期刊
POLYMERS
卷 13, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/polym13111884
关键词
drilling point angle; thermal and mechanical analysis; delamination assessments; regression models and optimization; woven glass fiber composites; drilling of composite
资金
- National Science, Technology, and Innovation Plan (NSTIP) strategic technologies program in the Kingdom of Saudi Arabia [15-ADV4307-03]
This study investigates the effects of drilling factors on the thermal-mechanical properties and delamination of glass fiber reinforced polymer (GFRP) experimentally. The results demonstrate significant relationships between drilling factors and responses, with feed having a greater impact on thrust force compared to speed. All machining parameters significantly affect the measured temperature, with laminate thickness making the largest contribution.
This manuscript aims to study the effects of drilling factors on the thermal-mechanical properties and delamination experimentally during the drilling of glass fiber reinforced polymer (GFRP). Drilling studies were carried out using a CNC machine under dry cutting conditions by 6 mm diameter with different point angles of null = 100 degrees, 118 degrees, and 140 degrees. The drill spindle speed (400, 800, 1600 rpm), feed (0.025, 0.05, 0.1, 0.2 mm/r), and sample thickness (2.6, 5.3, and 7.7 mm) are considered in the analysis. Heat affected zone (HAZ) generated by drilling was measured using a thermal infrared camera and two K-thermocouples installed in the internal coolant holes of the drill. Therefore, two setups were used; the first is with a rotating drill and fixed specimen holder, and the second is with a rotating holder and fixed drill bit. To measure thrust force/torque through drilling, the Kistler dynamometer model 9272 was utilized. Pull-in and push-out delamination were evaluated based on the image analyzed by an AutoCAD technique. The regression models and multivariable regression analysis were developed to find relations between the drilling factors and responses. The results illustrate the significant relations between drilling factors and drilling responses such as thrust force, delamination, and heat affect zone. It was observed that the thrust force is more inspired by feed; however, the speed effect is more trivial and marginal on the thrust force. All machining parameters have a significant effect on the measured temperature, and the largest contribution is of the laminate thickness (33.14%), followed by speed and feed (29.00% and 15.10%, respectively), ended by the lowest contribution of the drill point angle (11.85%).
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