Crack Growth Behavior in Ti-Ni SMA Coil Spring under Cyclic Thermal and Extension Fatigue.

Mita, Toshihiro; Misumi, Masaaki; Ohkubo, Masafumi

doi:10.1299/kikaia.64.278

Cited by 1 publication

(9 citation statements)

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“…The results of each model are shown in Table 2. 59 The relative error expression of crack propagation residual life is…”

Section: Results Analysismentioning

confidence: 99%

“…Ma et al 58 studied the calculation method of the weight function of oblique crack and its influence on stress intensity factor. Mita et al 59 did not consider the influence of oblique cracks when calculating the stress intensity of springs. Therefore, this paper does not research this content.…”

Section: Fatigue Life Via Crack Closure Effect and Residual Stressmentioning

confidence: 99%

“…The values of the parameters

n^{'}

in the Walker model can be fitted by the experimental data of Mita et al 59 The fitted equation form is 39

y goodbreak= b_{0} goodbreak+ b_{1} x_{1} goodbreak+ b_{2} x_{2}

where

y

x_{1}

x_{2}

b_{0}

b_{1}

, and

b_{2}

are parameters of fitting.…”

Section: Case Analysismentioning

confidence: 99%

“…After calculation,

\frac{x}{a} \to 0

, the fatigue life of each model is different. The results of each model are shown in Table 2 59 …”

Section: Case Analysismentioning

confidence: 99%

“…The number of remaining cycles decreases with the increase in fatigue crack size. Take the Ti‐Ni SMA coil spring studied by Mita et al 59 as an example. The life of crack propagation stage at 60°C is selected as the comparative data.…”

Section: Case Analysismentioning

confidence: 99%

See 4 more Smart Citations

Fatigue life prediction of eccentric springs for the automobiles considering residual stress

Shi

Liu

Zhu

2023

Fatigue Fract Eng Mat Struct

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Springs are widely used in the automobile industry. They can produce large elastic deformation under the action of load. The fracture failure of springs will cause significant loss or maintenance costs. The fatigue life of springs is greatly affected by load eccentricity and residual stress. Some existing methods are not accurate enough to predict the life of springs. The cracked spring stresses are computed considering load eccentricity. Based on the Walker model, a method for predicting the spring fatigue life is proposed. The model combines the superposition principle and the closure effect, and it can consider residual stress, crack closure effect, and load eccentricity at the same time. The results demonstrate that the improved model has a better performance than the Walker model.

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“…The results of each model are shown in Table 2. 59 The relative error expression of crack propagation residual life is…”

Section: Results Analysismentioning

confidence: 99%

Section: Fatigue Life Via Crack Closure Effect and Residual Stressmentioning

confidence: 99%

“…The values of the parameters