Brittle fracture in ductile solids produced by Sandwich Layers
01 Dec 1976-International Journal of Fracture (Kluwer Academic Publishers)-Vol. 12, Iss: 6, pp 923-924
About: This article is published in International Journal of Fracture.The article was published on 1976-12-01. It has received 14 citations till now. The article focuses on the topics: Fracture mechanics & Fracture toughness.
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TL;DR: In this paper, the significance of crack stability in fracture toughness testing is discussed and the roles played by testing machine stiffness, testpiece geometry and material rate dependence are described, and a compilation of the stability factors for more than twenty testpiece geometries under different loading conditions is given and compared with experimental results.
Abstract: The significance of crack stability in fracture toughness testing is discussed and the roles played by testing machine stiffness, testpiece geometry and material rate dependence are described. A compilation of the stability factors for more than twenty testpiece geometries under different loading conditions is given and compared with experimental results. Supplementary experimental methods of promoting crack stability for inherently unstable materials are discussed and illustrated with examples.
39 citations
TL;DR: In this article, the effect of thickness on the fracture behavior of a high-impact polystyrene containing approximately 7% rubber is studied, and a modified bimodal fracture analysis based on linear elastic fracture mechanics concepts is presented to analyse the experimental results.
Abstract: The effect of thickness on the fracture behaviour of a high-impact polystyrene containing approximately 7% rubber is studied. For thicknesses below 10 mm plane stress ductile tearing occurs and deep edge notched tension specimens are used to obtain the specific essential work of fracture (we) in plane strain. Mixed mode plane strain-plane stress fracture is predominant in single-edge notched tension specimens with thicknesses above 10 mm. By assuming that the plane stress layers are given by the overall fracture toughness (Kc) a modified bimodal fracture analysis based on linear elastic fracture mechanics concepts is presented to analyse the experimental results. The plane strain fracture toughnessGc1 (=Kc12/E) is in good agreement withwe. It is shown thatKc1 for HIPS is larger than that of the polystyrene matrix alone due to the toughening effect of the rubber at the crack tip vicinity.
38 citations
19 citations
TL;DR: In this article, a study of the accumulation of damage in GRP laminates during tensile loading was made and the effects of laminate construction, loading geometry and exposure to water were examined.
Abstract: A study has been made of the accumulation of damage in GRP laminates during tensile loading. Changes in dynamic elastic properties resulting from microstructural damage events are related to the acoustic emission patterns recorded during deformation. The effects of laminate construction, loading geometry and exposure to water have also been examined. It is found that the shapes of AE/stress curves show well-defined characteristics that can be related to laminate structure. There is a good correlation for one particular laminate between changes in resonant frequency resulting from tensile loading and the integrated acoustic emission count. On the other hand, as far as ring-down counting is concerned, there is clearly no unique relationship between the integrated count at fracture and such mechanical properties as modulus or failure stress. Neither has it been possible to use damping (peak-width measurements) as a reasonable indicator of accumulated damage.
17 citations
TL;DR: In this article, the authors showed that the tear resistance of multi-layered polyethylene polypropylene films can be predicted from the individual layers by an additive rule and that the most notable exception from this additive rule is the case of multilayered polypolyethylene films containing a polymethylene layer.
Abstract: The tear resistance of multi-layered plastic films can be generally predicted from the tear resistance of individual layers by an additive rule. The most notable exception from this additive rule is the case of multi-layered films containing a polyethylene layer. The reason for this specific case is explained by the constraint on the plastic yield zone of polyethylene, which causes a dramatic drop in the tear resistance of the multi-layered film. An extensive plastic zone is generated during the tear fracture of a single layer polyethylene film. This yield zone does not appear when polyethylene is laminated with other polymer films.
14 citations
References
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TL;DR: In this paper, Gurney and Hunt showed that the fracture toughness of a beam-like structure can be found within the limits of the quasistatic concept, which corresponds to a time rate of increase of crack length of about one thousandth of the velocity of a longitudinal wave in the material.
66 citations
TL;DR: In this article, a modified DCB test with loadings applied at the thick base instead of near the apex is suggested, and experiments agree with theory that this provides better cracking stability and easier control of the crack path.
Abstract: The conventional tapered DCB specimen loaded at the apex is shown to exhibit less stability than parallel DCB testpieces cracking under stiff testing conditions. A modified test with loadings applied at the thick base instead of near the apex is suggested. Experiments agree with theory that this provides better cracking stability and easier control of the crack path, along with a wider range of crack velocities in one test.
23 citations
13 citations