Fatigue tests of butt welds and plates edges of 80 mm thick plates

2011 ◽  
pp. 511-519
Author(s):  
H von Selle ◽  
O Doerk ◽  
J Kang ◽  
J Kim
Keyword(s):  
Fatigue Tests ◽  
Thick Plates ◽  
Butt Welds

Fatigue tests and life prediction of 16 Mn steel butt welds without crack-like defect

1994 ◽  
Vol 68 (3) ◽  
pp. 275-285 ◽  
Author(s):  
Zheng Xiulin ◽  
L� Baotong ◽  
Cui Tianxie ◽  
L� Xiaoyan ◽  
Lin Chao
Keyword(s):  
Life Prediction ◽  
Fatigue Tests ◽  
Butt Welds ◽  
Mn Steel

scholarly journals Joint Hydrogen Susceptibility of 304 SS Welded with Titanium/ Podatność Połczenia Na Wodorowanie W Układzie Plateru Stal 304 Ss Zgrzewanym Wybuchowo Z Tytanem

2014 ◽  
Vol 59 (4) ◽  
pp. 1605-1610 ◽  
Author(s):  
E. Mazancová ◽  
D. Ostroushko ◽  
K. Saksl ◽  
A. Niesłony
Keyword(s):  
Heat Treatment ◽  
Intermetallic Phase ◽  
Threshold Level ◽  
Fatigue Tests ◽  
Subsequent Heat Treatment ◽  
Commercial Purity ◽  
Thick Plates ◽  
Hydrogen Charging ◽  
Hydrogen Induced Cracking ◽  
Monochromatic Synchrotron

Abstract Welds of thick plates (304 SS) clad with Ti of commercial purity in as-received state and also after subsequent heat treatment and/or after hydrogen charging were investigated. Fatigue tests were carried out at amplitude of 20 Hz and in case of bimetal without hydrogen charging also at amplitude of 40 Hz. After heat treatment, charged welds showed higher threshold level than the welds without heat treatment. Energy dispersed analyses (EDA) of fracture surfaces showed that failure predominantly occurred in joint. Hydrogen induced cracking (HIC) response of bimetal samples demonstrated favourable results both after welding and after subsequent heat treatment. Short and thin cracks were observed, exclusively located in mixed zone, where approx. 16-20 at. % of Ti using EDX (energy dispersed analyser) was revealed. By application of monochromatic synchrotron radiation Ti-α , Fe-fcc, Fe-bcc and intermetallic phase Fe2Ti were detected.

Influence of Technology of Hot Forming of Plates from Aluminum Alloys Al-Cu-Li-Zn and Al-Zn-Mg-Cu on Resistance to Fatigue Fracture

2020 ◽  
Vol 22 (4) ◽  
pp. 94-109
Author(s):  
Kirill Zakharchenko ◽  
◽  
Vladimir Kapustin ◽  
Alexey Larichkin ◽  
Yaroslav Lukyanov ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Aluminum Alloys ◽  
Fatigue Fracture ◽  
Fatigue Failure ◽  
Strength Properties ◽  
Fatigue Tests ◽  
Measuring System ◽  
Fatigue Properties ◽  
Thick Plates ◽  
Pressure Shaping

Introduction. One of the primary objectives in the development of promising aircraft products is to reduce the weight of the aircraft structure. This problem can be solved by applying new low density materials such as aluminum alloys alloyed with lithium (for example, Al-Cu-Li-Zn) in the design of parts. The use of these materials in aircraft construction is limited by the processing technology, which must be such as not to damage the material and not reduce its strength properties. Such technologies include processing by pressure with heating, when creep processes are activated and the material passes into a state close to superplasticity. The purpose of the work: assessment of the effect of pressure shaping of aluminum alloys Al-Cu-Li-Zn and Al-Zn-Mg-Cu in creep mode on strength. The paper investigates the influence of the technology of pressure shaping of aluminum alloys Al-Cu-Li-Zn and Al-Zn-Mg-Cu on the resistance to fatigue failure. The work uses a method that allows to determine the ultimate stresses using diagrams of the accumulation of irreversible deformations; method of forming thick plates (40 mm) in the creep mode. The previously selected optimum temperatures for forming the plates are used. A non-contact coordinate measuring system is used to perform surface inspection after shaping. Fractography of the fracture of samples of alloy Al-Cu-Li-Zn and Al-Zn-Mg-Cu after fatigue failure is performed. Mathematical modeling of the deformation process of plates in creep mode is carried out in the MSC.Marc package. As a result, a conservative evaluation of the endurance limit for aluminum alloys Al-Cu-Li-Zn and Al-Zn-Mg-Cu is obtained. The shaping of thick plates in the creep mode is carried out. More than 80% of the board surface is formed with a deviation of less than 1 mm from the target size. Fatigue tests of samples made of molded panels of alloys Al-Cu-Li-Zn and Al-Zn-Mg-Cu are carried out, fatigue curves are plotted. The fractography of the surface of the fatigue fracture showed the presence of oxides in the samples of alloy Al-Cu-Li-Zn, in contrast to alloy Al-Zn-Mg-Cu. The results of fatigue tests are discussed, showing that the characteristics of the technological process of shaping and heat treatment do not deteriorate the fatigue properties of the investigated alloys. Comparative tests show that alloy Al-Cu-Li-Zn has higher fatigue characteristics. Mathematical modeling show that the use of the Boyle-Norton steady-state creep law is not enough to describe the process of plate forming. The necessity of setting the inverse problem of creep age forming is noted, where the coordinates of the punches of the loading device should act as boundary conditions.

