High Temperature Environmental Test Facility for Uniaxial Testing under CyclicLoading

摘要

A versatile test facility is described for the measurement of tensile.compressive, fracture toughness, mechanical fatigue, and thermomechanical fatigue properties of metals. intermetallics, ceramics, and composites at 25 to 200000 in vacuum, inert, and reducing atmospheres. The test system consists of a fully automated computer controlled axial load frame; a test chamber designed for interchangeable heating elements for different environments, grips for different types of loading and thermal histories, and ceramic rod extensometry. The facility overcomes a serious deficiency in test facilities and procedures to obtain material property data for the design of components subjected to high cycle fatigue loading conditions, thermomechanical fatigue. fatigue crack propagation in controlled atmospheres. The instrumentation fills the need to provide the designers with reliable and reproducible mechanical property data obtained under simulated loading conditions and operational environments. Damage tolerance concepts and predictive models that accurately reflect the combined effects of loading conditions and environmental species can be developed for qualification of mature and emerging high temperature materials for hypersonic high speed vehicle structures and advanced aircraft engines.