Method for testing compression performance of large-diameter thin-walled tube
A test method and technology for thin-walled tubes, which are applied in the direction of applying stable tension/pressure to test the strength of materials and preparation of test samples, which can solve the problems of instability and wrinkling of thin-walled tubes, large deformation, etc.
Active Publication Date: 2015-04-29
NORTHWESTERN POLYTECHNICAL UNIV
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[0004] In order to obtain the compression performance of large-diameter thin-walled pipes, the present invention proposes a test method suitable for the compression performance of large-diameter thin-walled pipes. This method can not only effectively solve the problems such as instability and wrinkling of thin-walled pipes during compression, Large deformation can be achieved, and compression performance tests at different temperatures can be carried out
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[0037]The invention is a method for testing the compressive performance of large-diameter thin-walled pipes. Now take the CP-3 pure titanium tube with a specification of Φ76.2×t1.07mm (outer diameter Φ×wall thickness t) as the object, and use this method to test the compression performance. The specific steps are as follows:
[0038] Step 1. Cut the arc-shaped sheet sample:
[0039] Take a section of the titanium tube to be tested, and cut about 70 arc-shaped sheet samples on the titanium tube by wire cutting method; the selected sample has no obvious gaps, and the inner and outer arc surfaces of the sample and the edges of each edge There are about 60 pieces of samples with high uniformity; according to the principle of determining the size of arc-shaped sheet samples, the axial length is 13mm, and the circumferential length is 11mm;
[0040] Step 2. Grinding the sample:
[0041] Wet the arc-shaped sheet-shaped sample, first use wet 400# coarse sandpaper to polish, and smoo...
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Abstract
The invention belongs to the field of material forming mechanics performance testing, and particularly relates to a method for testing compression performance of a large-diameter thin-walled tube. With the adoption of the method that an arc-shaped flaky sample cut from a thin-walled tube is machined into a block-shaped sample, the problems of unstability, wrinkling, small deformation, incapability of high-temperature compression performance testing and the like with a conventional compression test method are solved. Firstly, the arc-shaped flaky sample is cut from the to-be-tested thin-walled tube; then the sample is subjected to grounding and acid pickling to obtain a high-quality flaky sample; after the flaky sample is fixed preliminarily through laser welding, a diffusion welding die is designed to perform diffusion welding on the block-shaped sample; post processing such as grinding, polishing and the like is performed on the sample after diffusion welding to obtain the block-shaped sample which is applicable to compression performance testing of the large-diameter thin-walled tube; finally, the processed compression sample is directly put on a compression testing machine for a compression test, and accordingly, the compression mechanical performance of the large-diameter thin-walled tube is obtained.
Description
1. Technical field [0001] The invention belongs to the field of testing the mechanical properties of material forming, in particular to a testing method for the compression properties of large-diameter thin-walled pipes. 2. Background technology [0002] The development of high-end equipment in aviation, aerospace and other fields urgently requires the development of high-performance, lightweight, high-efficiency key components and their precise forming technology. Large-diameter thin-walled pipe fittings are a kind of key components of "blood vessels" with a large quantity and a wide range. Because they can meet the current high-end equipment manufacturing industry's high-performance, lightweight, high-strength and low-consumption requirements from both aspects of material and structure. Energy requirements, more and more widely used in many major strategic industries such as aviation, aerospace, automobiles and energy. However, this type of pipe often has to go through co...
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IPC IPC(8): G01N1/28G01N3/08
Inventor 李恒韩瑞杨合胡晓马俊陶智君
Owner NORTHWESTERN POLYTECHNICAL UNIV