Self-tightening round tube hoop tension testing device capable of keeping curvature of round tube

Abstract

The invention relates to a self-tightening round tube hoop tension testing device capable of keeping the curvature of a round tube. The self-tightening round tube hoop tension testing device comprisesa first separating disc, a second separating disc, a third separating disc and a fourth separating disc which are distributed along the circumferential direction of an inner ring of the round tube. Acylindrical structure matched with the inner wall surface of the round tube is formed by an outer ring obtained by splicing the first separating disc, the second separating disc, the third separatingdisc and the fourth separating disc; the first separating disc comprises a first clamping part opposite to the second separating disc; the second separating disc comprises a second clamping part opposite to the first separating disc; the first clamping part is matched with the third separating disc and the fourth separating disc; the second clamping part is matched with the third separating discand the fourth separating disc; and when the first separating disc is far away from the second separating disc, the third separating disc and the fourth separating disc are driven to move towards thecenter away from the round tube. The tension testing device is convenient to mount; during work, all the separating discs are self-tightened; and in the tension process, the curvature of the round tube is greatly kept, the influence of bending stress on the round tube is avoided, and further the accuracy is ensured.

Description

Technical field [0001] The invention relates to a material performance test device, and more specifically, to a self-tightening circular tube hoop tensile test device that maintains the curvature of the circular tube. Background technique [0002] Metal and composite ceramic material small-diameter thin-walled round tubes 1, such as nuclear reactor fuel rod cladding tubes, need to use jigs such as separating discs to perform tube ring tensile tests. [0003] The circumferential tensile strength of the circular tube 1 is defined as the circumferential strength of the circular tube 1 (also called Hoop strength). The hoop tensile strength can be accurately measured by the internal pressure method, but the internal pressure method requires a complicated test device and has certain risks. For the convenience of operation, the circular tube 1 hoop tensile test is generally carried out by the separate disc method , But the separation disc method cannot strictly stretch along the circumfe...

AI Technical Summary

Problems solved by technology

The hoop tensile strength can be accurately measured by the internal pressure method, but the test device required by the internal pressure method is complex and has certain risks. For the sake of convenience, the hoop tensile test of round pipe 1 is generally carried out by the separation disc method , but the separation disk method cannot strictly stretch the circular tube along the 1 circumferential direction, which will affect the accuracy of the measurement to a certain extent

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