A Creep Constitutive Model, Based on Deformation Mechanisms and Its Application to Creep Crack Growth
In this paper, a constitutive model, based on the creep deformation mechanism in P91 steel, under a wide range of stress levels, was established and embedded into finite element software. The accuracy and reliability of the model was verified by comparing the simulation of uniaxial creep tensile tes...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-12-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/12/12/2179 |
| _version_ | 1797456351805308928 |
|---|---|
| author | Jingwei Zhang Jie Li Jingyi Zan Zijian Guo Kanglin Liu |
| author_facet | Jingwei Zhang Jie Li Jingyi Zan Zijian Guo Kanglin Liu |
| author_sort | Jingwei Zhang |
| collection | DOAJ |
| description | In this paper, a constitutive model, based on the creep deformation mechanism in P91 steel, under a wide range of stress levels, was established and embedded into finite element software. The accuracy and reliability of the model was verified by comparing the simulation of uniaxial creep tensile test results and the experimental data under different stress levels for P91 steel at 600 °C. The creep crack growth behavior of P91 steel, under a wide range of stress levels was simulated using a ductility-exhaustion-based damage model, combined with the stress-dependent creep ductility model, and the predicted creep crack growth (CCG) rates were compared with the experimental data. Finally, the established model was used to predict the CCG behavior for the pressurized pipes with axial surface cracks. The results show that the constitutive model, established on the basis of the creep deformation mechanism, agrees better with the experimental data than other constitutive models. The CCG rate varies at different direction angles <i>θ</i> for the axial surface cracks. The direction angle <i>θ</i> corresponding to the maximum creep crack length is about 33°, when the internal pressure exceeds 10 MPa. The initial crack shape (<i>a</i><sub>0</sub>/<i>c</i><sub>0</sub>) = 1, and it does not change with different initial crack depth ratios (<i>a</i><sub>0</sub>/<i>t</i>). The established constitutive model can be well used in CCG life analyses and designs of high-temperature structures. |
| first_indexed | 2024-03-09T16:05:34Z |
| format | Article |
| id | doaj.art-d3572b4abc494074a222ae20dd1c9746 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T16:05:34Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-d3572b4abc494074a222ae20dd1c97462023-11-24T16:42:15ZengMDPI AGMetals2075-47012022-12-011212217910.3390/met12122179A Creep Constitutive Model, Based on Deformation Mechanisms and Its Application to Creep Crack GrowthJingwei Zhang0Jie Li1Jingyi Zan2Zijian Guo3Kanglin Liu4College of Chemical Engineering, Fuzhou University, Fuzhou 350108, ChinaCollege of Chemical Engineering, Fuzhou University, Fuzhou 350108, ChinaXiamen ABB Low Voltage Electrical Equipment Company, Xiamen 361000, ChinaCollege of Chemical Engineering, Fuzhou University, Fuzhou 350108, ChinaCollege of Chemical Engineering, Fuzhou University, Fuzhou 350108, ChinaIn this paper, a constitutive model, based on the creep deformation mechanism in P91 steel, under a wide range of stress levels, was established and embedded into finite element software. The accuracy and reliability of the model was verified by comparing the simulation of uniaxial creep tensile test results and the experimental data under different stress levels for P91 steel at 600 °C. The creep crack growth behavior of P91 steel, under a wide range of stress levels was simulated using a ductility-exhaustion-based damage model, combined with the stress-dependent creep ductility model, and the predicted creep crack growth (CCG) rates were compared with the experimental data. Finally, the established model was used to predict the CCG behavior for the pressurized pipes with axial surface cracks. The results show that the constitutive model, established on the basis of the creep deformation mechanism, agrees better with the experimental data than other constitutive models. The CCG rate varies at different direction angles <i>θ</i> for the axial surface cracks. The direction angle <i>θ</i> corresponding to the maximum creep crack length is about 33°, when the internal pressure exceeds 10 MPa. The initial crack shape (<i>a</i><sub>0</sub>/<i>c</i><sub>0</sub>) = 1, and it does not change with different initial crack depth ratios (<i>a</i><sub>0</sub>/<i>t</i>). The established constitutive model can be well used in CCG life analyses and designs of high-temperature structures.https://www.mdpi.com/2075-4701/12/12/2179creep crack growthcreep ductilitydeformation mechanismstress-dependentfinite element analysis |
| spellingShingle | Jingwei Zhang Jie Li Jingyi Zan Zijian Guo Kanglin Liu A Creep Constitutive Model, Based on Deformation Mechanisms and Its Application to Creep Crack Growth Metals creep crack growth creep ductility deformation mechanism stress-dependent finite element analysis |
| title | A Creep Constitutive Model, Based on Deformation Mechanisms and Its Application to Creep Crack Growth |
| title_full | A Creep Constitutive Model, Based on Deformation Mechanisms and Its Application to Creep Crack Growth |
| title_fullStr | A Creep Constitutive Model, Based on Deformation Mechanisms and Its Application to Creep Crack Growth |
| title_full_unstemmed | A Creep Constitutive Model, Based on Deformation Mechanisms and Its Application to Creep Crack Growth |
| title_short | A Creep Constitutive Model, Based on Deformation Mechanisms and Its Application to Creep Crack Growth |
| title_sort | creep constitutive model based on deformation mechanisms and its application to creep crack growth |
| topic | creep crack growth creep ductility deformation mechanism stress-dependent finite element analysis |
| url | https://www.mdpi.com/2075-4701/12/12/2179 |
| work_keys_str_mv | AT jingweizhang acreepconstitutivemodelbasedondeformationmechanismsanditsapplicationtocreepcrackgrowth AT jieli acreepconstitutivemodelbasedondeformationmechanismsanditsapplicationtocreepcrackgrowth AT jingyizan acreepconstitutivemodelbasedondeformationmechanismsanditsapplicationtocreepcrackgrowth AT zijianguo acreepconstitutivemodelbasedondeformationmechanismsanditsapplicationtocreepcrackgrowth AT kanglinliu acreepconstitutivemodelbasedondeformationmechanismsanditsapplicationtocreepcrackgrowth AT jingweizhang creepconstitutivemodelbasedondeformationmechanismsanditsapplicationtocreepcrackgrowth AT jieli creepconstitutivemodelbasedondeformationmechanismsanditsapplicationtocreepcrackgrowth AT jingyizan creepconstitutivemodelbasedondeformationmechanismsanditsapplicationtocreepcrackgrowth AT zijianguo creepconstitutivemodelbasedondeformationmechanismsanditsapplicationtocreepcrackgrowth AT kanglinliu creepconstitutivemodelbasedondeformationmechanismsanditsapplicationtocreepcrackgrowth |