Experimental investigation to evaluate total energy release rate for unidirectional glass/epoxy composite under Mixed mo
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Sådhanå (2020)45:251 https://doi.org/10.1007/s12046-020-01482-3
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Experimental investigation to evaluate total energy release rate for unidirectional glass/epoxy composite under Mixed mode-I/II load ABILASH DESAI1,*, C M SHARANAPRABHU2 and S K KUDARI3 1
Department of Mechanical Engineering, SDMCET, Dharwad, India Department of Mechanical Engineering, PESITM, Shivamogga, India 3 Department of Mechanical Engineering, CVR College of Engineering, Hyderabad, India e-mail: [email protected]; [email protected]; [email protected] 2
MS received 9 September 2019; revised 10 June 2020; accepted 13 July 2020 Abstract. In this paper, the total energy release rates for unidirectional glass/epoxy composites were evaluated using Compact Tension Shear (CTS) and Four-Point Bend (FPB) Mixed mode (I/II) fracture specimens. Unidirectional glass fibre laminates were considered for the experimental work. Specimen plates of required thickness were fabricated using hand lay-up technique. The experimental study was conducted for seven loading angles varying from 0 to 90 with an increment of 15 for CTS specimen and 6 crack positions varying from 0 to 1 with an increment of 0.2 for FPB specimen. Load vs. displacement data are plotted to evaluate the peak loads for both the CTS and FPB Mixed mode (I/II) fracture specimens of various loading angles and crack positions, which are utilized to estimate the total energy release rate. It is found that the total energy release rate depends on the loading angle and crack positions for CTS and FPB Mixed mode (I/II) fracture specimens. For a particular load, the total energy release rate is highly dominating in FPB compared with the CTS fracture specimen. Hence, the FPB Mixed mode (I/II) fracture specimen can be preferred over CTS Mixed mode (I/II) fracture specimen to evaluate the total energy release rate. Keywords. Total energy release rate; compact tension shear specimen (CTS); four-point bend specimen (FPB); unidirectional glass/epoxy laminate.
1. Introduction The total energy release rate of glass/epoxy laminates is an essential parameter in longitudinal tensile failure, which helps in controlling damage initiation and propagation in longitudinal loading [1]. In glass/epoxy composites, fibre pull-outs are common kinds of translaminar fracture failure, which can be usually investigated by visual inspection [1, 2]. Most of the authors agree that the total energy release rate in glass/epoxy composites is directly related to the energy dissipated by debonding and by friction during the development of these surfaces [3–6]. On the basis of physical and mechanical properties, including strength, mass, toughness and stiffness, materials are selected according to their engineering applications. The ability to yield benefit of the lightweight potential of glass/epoxy composites is dependent, in several applications, on the capability to estimate their fracture behaviour. Unidirectional (UD) fibres have now become a new clas
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