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Authors: M. Phillips, K. McLaughlin, D. Ojeda, E. Luna, M. Burke, P. Cruz, K. Featherstone, E. Petersen, P.D. Ferro
Bending fatigue samples were plasma cut and water jet cut from sheets of 304 stainless. Samples were exposed to high pressure hydrogen (138 MPa at 300C for three weeks) or 1 atm hydrogen at room temperature for one week, or were unexposed. Preliminary results from bending fatigue testing show a decrease in fatigue life for hydrogen supersaturated samples.
Influence Of Long Term Ageing On Fatigue Crack Growth Behavior Of P91 Steel At Different Temperatures
Authors: M. Nani Babu, S. K. Swain, B. Shashank Dutt, S. Venugopal, G. Sasikala
Fatigue crack growth behavior (FCG) of Modified 9Cr-1Mo (P91) steel has been evaluated at 300, 653 and 823 K in normalized and tempered (unaged) and in subsequently aged at 823 K for 20000 h (aged) condition in both Paris and threshold regimes. The effects of test temperature and ageing on the FCG resistance of the material have been rationalized by examining the behavior using different measures of driving forces, namely, the applied and effective stress intensity factor ranges AK and AKeff, and the crack tip stress intensity factor range AKtip,ef that takes in to account the stress shielding effects also.
Multistage Strength Degradation In S25C Steel Under Torsional Cyclic Loading And Its Engineering Applications
Authors: Zihai Shi, Masaaki Nakano, Cuiping Liu
An experimental investigation on the fatigue mechanism of metal is reported. In this experimental study, multiple identical test specimens were first preloaded with torsional cyclic loads of increasing number of load cycles, and then tension tests were carried out to obtain their tensile strengths. The obtained test results presented strong experimental evidence for the existence of multistage strength degradation processes in metals under cyclic loading, and the strength degradation was clearly triggered by an abrupt change of cracking behaviour.
Authors: K. Manigandan, T.S. Srivatsan, G. Doll, and T. Quick
In this manuscript the results of a study aimed at understanding the extrinsic influence of test specimen orientation, with respect to wrought alloy steel plate, on high cycle fatigue properties and fracture behavior is highlighted. The alloy steel chosen was 300 M. Samples of this alloy steel prepared from both the longitudinal and transverse orientation were cyclically deformed over a range of maximum stress and the corresponding number of cycles to failure (NF) was recorded.
The Effects Of Pre-Straining Conditions On Austenite Stability During Fatigue Of Multiphase Trip Steels
Authors: Alexander L. Ly and Kip O. Findley
A multiphase TRIP780 steel was subjected to tensile pre-strains of 0, 5, and 15% at room temperature and at -20 °C. The pre-strained specimens were subjected to strain-controlled, fully reversed, axial fatigue testing at strain amplitudes ranging from 0.2 to 0.6%. The low-cycle fatigue life was largely independent of the pre-strain history.
Authors: Sulaiman Abdulkareem, A.T. Abdulrahim, S. I. Talabi and O. H. Amuda
This paper investigated the effect of heat treatment operations on the fatigue resistance of low carbon steel. Specimens after preparation for fatigue testing were subjected to annealing, normalizing and quenching heat treatment. Results show that the annealed specimen had the largest number of cycles to failure, indicating a high fatigue resistance.
Authors: J. Toribio, V. Kharin
Plasticity-induced crack closure (PICC) has long been focused as supposedly controlling factor of fatigue crack growth (FCG). However, when the plane-strain near-tip constraint is approached, PICC lacks of straightforward evidence, so that its significance in FCG, and even the very existence, remain debatable. To add insights into this matter, large-deformation elastoplastic simulations of plane-strain crack under constant amplitude load cycling at different load ranges and ratios, as well as with an overload, have been performed.
Authors: Salas-Zamarripa, A., Pinna, C., Brown, M.W., Guerrero-Mata, M. P., Castillo Morales, M. and Ledezma-Ramirez, D.F.
Fatigue tests at both room and elevated temperature (230°C) were carried out to understand the fatigue behavior of the 2618-T6 under such conditions. SEM fractography was performed in the fracture surfaces and a considerable amount of ductile intergranular fracture was found. A methodology based on stereophotogrammetry was developed to quantify the percentage of these areas on the fracture surfaces.
Authors: J. Toribio, J.C. Matos, B. Gonzalez
This paper analyzes the propagation of fatigue cracks in pearlitic steel supplied in two forms, hot rolled bar and prestressing steel wire. The experimental procedure consisted of fatigue tests on cylindrical bars under tensile loading, using steps with decreasing amplitude of stress intensity factor and constant stress intensity range during each step.
Authors: J. Toribio, J.C. Matos, B. Gonzalez, J. Escuadra
The aim of this paper is the numerical prediction of the cracking path followed by a surface crack front in plates constituted of different materials (determined by the exponent m of the Paris law), subjected to cyclic tension or cyclic bending loading.