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Finite Element Analysis of Creep Damage in Small Punch Test Specimen at Elevated Temperature

Author: YouYingJun
Tutor: LingXiang
School: Nanjing University of Technology
Course: Safety Technology and Engineering
Keywords: Creep damage Creep Finite Element Method A small punching creep test Damage Mechanics
CLC: TB302
Type: Master's thesis
Year: 2004
Downloads: 278
Quote: 9
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Abstract


Small punch creep test technology as a new test methods based on the \Most of the small punch creep tests of just qualitative analysis, quantitative research is less rather than depth, and has yet to establish a correlation between the small punch creep test data and traditional uniaxial tensile test data, small punch creep data creep damage characteristics associated research is scarce. In this paper, based on the theory of continuum damage mechanics, combined with the macro test, the theoretical analysis, the application of finite element numerical simulation of a small punch specimens in high temperature creep damage analysis and research. The main research work and conclusions are as follows: (1) SUS304 material of high temperature uniaxial tensile creep test and small punch creep test, SUS304 material creep damage constitutive equation. Creep damage' dissertation">Creep damage constitutive equation obtained by the two experimental techniques: performance evaluation of creep damage based on the technology of small punch creep test feasibility. (2) Based on the large commercial finite element software ABAQUS, through the preparation of the user subroutine UMAT in ABAQUS coupled with improved KR creep damage constitutive equation, and thus complete analog the specimen creep damage and destruction of the whole process, to solve the The conventional creep numerical analysis can not get the third stage of the creep problem; prove the correctness of the finite element model of the establishment of. (3) The specimen damage curve variation of creep strain variation similar to the damage curve deceleration, constant speed and acceleration of the three stages. Localized creep damage is very obvious characteristics, sample failure first occurred at 0.8mm in from the center of the surface of the specimen under relatively consistent the necking part to its experimental observation. (4) small punch specimen creep deformation process is more complex, unlike the uniaxial creep deformation and member of the compression process. Creep strain of the specimen in the radial direction on the dispersibility, and the trend of the deformation occurs in the center of the sample away from the center unit of the same, and some even opposite. (5) the deflection of the coefficient of friction of the contact surface between the indenter and the sample on the center of the specimen, the creep strain, creep damage have a greater impact, select zero friction coefficient obtained in the most conservative results prove the model zero friction coefficient rationality. (6) the thickness of the sample, the sample diameter, pressure header diameter of the small punch creep test results using the finite element simulation technology. The results showed that of the thickness of the sample for the test results the largest test specimen thickness is preferably controlled at between 0.45mm ~ 0.5mm.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > General issues of engineering materials > Engineering and materials testing
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