Fatigue life prediction under variable loading based on a new damage model devoted for defective material

Saggar, Maroua; Sallem, Haifa; Bouraoui, Chokri

doi:10.1007/s00170-017-1198-9

Cited by 8 publications

(13 citation statements)

References 16 publications

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“…According to the S-N curve and the constant life curve of material, the two-parameter nominal stress equation including the average stress S m , the stress amplitude S a , and the fatigue life N can be deduced as follows [12][13].…”

Section: Two-parameter Nominal Stress Modelmentioning

confidence: 99%

“…Thus, the average stress and stress amplitude should be considered for the fatigue strength analysis. According to the two-parameter nominal stress Formula (12) and Formula (13), the fatigue damage of the impeller under the cyclic load at certain stress level (S a , S m ) can be directly calculated.…”

Section: Miner Cumulative Fatigue Damage Modelmentioning

confidence: 99%

“…Considering some factors that affect the fatigue strength of the impeller, takes K S = 1.2, ε S = 0.91, β = 0.85, and φ S = 0.1 [15]. Then, the Goodman-type two-parameter nominal stress fatigue life of the impeller can be solved as follows according to Equation (12). According to Figure 7, the stress amplitude S a , the mean stress S m , and the stress ratio r at the impeller's dangerous section can be obtained.…”

Section: Fatigue Prediction For the Throwing Impellermentioning

confidence: 99%

“…According to Figure 7, the stress amplitude S a , the mean stress S m , and the stress ratio r at the impeller's dangerous section can be obtained. When the throwing impeller's reliability P is 50%, 90%, and 99%, its fatigue life at 1500r/min can be calculated respectively in Table 1 according to Formulas (12), (13), and (15). In order to evaluate the estimation accuracy of the two-parameter nominal stress model, its fatigue life prediction results are compared with those of the conventional S-N curve as well as the rating lives of the impeller in Table 1.…”

Section: Fatigue Prediction For the Throwing Impellermentioning

confidence: 99%

“…Pavlou [11] presented a new theory for macroscopic fatigue damage estimation based on the S-N curve, which was a generalization of most of the existing fatigue damage models. Saggar [12] presented a fatigue damage cumulative model under the variable load devoted for defective materials. This model was connected cycle by cycle with the S-N curve, and it also took into account the loading history.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue Life Prediction for Throwing Impeller of an Impeller Blower

Zhai¹,

Can²,

Cui³

et al. 2019

IJPE

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Impeller blowers are used to convey materials for various forage harvesters. As the main working component, the throwing impeller endures various static and dynamic loads while conveying the materials. This makes the throwing impeller prone to fatigue fracture, so it is very necessary to find a feasible model to estimate the fatigue life of the throwing impeller accurately. In order to obtain the accurate random cyclic load applied on the high-speed rotating impeller, the finite element analysis and the fluid-solid coupling method are adopted to calculate the stress distribution of the impeller under the combined action of the fluid-solid coupling flow field pressure, the centrifugal force, and the gravity. At the same time, the stress on the dangerous section of the impeller is measured by using the DH5909 wireless strain testing system and is compared with the calculated one. The contrast results show that the numerical calculation results are reliable. To accurately predict the fatigue life of the throwing impeller at the design stage, the two-parameter nominal stress model is deduced and combined with the linear cumulative damage model of Miner and the lognormal distribution model. Its two parameters of the average stress S m and the stress amplitude S a can be obtained through finite element analysis and do not have to be equivalent to a symmetrical cyclic load. Therefore, its precision of estimating the fatigue life is improved. By contrasting the rated and predicted fatigue lives of an impeller, it was found that the impeller's actual rated lives are closer to the predicted lives of the Goodman and Gerber twoparameter nominal stress model than those of the conventional S-N curve. In particular, they are closer to the calculation results of the Gerber-type two-parameter nominal stress model. This shows that the Gerber-type two-parameter nominal stress model is more accurate and suitable to predict the fatigue life of the throwing impeller. These achievements will play a significant role in further optimizing the impeller and improving its reliability.

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Section: Two-parameter Nominal Stress Modelmentioning

confidence: 99%

Section: Miner Cumulative Fatigue Damage Modelmentioning

confidence: 99%

Section: Fatigue Prediction For the Throwing Impellermentioning

confidence: 99%

Section: Fatigue Prediction For the Throwing Impellermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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