The small punch toughness test: some detailed fractographic information

Bulloch, J.H.

doi:10.1016/0308-0161(94)00050-s

Cited by 26 publications

(12 citation statements)

References 5 publications

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“…In his paper, the disc specimen was assumed to be deformed under membrane stresses since the thickness of the disc was small in comparison to the radius of the punch head. Chakrabarty pointed out that the maximum equivalent strain inside the specimen can be approximated as 2 2(1 cos ) 2ln…”

Section: Theoretical Analysismentioning

confidence: 99%

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Finite element study for determination of material’s creep parameters from small punch test

2010

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Compared with the conventional tensile creep test, it is much more difficult to obtain the creep properties of a material by the small punch creep test due to the complex deformation response and stress distribution in the miniature specimen of the material. Although creep behavior has been investigated by the small punch test, most studies have been limited to a specimen geometry and therefore, cannot be extended to other conditions conveniently. In this study, a new developed analysis routine is presented to derive the creep parameters of a material using data obtained from the small punch creep test. With the aid of the finite element method, the displacement and the displacement rate of the small punch are obtained for different load levels. The relationship between the stress and creep strain of the specimen and the applied load and the punch displacement is obtained by a dimensional analysis and the membrane stretching model. The creep properties obtained from small punch tests and the conventional creep tests are also compared. The values of the creep properties between the two types of tests agree well with each other within an acceptable accuracy range. This indicates that it is possible to obtain the creep parameters of a material from the small punch creep test instead of the conventional creep test by the analysis routines proposed in this study. Some suggestions for data reduction of the small punch creep tests are also presented to obtain more accurate material creep parameters.

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Section: Theoretical Analysismentioning

confidence: 99%

“…The small punch test has been widely used to characterize material properties, such as strength, flexibility and fracture toughness, at room temperature [2]. Recently, several significant improvements have been made on small punch creep test to determine creep behavior [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Finite element study for determination of material’s creep parameters from small punch test

2010

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“…Development of the method has been driven by the need to measure in-service degradation of mechanical properties with a limited volume of available material [2]. In the past decade, the small punch test has been used successfully to characterize the mechanical strength, impact toughness, and fracture properties of materials with specimens measuring only 0.5 mm in thickness by Bulloch [3][4][5], Dobes [6][7][8], Baek et al [9], Fleury [10,11], Ule [12], and Komazai et al [13], Yang and Wang [14] presented a numerical model in which the primary and the secondary creep stages were calculated but creep damage was not considered.…”

Section: Introductionmentioning

confidence: 99%

Creep damage in small punch creep specimens of Type 304 stainless steel

Ling

Zheng

You

et al. 2007

International Journal of Pressure Vessels and Piping

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“…irradiated material). This type of test became attractive and provided interesting information on the plastic deformation behaviour, on the fracture, as well as on ductile to brittle transition or evolution of the mechanical properties due to the temperature, to an environment or to ageing [15][16][17][18][19]. In the SPT, specimens in the form of disc or square were punched in their middle by a ball, which leads at the beginning of loading to a biaxial stress state of the specimen.…”

Section: Methodsmentioning

confidence: 99%