The invention provides a Bauschinger effect test fixture which is matched with a tension and compression material test machine for use to perform a Bauschinger effect test on a test piece. The test piece is of a symmetrical strip-shaped structure with two wide ends and a narrow middle, and comprises two identical split bodies. The split body comprises a base and a gland, wherein a limiting groovecorresponding to the half profile of the test piece is longitudinally formed from the middle part to one end of the base, and a plurality of threaded through holes are symmetrically formed in two sides of the limiting groove; and the gland is provided with two threaded through holes along the central axis, the test piece is pressed by a bolt, a plurality of through holes are symmetrically formed in the two sides of the gland, and the gland is connected with the plurality of threaded through holes of the base through bolts, a through groove is formed in one end, corresponding to the opening ofthe limiting groove, of the gland and is used for placing a stress ultrasonic detection probe on the test piece. The problem that the existing tension and compression material test machine cannot complete a Bauschinger effect test can be solved.

Bauschinger effect test fixture

The invention provides a testing device and a testing method for measuring axial stress of a bolt based on ultrasonic measurement. The testing device comprises a tensile testing machine and a high-lowtemperature testing box, and further comprises a stress measuring system and an ultrasonic measuring system. The stress measuring system comprises a strain gauge, a signal acquisition unit and a signal processing unit, and the strain gauge is adhered to a screw rod of a tested bolt. A detection probe of the ultrasonic measurement system is mounted at the end part of the measured bolt. The high-low temperature test box is used for placing a tensile testing machine and a tested bolt and adjusting the testing temperature. During testing, the tensile testing machine exerts pressure on a tested bolt, the pressure change piece pasted to the tested bolt deforms, and signals collected by the signal collection unit are output after being processed by the signal processing unit. And the ultrasonicmeasuring system measures and outputs a sound time difference signal of ultrasonic propagation in the bolt.

Testing device and testing method for measuring axial stress of bolt based on ultrasonic measurement

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Testing device and testing method for measuring axial stress of bolt based on ultrasonic measurement