Abstract
A small punch test is one of the innovative methods that can be used to evaluate the properties of a material without destructive harm to the in-service component. Conventionally identifying material properties by a uniaxial test is widely applied to engineering. How the properties obtained from a small punch test can be applied with the same utility has been a goal. In 2006, European Code of Practice (CoP) of small punch tests was first released, in which the correlation factor, ksp, was introduced to bridge the gap between the above methods. The author investigates the relationship between a uniaxial creep text and a small punch creep test by exploring the correlation factor ksp. Various sets of experiments and a comparative study of the conventional uniaxial creep test and small punch creep test were carried out. Methods including Norton, Larson-Miller and Time versus Stress relation were employed to identify the value of ksp. Different ksp values were found in different materials, which indicate that ksp values of materials need to be identified separately. In addition, the life prediction of a small punch creep test was carried out and the results of the life prediction predict a reasonable accuracy, which indicates that the small punch creep test is a reliable method for life prediction.
Highlights
The development of the modern industrial history is characterized by the continually increasing operating temperature of the industrial equipment and machineries
Uniaxial tests of the three above materials (P91, 1.25Cr0.5MoSi, 16Mo3) were carried out at constant temperatures (566 ◦ C (839 K), 575 ◦ C (848 K), 550 ◦ C (823 K)), which are corresponded to the small punch test to make the comparison
It could be derived from the figure that the minimum creep strain rate and stress of both small punch tests and uniaxial tests obey the Norton creep law
Summary
The development of the modern industrial history is characterized by the continually increasing operating temperature of the industrial equipment and machineries. Among all the small sample test techniques, the small punch test is considered as the most. To conduct a small punch test, only a small size of material is needed to. Small punch test could be could be applied to obtain theand creep properties at an applied to obtain creep properties uniaxial of materials at an it the is the conventional creep testelevated results, temperature. The test specimen is only subjected to single stress state, which is creep. In While the uniaxial test specimen only subjected to bends single while stress the state, which is tensiletest. While in the in small creepthe test, the test specimen bends while the punch moves stress. Thispunch situation, punch imposes a three state stress to the ball test moves downwards.
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