Effect of Metallic Inserts on the Strength of Pin Joints Prepared from Glass Fiber Reinforced Composites

2017 ◽  
Vol 67 (5) ◽  
pp. 592 ◽  
Author(s):  
Kulwinder Singh ◽  
J. S. Saini ◽  
H. Bhunia
Keyword(s):  
Glass Fiber ◽  
Failure Modes ◽  
Failure Criteria ◽  
Hole Diameter ◽  
Progressive Damage ◽  
Damage Analysis ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
Failure Loads ◽  
Experimental Findings

The present study deals with the failure analysis of pin joints by varying different geometric parameters i.e., edge distance to hole diameter (E/D) ratio and width to hole diameter (W/D) ratio. Pin joints were prepared from the glass fiber reinforced laminates incorporating the metal inserts. A range of 2 to 5 and 3 to 6 was considered for E/D and W/D ratios, respectively. The stress around the hole was redistributed by incorporating the metal inserts in the hole to increase the load carrying capacity. To predict the failure loads and failure modes numerically, progressive damage analysis along with Hashin failure criteria was used in the pin joints. Strength of the pin joints increased in the range of 65 per cent to 92 per cent with metal insert due to the redistribution of the stresses around the hole. Progressive damage analysis gave a good correlation with experimental findings. Thereafter, the strength of the joint was predicted by varying the thickness of the metal inserts.

Investigations to increase the failure load for joints in glass epoxy composites

2018 ◽  
Vol 233 (6) ◽  
pp. 2074-2090 ◽  
Author(s):  
Kulwinder Singh ◽  
JS Saini ◽  
H Bhunia ◽  
Jaspreet Singh
Keyword(s):  
Failure Modes ◽  
Failure Load ◽  
Failure Criteria ◽  
Hole Diameter ◽  
Glass Fiber Reinforced ◽  
Failure Loads ◽  
Ultimate Failure ◽  
Nanoclay Content ◽  
Woven Glass Fiber ◽  
Fiber Reinforced Laminates

The present work aims to increase failure loads of pin joints through nanofillers and metal inserts. Pin joints were prepared from woven glass fiber-reinforced laminates with nanoclay as filler material along with metal inserts fitted in holes. To investigate the effect of nanoclay content, 1–5 wt.% of nanoclay was mixed in epoxy. The increase in tensile strength up to 3 wt.% of nanoclay was observed which was due to increase in the specific surface area of the nanocomposite material. Dispersed nanoclay filler particles act as mechanical interlocking between fiber and epoxy matrix which creates a high friction coefficient. The optimal nanoclay content of 3 wt.% was finally used to prepare nanocomposite laminates. The geometric parameters, i.e. edge distance to hole diameter (E/D) ratio and width to hole diameter (W/D) ratio were varied from 2 to 5 and 3 to 6, respectively. Progressive damage analysis along with Hashin failure criteria was performed to predict failure loads and failure modes in pin joints, numerically. Metal inserts reduced the stress concentration around the hole and redistributed stresses at the pin/hole interface, which eventually increased the ultimate failure load of the joint.

Accelerated weathering of bolted joints prepared from woven glass fiber-reinforced nanocomposites

2019 ◽  
Vol 233 (10) ◽  
pp. 2108-2125
Author(s):  
Kulwinder Singh Chani ◽  
JS Saini ◽  
H Bhunia
Keyword(s):  
Tensile Strength ◽  
Glass Fiber ◽  
Accelerated Aging ◽  
Hole Diameter ◽  
Bolted Joints ◽  
Bolted Joint ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
Fiber Matrix ◽  
Nanoclay Content