Evaluation of FSW on High Yield Strength Steels for Shipbuilding

2014 ◽  
Vol 783-786 ◽  
pp. 1776-1781 ◽  
Author(s):  
Guillaume Rückert ◽  
Myriam Chargy ◽  
François Cortial ◽  
François Jorez
Keyword(s):  
Yield Strength ◽  
Welding Process ◽  
Mechanical Tests ◽  
High Yield ◽  
High Yield Strength ◽  
Thick Plates ◽  
Butt Welds ◽  
Geometrical Defects ◽  
Non Destructive ◽  
Surface Testing

FSW process has been evaluated on three shipbuilding steels (DH36, S690QL and 80HLES steels) by fully penetrated butt welds on 8mm thick plates. Non destructive tests were carried out to highlight the presence of intrinsic defects known for the welding process (eg kissing bond). The validated inspection methodology (volume and surface testing) confirm the integrity of welds and the absence of geometrical defects for examinations and mechanical tests as part of a qualification procedure.

Hydrogen Response of 304 SS and Ti Weld Realised by Explosion

2014 ◽  
Vol 782 ◽  
pp. 166-171 ◽  
Author(s):  
Eva Mazancová ◽  
Dmytro Ostroushko
Keyword(s):  
Intermetallic Phase ◽  
Threshold Level ◽  
Fatigue Tests ◽  
Commercial Purity ◽  
Thick Plates ◽  
Fracture Surfaces ◽  
Heat Treated ◽  
Hydrogen Induced Cracking ◽  
Hydrogen Response

Welds of thick plates (304 SS) cladded with Ti of commercial purity both in as received state and subsequently heat treated (HT, 600°C/1.5 h/air), charged by hydrogen, were investigated after fatigue tests (tension-pressure) with amplitude of 20 Hz. Simultaneously, samples of above mentioned welds were also exposed in H2S in accord with NACE Standard TM0284-2011 to find hydrogen induced cracking (HIC) response. Charged welds after the HT showed by 15 MPa higher threshold level than the welds without the HT. The HIC tests generally demonstrated favourable results both after as weld state and after subsequent HT. Short and thin cracks were observed, exclusively located in intermetallic phase areas, where approx. 16-20 wt. % of Ti was revealed. Fracture surfaces of fatigue bars showed maximal failure in areas with 42-97 wt. % of Ti.

scholarly journals Fatigue Tests of Axially Loaded Butt Welds up to Very High Cycles

2013 ◽  
Vol 66 ◽  
pp. 88-97 ◽  
Author(s):  
P. Schaumann ◽  
S. Steppeler
Keyword(s):  
Fatigue Tests ◽  
Butt Welds ◽  
Axially Loaded ◽  
Very High

Fatigue Tests on Prestressed Concrete Beams Made With Debonded Strands

PCI Journal ◽  
1994 ◽  
Vol 39 (6) ◽  
pp. 70-88
Author(s):  
Bruce W. Russell ◽  
Ned H. Burns
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beams ◽  
Fatigue Tests

HIGH SPEED FATIGUE TESTS on SMALL SPECIMENS of PLAIN

PCI Journal ◽  
1959 ◽  
Vol 4 (2) ◽  
pp. 53-70 ◽  
Author(s):  
BASIL M. ASSIMACOPOULOS ◽  
ROBERT F. WARNER ◽  
CARL E. EKBERG, JR.
Keyword(s):  
High Speed ◽  
Fatigue Tests
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