Multiaxial high-cycle fatigue criteria and life prediction: Application to gas turbine blade

et al. 2017

Materials

As one of fracture critical components of an aircraft engine, accurate life prediction of a turbine blade to disk attachment is significant for ensuring the engine structural integrity and reliability. Fatigue failure of a turbine blade is often caused under multiaxial cyclic loadings at high temperatures. In this paper, considering different failure types, a new energy-critical plane damage parameter is proposed for multiaxial fatigue life prediction, and no extra fitted material constants will be needed for practical applications. Moreover, three multiaxial models with maximum damage parameters on the critical plane are evaluated under tension-compression and tension-torsion loadings. Experimental data of GH4169 under proportional and non-proportional fatigue loadings and a case study of a turbine disk-blade contact system are introduced for model validation. Results show that model predictions by Wang-Brown (WB) and Fatemi-Socie (FS) models with maximum damage parameters are conservative and acceptable. For the turbine disk-blade contact system, both of the proposed damage parameters and Smith-Watson-Topper (SWT) model show reasonably acceptable correlations with its field number of flight cycles. However, life estimations of the turbine blade reveal that the definition of the maximum damage parameter is not reasonable for the WB model but effective for both the FS and SWT models.

Section: Experimental Validationsupporting

confidence: 84%

“…The majority of the considered material properties can be derived from the tension-compression uniaxial fatigue data [ 50 , 51 ]. When the constants of torsion fatigue are not available, they can be estimated from the corresponding uniaxial fatigue constants by using von Mises’s criterion, as suggested by [ 52 ]:

…”

Section: Experimental Validationmentioning

confidence: 99%

A New Energy-Critical Plane Damage Parameter for Multiaxial Fatigue Life Prediction of Turbine Blades

Zhu

et al. 2017

Materials

“…Due to the mass of the compressor turbine discs and blades, coupled with constrains of bolt in the circumferential direction, a stress concentration occurs at the edge of assembly holes. Maktouf et al (2016) pointed out that design engineers should not rely only on the region with maximum von Mises stresses. It is acknowledged that the fatigue DP is closely related to cyclic plastic deformation especially for energy-and strain-based models (Foletti et al, 2014;Qian et al, 2018aQian et al, , 2018bWang et al, 2014;Wu et al, 2014;Xu et al, 2018).…”

Section: Model Application For a Compressor Turbine Discmentioning

confidence: 99%

Strain energy-based multiaxial fatigue life prediction under normal/shear stress interaction

Zhu

International Journal of Damage Mechanics

et al. 2018

Through characterizing the interaction of normal/shear stress–strain behavior on material planes of TC4 alloys, a new strain energy critical plane model describing mean stress effects is proposed for life prediction under tension–compression, pure torsion, and tension–torsion loadings. Moreover, a modified Ince–Glinka model is elaborated through considering crack surface close to the maximum shear strain plane. Three simple solutions are presented to determine cracking failure mode using the concepts of life, damage, and strain. Comparing with lifing models of Liu, Smith–Watson–Topper, and modified Ince–Glinka, the proposed model provides more accurate life predictions for TC4 and a compressor turbine disc by full-scale fatigue testing.

“…Hence, an explicit FE modelling study of the rail clip component subject to dynamic wheel-on-rail loading can be investigated with multiaxial high-cycle fatigue criteria for assessing the fatigue life expectancy. 12 In this study, to gain a deeper understanding of rail clips failure behaviour, FE models of E-clip and Fast-clip components were integrated to a rail track structural model using the ABAQUS FE software. 13 The stresses and strains obtained from the FE simulation results were integrated into a multiaxial fatigue model in order to reduce the complex stress-strain states to a uniaxial fatigue damage parameter.…”

Section: Introductionmentioning

confidence: 99%

Finite element and experimental study on multiaxial fatigue analysis of rail clip failures

Tsang

Fatigue Fract Eng Mat Struct

et al. 2020

The rail clip fastening system is an important structural component of railway track systems providing flexibility and turnover resistance for running rails. High replacement frequency of fasteners was observed compared with other components because of fatigue failures of rail clips. In this study, implicit and explicit finite element (FE) models were developed for E‐clip and Fast‐clip with material and fatigue properties obtained from experimental testing. The fatigue loading experiments were conducted to determine the strain‐life relationship. The assessments of the fatigue damage and fatigue life were analysed using the FE results for the rail clip strain/stress components with the Fatemi‐Socie multiaxial fatigue criterion. A time‐efficient smallest enclosing circle algorithm was developed to search the critical plane orientation and the maximum shear strain amplitude for fatigue analysis. This work provides a method for FE and experimental study of multiaxial fatigue analysis of rail clip failures subjected to dynamic loading.