This work deals with the accelerated aging of the bolted joints prepared from glass fiber-reinforced nanocomposite laminates. ASTM D5961 was used to design the bolted joint, and the geometric parameters, i.e. width-to hole-diameter ( W/ D) ratio and edge distance-to-hole diameter ( E/ D) ratio were fixed to 6 and 5, respectively. ASTM D1544 was used for accelerated aging, and a maximum of 500 h cyclical ultraviolet exposure, 8 h of ultraviolet radiation at 60 ℃ followed by 4 h of condensation at 50 ℃, was given to the specimens. A full factorial design of experiment was conducted on important control factors, i.e. aging time, bolt torque, and material variation, using response surface methodology. To investigate the effect of nanoclay content, a range of 0–5 wt% was investigated. Specimens with 3 wt% of nanoclay demonstrated optimum tensile strength and were selected to manufacture the bolted joint. Nanoplatelets having high aspect ratio increased the specific surface area and thus the tensile strength of the nanocomposite. It was found that the strength of the joints prepared with and without the nanoclay content decreased with the increase in the duration of aging. However, the joints with the nanoclay content had higher failure loads. The strength retention in the joints with nanoclay content was more in comparison to the joints made with neat epoxy. Nanoclay acted as a mechanical interlock at the fiber–matrix interface and improved the interfacial bond strength. A good dispersion of nanoclay also acts as a barrier to the moisture, which eventually reduces the degradation of the composite material due to the lesser fiber–matrix de-bonding under accelerated aging conditions.

scholarly journals THE EFFECT OF SUPPORT PLATE ON DRILLING-INDUCED DELAMINATION

2016 ◽  
Vol 3 ◽  
pp. 19-24 ◽  
Author(s):  
Navid Zarif Karimi ◽  
Hossein Heidary ◽  
Parnian Kianfar ◽  
Mahmud Hasani ◽  
Giangiacomo Minak
Keyword(s):  
Glass Fiber ◽  
Fiber Reinforced Composites ◽  
Analytical Models ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Support Plate ◽  
Glass Fiber Reinforced ◽  
Theory Of Plates ◽  
Effect Of Support ◽  
Experimental Findings

Delamination is considered as a major problem in drilling of composite materials, which degrades the mechanical properties of these materials. The thrust force exerted by the drill is considered as the major cause of delamination; and one practical approach to reduce delamination is to use a back-up plate under the specimen. In this paper, the effect of exit support plate on delamination in twist drilling of glass fiber reinforced composites is studied. Firstly, two analytical models based on linear fracture mechanics and elastic bending theory of plates are described to find critical thrust forces at the beginning of crack growth for drilling with and without back-up plate. Secondly, two series of experiments are carried out on glass fiber reinforced composites to determine quantitatively the effect of drilling parameters on the amount of delamination. Experimental findings verify a large reduction in the amount of delaminated area when a back-up plate is placed under the specimen.

Experimental Investigations of Masonry Columns Strengthened by SGFRP under Eccentric Loads

2013 ◽  
Vol 351-352 ◽  
pp. 1509-1513
Author(s):  
Zhi Zhang ◽  
Qian Gu ◽  
Qi Ming Yu
Keyword(s):  
Bearing Capacity ◽  
Glass Fiber ◽  
Seismic Behavior ◽  
Failure Modes ◽  
Fiber Reinforced Polymer ◽  
Experimental Investigations ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced Polymer ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced

5 masonry columns were strengthened by Sprayed Glass Fiber Reinforced Polymer (SGFRP) in this paper, and a research of the seismic behavior of them tested by eccentric loading experiment was presented. The failure modes of the strengthened masonry columns were illustrated and strengthening effects of them were discussed. The results showed that the bearing capacity of the reinforced columns increased greatly, and the ductility of them also improved significantly. Comparing the strengthening effects of the columns when the thickness of SGFRP and the number of glass fiber are different, some reasonable reinforce suggestions are proposed.

Impact performances and failure modes of glass fiber reinforced polymers in different curvatures and stacking sequences

2021 ◽  
pp. 002199832110590
Author(s):  
Cihan Kaboglu ◽  
Taha Y Eken ◽  
Yakup Yurekturk
Keyword(s):  
Glass Fiber ◽  
Failure Modes ◽  
Impact Resistance ◽  
Matrix Cracking ◽  
Fiber Reinforced ◽  
Stacking Order ◽  
Glass Fiber Reinforced ◽  
The Impact

