pressure and contact pressure from the tensile armor layer, stresses caused by the ovalization when the riser is bent, and local stresses due to local bending (nub/valley contact). The friction between the nub and valley interface is reflected in the local stress components as well. A Finite Element (FE) based computer program BFLEX developed by MARINTEK for the stress analysis of flexible risers are capable of calculating the complicate stress components of the pressure armors. In order to perform fatigue damage calculation for the pressure armor, mean stress and stress range must be computed based on these stress components. Mean stress correction becomes very important due to large mean stress experienced by the pressure armor. There are several ways to make use of these stress components to derive the mean stress and stress range. Equivalent stress models and critical plane models are the main models to address the general feature of the multi-axial fatigue. The application of these models on the fatigue of the pressure armor of the flexible risers will be discussed in this paper. The best suited model will be suggested based on the specific stress components in the pressure armor.

Multi-axial Fatigue Behavior of Notched Composite Structures

2018 ◽  
Author(s):  
YAO QIAO ◽  
ANTINIO ALESSANDRO DELEO ◽  
KUOTIAN LIAO ◽  
MARCO SALVIATO
Keyword(s):  
Composite Structures ◽  
Fatigue Behavior ◽  
Axial Fatigue

ULTRASONIC FATIGUE BEHAVIOR OF A Fe-BASED WARM-COMPACTED POWDER METALLURGY MATERIAL

2013 ◽  
Vol 27 (19) ◽  
pp. 1341027
Author(s):  
YU-HENG LU ◽  
XUAN YE ◽  
LEI HU ◽  
FEI LUO ◽  
ZHI-YU XIAO
Keyword(s):  
Heat Treatment ◽  
Powder Metallurgy ◽  
Fatigue Strength ◽  
Fatigue Test ◽  
Fatigue Testing ◽  
Fatigue Behavior ◽  
Powder Metallurgy Material ◽  
Ultrasonic Fatigue ◽  
Ultrasonic Fatigue Test ◽  
Axial Fatigue

Fe -2 Cu -2 Ni -1 Mo -1 C powder metallurgy material was fabricated by die-wall lubricated warm compaction and ultrasonic fatigue test was carried out for as-sintered and heat treatment samples. Material fatigue strength reaches 249 MPa under axial fatigue testing. The sintered material consists of acicular martensite, pearlite, bainite and retained austenite. Tempered martensite is the major phases after heat-treatment. Cleavage plane and dimples is mixed fracture for sample after axial fatigue test. Mechanical properties of after heat treatment materials are improved and fatigue strength reaches 382 MPa under 107 cycles in bending ultrasonic fatigue test. The fatigue strength increases significantly in high cycles range.

Multi-Axial Fatigue of Sheet Metal Joints Under Clamp Load and Cyclic Bending

2017 ◽  
Author(s):  
Andrea Piccatto ◽  
Giovanni Belingardi ◽  
Zhijun Wu ◽  
Sayed A. Nassar
Keyword(s):  
Sheet Metal ◽  
Fatigue Testing ◽  
Fatigue Behavior ◽  
Bending Moment ◽  
Metal Plate ◽  
Von Mises Stress ◽  
Bolted Joint ◽  
Cyclic Bending ◽  
Bearing Stress ◽  
Axial Fatigue

A validated Von-Mises stress-based model is presented for multi-axial fatigue evaluation of clamped sheet metal joints that are subjected to a cyclic bending stress additional to the compressive bearing stress in the bolted joint. Joint material, bolt preload level, and the amplitude level of the cyclic bending moment are studied for their effect on the fatigue life of the clamped sheet metal plate. Bolt tightening to a precise preload level is accomplished by using an ultrasonic instrument that has been mechanically pre-calibrated to convert the time delay of longitudinal ultrasonic wave reflection to a bolt elongation and corresponding preload value. Fatigue data is generated using an MTS fatigue testing system. Experimental and FEA results are fitted into a multi-axial model for predicting the fatigue behavior of the bolted joint. Discussion and data analysis are provided.

scholarly journals Rotary bending fatigue behavior of cold-form-rolled mild steel.

1986 ◽  
Vol 35 (397) ◽  
pp. 1163-1169
Author(s):  
Noboru ONO ◽  
Taizo TOHYAMA ◽  
Takeo TSUCHIKAWA
Keyword(s):  
Mild Steel ◽  
Fatigue Behavior ◽  
Bending Fatigue

Axial fatigue behavior of binder-treated versus diffusion alloyed powder metallurgy steels

2001 ◽  
Vol 308 (1-2) ◽  
pp. 180-188 ◽  
Author(s):  
N. Chawla ◽  
T.F. Murphy ◽  
K.S. Narasimhan ◽  
M. Koopman ◽  
K.K. Chawla
Keyword(s):  
Powder Metallurgy ◽  
Fatigue Behavior ◽  
Alloyed Powder ◽  
Axial Fatigue
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