An ultrasonic positioning method for the core of a sic fiber reinforced ti-matrix composite ring

Abstract

The invention discloses an ultrasonic positioning method of a SiC fiber reinforced Ti-base composite material ring piece core, and belongs to the technical field of preparation and detection of a composite material. A SiC fiber reinforced Ti-base composite material ring piece has a sandwiched structure and consists of a composite material ring core and a peripheral Ti alloy outer sleeve. By utilizing a water leaching focusing ultrasonic detection method, firstly the accurate sound speed of ultrasonic waves in the composite material ring core and the Ti alloy outer sleeve is acquired by virtue of a measurement-aided calculation method, and then a distance from the surface of the ring piece to the core and the contour size of the ring piece core are measured by utilizing the sound speed, so that the ring piece core can be accurately positioned. By adopting the method, important significance on improving the machining quality of the SiC fiber reinforced Ti-base composite material ring piece and guaranteeing the safety application can be achieved.

Description

technical field [0001] The invention relates to the technical field of composite material preparation and detection, in particular to an ultrasonic positioning method for the core of a SiC fiber-reinforced Ti-based composite material ring for a novel aeroengine. Background technique [0002] SiC fiber reinforced Ti matrix composites (SiC f / Ti composites, TMCs) rings are increasingly becoming the key components of future high-thrust ratio aero-engines, and their good high-temperature specific strength, specific stiffness, creep resistance, and fatigue resistance make them able to meet the requirements of traditional titanium alloy disc forgings. Working conditions of high temperature and greater load. Affected by factors such as TMCs preparation technology, processing technology and engine design, the SiC fiber-reinforced Ti-based composite ring is a sandwich structure, including a TMCs core with a rectangular cross-section and a Ti alloy outer sheath around it. The TMCs c...

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Problems solved by technology

[0003] At present, the main method for locating the core of SiC fiber-reinforced Ti-based composite rings is the direct measurement method of the anatomical parts of the same process, but there are individual differences between the anatomical parts and the parts to be inspected, so there is still a deviation of 0.1mm in the positioning results , in addition, due to the high cost of SiC fiber reinforced Ti matrix composite rings, the cost of direct measurement of anatomical parts is very high

[0004] Traditional non-destructive testing methods, such as X-ray method and industrial CT method, can be used to image SiC fiber reinforced Ti-based composite rings, which can distinguish the core of TMCs from the surrounding Ti alloy outer sheath, but the boundary between the two is blurred and the image resolution is low. Insufficient positioning results cause the deviation of the positioning result to reach the order of 1mm, which has little significance for the processing quality of the control ring parts

Ultrasonic testing methods are mostly used for distance measurement and flaw detection of workpieces with a single material structure, but for multi-material composite structures with sandwich structures, especially SiC fiber reinforced Ti-based composite material rings, there is no accurate positioning of the core. Detection method

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