Effect of high strain rate on tensile response and failure analysis of titanium/glass fiber reinforced polymer composites:
21 May 2021-Journal of Composite Materials (SAGE PublicationsSage UK: London, England)-Vol. 55, Iss: 24, pp 3443-3470
TL;DR: In this article, the high strain rate tensile response of titanium-based fiber metal laminates (FMLs), consisting of layers of titanium Ti-6Al-4V alloy sheet and glass fiber reinforced composites, is examined.
Abstract: The high strain rate tensile response of titanium-based fiber metal laminates (FMLs), consisting of layers of titanium Ti-6Al-4V alloy sheet and glass fiber reinforced composites, is examined. A ha...
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TL;DR: In this paper , quasi-static and dynamic compression tests as well as ballistic tests were conducted on a two-phase α+β alloy Ti-6Al-4V (in m%) manufactured by hot-rolling.
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TL;DR: In this article , the authors proposed a modified relaxation model based on the earlier formulated plasticity relaxation model for homogeneous materials, which makes it possible to describe the deformation of the layered composites from elastic to irreversible deformation, finalised by the failure moment.
Abstract: The temporal nature of static and dynamic deformation of fibre metal laminates is discussed here. The aim of the study is to verify the proposed innovate model using layered composites. The modified relaxation model is based on the earlier formulated plasticity relaxation model for homogeneous materials. The proposed relaxation model makes it possible to describe the deformation of the layered composites from elastic to irreversible deformation, finalised by the failure moment. The developed approach allows us to consider the effects of the transition from static to dynamic loading. This means that the model-calculated dynamic limiting characteristics of the metal and the strength of brittle materials will have a determining character, depending on the loading history. The verification of the model using a glass fibre reinforced aluminium composite, glass fibre reinforced titanium composite, carbon fibre reinforced aluminium composite, and Kevlar fibre reinforced aluminium composite with different thickness ratios between metal and polymer layers is given. It is shown that the theoretical deformation curves of the metal composites at the various strain rates, finalised by brittle fracture of the polymer layers or continued irreversible deformation of remaining unbroken metal layers with destroyed polymer (fibre/epoxy) layers, are predicted. Based on the same structural−temporal parameters for five (Ti/GFRP (0/90)/Ti/GFRP(90/0)/Ti) and three (Ti/GFRP(0/90/90/0)/Ti) layers glass fibre reinforced titanium composites and the polymer layers, one-stage and two-stage stress drops during the irreversible deformation of the composite under static and dynamic loading are simulated. The change of the multi-stage fracture of the composite from static to dynamic loading and the fracture characteristic times of the polymer (100 s and 15,400 s) and the metal (8.4 ms) are correlated. Continued plastic deformation of the composite after fracture of the polymer layers is related with different values of the characteristic relaxation times of the polymer (fibre/epoxy) and the metal layers.
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"Effect of high strain rate on tensi..." refers methods in this paper
...Equation (22) and von Mises J2 function are compared to condense this plasticity model to the isotropic one providing a11 1⁄4 1.(48) In this study, a power law is used to present the relationship between r e as...
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TL;DR: In this article, a review of the tensile impact testing of composite materials is given and a new method, using a modified version of the standard tensile split Hopkinson's pressure bar (SHPB), is described.
Abstract: A brief review is given of techniques which have been employed in attempts to determine the mechanical properties of composite materials under tensile impact loading. The difficulties encountered in the design of a satisfactory tensile impact testing machine for composite materials are discussed and a new method, using a modified version of the standard tensile split Hopkinson's pressure bar (SHPB), is described. Dynamic stress-strain curves for unidirectionally-reinforced carbon/epoxy composite, in which failure occurs in less than 30 μsec at a mean strain rate of about 400 sec−1, are presented and their validity is established. An extension of the technique to allow the testing of wovenroving reinforced glass/epoxy composites is described and dynamic stress-strain curves obtained for which the times to failure approach 100 μsec and the average strain rate is of the order of 1000 sec−. Comparative stress-strain curves at low and intermediate rates of strain are obtained and the effect of strain rate, over about 7 orders of magnitude, on the tensile modulus, and strength, fracture strain and energy absorbed in fracturing is determined. The limitations of the technique are discussed.
400 citations
TL;DR: In this article, a servo-hydraulic test jig and a fixture were designed and manufactured for testing composites under uni-axial loading at quasi-static and intermediate strain rates of 0.001−100−1.
197 citations