Recently, glass fiber reinforced polymer composites have been increasingly used in applications which are exposed to impact loads due to their high strength, low weight, and corrosion resistance properties. Therefore, the effect of curvature of composite laminate on their impact resistance is important. In this study, the mechanical properties of three curvature diameters and two stacking sequences, which have not been compared before, were examined and compared. The diameter of curved composites is 760 mm, 380 mm, and 304 mm and flat designated as A, B, C, and D, respectively. The fiber stacking orders are [0/0/-45/+45/90/90]S and [90/90/-45/+45/0/0]S designated as Type 1 and Type 2, respectively. The drop-weight impact tests were performed and failure modes of composites were examined. It was observed that the impact resistance decreases with the increase of curvature, where 760 mm diameter and Type 2 composites had the highest strength in all of the composites. In addition, delamination, fiber breakage, and matrix cracking failure modes were observed in the composites after impact. The reason why the strength decreases as the curvature of the composite increases is that the curved areas create an effect that increases the external force applied. The reason why Type 2 stacking order is more durable than Type 1 stacking order is that the 90° fiber direction in the bottom layer has a damping effect on the applied force. According to the results of this study, composite materials with larger diameter and stacking order starting with 0° provides more mechanical strength. [Formula: see text]

Hygrothermal effects on mechanical joints prepared from fiber reinforced plastic nanocomposites

2019 ◽  
Vol 53 (26-27) ◽  
pp. 3875-3891
Author(s):  
Kulwinder Singh ◽  
JS Saini ◽  
H Bhunia ◽  
S Ray Chowdhury
Keyword(s):  
Glass Fiber ◽  
Barrier Properties ◽  
Hole Diameter ◽  
Fiber Reinforced ◽  
Reinforced Plastics ◽  
Control Factors ◽  
Glass Fiber Reinforced ◽  
Different Temperatures ◽  
Nanoclay Content ◽  
Woven Glass Fiber

The present work deals with the hygrothermal aging of the bolt joints prepared from glass fiber reinforced plastics. To investigate the effect of nanoclay on joint performance, nanoclay content was varied from 0 to 5 wt%, with laminates prepared from 3 wt% of nanoclay content demonstrating the best mechanical properties. Nanoclay acts as a mechanical interlock between the fiber and the epoxy and thus improves the interfacial bonding. A good dispersion of nanoclay also improves moisture barrier properties which in turn reduces the degradation of the composite material hygrothermal conditions. Bolt joints were prepared from woven glass fiber reinforced laminates incorporating 3 wt% of nanoclay content. To design the bolt joint, ASTM D5961 was used and the geometric parameters, i.e. edge distance to hole diameter (E/D) ratio and width to hole diameter (W/D) ratio were fixed to 5 and 6, respectively. Three different temperatures, i.e. 25℃, 50℃ and 75℃ were considered for the aging to three different duration of exposure, i.e. 1, 2 and 3 weeks. The effect of different levels of bolt torque, i.e. 0, 2 and 4 Nm were considered for the failure analysis of the joint. A full factorial design of experiment was conducted on important control factors, i.e. water temperature, exposure time, bolt torque and material variation. It was found that the hygrothermal conditions degraded the material with temperature as the most contributing factor.

Effect of Fiber Content on Failure Modes of Glass Fiber Reinforced Injection Molded Polyamide 66 Composites

2015 ◽  
Vol 1119 ◽  
pp. 296-300
Author(s):  
Ikilem Gocek ◽  
Reyhan Keskin ◽  
Guralp Ozkoc
Keyword(s):  
Glass Fiber ◽  
Failure Modes ◽  
Morphological Structure ◽  
Sem Analysis ◽  
Fiber Reinforced ◽  
Polyamide 66 ◽  
Twin Screw Extrusion ◽  
Glass Fiber Reinforced ◽  
Twin Screw ◽  
Glass Fiber Reinforcement

In the present study, glass fiber reinforced Polyamide 66 composites were produced using laboratory type twin screw extrusion and injection molding processes. The glass fiber reinforcement was applied at 1, 10, 15, 20, 25 and 30 wt% loadings. The morphological structure of the samples and failure modes of glass fiber reinforced Polyamide 66 composites were investigated using scanning electron microscopy (SEM) analysis on fractured surfaces of tensile tested samples in this study.

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