Effects of Surface Roughness and Residual Stress on Fatigue Strength of Shot Blasted Ductile Cast Irons with Casting Surfaces

Yamabe, Junichiro; Kobayashi, M

doi:10.2472/jsms.55.301

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…The plastic deformation magnification of C6F45-1 is superior to that of C4F45-1. This result illustrates the effect of work hardening occurring in the shot brass and the uneven state of the surface to the wall thickness [6].…”

Section: Compression Test Resultsmentioning

confidence: 77%

Compression characteristics of spheroidal graphite cast iron pipe members

Yamaguchi¹,

Kimura

2014

WIT Transactions on the Built Environment

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Spheroidal graphite cast iron can be made with shape freedom, and can be used often in critical parts of automobiles and industrial machinery that are designed using the allowable stress design method. However, spheroidal graphite cast iron has been regarded as having low ductility deriving from fracture. It has therefore never been used for structural members for construction purposes. Previous studies have not clarified the plastic deformation capacity and ultimate strength of the spheroidal graphite cast iron members, even though the material properties were estimated using many experimentally obtained results.As described in this paper, compression tests were performed to investigate the plastic behavior of the spherical graphite cast iron members, and to assess the relation between the collapse mechanism and the width-to-thickness ratio. Tensile strength of samples corresponded to 700 N/mm 2 , 450 N/mm 2 , and 400 N/mm 2 . In addition, steel pipe material corresponding to 490 N/mm 2 was selected. Consequently, six specimens were used for the compression test. One was a steel pipe. The specimen diameters were 165.2 mm; the lengths were 450 mm, corresponding to approximately three times the diameter. The specimen thickness was 4 mm or 6 mm, with a width-to-thickness ratio of 41.3 or 27.5.The ultimate strength of spheroidal graphite cast iron pipe members is about twice the yield strength, even though the ultimate strength of the steel piles is equal to the yield strength. A crack was found on the pipe surface at the ultimate strength because the axial stress on the surface changes compression to tension by growing plate bending deformation of local buckling. Spheroidal graphite cast iron pipe members under compression loading exhibit brittle behavior after post local buckling.

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Section: Compression Test Resultsmentioning

confidence: 77%

Compression characteristics of spheroidal graphite cast iron pipe members

Yamaguchi¹,

Kimura

2014

WIT Transactions on the Built Environment

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“…It seems that the predicted fatigue limits are overestimated for specimens with/without shot blasting, which mirrors the unknown relation to the stress ratio and the local stress concentration induced by the presence of a hole. For the former relation, a correction by adding the stress ratio was considered by Yamabe et al [11]. For the latter relation, the stress concentration factor (K to ) is herein defined as the ratio of the maximum tensile stress (σ 1,max ) at the edge of the open hole to the stress that is located far from the hole (σ 0 ).…”

Section: Discussionmentioning

confidence: 99%

“…For common finishes of the machined parts studied herein, the factor a and exponent b can be given as 4.51 MPa and −0.265, respectively. Moreover, it is worthy of note that the effect of shot blasting has been taken into account in Equation (9) from the aspect of the improvement of the resultant hardness, which was deemed a primary parameter of the fatigue strength by Gerin et al [11]. The increase of compressive residual stress, on the other hand, is not considered for the sake of simplicity.…”

Section: Discussionmentioning

confidence: 99%

“…Although shot-blasting has been widely applied for different alloy materials before carrying coating to increase the adhesive strength, its beneficial effect on the fatigue strength improvement has still not been sufficiently understood. In qualifying such an effect, some simplified calculations for the fatigue strength were suggested by Yamabe et al [11]; however, the suitability of their application in the analysis of shot-blast steel plate with central hole details is still unknown.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Shot Blasting on Fatigue Strength of Q345B Steel Plate with a Central Hole

You

Wang

et al. 2017

Metals

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Abstract:The fatigue strength of Q345B steel plate with a central hole after shot blasting is studied herein. The improvement of fatigue strength related to the failure behavior is highlighted with due analysis of fatigue cracks initiation at the defect below the condensed surface induced by shot blasting. The effect of stress concentration is shown to be non-ignorable in the fatigue strength analysis. Codified fatigue categories in accordance with EN 1993-1-9 are used in drawing a comparison of studied fatigue behavior. Finally, an analytical model based on a modified reference model is proposed for the evaluation of the test fatigue strength results. It is demonstrated that the predicted results agree well with test data, since the stress ratio and the size of the defect as well as the stress concentration are appropriately considered.

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“…(1) to (7). The living probability F Sk =1-F fk is based on the obtained accumulated failure probability F fk .…”

Section: Stress σmentioning

confidence: 99%

Strength Evaluation of Alumina Spray Coating (5th Report, Consideration of the Strength in Sprayed Structure under Thermal Stress)

Aramaki

Hamada

Miyaji

et al. 2011

JMMP

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In this study, a fracture probability under a thermal stress distribution is calculated with a dangerous volume quantification method that was proposed in the former report. The fracture strength due to the thermal stress is calculated, based on the finite element method with the fracture temperature and the aluminum creep properties. The fracture strengths predicted with the proposed method are appropriate for the experimental results obtained by heat tests. The calculated dangerous volume intended for 90% of product in alumina spray coating on an aluminum layer is the part where a stress of 96% more than the maximum stress has been received. For the dangerous volume on thermal stress distribution, it is sufficient to consider an experienced dangerous volume in which the dangerous volume is a volume where a stress of 90% more than the maximum stress is loaded. It is shown that the fracture origin is located in the dangerous volume calculated by the present method and that the fracture strength predicted with a fracture origin size is almost equal to the fracture strength predicted by this study.

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Effects of Surface Roughness and Residual Stress on Fatigue Strength of Shot Blasted Ductile Cast Irons with Casting Surfaces

Cited by 8 publications

References 9 publications

Compression characteristics of spheroidal graphite cast iron pipe members

Compression characteristics of spheroidal graphite cast iron pipe members

Effect of Shot Blasting on Fatigue Strength of Q345B Steel Plate with a Central Hole

Strength Evaluation of Alumina Spray Coating (5th Report, Consideration of the Strength in Sprayed Structure under Thermal Stress)

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