scholarly journals Influence of Laser Peening Treatment on High-Cycle Fatigue Properties of Degassing Processed AC4CH Aluminum Alloy

2006 ◽  
Vol 55 (7) ◽  
pp. 706-711 ◽  
Author(s):  
Kiyotaka MASAKI ◽  
Yasuo OCHI ◽  
Youhei KUMAGAI ◽  
Takashi MATSUMURA ◽  
Yuji SANO ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
High Cycle Fatigue ◽  
Fatigue Properties ◽  
Laser Peening ◽  
Cycle Fatigue

Crystal Plasticity Modeling of Laser Peening Effects on Tensile and High Cycle Fatigue Properties of 2024-T351 Aluminum Alloy

2021 ◽  
Vol 143 (7) ◽  
Author(s):  
Maziar Toursangsaraki ◽  
Huamiao Wang ◽  
Yongxiang Hu ◽  
Dhandapanik Karthik
Keyword(s):  
Residual Stresses ◽  
Crystal Plasticity ◽  
High Cycle Fatigue ◽  
Driving Forces ◽  
Crack Nucleation ◽  
Fatigue Properties ◽  
Laser Peening ◽  
Cycle Fatigue ◽  
Fatigue Crack Nucleation ◽  
Near Surface

Abstract This study aims to model the effects of multiple laser peening (LP) on the mechanical properties of AA2024-T351 by including the material microstructure and residual stresses using the crystal plasticity finite element method (CPFEM). In this approach, the LP-induced compressive residual stress distribution is modeled through the insertion of the Eigenstrains as a function of depth, which is calibrated by the X-ray measured residual stresses. The simulated enhancement in the tensile properties after LP, caused by the formation of a near-surface work-hardened layer, fits the experimentally obtained tensile curves. The model calculated fatigue indicator parameters (FIPs) under the following cyclic loading application show a decrease in the near-surface driving forces for the crystal slip deformation after the insertion of the Eigenstrains. This leads to a higher high cycle fatigue (HCF) resistance and the possible transformation of sensitive locations for fatigue failure further to the depth after LP. Experimental observations on the enhancement in the HCF life, along with the relocation of fatigue crack nucleation sites further to the depth, reveal the improvement in the HCF properties due to the LP process and validate the numerical approach.

Effects of Laser Peening on high cycle fatigue properties on SUS316L

2003 ◽  
Vol 2003 (0) ◽  
pp. 283-284 ◽  
Author(s):  
Yutaka Wakabayashi ◽  
Kiyotaka Masaki ◽  
Yasuo Ochi ◽  
Takashi Matumura ◽  
Yuji Sano ◽  
...  
Keyword(s):  
High Cycle Fatigue ◽  
Fatigue Properties ◽  
Laser Peening ◽  
Cycle Fatigue

Effect of the Rheocasting Process and of the SLS Layer on the Fatigue Behavior of 357 Aluminum Alloy

2014 ◽  
Vol 217-218 ◽  
pp. 227-234 ◽  
Author(s):  
Alain Abou Antoun ◽  
Myriam Brochu ◽  
Heinrich Möller
Keyword(s):  
Aluminum Alloy ◽  
Crack Initiation ◽  
High Cycle Fatigue ◽  
Fatigue Behavior ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Initiation Mechanism ◽  
Liquid Segregation ◽  
Surface Liquid ◽  
Effect Of Surface

Two objectives were targeted: 1) compare the high cycle fatigue behavior of rheocast aluminum alloy 357 prepared by the swirl enthalpy equilibration device (SEED) and by the Council for Scientific and Industrial Research (CSIR) process, and 2) study the effect of surface liquid segregation (SLS) on the fatigue behavior of the CSIR material. Rectangular hourglass specimens machined from rheocast plates were tested at four stress amplitudes in axial fatigue with a stress ratio of R = -1 and a frequency of 20 Hz. Results obtained for SLS free specimens show that the SEED and the CSIR processes produce rheocast materials with comparable high cycle fatigue properties, 115 MPa at 107 cycles. In order to study the influence of surface liquid segregation, slightly polished specimens with a remaining SLS of nearly 750 microns thick were also tested. According to the results, the SLS reduces the average fatigue strength by approximately 5% (110 MPa vs. 115 MPa at 107 cycles). For SLS free specimens, the fatigue crack initiated at shrinkage cavities, oxide films or in the alpha globules. On the other hand, for specimens with SLS, no crack initiation in the alpha globules was observed. The main crack initiation mechanism was identified to be a deformation incompatibility between regions characterized by higher silicon content compared to nominal eutectic regions. The originality of the work is provided by the rigorous comparative analysis of the fatigue performance of components produced in two different rheocasting facilities, but tested in a single laboratory. It is also the first fundamental research published on the mechanical effect of surface liquid segregation. It confirms that SLS should be removed in critical areas in order to optimize the fatigue resistance of rheocast components.

scholarly journals Influence of Shot Peening Treatment on High-Cycle Fatigue Properties of Degassing Processed AC4CH Aluminum Alloy

2005 ◽  
Vol 54 (12) ◽  
pp. 1255-1261 ◽  
Author(s):  
Kiyotaka MASAKI ◽  
Youhei KUMAGAI ◽  
Yasuo OCHI ◽  
Takashi MATSUMURA ◽  
Tatsuhiko HAMAGUCHI
Keyword(s):  
Aluminum Alloy ◽  
Shot Peening ◽  
High Cycle Fatigue ◽  
Fatigue Properties ◽  
Cycle Fatigue

Verification of the Fatigue Test Method Applied with the Use of Mini Specimen

2014 ◽  
Vol 598 ◽  
pp. 243-248 ◽  
Author(s):  
Tomasz Tomaszewski ◽  
Janusz Sempruch
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Test ◽  
High Cycle Fatigue ◽  
Fatigue Testing ◽  
Construction Material ◽  
Test Method ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Testing Methodology ◽  
Standard Specimens

In special situations the fatigue properties of the construction material can be determined using non-standard specimens, for example smaller than the normative ones (the so-called mini specimens). The research presented was made for the aluminum alloy based on the high-cycle fatigue testing methodology. The verification was made by breaking down the results with own tests which involved the use of standard specimens and stands as well as with the literature reports.

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