Haiyang Du

Hebei University of Engineering, China · Engineering Mechanics

A new kind of smart mandrels (shape memory polymer (SMP) mandrels) have been demonstrated to make up the drawbacks of traditionally mandrels (multi-pieces metal mandrel, water-soluble mandrel and elastomeric mandrel), such as time-consuming, high cost, and difficulty to remove. In the paper, the styrene-based SMP has been used to design and manufac...

Styrene-based shape memory polymer (SMP) tubes were fabricated and their basic mechanical properties in different deformation states were investigated. The tensile, compression, bending and twisting shape memory properties of the tubes were analyzed and discussed, and the results indicated that SMP tubes exhibit good shape fixity ratio and shape re...

The work describes a new concept of shape memory polymer (SMP) mandrel to manufacture a complex shaped filament wound carbon composite air duct. The mandrel is designed, fabricated and tested to verify the shape recovery and extraction characteristics for the manufacturing of the composite structure. A finite Element model is developed to predict t...

Based on the thermomechanical mechanism of shape memory polymers (SMPs), the three-dimensional thermomechanical constitutive equation that can be used in the ABAQUS finite element simulation was derived. Then this paper compiled UMAT subroutine and simulated the thermomechanical behaviors of SMP smart mandrels. In addition, the properties of shape...

Shape memory polymer composites (SMPC) release device can be fabricated to solve the disadvantages of traditional explosive release device, such as large weight, bad stability, and strong impact force and damage due to explosion. The release device is made up of two thin-walled tubes, the first one is responsible for the torsion, and the second is...

A finite element model is constructed to analyze the steady heat conduction and thermal stress in a ceramic/FGM/metal composite EFBF plate under convective heat transfer boundary. From numerical calculation, when ζa=ζb=1, T0=Ta =300K and Tb=1 800K, the steady heat conduction and thermal stress distributions in the plate were obtained. The numerical...

A finite element model is constructed to analyze the steady temperature field in a ceramic/metal composite FGM plate under heating boundary. From numerical calculation, when T₀ = T_a = 300 K and T_b = 1 800 K, the steady temperature field distributions in the plate were obtained. The numerical results show that the te...

The convective heat transfer steady heat conduction in a Ti-6Al-4V/ZrO₂ composite FGM plate considered temperature dependency was analyzed by nonlinear finite element method. From numerical calculation, when, T0 = 300 K, Ta = 500 K and Tb = 1 650 K, the steady heat conduction distributions in the plate were obtained. The numerical result...