Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for rapidly determining buckling strain capability of steel tube

A technology of strain capacity and steel pipe, which is applied in the production control field of high deformation capacity steel pipe, and can solve the problems of high cost of bending test of full-scale real pipe, inability to be used in production control, high complexity, etc.

Active Publication Date: 2010-12-22
BC P INC CHINA NAT PETROLEUM CORP +1
View PDF0 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of full-scale actual pipe bending test is too high to be used for production control test, and the high complexity of finite element calculation also prevents it from being used for production control

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for rapidly determining buckling strain capability of steel tube
  • Method for rapidly determining buckling strain capability of steel tube
  • Method for rapidly determining buckling strain capability of steel tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] The purpose of the present invention is to provide a method for quickly determining the buckling strain capacity of a pipeline steel pipe with an outer diameter of 1219 mm and a wall thickness of 22.0 mm, which avoids repeated full-scale actual pipe bending tests.

[0019] The method for quickly determining the buckling strain capacity of steel pipes uses the following steps:

[0020] 1) Take a longitudinal sample on the pipe body, and test to obtain the engineering stress-engineering strain curve;

[0021] Step 1) The specification of the longitudinal sample is 38.1 mm in inner width and 50.8 mm in gauge length.

[0022] Step 1) The stress value corresponding to the strain 2.0% on the curve is defined as R t2.0 , the stress value corresponding to a strain of 1.0% is R t1.0 , thus obtaining the required stress ratio parameter R t2.0 / R t1.0 .

[0023] Th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Outer diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a method for rapidly determining the buckling strain capability of a steel tube, belonging to the production control technical field of the high-deformability steel tube for a petroleum and gas pipeline. The method comprises the following steps: taking a longitudinal test piece from the tube, and then obtaining an engineering stress-engineering strain curve by a test; and calculating the critical buckling strain of the steel tube in a bending deformation mode according to a formula: epsiloncrit=15.963*Rt2.0 / Rt1.0-15.139, wherein, the critical buckling strain is average strain that a compression side of the test piece stretches towards two sides over a distance which is twice as long as the external diameter length of the steel tube with a buckled position as a center. The method can help rapidly determine the critical buckling strain of the steel tube in the bending deformation mode by controlling the tensile property of the pipeline steel tube, and can carry out performance control by a conventional production control test according to the stress ratio of the critical buckling strain level so as to produce the steel tube which can meet the requirement for the critical buckling strain level.

Description

technical field [0001] The invention belongs to the technical field of production control of high-deformation-capacity steel pipes for oil and gas pipelines, and relates to a method for quickly determining the buckling strain capacity of steel pipes. Background technique [0002] In general, the failure of the pipeline is the failure controlled by the load, and the design criterion based on the stress limit is adopted. The magnitude of the load cannot be controlled, and the deformation will only stop after the displacement reaches a certain level. At this time, the load is controlled by displacement or strain. In this case, simply using the stress limit criterion to design can no longer guarantee the safety of the pipeline, and the strain limit criterion must be used, that is, the design strain of the pipeline must be less than the allowable strain of the pipeline. On the one hand, the allowable strain of the pipeline is related to the geometric factors of the pipeline stee...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N3/00G01M13/00
Inventor 吉玲康陈宏远李为卫宫少涛
Owner BC P INC CHINA NAT PETROLEUM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com