Development of impact design methods for ceramic gas turbine componentsImpact damage prediction methods are being developed to aid in the design of ceramic gas turbine engine components with improved impact resistance. Two impact damage modes were characterized: local, near the impact site, and structural, usually fast fracture away from the impact site. Local damage to Si3N4 impacted by Si3N4 spherical projectiles consists of ring and/or radial cracks around the impact point. In a mechanistic model being developed, impact damage is characterized as microcrack nucleation and propagation. The extent of damage is measured as volume fraction of microcracks. Model capability is demonstrated by simulating late impact tests. Structural failure is caused by tensile stress during impact exceeding material strength. The EPIC3 code was successfully used to predict blade structural failures in different size particle impacts on radial and axial blades.
Document ID
19900055110
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Song, J. (Allied-Signal Aerospace Co. Phoenix, AZ, United States)
Cuccio, J. (Allied-Signal Aerospace Co. Phoenix, AZ, United States)
Kington, H. (Allied-Signal Aerospace Co., Garrett Auxiliary Power Div., Phoenix AZ, United States)