A Comparative Study of Existing and Newly Proposed Models for Creep Deformation and Life Prediction of Si3N4

Ding, Jow‐Lian; Liu, KC; Brinkman, C.R.

doi:10.1520/stp12775s

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…Among those who studied this methodology was Jow-Lian Ding [53] who found that the results of the regression analyses indicated that the Minimum Commitment model fit the data slightly better than the Larson-Miller model. The reason was that this model has five independent variables whereas the Larson-Miller model has only two.…”

Section: Review Of the Minimum Commitment (Mc) Methodologymentioning

confidence: 99%

Creep Lifing Models and Techniques

Abdallah¹,

Perkins²,

Arnold³

2018

Creep

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The deformation of structural alloys presents problems for power plants and aerospace applications due to the demand for elevated temperatures for higher efficiencies and reductions in greenhouse gas emissions. The materials used in such applications experience harsh environments which may lead to deformation and failure of critical components. To avoid such catastrophic failures and also increase efficiency, future designs must utilise novel/improved alloy systems with enhanced temperature capability. In recognising this issue, a detailed understanding of creep is essential for the success of these designs by ensuring components that do not experience excessive deformation which may ultimately lead to failure. To achieve this, a variety of parametric methods have been developed to quantify creep and creep fracture in high temperature applications. This study reviews a number of well-known traditionally employed creep lifing methods with some more recent approaches also included. The first section of this paper focuses on predicting the long-term creep-rupture properties which is an area of interest for the power generation sector. The second section looks at pre-defined strains and the re-production of full creep curves based on available data which is pertinent to the aerospace industry where components are replaced before failure.

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Section: Review Of the Minimum Commitment (Mc) Methodologymentioning

confidence: 99%

Creep Lifing Models and Techniques

Abdallah¹,

Perkins²,

Arnold³

2018

Creep

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“…Among those who have studied this methodology was Jow-Lian Ding et al . [ 27 ] who found that the results of regression analyses indicated that the Minimum Commitment model fitted the creep data studied only slightly better than the Larson-Miller model regardless of the high number of constants.…”

Section: Approaches To Creep Life Predictionsmentioning

confidence: 99%

A Critical Analysis of the Conventionally Employed Creep Lifing Methods

et al. 2014

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The deformation of structural alloys presents problems for power plants and aerospace applications due to the demand for elevated temperatures for higher efficiencies and reductions in greenhouse gas emissions. The materials used in such applications experience harsh environments which may lead to deformation and failure of critical components. To avoid such catastrophic failures and also increase efficiency, future designs must utilise novel/improved alloy systems with enhanced temperature capability. In recognising this issue, a detailed understanding of creep is essential for the success of these designs by ensuring components do not experience excessive deformation which may ultimately lead to failure. To achieve this, a variety of parametric methods have been developed to quantify creep and creep fracture in high temperature applications. This study reviews a number of well-known traditionally employed creep lifing methods with some more recent approaches also included. The first section of this paper focuses on predicting the long-term creep rupture properties which is an area of interest for the power generation sector. The second section looks at pre-defined strains and the re-production of full creep curves based on available data which is pertinent to the aerospace industry where components are replaced before failure.

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“…A noted exception is the recent work by Ding et al (1994), as well as the work by White and Hazime (1995). Another exception is an article by Liu et al (1995) which is an extension of the work presented by Ding and coworkers.…”

Section: Introductionmentioning

confidence: 97%

A Viscoplastic Constitutive Theory for Monolithic Ceramics: I

Janosik

Duffy

1996

Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery

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This paper, which is the first of two in a series, provides an overview of a viscoplastic constitutive model that accounts for time-dependent material deformation (e.g., creep, stress relaxation, etc.) in monolithic ceramics. Using continuum principles of engineering mechanics the complete theory is derived from a scalar dissipative potential function first proposed by Robinson (1978), and later utilized by Duffy (1988). Derivations based on a flow potential function provide an assurance that the inelastic boundary value problem is well posed, and solutions obtained are unique. The specific formulation used here for the threshold function (a component of the flow potential function) was originally proposed by Willam and Warnke (1975) in order to formulate constitutive equations for time-independent classical plasticity behavior observed in cement and unreinforced concrete. Here constitutive equations formulated for the flow law (strain rate) and evolutionary law employ stress invariants to define the functional dependence on the Cauchy stress and a tensorial state variable. This particular formulation of the viscoplastic model exhibits a sensitivity to hydrostatic stress, and allows different behavior in tension and compression.

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A Comparative Study of Existing and Newly Proposed Models for Creep Deformation and Life Prediction of Si3N4

Cited by 7 publications

References 10 publications

Creep Lifing Models and Techniques

Creep Lifing Models and Techniques

A Critical Analysis of the Conventionally Employed Creep Lifing Methods

A Viscoplastic Constitutive Theory for Monolithic Ceramics: I

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