To study the contribution of different geometric parameters on the failure load for multi holes pin joints prepared from glass/epoxy nanoclay laminates

Abstract

The present work aims to analyze the strength and failure modes for the multi holes pin joint configurations made from unidirectional glass/epoxy nanoclay laminates. The geometric parameters, i.e. the distance from the free edge of the specimen to the diameter of the first two holes (E/D) ratio, the distance between two holes along the length of the specimen to the diameter of the hole (F/D) ratio, the distance between the two holes along the width of the specimen to the diameter of the hole (P/D) ratio and side width to diameter (S/D) ratio were studied for their effect on strength and failure modes of the joint. Design of experiment with Taguchi method was used for the optimization of different geometric parameters. Analysis of variance was applied to determine the influence of individual geometric parameter on the strength of the joint. The results demonstrate that the E/D and F/D ratios are the most significant parameters to increase the strength of multi holes pin joint configurations. Their percentage contributions were about 62% to 65% and 23% to 26%, respectively. Thereafter, the characteristic curve method along with Tsai–Wu failure criteria was applied to compare the numerical and experimental predictions.

Reliability analysis to improve performance of multi-pin glass fiber-epoxy laminated composite joints using Weibull distribution

“…The 16-trial run has been performed with pre-defined sets of geometrical parameters using higherthe-better attributes in this analysis with experimental results, and to obtain the mean bearing strength value, each specimen of the selected configuration was evaluated three times, as shown in Table 2. The contribution of individual factors implies the influence parameters, and in the present study, E:D and F:D ratios had contributed the most in terms of strength of multi-pin laminated joints compared to the S:D and P:D ratios (Singh et al, 2018).…”

“…If “ θ ” lies within this range of angle 30° ≤ θ ≤ 60°, it implies shear failure mode, and if “ θ ” ranging from 60° ≤ θ ≤ 90°, it indicates net-tension failure mode. The characteristic curve was plotted at the periphery of the hole, and the failure load of the joints can be predicted numerically by calculating the failure index (FI) using Tsai–Wu failure criteria (Singh et al , 2018, 2019) as shown in equation (3): …”

Evolution of the bearing failure map of pinned flax composite laminates aged in marine environment

“…often represent the most suitable choice also taking into account their capability to sustain higher loads as well as their easy of assembly. In order to optimize the use of mechanical connections in composite or hybrid structures, the exploitation of the bearing behavior of pinned composite laminates has been investigated in previous papers concerning polymeric composites reinforced mainly with synthetic fibers such as glass [5][6][7][8][9][10][11] and carbon [12][13][14][15]. Furthermore, the influence of the geometrical configuration of pin-loaded composites on their bearing performances and failure modes 4 was recently investigated also for flax and glass-flax reinforced hybrid structures in our recent papers [16,17].…”

Comparative study of failure analysis in glass fiber reinforced laminated pin joints under cyclic and static loading conditions

“…Static loading’s bearing strength was determined using the Tsai-Wu failure theory on the characteristic curve. 20,37 The process of determining the characteristic length and failure index was elaborated upon by Singh et al 38 Equations (2) 39 illustrated the determination of the failure index through the application of the Tsai-Wu failure criterion.Where F1,F2,F11,F22,and F66 are Tsai-wu polynomials and σ11,σ22,τ12 are stress in x, y, and in-plane shear stress, respectively.…”