Thermal Residual Stresses in Bonded Dissimilar Materials and Their Singularity.

Ioka, Seiji; Kubo, Shiro; Ohji, Kiyotsugu; Kishimoto, Jun-ichi

doi:10.1299/kikaia.60.1049

Cited by 4 publications

(3 citation statements)

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“…It should be noted that the non-singular term σ 0 should be eliminated. 7) It is known that the remaining singular term (σ y − σ 0 ) has a singularity of r 1 − λ expressed as Eq. (3).…”

Section: Analysis Methods For the Singularity Of Thermal Stressmentioning

confidence: 99%

Convenient Debonding Strength Evaluation for Spray Coating Based on Intensity of Singular Stress

Noda

Uchikoba

Ueno³

et al. 2015

ISIJ Int.

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Hearth rolls are used in continuous annealing furnace to produce thin steel sheet. The roll surface is usually coated by using thermal spraying, which has high adhesive strength and wears resistance. However, in the ceramics coating, thermal stress caused during heating and cooling process in the furnace may lead to debonding due to the low toughness of ceramics. In order to improve the heat resistance of the thermally sprayed coating, it is essential to evaluate the debonding strength. Generally, heat resistance of thermal spray coating is evaluated by thermal shock test prescribed by JIS H8304 although few research is available in terms of singular stress at the end of the interface for JIS specimen under thermal shock. This paper focuses on the intensity of the singular stress at the end of interface. Then, the most suitable conditions are discussed with varying the coating material and the coating thickness.

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Section: Analysis Methods For the Singularity Of Thermal Stressmentioning

confidence: 99%

Convenient Debonding Strength Evaluation for Spray Coating Based on Intensity of Singular Stress

Noda

Uchikoba

Ueno³

et al. 2015

ISIJ Int.

View full text Add to dashboard Cite

show abstract

“…Therefore, it is necessary to eliminate the non‐singular term. There is also another non‐singular term σ 0 caused by thermal stress . By eliminating the non‐singular terms σ 0 , and

\overset{σ_{r}}{true}

, the remaining singular term

σ_{y} - σ_{0} - {\tilde{σ}}_{r}

has a singularity of the form r 1– λ as shown in Equation .…”

Section: Axi‐symmetric Analysis Methods For the Intensity Of Singular mentioning

confidence: 99%

“…The problem of finite bonded plate subjected to tension shown in Figure b has been accurately calculated by using the body force method . Since the singular stress fields are similar if the material angles of two bonded structures are the same, then the stress intensity of unknown problem shown in Figure a can be determined by applying this known solution (Figure b) to Equation

\frac{K_{normalσ}}{K_{normalσ}^{*}} = \frac{F_{σ} σ_{0} W^{1 - λ}}{F_{σ} σ_{0}^{*} W^{1 - λ}} = \frac{σ_{r, F E M} - σ_{0} - {\tilde{σ}}_{r}}{σ_{y}^{F E M *}}

…”

Section: Axi‐symmetric Analysis Methods For the Intensity Of Singular mentioning

confidence: 99%

Optimum Design of Ceramic Spray Coating Evaluated in Terms of Intensity of Singular Stress Field

Wang

Noda

Ueno

et al. 2016

steel research int.

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Hearth rolls are the most important tools in continuous annealing line to produce thin steel sheet. Usually, the roll surface is coated by ceramics using thermal spraying. However, material mismatch and temperature change may cause thermal stress leading to the failure of the coating and deteriorating high adhesive strength and wears resistance. Therefore, it is very important to improve the debonding strength by optimizing the design of spray coating. The traditional method of evaluating the debonding strength of spray coating is prescribed as JIS H8304 thermal test. This paper focuses on the intensity of singular stress field (ISSF) at the end of interface since few research is available in terms of ISSF. Previously, the authors considered the JIS specimen assuming a plane strain. However, since the hearth roll is cylindrical and axi‐symmetric, the difference between plane strain and axi‐symmetric models should be clarified. Thus, in this paper, the axi‐symmetric model is newly considered and the optimum design is discussed by varying the coating material and the coating thickness. Also the present results are compared with the previous results of JIS specimen so that the difference between actual model and JIS specimen can be clarified to contribute the design and evaluation of the real rolls.

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Effects of surface geometry of composites on thermal stress distribution: a numerical study

Abedian¹,

Szyszkowski²,

Yannacopoulos³

1999

Composites Science and Technology

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Thermal Residual Stresses in Bonded Dissimilar Materials and Their Singularity.

Cited by 4 publications

References 0 publications

Convenient Debonding Strength Evaluation for Spray Coating Based on Intensity of Singular Stress

Convenient Debonding Strength Evaluation for Spray Coating Based on Intensity of Singular Stress

Optimum Design of Ceramic Spray Coating Evaluated in Terms of Intensity of Singular Stress Field

Effects of surface geometry of composites on thermal stress distribution: a numerical study

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