Compressive strength performance of bolt-jionted composite pressure vessel
To fill the application needs for further weight reduction of composite pressure vessels with small aspect ratio,a bolt-jointed large end-opened composite pressure vessel was designed.Taking a diameter of 290 mm pressure vessel as an example,the fiber layer thickness,winding angle,and number of layers of the carbon fiber composite pressure vessels were designed based on network analysis method.The influences of bolts with a diameter of 6.5 mm and materials of TC4 and TC11 respectively on the internal compressive strength of the large end-opened carbon fiber composite pressure vessels were first investigated by hydrostatic test.On the basis,the influences of bolts with diameter of 9 mm and materials of TC4,TC11,and 35CrMnSi on the internal compres-sive strength of the pressure vessels were also investigated.The tests results indicate that when bolt-jointed pressure vessels bear internal pressure,the composite material at the bolted joint is a weak area,the composite material at this location needs to meet the requirements of compression,axial tension,and circumferential bearing,therefore,additional reinforcement is needed.At the same time,bolts need to have sufficient tensile and bending strength.When the material of bolts is the same,as the diameter of the bolts increased,the stress area increased,its tensile and bending strength is greatly improved.By selecting bolts with higher strength mate-rial,the pressure resistances of composite pressure vessels are improved greatly.
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