Geometry Determination of Cruciform-Type Specimen and Biaxial Tensile Test of C/C Composites

Ohtake, Yasuhiro; Rokugawa, Shuichi; Masumoto, Hiroshi

doi:10.4028/www.scientific.net/kem.164-165.151

Cited by 23 publications

(15 citation statements)

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“…The stresses acting on a component in service are generally multi-axial in nature. Therefore, it is necessary to consider the mechanical properties not only under uniaxial stress states but also under these multi-axial states of stress (Ohtake et al, 1999). In recent years, tests have been designed in an attempt to produce forces that are closely related to those that the material is subjected to during normal service conditions.…”

Section: Biaxial Testingmentioning

confidence: 99%

“…It has been recognized that limiting the evaluation of a material's mechanical characteristics to uniaxial coupon tests can lead to a misrepresentation of the behavior of a material in an engineering structure (Jones and Green, 2001). However, by the use of more realistic loading during the test such as the introduction of biaxial loading conditions leads to a more accurate representation of the expected behavior of the structure in-service (Ohtake et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

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A review of planar biaxial tensile test systems for sheet metal

Hannon

Tiernan

2008

Journal of Materials Processing Technology

211

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Section: Biaxial Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A review of planar biaxial tensile test systems for sheet metal

Hannon

Tiernan

2008

Journal of Materials Processing Technology

211

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“…Several authors have proposed specimen designs for specific applications and materials, varying the cut shape, the type of the thickness-reduced area and the type of slits in the specimen arms, which serve to reduce undesired lateral constraints on the strain in the center region of the specimen [1]. Deng et al [2], Kuwabara et al [3] and Makinde et al [4] optimized specimens for metals.…”

Section: State-of-the-artmentioning

confidence: 99%

Cruciform Specimen Design for Biaxial Tensile Testing of SMC

Schemmann¹,

Lang²,

Helfrich

et al. 2018

J. Compos. Sci.

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This paper presents an investigation of different cruciform specimen designs for the characterization of sheet molding compound (SMC) under biaxial loading. The considered material is a discontinuous glass fiber reinforced thermoset. We define various (material-specific) requirements for an optimal specimen design. One key challenge represents the achievement of a high strain level in the center region of the cruciform specimen in order to observe damage, at the same time prevention of premature failure in the clamped specimen arms. Starting from the ISO norm for sheet metals, we introduce design variations, including two concepts to reinforce the specimens' arms. An experimental evaluation includes two different loading scenarios, uniaxial tension and equi-biaxial tension. The best fit in terms of the defined optimality criteria, is a specimen manufactured in a layup with unidirectional reinforcing outer layers where a gentle milling process exposed the pure SMC in the center region of the specimen. This specimen performed superior for all considered loading conditions, for instance, in the uniaxial loading scenario, the average strain in the center region reached 87% of the failure strain in a uniaxial tensile bone specimen.

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“…proposed, leading to a difficult comparison of the results; they can be classified into three main categories [34], i.e. cut type, reduced section type and slot type specimen.…”

Section: Introductionmentioning

confidence: 99%