Study on micro crack propagation mechanism of ferrite-pearlite gas transmission pipeline steel with lamellar structure

被引：9

作者：

Xu, Taolong ^{[1
]}

Wang, Wei ^{[1
,2
]}

Jiang, Hongye ^{[1
]}

He, Gongzhen ^{[1
,3
]}

机构：

[1] Southwest Petr Univ, Petr Engn Sch, Chengdu 610500, Sichuan, Peoples R China

[2] Guangzhou Urban Management Qual Monitoring & Emer, Guangzhou 510623, Guangdong, Peoples R China

[3] Sichuan East Gas Transmiss Sales Ctr Sinopec Nat, Wuhan 430074, Hubei, Peoples R China

来源：

SCIENTIFIC REPORTS | 2022年 / 12卷 / 01期

关键词：

MOLECULAR-DYNAMICS SIMULATION; DUCTILE FRACTURE INITIATION; PURE ALPHA-FE; DEFORMATION; SIZE; IRON; REPRESENTATION; POTENTIALS; INTERFACES; SCALE;

D O I：

10.1038/s41598-022-23405-4

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The deformation and failure characteristics of pipeline steel depend on its atomic structure and microstructure. Based on the serial multi-scale analysis technology, the ferrite/cementite (alpha-Fe/Fe3C) lamellar atomic structure with Bagaryatskii orientation relationship is established. In order to obtain the experimental sample of the lowest energy state, The step-by-step relaxation method of conjugate gradient energy minimization and constant temperature and constant pressure relaxation under NPT conditions is carried out, and the energy state and atomic structure of the relaxed samples are analyzed. For the models of different cementite terminal plane structures, the tension displacement curves on the propagation path of mode I central through crack are extracted respectively, combined with the bilinear cohesion zone model, The cohesion parameters at the atomic scale are successfully transferred from bottom to top to the macro and micro scales. By simulating the reaction force and displacement response law at the loading point, the critical fracture toughness of each terminal interface of ferrite-pearlite pipeline steel at different scales is calculated, which provides a reliable path for exploring the micro mechanism of macro cracking behavior of pipeline steel.

引用

页数：26

共 59 条

[41] PROCESS OF CRACK INITIATION AND EFFECTIVE GRAIN-SIZE FOR CLEAVAGE FRACTURE IN PEARLITIC EUTECTOID STEEL
PARK, YJ
BERNSTEIN, IM
[J]. METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1979, 10 (11): : 1653 - 1664
[42] DYNAMIC STUDIES OF TENSILE DEFORMATION AND FRACTURE OF PEARLITE
PORTER, DA
EASTERLING, KE
SMITH, GDW
[J]. ACTA METALLURGICA, 1978, 26 (09): : 1405 - 1422
[43] DISLOCATION NUCLEATION FROM A CRACK TIP - AN ANALYSIS BASED ON THE PEIERLS CONCEPT
RICE, JR
[J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 1992, 40 (02) : 239 - 271
[44] ROSENFIE.AR, 1968, ASM TRANS Q, V61, P807
[45] Song K.C., 2008, ABAQUS US C, P1
[46] Non-local separation constitutive laws for interfaces and their relation to nanoscale simulations
Spearot, DE
Jacob, KI
McDowell, DL
[J]. MECHANICS OF MATERIALS, 2004, 36 (09) : 825 - 847
[47] Taolong X., 2014, THESIS SICHUAN U
[48] An engineering solution for mesh size effects in the simulation of delamination using cohesive zone models
Turon, A.
Davila, C. G.
Camanho, P. P.
Costa, J.
[J]. ENGINEERING FRACTURE MECHANICS, 2007, 74 (10) : 1665 - 1682
[49] Wei W., 2021, THESIS SW PETROLEUM
[50] Pullout forces and friction in multiwall carbon nanotubes
Xia, Z
Curtin, WA
[J]. PHYSICAL REVIEW B, 2004, 69 (23) : 233408 - 1

← 1 2 3 4 5 6 →