Çiçek Özes

Effect of T-Joint Geometry on the Performance of a GRP/PVC Sandwich System Subjected to Tension

Mechanical performances of six sandwich type T-joints, used in marine applications subjected to tensile load, have been investigated both numerically and experimentally in this study T-joints, each with different geometries, have been manufactured, Type A: continuous core in join with right angle; Type B: core removed at joint; Type C: core with wedge fillet; Type D: core with 25 mm radius fillet; Type E: core with 70 mm radius fillet and Type F: DK-CND1 of Toftegaard and Lystrup with overlaminate. The skin was a 5mm thick orthophitalic polyester/glass laminated composite and the core was PVC (Divinycell H80). Due to absolute values of the maximum strain values of the T-joints, Type E shows promising performance under tension while Type B is the weakest. It is not recommended to use Type B in the structures subjected to tension. Grading from the strongest to the weakest of T-joints is Type C, D, A and F. Results of the numerical modelling and tests also affirm the utility of the 2D FE models for further studies of the strain distribution in such sandwich T-joints.

Determination of the Mechanical Properties of Friction Welded Tube Yoke and Tube Joint

This paper deals with the friction welding of the tube yoke and the tube of the drive shaft used in light commercial vehicles. Tube yoke made from hot forged microalloyed steel and the tube made from cold drawn steel, with a ratio (thickness/outside diameter ratio) of less than 0.1, were successfully welded by friction welding method. Hardness distributions on both sides of the welded joint across the welding interface were determined and the microstructure of the joint was investigated. Furthermore, joint strength was tested under tensile, static torsional, and torsional fatigue loadings. The tested data were analyzed by Weibull distribution. The maximum hardness value along the welded joint was detected as 553 Hv1. The lowest detected tensile strength of the joint was 13% less than the base materials’ tensile strength. The torsional load carrying capacity of the friction welded thin walled tubular joint without any damage was obtained as 4.252,5 Nm in 95% confidence interval. After conducting fully reversed torsional fatigue tests, the fatigue life of friction welded tubular joints was detected as 220.066,3 cycles.

An investigation on woven-glass fiber-reinforced epoxy laminate conveyor chain components

This article is concerned with the experimental and numerical results of the stress analysis in woven-glass fiber-reinforced conveying chain components. The effects of various loading conditions on the stress of a pin-loaded composite component are investigated. For the experimental study, an apparatus had been developed to simulate chain components in real motion, and two different loading conditions of the chain component have been investigated. The first condition represents the movement of the chain components without loading, while in the second condition, the chain component tand moves the load. The finite element code ANSYS has been used to perform the numerical analysis using three-dimensional eight-noded layered structural solid elements. The chain tensile forces loaded through pins are chosen to be 300, 600, 900, and 1200 N for the two conditions of the chain components. Comparisons are made between the numerical and the experimental studies for the two different conditions. The experimental and numerical results show that at the second loading condition the stress values increase by increasing the tensile force.