Influence of casting defects on the fatigue limit of nodular cast iron

Nadot, Y.; Méndez, J.; Ranganathan, N.

doi:10.1016/s0142-1123(03)00141-5

Cited by 92 publications

(59 citation statements)

References 12 publications

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“…Damage and fracture of DCI were exhaustively studied at ambient temperature, especially in the case of cyclically-loaded components [2][3][4]. The ductile fracture of DCI is usually explained in terms of nucleation, growth and coalescence of voids.…”

Section: Introductionmentioning

confidence: 99%

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Thuault

Hug

2015

Metals

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Tensile and compression tests were carried out on a ductile cast iron for temperatures up to 1073 K. The damage caused inside and around graphite nodules was evaluated as a function of the local equivalent plastic strain by using microstructural quantifications. The mechanical properties are strongly dependent on a temperature above 773 K. Concerning tensile behavior, an evolutional law issued from the Gurson model representing the void growth as a function of the deformation and temperature was successfully employed. It is demonstrated that the strain state and the temperature have a strong influence on the void growth function. In the case of compression tests, the temperature has a weak influence on the nodule deformation for temperatures lower than 773 K, and the mechanical behavior is driven by the viscoplastic properties of the ferrite. For higher temperatures, the mechanical properties in compression are progressively modified, since graphite nodules tend to remain spherical, and ferrite grains are severely deformed. A synthesis of the damage mechanisms is proposed in the studied range of temperature and plastic strain. It appears that the graphite nodule aspect ratio can be used OPEN ACCESSMetals 2015, 5 2352 as an indicator of the deformation under compression loading for temperatures ranging from room temperature to 673 K.

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Section: Introductionmentioning

confidence: 99%

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Thuault

Hug

2015

Metals

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“…Many researchers investigated the effect of casting defects on the fatigue strength and assessed the fatigue limit of ductile cast iron using matrix hardness such as Vickers hardness, HV. Nodat et al [1] and Shiota et al [2] reported that fatigue strength was decreased with the increase of the size of graphite particles and casting defects. Further, the distribution of graphite particles and casting defects affected the fatigue strength of ductile cast iron [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Fatigue limit prediction of ferritic-pearlitic ductile cast iron considering stress ratio and notch size

Deguchi

Kim

Ikeda³

2017

J. Phys.: Conf. Ser.

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Influence of mean stress on fatigue strength of ferritic-pearlite ductile cast iron with small defects T Deguchi, H J Kim, T Ikeda et al. Abstract. The mechanical behavior of ductile cast iron is governed by graphite particles and casting defects in the microstructures, which can significantly decrease the fatigue strength. In our previous study, the fatigue limit of ferritic-pearlitic ductile cast iron specimens with small defects ( area = 80 ~1500 m) could successfully be predicted based on the area parameter model by using area as a geometrical parameter of defect as well as the tensile strength as a material parameter. In addition, the fatigue limit for larger defects could be predicted based on the conventional fracture mechanics approach. In this study, rotating bending and tensioncompression fatigue tests with ferritic-pearlitic ductile cast iron containing circumferential sharp notches as well as smooth specimens were performed to investigate quantitatively the effects of defect. The notch depths ranged 10 ~ 2500 m and the notch root radii were 5 and 50 m. The stress ratios were R = 1 and 0.1. The microscopic observation of crack propagation near fatigue limit revealed that the fatigue limit was determined by the threshold condition for propagation of a small crack emanating from graphite particles. The fatigue limit could be successfully predicted as a function of R using a method proposed in this study.

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“…模，传统的裂纹观测手段如断面切割显微观测法、热着色法、标记法等 [3][4][5] 均为破坏性检测，测量到的也只是裂纹在试块横断面或纵断面上的投影，无法得到裂纹的三维形状。因此，在钢轨裂纹扩展预测中只能将裂纹的内部形状简化为半椭圆或半圆形 [6] 。实际上，真实裂纹处于钢轨表面的浅层范围，其形状会因轮轨接触应力、钢轨磨耗和廓形变化等的影响而发生变化。采用 X 射线断层扫描技术以微米级的量度来扫描裂纹内部三维形貌，已经应用于铝合金 [7][8] 、铸铁 [9][10] 等金属的裂纹检测和扩展分析中，并实现了对钢轨裂纹的测量 [11] 。因此，钢轨表面疲劳裂纹扩展的预测可以基于真实裂纹的形态展开。在裂纹扩展方面，考虑荷载反复作用下的三维有限元模型用于计算裂纹扩展应力强度因子、裂纹扩展参量如 J 积分等已经较为成熟。因此，本文采用 X 射线断层扫描对某重载铁路小半径曲线外轨轨距角-轨肩处的滚动接触疲劳裂纹进行测量，建立真实形态的裂纹模型；考虑裂纹尖端应力强度因子及其因扩展和磨耗的修正，提出了基于真实裂纹三维重构的钢轨滚动接触疲劳裂纹扩展预测方法，并预测 U75V 热处理钢轨的轨距角-轨肩疲劳裂纹的扩展情况。 1 疲劳裂纹扫描…”

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Prediction of the Rail Head Checks Propagation Based on Three Dimensional Reconstruction

Yu¹

2018

JME

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Influence of casting defects on the fatigue limit of nodular cast iron

Cited by 92 publications

References 12 publications

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Fatigue limit prediction of ferritic-pearlitic ductile cast iron considering stress ratio and notch size

Prediction of the Rail Head Checks Propagation Based on Three Dimensional Reconstruction

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