Improving the accuracy of fatigue tests with axial loading

1978 ◽  
Vol 10 (9) ◽  
pp. 1110-1112
Author(s):  
�. Ya. Filatov ◽  
V. �. Pavlovskii ◽  
V. N. Belokurov
Keyword(s):  
Axial Loading ◽  
Fatigue Tests

scholarly journals Interior crack initiation during the very-high-cycle fatigue of railway wheel steel under axial loading and rolling contact loading

2021 ◽  
Author(s):  
Xiao-Long Liu ◽  
Pengcheng Gao ◽  
Si Wu ◽  
Guanzhen Zhang ◽  
Tao Cong
Keyword(s):  
Crack Initiation ◽  
High Cycle Fatigue ◽  
Axial Loading ◽  
Fatigue Tests ◽  
Rolling Contact ◽  
Wheel Steel ◽  
Contact Loading ◽  
Very High Cycle Fatigue ◽  
Very High ◽  
Railway Wheel Steel

In this paper, a comparative study of the very-high-cycle fatigue (VHCF) behavior of railway wheel steel under axial loading and rolling contact loading was conducted. Fatigue tests were performed with an ultrasonic fatigue test machine under axial loading, and the fracture surfaces from the fatigue tests and shattered rims taken from the failed railway wheels were observed. The wheel steel under axial loading presents a VHCF behavior with Mode I crack, and that under rolling contact loading is a VHCF behavior with mix Mode II-III crack. For the VHCF behavior with Mode I crack ,surface and interior crack initiation occurred with equal probability at both low and high stress levels and produced a dual linear S-N curve since the value of fatigue limits for the surface and interior crack initiation are close. For the VHCF behavior with mix Mode II-III crack, cracks were initiated from the interior Al O inclusion and the fatigue life was beyond 10 cycles. Fatigue bands were observed on the fracture surface under rolling contact loading. The ferrite nanograins formed due to the stress state of shear plastic strain with a large compressive stress. The formed nanograins were softer than the matrix caused by the redistribution of the carbon.

Fatigue Capacity of Load Carrying Fillet-Welded Connections Subjected to Axial and Shear Loading

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Inge Lotsberg
Keyword(s):  
Axial Loading ◽  
Steel Structures ◽  
Fatigue Tests ◽  
Shear Loading ◽  
Fillet Welds ◽  
Strength Analysis ◽  
Load Carrying ◽  
Eurocode 3 ◽  
The Status ◽  
Current Design

The status on current design recommendations concerning the fatigue capacity of load carrying fillet welds was presented by Maddox (Maddox, S., 2006, “Status Review on Fatigue Performance of Fillet Welds,” Proceedings of the OMAE Conference, Hamburg, Germany, Jun., Paper No. OMAE2006-92314) based on a literature survey. In order to examine the validity of the recommendations and to supplement the fatigue test database, a test matrix with 33 specimens was developed. This included 8 simple fillet-welded cruciform joints that were subjected to axial loading and 25 fillet-welded tubular specimens that were subjected to axial load and/or torsion for simulation of a combined stress condition in the fillet weld. The data obtained from these fatigue tests are presented in this paper. The test data are also compared with design guidance from IIW (1996, Fatigue Design of Welded Joints and Components: Recommendations of IIW Joint Working Group XIII-XV, A. Hobbacher, ed., Abington Publishing, Cambridge), Eurocode 3 (1993, Eurocode 3: Design of Steel Structures—Part 1–1: General Rules and Rules for Buildings), and DNV-RP-C203 (DNV, 2005, DNV-RP-C203, Fatigue Strength Analysis of Offshore Steel Structures).

Fatigue Capacity of Fillet Welded Connections Subjected to Axial and Shear Loading

2006 ◽  
Author(s):  
Inge Lotsberg
Keyword(s):  
Test Data ◽  
Stress Condition ◽  
Axial Loading ◽  
Fatigue Tests ◽  
Shear Loading ◽  
Cruciform Joints ◽  
The Status ◽  
Current Design ◽  
Tubular Specimens ◽  
Design Guidance

The status on current design recommendations concerning the fatigue capacity of fillet welds was presented by Maddox (2002), based on a literature survey. In order to examine the validity of the recommendations and to supplement the fatigue test data base, a test matrix with 33 specimens was developed. This included 8 simple fillet welded cruciform joints that were subjected to axial loading and 25 fillet welded tubular specimens that were subjected to axial load and/or torsion for simulation of a combined stress condition in the fillet weld. The data obtained from these fatigue tests are presented in this paper. The test data are also compared with design guidance from IIW (1996), Eurocode 3 (1993) and DNV-RP-C203 (2005).

