Nondestructive Evaluation of Defects and Operating Damage in CFCC Combustor Liners

Sun, Jie; Erdman, S.; Russel, R.W.J.; Deemer, C.; Ellingson, W. A.; Miriyala, Narendernath; Kimmel, Josh; Price, Jeffrey R.

doi:10.1002/9780470294741.ch66

Cited by 2 publications

(7 citation statements)

References 4 publications

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“…This liner was subsequently installed in an operating engine. Borescope inspections of the engine at various time intervals showed that the EBC spalled off at the delamination region 23 . The liner with the delamination in Fig.…”

Section: Thermal Diffusivity Imaging Application For Cmcsmentioning

confidence: 91%

“…Figures 8a and b show thermal diffusivity images of sections of two melt‐infiltrated SiC/SiC CMC combustor liners 23,24 . A large delamination was detected on each of the liners.…”

Section: Thermal Diffusivity Imaging Application For Cmcsmentioning

confidence: 99%

“… Detection of delamination defects from thermal diffusivity data of (a) a Hi‐Nicalon/SiC melt‐infiltration (MI) liner 23 and (b) a Tyranno ZM/SiC–Si MI liner. 24 …”

Section: Thermal Diffusivity Imaging Application For Cmcsmentioning

confidence: 99%

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Evaluation of Ceramic Matrix Composites by Thermal Diffusivity Imaging

Sun¹

2007

Int J Applied Ceramic Tech

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Because of the complex structural design and multiple processing steps, ceramic matrix composites (CMCs) typically contain a variety of flaws distributed throughout the volume. These flaws need to be detected and characterized because they are detrimental to CMC material properties. Thermal diffusivity imaging is a nondestructive evaluation method that can quantitatively determine the thermal property of a CMC component. Thermal diffusivity is an intrinsic material property that not only depends on the material constituents but also on the micro‐ and macrostructure of the CMC component. This paper investigates fundamental theories for thermal diffusivity measurement using pulsed thermal imaging from two‐ and one‐sided setups. The variation of thermal diffusivity is examined for two types of flaws, voids and cracks, that are commonly present within CMCs. The sensitivity of thermal imaging to detect small and large flaws is analyzed and evaluated with measured thermal diffusivity data. In addition, analysis of fracture theories for the mechanical and thermal properties of materials with distributed microcracks has identified that thermal diffusivity may be used to determine the degradation of mechanical properties and, therefore, to predict the remaining life of a CMC component. Preliminary results for correlating thermal and mechanical properties are discussed.

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Section: Thermal Diffusivity Imaging Application For Cmcsmentioning

confidence: 91%

“…Figures 8a and b show thermal diffusivity images of sections of two melt‐infiltrated SiC/SiC CMC combustor liners 23,24 . A large delamination was detected on each of the liners.…”

Section: Thermal Diffusivity Imaging Application For Cmcsmentioning

confidence: 99%

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Evaluation of Ceramic Matrix Composites by Thermal Diffusivity Imaging

Sun¹

2007

Int J Applied Ceramic Tech

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“…[9][10][11] Therefore, nondestructive evaluation (NDE) is needed to play an important dual role in the development of these materials and in the evaluation and certification of components before and during use. [12][13][14][15][16][17] Among the advanced NDE methods, X-ray CT is broadly applicable to any material or test object through which a beam of penetrating radiation may be passed and detected, including metals, plastics, ceramics, metallic/nonmetallic composites, and assemblies. With the aid of the NDE methods, possible production defects such as delaminations, pores, and cavities, and so forth, as well as component conditions before and after testing can be detected.…”

Section: Introductionmentioning

confidence: 99%

“…6,[12][13][14] Currently, at Astrium, diverse standard procedures for the nondestructive testing of C/SiC components, such as thermography, X-ray technology, and ultrasonic technology, are in use. 16,17 The principal advantage of CT is that it provides densitometric (e.g., radiological density and geometry) and volumetric images of thin cross sections through an object. The focus and objective of this investigation is to prepare a so-called defect catalog that can serve as a reference for the application of the different methods.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Evaluation and Mechanical Characterization of a Defect‐Embedded Ceramic Matrix Composite Laminate

Mei

Cheng

et al. 2007

Int J Applied Ceramic Tech

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A C/SiC composite panel with defects of known size and of familiar nature was manufactured successfully for nondestructive evaluation. A computed tomography (CT) system was used to detect embedded defects. The results show that CT imaging corresponds well with the designed defects. The defect‐embedded composites undergo relatively greater loss in tensile strength and failure strain than the as‐received samples, although their initial Young's moduli are almost identical. It is also observed that the embedded defects make a significant contribution toward the initiation and accumulation of the damage in the composites, which result eventually in the early failure of the composite.

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Nondestructive Evaluation of Defects and Operating Damage in CFCC Combustor Liners

Cited by 2 publications

References 4 publications

Evaluation of Ceramic Matrix Composites by Thermal Diffusivity Imaging

Evaluation of Ceramic Matrix Composites by Thermal Diffusivity Imaging

Nondestructive Evaluation and Mechanical Characterization of a Defect‐Embedded Ceramic Matrix Composite Laminate

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