Mechanical Study of Carbon Fiber Reinforced Plastic and Thin-walled Metal Liner in Bi-Material COPV Based on Grid Theory Optimization

Abstract

Composite over-wrapped pressure vessel (COPV) with ultra-thin metal liner and high strength carbon fiber reinforced plastic (CFRP) structure was widely used in space system. Meanwhile, there are some difficulties in the calculation of COPV stress-strain state related to the elastic-plastic liner and elastic composite. In this paper a novel design theory was proposed for calculating stress distribution in the bi-material COPV and determining the optimal thickness parameters of COPV based on traditional grid theory optimization. This new theory named Parameters Correspondence Relationship Structure Design Method (PCRSDM) can increase the design precision and structure performance factor of COPV compared to traditional grid theory. The correct models of mechanical characteristic between liner and CFRP are established from the view of optimized grid theory, the present theory is useful to develop a theoretical framework to calculate and design the COPV double shells. The COPV stress-strain behavior is also systemically studied by the ANSYS finite element analysis (FEA), the results show good agreement between FEA simulation and PCRSDM calculation. Both FEA and PCRSDM can meet the design requirements of COPV. A complete design, development and qualification testing of a specialized COPV used to satellite propulsion system was successfully conducted to verify the COPV design in terms of PCRSDM and FEA, the result show that PCRSDM is suitable for the design of COPV.

Application of Particle Swarm Algorithm in Nanoscale Damage Detection and Identification of Steel Structure

“…Ebrahim et al With the background of numerical simulation and model testing, the damage identification of the structure under noise is studied, and a damage detection method based on the modal multiresolution complexity spectrum is proposed [ 4 ]. Yu et al used the mode shape change before and after structural damage to identify the continuous beam and achieved good results [ 5 ]. Kortenbruck et al for the first time, based on the numerical simulation of beam structures damage identification was carried out according to the change of flexibility before and after damage [ 6 ].…”

Influence of Heavy Weight Drill Pipe Material and Drill Bit Manufacturing Errors on Stress State of Steel Blades

“…Among a number of currently known materials used for weighted drill pipes, composite carbon drill pipes [102] have shown minimal sensitivity to the geometric imperfection of the bit. Researchers [103][104][105][106][107] study the mechanical properties of polymers and the stress state, but there is no data on the operation of the drill string of pipes made of composite carbon materials and the bit. Analysis of the bit-well contact interaction during operation in non-standard mode allowed assessing the non-standard stresses that occur in the blades of the bit.…”