Effects of Plastic Deformation on Fatigue Life of Superduplex Steel Tube Umbilical

2012 ◽  
Author(s):  
Diego F. S. Burgos ◽  
Luís F. S. Parise ◽  
Rafael G. Savioli ◽  
Gustavo H. B. Donato ◽  
Antonio P. Nascimento Filho ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Plastic Deformation ◽  
Plastic Strain ◽  
Fatigue Behavior ◽  
Axial Loading ◽  
Steel Tube ◽  
Fatigue Tests ◽  
Steel Tubes ◽  
Fatigue Data ◽  
Different Levels

This work presents an experimental investigation of the effects of plastic strain on the fatigue behavior of superduplex steel tubes. Fatigue tests using conventional axial loading and a resonant bending setup conducted on 15mm OD tubes made of SAF2507 superduplex steel provides S × N data upon which effects of different levels of plastic strain can be assessed. Despite the inherent scatter in the measured fatigue data, the experiments reveal consistent trends and relatively small effects of plastic strain on fatigue behavior of superduplex steel tubes.

Fatigue tests and design of diamond bird-beak SHS T-joints under axial loading in brace

2016 ◽  
Vol 118 ◽  
pp. 49-59 ◽  
Author(s):  
Lewei Tong ◽  
Guowen Xu ◽  
Dongqiang Yan ◽  
Xiao-Ling Zhao
Keyword(s):  
Axial Loading ◽  
Fatigue Tests ◽  
T Joints ◽  
Bird Beak

Fatigue Strength Assessment on a Multiplanar Tubular KK-Joints by Scaled Model Test

2016 ◽  
Vol 138 (2) ◽  
Author(s):  
Yue Jingxia ◽  
Liu Yuliang ◽  
Zhang Chi ◽  
Zeng Qi ◽  
Dang Zhifan
Keyword(s):  
Model Test ◽  
Hot Spot ◽  
Prediction Method ◽  
Axial Loading ◽  
Offshore Structures ◽  
Fatigue Tests ◽  
Scaled Model ◽  
Element Analysis ◽  
Hot Spot Stress ◽  
Strength Assessment

Multiplanar tubular KK-joints are one of the most popular joint types in offshore structures, which are exposed to cyclic loads and fatigue damages. In this paper, a fatigue prediction method based on scaled model test is proposed. First, a scaled KK-joint, including deviations for model simplification, was designed based on sensitive analysis and similarity analysis. Then, static and fatigue tests on the scaled model under axial loading were performed, by which hot spot stress (HSS) distributions and the maximum HSS were recorded. From the test, the fatigue crack initiates from the location of the maximum HSS and propagates along the weld toe. Finally, the maximum HSS of original KK-joint was deduced by finite element analysis (FEA), and then, the fatigue life was predicted accordingly and compared with the rule-based result.

scholarly journals Fatigue Design Curves for Laser-Metal-Deposited Type 420 Stainless Steel and Effect of an Interval during Deposition Process

2021 ◽  
Author(s):  
Yoshihiko Uematsu ◽  
Ryosuke Sasaki ◽  
Toshifumi Kakiuchi ◽  
Seiei Yamamoto ◽  
Akihiro Zensho ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Fatigue Crack Initiation ◽  
Axial Loading ◽  
Deposition Process ◽  
Fatigue Tests ◽  
Upper And Lower Bounds ◽  
Fatigue Design ◽  
Deposition Processes ◽  
Local Softening ◽  
Induced Defects

Abstract Fully-reversed axial loading fatigue tests were conducted using type 420J1 martensitic stainless steel. The specimens were additively manufactured by a laser metal deposition (LMD) process. The results were compared with conventionally-manufactured (CMed) type 420J2 stainless steel. According to the axial loading fatigue test results, the fatigue strengths of the laser-metal-deposited (LMDed) specimens were nearly comparable to those of the CMed specimens. Fractographic analyses revealed that process-induced defects were hardly seen at the fatigue crack initiation sites of the LMDed specimens. It indicates that defect-free deposition was possible by the LMD process. On the other hand, when the LMD specimens experienced intervals during deposition processes, local softening occurred due to the tempering of the building plate. Fatigue tests revealed that the interval during LMD process had detrimental effect on the fatigue strengths due to the local softening. The upper and lower bounds of S-N curves were proposed as fatigue design curves for the samples with and without the interval during LMD process.

Effect of Loading Sequence on the Fatigue Life of Notched Specimens Made From Steel and Aluminium Alloys

1991 ◽  
Vol 44 (1) ◽  
pp. 27-35 ◽  
Author(s):  
Otto Buxbaum ◽  
Hartmut Kla¨tschke ◽  
Helge Oppermann
Keyword(s):  
Fatigue Life ◽  
Aluminium Alloys ◽  
General Relation ◽  
Statistical Parameter ◽  
Axial Loading ◽  
Fatigue Tests ◽  
Test Results ◽  
Random Loading ◽  
Test Load ◽  
Notched Specimens

A statistical parameter which can be derived from the Markov matrix has been defined in order to characterize the intermixture of random loading fluctuations. By means of this intermixture parameter, load sequences for fatigue tests can be generated closer to reality, and thus more reliable effects as well as effects resulting from loading sequences can be taken into account quantitatively in life calculations. The intermixture parameter has been calculated for 17 test load sequences. The corresponding fatigue test results obtained for notched specimens (Ki = 1.4–3.6) made from steels or aluminium alloys, either under bending or axial loading, led to a general relation between intermixture and fatigue life, being primarily influenced by the stress ratio.

Sign in / Sign up

Export Citation Format

Share Document