Fatigue Life Estimation Based on Continuum Mechanics Theory With Application of Genetic Algorithm

Kamal, Mohd; Rahman, Md. Mizanur

doi:10.15282/ijame.11.2015.45.0226

Cited by 10 publications

(11 citation statements)

References 25 publications

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“…The Miner's fatigue life summation rule is used to estimate the fatigue life of the wire ropes [18]. Classical fatigue analysis based on the equivalent nominal stress ranges with the Goodman and/or Gerber approach is employed for interpolation or extrapolation of fatigue behaviour with the axial mean stress effect [13,14,[19][20][21][22][23]. This classical method is a phenomenological approach based on the mean load over the net section area of the wire rope.…”

Section: Introductionmentioning

confidence: 99%

Methodology for reliability assessment of steel wire ropes under fretting fatigue conditions

Salleh¹,

Abdullah

Abdulhamid³

et al. 2017

J. MECH. ENG. SCI.

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This paper describes a newly-developed damage-based fatigue life model for the longterm reliability assessment of drawn steel wires and wire ropes. The methodology is based on the computed local stress field in the critical trellis contact zone of a stranded wire rope by FE simulations and the estimated fretting damage of the drawn wire material. A case study using a single strand (1x7) steel wire rope with 5.43 mm-dia. drawn wires is employed to demonstrate the damage-based fatigue life prediction procedures. Under applied tensile loading with peak stress corresponding to 50%MBL (P = 145 kN, R = 0.1), the von Mises stress cycles in-phase and with an identical stress ratio to the applied axial load. The damage initiation life at the trellis contact along the core wire is No = 673 cycles with an additional 589 load cycles to reach the first separation of the material point. The threshold load cycle for the fretting fatigue damage is predicted to be 12.3%MBL. An improved data set of the damage model parameters of the drawn steel wires is indispensable in achieving an accurate and validated life prediction model.

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Section: Introductionmentioning

confidence: 99%

Methodology for reliability assessment of steel wire ropes under fretting fatigue conditions

Salleh¹,

Abdullah

Abdulhamid³

et al. 2017

J. MECH. ENG. SCI.

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“…Such multiaxial loads and stress states are frequently encountered in many industries, including automotive, aerospace, and power generation, among others [5,17,24]. Research to develop new fatigue estimation models is continuously underway, but a general purpose model has still not been developed for the wide-ranging description of fatigue phenomena [4,[25][26][27][28]. This study is related to testing the performance of the new fatigue life estimation model based on a genetic algorithm in conjunction with the critical plane method and continuum damage mechanics.…”

Section: Introductionmentioning

confidence: 99%

Fatigue life prediction of titanium alloy for block loading using the hybrid approach of critical plane and continuum damage mechanics

Rahman¹,

Kamal²

2017

Int. J. Automot. Mech. Eng.

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The present study is related to the performance analysis of the newly proposed fatigue estimation model for titanium alloy BT9 against block loading. Lately, research efforts have been concentrated on developing the capability to handle complex multiaxial loading conditions for fatigue estimation. The current study is focused on testing the proposed hybrid approach involving the critical plane and continuum damage mechanics. The calibration of the proposed model is done by determining the model coefficients by using a genetic algorithm. Experimental fatigue lives for titanium alloy BT9 with block loading consisting of axial, torsion and out-of-phase axial-torsion loading segments are considered to analyse the accuracy of the proposed model. The proposed model is validated by using finite element analysis to estimate fatigue life for titanium alloy BT9. Simplifications were assumed to handle the block loads, and axial, torsion and out-ofphase loading conditions were used for calibration. The estimated fatigue life results show good agreement with published results for block loads.

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“…The FEM is widely used in analysing nuclear power plants [3][4][5], vehicles in automation or aircrafts [6,7] and for fatigue assessment [8][9][10]. However, existing FEM is still insufficient to analyse engineering problems due limitations related to complexity of problems and computation time [11][12][13][14]. Therefore, the S-version FEM was developed to enhance the existing FEM to overcome the constraints mentioned.…”

Section: Introductionmentioning

confidence: 99%

Prediction of fatigue crack growth for semi-elliptical surface cracks using S-version fem under tension loading

Shaari

Akramin

Ariffin³

et al. 2016

J. MECH. ENG. SCI.

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The finite element method (FEM) is commonly used is solving engineering problems including fatigue crack growth. The S-version FEM is an extended version of the FEM to predict fatigue crack growth. This method was developed into open-source software written in C/C++ language and built based on the UNIX operating system. The objective of this study is to perform a prediction for fatigue crack growth using the S-version FEM. This S-version FEM was structured using the global-local overlay technique that consisted of two separate meshes for global and local. Therefore, the computation process was solely focused on the local area instead of whole geometries. This undoubtedly reduced computation time and dependency on conventional FEM software. The geometry of the problem was modelled in FAST (pre-post) program and referred to as a global mesh, and the mesh was automatically generated in FAST. The location of the crack refers to the local mesh and at this stage smaller elements and finer mesh were made at the crack area. Local mesh was overlaid with global mesh. Then the global-local overlay approach was used to compute the engineering problem. The stress intensity factor (SIF) was calculated using the virtual crack closure-integral method (VCCM). The prediction of the fatigue crack growth results are shown in this study as well as the behaviour of the SIF corresponding to the crack growth. Analytical solutions were compared with the Sversion FEM to validate the results. A very good agreement was presented between the S-version FEM and analytical approach for the normalised SIF. In addition, regression analysis was performed to support the evidence. From the analysis, very small root mean square errors (RMSE) of 0.12 with high correlation coefficient (R 2 ) of 99.74% were shown to confirm the findings. From this study, it can be concluded that the S-version FEM is suitable to be used to predict fatigue crack growth for semi-elliptical surface cracks. The application of the S-version FEM benefits the user because using the overlay approach shortens the computation process.

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Fatigue Life Estimation Based on Continuum Mechanics Theory With Application of Genetic Algorithm

Cited by 10 publications

References 25 publications

Methodology for reliability assessment of steel wire ropes under fretting fatigue conditions

Methodology for reliability assessment of steel wire ropes under fretting fatigue conditions

Fatigue life prediction of titanium alloy for block loading using the hybrid approach of critical plane and continuum damage mechanics

Prediction of fatigue crack growth for semi-elliptical surface cracks using S-version fem under tension loading

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