Approximate analysis of transient creep deformation

1968 ◽  
Vol 3 (4) ◽  
pp. 288-296 ◽  
Author(s):  
D L Marriott
Keyword(s):  
Steady State ◽  
Creep Deformation ◽  
Creep Behaviour ◽  
Transient Creep ◽  
Steady State Creep ◽  
Approximate Analysis ◽  
Numerical Examples ◽  
Important Group

A method has been proposed which approximates transient creep behaviour by the superposition of elastic and steady-state creep deformation. The present paper discusses the errors incurred by this method. It is shown that they are small. Equations are derived which enable corrections to be calculated with moderate accuracy for an important group of creep theories. Some numerical examples are included for comparison.

Evaluation of the Stress Distribution by the Stepped Load Indentation Test with Constant Depth

2016 ◽  
Vol 725 ◽  
pp. 293-298
Author(s):  
Atsuko Takita ◽  
Katsuhiko Sasaki ◽  
Ken-Ichi Ohguchi ◽  
H. Fujiki
Keyword(s):  
Steady State ◽  
Solder Joint ◽  
Creep Test ◽  
Creep Deformation ◽  
Indentation Test ◽  
Transient Creep ◽  
Steady State Creep ◽  
Indentation Creep ◽  
Stress Variation ◽  
Indentation Process

For accurate evaluation of the reliability of electronic package, FEM analyses considering the creep deformation of solder joint in-situ should be conducted. It is well known that the indentation creep test has an advantage to evaluate the creep deformation in microscopic region although there are the problems. Authors already modified the indentation creep test and proposed the method to estimate the steady state creep deformation by the modified test. For lead free solders generally used for the solder joint, the transient creep deformation should be measured by the indentation test in addition to the steady state creep deformation. The transient creep strain occurs in the indentation process. Therefore, it needs to separate the strain into the elastic-plastic strain and the creep strain. In this paper, the method to obtain the stress-strain relation using the indentation test is proposed. New indentation test used the stepped load was proposed to obtained the stress variation during the indenter was pushed and conducted by the numerical test. The suitable measurement point to obtain the relationship between the stress and the strain was identified. The stress variation estimated by proposed area well coincides with the equivalent stress variation of the nodal solution. Therefore, if the method to obtain the strain variation during the indentation process by the indentation in future is developped, it may be possible to estimate the stress-strain curve expressed the uniaxial deformation in the microscopic region.

Analysis of Steady State Creep Behaviour in Spherical Vessels Made of Composite Material

2019 ◽  
Vol 18 ◽  
pp. 3401-3408 ◽  
Author(s):  
Sukhjinder Singh Sandhu ◽  
Tejeet Singh ◽  
V.K. Gupta
Keyword(s):  
Composite Material ◽  
Steady State ◽  
Creep Behaviour ◽  
Steady State Creep

scholarly journals ɤ-TiAl Alloy: Tensile Creep Deformation Behaviour and Creep Life at 832 °C

2021 ◽  
Author(s):  
Mainak Saha
Keyword(s):  
Steady State ◽  
Creep Deformation ◽  
Original Work ◽  
Single Phase ◽  
Tial Alloy ◽  
Deformation Behaviour ◽  
Steady State Creep ◽  
Tensile Creep ◽  
Creep Life ◽  
Processing Techniques

Creep deformation in single phase ɤ-TiAl alloy manufactured using different processing techniques has been an extensively studied topic since the late 1970s. The present work revisits the original work on understanding the tensile creep deformation behaviour of wrought single-phase ɤ-TiAl alloy by Hayes and Martin [1] and is aimed to develop an understanding of steady state creep. Besides, it is also aimed to investigate the creep life for stress levels of 69.4 and 103.4 MPa at 832 ⁰C using Monkman-Grant [2] approach.

Design of Pressurized Cylinders for High-Temperature Applications

1960 ◽  
Vol 82 (2) ◽  
pp. 477-481
Author(s):  
J. F. Traexler
Keyword(s):  
Steady State ◽  
High Temperature ◽  
Creep Rate ◽  
Plane Strain ◽  
Material Properties ◽  
Rate Function ◽  
Specific Form ◽  
Steady State Creep ◽  
Numerical Examples ◽  
Walled Cylinder

General equations for the stresses in a thick-walled cylinder in a state of plane strain are derived considering “steady-state” creep. A specific form of the creep-rate function is assumed and numerical examples are included to show the effect of geometry and material properties.

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