Study on stress distribution of tangent split high pressure apparatus and its pressure bearing capacity

• We study the tangent split WC cylinder on the basis of the belt-type apparatus.
• This split structure can eliminate the tangential tensile stress of the cylinder.
• The tangent split cylinder has smaller equivalent stress than the belt-type cylinder.
• The pressure capacity of tangent split die is about 1.4 times than belt-type die.

The ultra-high pressure device with tangent split tungsten carbide cylinder is investigated on the basis of the belt-type apparatus. The cylinder is divided into six blocks and the dividing line is tangent to the inscribed circle of the regular hexagon inner hole. Then the divided bodies assemble the high pressure cylinder. This structure of cylinder eliminates the tangential tensile stress and produces a great tangential compress stress through the friction and squeeze each other on the contact surface between the divided bodies. Simulation results show that the maximum shear stress and equivalent stress on the tangent split cylinder are much smaller than those on the belt-type cylinder. The principal stresses on the inner wall of the tangent split cylinder are all compressive stresses. And the situation that compressive stress is in three directions is akin to the condition of hydrostatic pressure, the best condition for tungsten carbide materials. The experiment results also prove that the tangent split die can bear higher oil pressure than the belt-type die.

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