scholarly journals Elevated temperature elastic-plastic-creep test of stiffened shear-lag panel. Final report

1974 ◽  
Author(s):  
R. L. Egger
Keyword(s):  
Elevated Temperature ◽  
Creep Test ◽  
Final Report ◽  
Shear Lag ◽  
Elastic Plastic ◽  
Plastic Creep

An Elastic-Plastic-Creep Finite Element Analysis for Small Punch Creep Test Specimens

2006 ◽  
Author(s):  
Xiang Ling ◽  
Yangyan Zheng ◽  
Zhengmai Qian
Keyword(s):  
Finite Element ◽  
Creep Test ◽  
Equivalent Stress ◽  
Creep Damage ◽  
Flow Rule ◽  
Element Analysis ◽  
Small Punch ◽  
Elastic Plastic ◽  
Plastic Creep ◽  
Small Punch Creep Test

An elastic-plastic-creep finite element model, incorporating a Von Mises plastic flow rule and a creep damage equation, was established based on the small punch creep test on Cr5Mo steel specimens at 550 °C and three different loads. Finite element analyses were performed to examine the variation of the central creep deflection and the creep strain with time and the evolution of creep damage. The sensitivity of the creep deflection and equivalent stress at the centre on the disc to mesh size is discussed. Numerical results presented in this paper confirm that the creep damage at the central part is high. The stress gradients are highest near the centre area of the specimen (from 0 to 1 mm). Therefore, accurate stress and strain can be obtained using refined meshes near the specimen center and coarse meshes in other places. The test results are in agreement with those of the numerical simulation and three different stages appearing in the curve of creep deflection, which are quite similar to those observed in conventional creep tests.

Inelastic Behavior of Finite Circular Cylindrical Shells

1977 ◽  
Vol 99 (1) ◽  
pp. 31-38 ◽  
Author(s):  
J. M. Chern ◽  
D. H. Pai
Keyword(s):  
Elevated Temperature ◽  
Thermal Stresses ◽  
Structural Model ◽  
Cylindrical Shells ◽  
Test Facility ◽  
Inelastic Behavior ◽  
Elastic Plastic ◽  
Inelastic Analysis ◽  
Circular Cylindrical Shells ◽  
Plastic Creep

In the design of elevated temperature components such as those encountered in Liquid Metal Fast Breeder Reactor (LMFBR) service, the designer/analyst is often faced with the task of having to assess structural adequacy of pressure vessel and piping components which experience high cyclic thermal stresses. Expensive and time consuming detailed inelastic analyses using finite element techniques are often necessary for such an assessment. Experience with the design of the LMFBR components has focused on an urgent need for simplified inelastic analysis methods which can aid the designer/analyst in scoping the design and minimize the number of parts requiring detailed inelastic analysis. Through its participation in the FFTF (Fast Flux Test Facility) and CRBRP (Clinch River Breeder Reactor Plant), Foster Wheeler Energy Corporation has developed a series of simplified analysis computer programs. The underlying philosophy in this work has been to make simplifying assumptions on the structural model but to solve the resulting boundary value problem as exactly as practicable so that approximations in the stress state or constitutive equations are not introduced. This paper is the third in a series [1, 11] by the authors dealing with the elastic-plastic-creep behavior of cylindrical structures. A rate formulation is presented for the elastic-plastic-creep analysis of finite circular cylindrical shells with various end conditions subjected to varying axisymmetric pressure loads, through-the-wall and along-the-length temperature gradients, and either axial loads or axial deformations. The solution procedure is based on direct integration and successive approximation and shown to be efficient in dealing with complicated loading histories. Applications of the present method of analysis are illustrated by numerical examples of elevated temperature design problem.

Elastic-plastic-creep response of multilayered systems under cyclic thermo-mechanical loadings

2018 ◽  
Vol 32 (3) ◽  
pp. 1227-1234 ◽  
Author(s):  
Xiaotao Zheng ◽  
Jiqiang Wang ◽  
Wei Wang ◽  
Linwei Ma ◽  
Wei Lin ◽  
...  
Keyword(s):  
Creep Response ◽  
Elastic Plastic ◽  
Multilayered Systems ◽  
Plastic Creep

Virtual Methods in Creep Crack Growth Predictions in 316H Stainless Steels

2007 ◽  
Author(s):  
Masataka Yatomi ◽  
Kamran M. Nikbin
Keyword(s):  
Crack Growth ◽  
Plane Strain ◽  
Stainless Steels ◽  
Creep Crack Growth ◽  
Crack Propagation Rate ◽  
Creep Model ◽  
Elastic Plastic ◽  
Creep Crack ◽  
Plastic Creep ◽  
Plane Strain Crack

The paper discusses numerically based virtual techniques of creep crack growth predictions in a fracture mechanics component. The material properties used are for 316H stainless steels and the constitutive behaviour of the steel is described by a power law creep model. A damage-based approach is used to predict the crack propagation rate in compact tension (C(T)) specimens and the data are correlated against an independently determined C* parameter. Elastic-plastic-creep analyses are performed using two different crack growth criteria to predict crack extension under plane stress and plane strain conditions. The NSW and NSW-MOD strain exhaustion models are applied to compare to the experimental data and FE predictions. The plane strain crack growth rate predicted from the numerical analysis is found to be less conservative than the plane strain NSW model but more conservative than plane strain NSW-MOD model, for values of C* within the limits of the present creep crack growth testing standards. At higher loads and C* values, the plane strain crack growth rates, predicted using an elastic-plastic-creep material response, approach is considered and compared to the plane strain NSW-MOD model.

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