A tensile setup for the IDNS composite shear test

Pettersson, Kaj; Neumeister, Jonas M.

doi:10.1016/j.compositesa.2005.08.018

Cited by 13 publications

(8 citation statements)

References 19 publications

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“…Recently, the new ASTM D3846 and DNS tests 120 further improved the ILSS. 116–118 , 121–124 Almeida et al. 49 investigated the influence of lay-up configurations on the ILSS using two different test methods such as the ASTM D3846 DNS and ASTM D2344 SBS.…”

Section: Comparison Of Composite Materials Testing Methodsmentioning

confidence: 99%

Review of material test standardization status for the material qualification of laminated thermosetting composite structures

Park

Choi

2020

Journal of Reinforced Plastics and Composites

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This paper presents a review of recent literature related to the static mechanical testing of thermoset-based carbon fiber reinforced composites and introduces a material qualification methodology to generate statistically-based allowable design values for aerospace application. Although most test methods have been found to be effective in determining the specific material properties by incorporating them into the material qualification and quality control provisions, a full validation to clarify the behavior of thermoset-based laminated composite materials is currently lacking, particularly with regard to the characterization of compressive, in-plane, interlaminar shear, and damage tolerance properties. The present study obtains information on the different types of test method that can be employed within the same material properties, and makes an in-depth experimental comparison based on the past literatures. A discussion on the scope of theoretical analysis involves a description of how the proposed test method can be adequate for obtaining more accurate material properties. This discussion is directly applicable to the assessment of material nonlinearity and the geometrical effect of specimens. Finally, the resulting failure modes and the effect of each material property are studied to aid the understanding of the load distribution and behavior of laminated composite materials.

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Section: Comparison Of Composite Materials Testing Methodsmentioning

confidence: 99%

Review of material test standardization status for the material qualification of laminated thermosetting composite structures

Park

Choi

2020

Journal of Reinforced Plastics and Composites

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“…In this study, an inclined double notch shear test was employed to sustain a pure shear mode in the gage region (Fig. 1c) by removing the bending stress components at the notches [15, 16]. For different notch distances with a given specimen thickness ( b = 4 mm in this study), a different tilting angle is needed.…”

Section: Methodsmentioning

confidence: 99%

Progressive post-yield behavior of human cortical bone in shear

Dong

Luo

Wang

2013

Bone

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Bone fragility depends on its post-yield behavior since most of energy dissipation in bone occurs during the post-yield deformation. Previous studies have investigated the progressive changes in the post-yield behavior of human cortical bone in tension and compression using a novel progressive loading scheme. However, little is known regarding the progressive changes in the post-yield behavior of bone in shear. The objective of this short study was to address this issue by testing bone specimens in an inclined double notch shear configuration using the progressive loading protocol. The results of this study indicated that the shear modulus of bone decreased with respect to the applied strain, and the rate of degradation was about 50% less than those previously observed in compression and tension tests. In addition, a quasi-linear relationship between the plastic and applied strains was observed in shear mode, which is similar to those previously reported in tension and compression tests. However, the viscous responses of bone (i.e. relaxation time constants and stress magnitude) demonstrated slight differences in shear compared with those observed in tension and compression tests. Nonetheless, the results of this study suggest that the intrinsic mechanism of plastic deformation of human cortical bone may be independent of loading modes.

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“…The DNS test is a representation of the interlaminar shear strength and can be adapted to test circular profiles. However, the test has been found to be very sensitive to machine and notch geometry (Shokrieh and Lessard (1998)) and high local stress concentrations are generated at the notches (Pettersson and Neumeister (2006)). Recent studies have also shown that DNS performed in tension or in compression can lead to different results (Empa unpublished results) and this is assumed to be due to the different stress concentrations around the notch when loaded in tension or in compression.…”

Section: Double Notch Shearmentioning

confidence: 99%

Mechanical and Durability Screening Test Methods for Cylindrical CFRP Prestressing Tendons

et al. 2017

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Concrete prestressed with carbon fibre reinforced polymer (CFRP) tendons beneficially utilises the strain capacity and durability characteristics of the CFRP material. However, changes to CFRP tendon material formulations or production processes present a challenge when building up a body of knowledge to inform the long-term behaviour of a prestressed concrete system. Initial qualification tests can help identify the potential for FRP tendons to meet long-term mechanical and durability requirements. Protocols that can be undertaken on commercially produced cylindrical FRP pultrusions are particularly advantageous since the constituent materials and manufacturing processes are representative of the actual product.

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A tensile setup for the IDNS composite shear test

Cited by 13 publications

References 19 publications

Review of material test standardization status for the material qualification of laminated thermosetting composite structures

Review of material test standardization status for the material qualification of laminated thermosetting composite structures

Progressive post-yield behavior of human cortical bone in shear

Mechanical and Durability Screening Test Methods for Cylindrical CFRP Prestressing Tendons

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