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

scholarly journals The Effect of the Microstructure and Defects on Crack Initiation in 316L Stainless Steel under Multiaxial High Cycle Fatigue

2014 ◽  
Vol 891-892 ◽  
pp. 815-820 ◽  
Author(s):  
Raphaël Guerchais ◽  
Franck Morel ◽  
Nicolas Saintier
Keyword(s):  
Stainless Steel ◽  
Fatigue Crack ◽  
Crack Initiation ◽  
High Cycle Fatigue ◽  
Driving Forces ◽  
Numerical Models ◽  
Fatigue Crack Initiation ◽  
Defect Size ◽  
Cycle Fatigue ◽  
Fatigue Crack Nucleation

The aim of this study is to analyse the influence of both the microstructure and defects on the high cycle fatigue behaviour of the 316L austenitic stainless steel, using finite element simulations of polycrystalline aggregates. High cycle fatigue tests have been conducted on this steel under uniaxial (push-pull) and multiaxial (combined in-phase tension and torsion) loading conditions, with both smooth specimens and specimens containing artificial semi-spherical surface defects. 2D numerical models, using a cubic elastic constitutive model, are created to determine the degree of heterogeneity of the local stress parameters as a function of the defect size. This has been done for one microstructure using several orientation sets generated from the initial texture of the material. The grains are explicitly modelled and the anisotropic behaviour of each FCC crystal is described by the generalized Hookes law with a cubic elasticity tensor. From the simulations carried out with different defect sizes and orientation sets that are representative of the real texture of the tested material, statistical information regarding mesoscopic mechanical fields provides useful insight into the microstructural dependence of the driving forces for fatigue crack nucleation at the mesoscopic scale (or the scale of individual grains). The results in terms of the stress fields and fatigue crack initiation conditions are determined at both the mesoscopic and macroscopic scales. The results from these FE models are used along with an original probabilistic mesomechanics approach to quantify the defect size effect. The resulting predictions, which are sensitive to the microstructure, include the probability distribution of the high cycle fatigue strength.

scholarly journals Effect of Microstructure on the High-Cycle Fatigue Behavior of Ti(43-44)Al4Nb1Mo (TNM) Alloys

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1043
Author(s):  
Bin Tang ◽  
Bin Zhu ◽  
Weiqing Bi ◽  
Yan Liu ◽  
Jinshan Li
Keyword(s):  
Crack Initiation ◽  
High Cycle Fatigue ◽  
Crack Nucleation ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Subsurface Crack ◽  
Tial Alloys ◽  
Fracture Morphologies

To investigate the high-cycle fatigue (HCF) behavior of TNM alloys, three different microstructures were designed and obtained by different heat treatments. Staircase tests and fatigue tests in a finite life-region were performed to evaluate the fatigue properties. Then, the fracture surfaces were analyzed to study the fracture behavior of TNM alloys with different microstructures. Results showed that the TNM alloys with duplex microstructure possesses the highest fatigue strength and fatigue life, followed by near lamellar TiAl alloys. HCF failure exhibited cleavage fracture morphologies, and multiple facets were generated in the crack initiation region of different TNM alloys. Two different crack initiation modes, subsurface crack nucleation and surface origin, were observed. Both crack initiation modes appeared in near lamellar alloys, while only subsurface crack initiation were obtained in the duplex (DP) alloy. It contributes to the high scatter of S-N data. The HCF failure of TNM alloys was dominated by crack nucleation rather than crack propagation. These findings could provide guidance for optimizing the microstructure and improving the HCF properties of TiAl alloys.

scholarly journals Surface Characteristics and High Cycle Fatigue Performance of Shot Peened Magnesium Alloy ZK60

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Jie Dong ◽  
Wencai Liu ◽  
Wenjiang Ding ◽  
Jianxin Zou
Keyword(s):  
Magnesium Alloy ◽  
Shot Peening ◽  
High Cycle Fatigue ◽  
Crack Nucleation ◽  
Surface Characteristics ◽  
Fatigue Performance ◽  
Cycle Fatigue ◽  
Fatigue Crack Nucleation ◽  
Zk60 Alloy ◽  
Zk60 Magnesium Alloy

The current work investigated the effect of shot peening (SP) on high cycle fatigue (HCF) behavior of the hot-extruded ZK60 magnesium alloy. SP can significantly improve the fatigue life of the ZK60 alloy. After SP at the optimum Almen intensities, the fatigue strength at 107 cycles in the as-extruded (referred to as ZK60) and the T5 aging-treated (referred to as ZK60-T5) alloys increased from 140 and 150 MPa to 180 and 195 MPa, respectively. SP led to a subsurface fatigue crack nucleation in both ZK60 and ZK60-T5 alloys. The mechanism by which the compressive residual stress induced by shot peening results in the improvement of fatigue performance for ZK60 and ZK60-T5 alloys was discussed.

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
Sign in / Sign up

Export Citation Format

Share Document