Design and Optimization of Variable Stiffness Composite Cylinders With the Consideration of Manufacturing Interaction

Pan, Helin; Qu, Weiwei; Yang, Di; Huang, Qiwei; Li, Jiangxiong; Ke, Yinglin

doi:10.1007/s10443-021-10007-y

Cited by 4 publications

(2 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the analysis of the above data, it can be seen that SGP has the minimum relative displacement. The relative displacement of the PVB waterproofing agent is the most significant [12] . The same law applies to maximum deformation but not to maximum stress.…”

Section: Test Schemementioning

confidence: 99%

Study on Performance Test of Polymer Waterproof Material in Laminated Glass Building Materials of Steel Structure

2023

AJAGE

View full text Add to dashboard Cite

The apparent viscosity, viscosity-flow activation energy and non-Newtonian viscosity of polyvinyl butyral (PVB) were determined by RS150 plate rheometer. The apparent viscosity of PVB water-resistant resin was studied at different shear rates. In this paper, PVB waterproofing agent is used for laminated glass. The bending resistance of PVB waterproof laminated glass is studied. Two different failure forms are summarized: failure forms in steel bars and floating laminated glass. The effect of the PVB waterproof intermediate layer in the test process is compared. The results show that the laminated glass does not have good bending toughness when the thickness of the intermediate film is less than 0.38 mm. The surface viscosity of PVB water-resistant glass decreases with the e-temperature increase. With the increase of shear rate and shear force, the apparent viscosity of PVB waterproof adhesive decreases gradually. Its Newtonian coefficient is less than 1. And it increases as the temperature increases. It indicates that the water-repellent PVB type exists in the form of a pseudo-plastic liquid. The flexural characteristics of various types of PVB waterproof laminated glass are studied. The chemical composition of the PVB water-resistant material sample was analyzed after bending failure. Based on the comparison of component ratio and molecular weight and the conceptual theory of polymer chemistry, the root cause of the failure was explained.

show abstract

Section: Test Schemementioning

confidence: 99%

Study on Performance Test of Polymer Waterproof Material in Laminated Glass Building Materials of Steel Structure

2023

AJAGE

View full text Add to dashboard Cite

show abstract

“…Optimization studies of fibre angles for variable-stiffness plates have demonstrated significant weight-savings due to enhanced mechanical properties in pre-and post-buckling [19][20][21]; reducing stress concentrations around cutouts [22]; and improving buckling of sandwich panels [23]. Variable-stiffness cylinders have been optimized for bending [24,25], buckling [26,27] and fundamental vibration frequency [28] using linear analyses. However, limited work has investigated the optimization of fibre angle of variable-stiffness cylinders to maximize the nonlinear buckling load in the presence of geometric imperfections.…”

Section: Introductionmentioning

confidence: 99%

Increasing reliability of axially compressed cylinders through stiffness tailoring and optimization

Lincoln

Pirrera

Groh

2023

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

The capabilities of the rapid tow shearing (RTS) process are explored to reduce the well-known imperfection sensitivity of axially compressed cylindrical shells. RTS deposits curvilinear carbon fibre tapes with a fibre-angle-thickness coupling that enables the in situ manufacturing of embedded rings and stringers. By blending the material’s elastic modulus and wall thickness smoothly across the cylindrical surface, the load paths can be redistributed favourably with a minimal-design approach that contains part count and weight while ameliorating imperfection sensitivity. A genetic algorithm that incorporates realistic manufacturing imperfections and axial stiffness penalty is used to maximize the 99.9% reliability load of straight fibre (SF) and RTS cylinders. The axial stiffness penalty ensures that reliability does not come at the expense of stiffness. The first-order second-moment method is used to calculate statistical moments that enable an estimate of the 99.9% reliability load. Due to the fibre-angle-thickness coupling of RTS, buckling data are normalized by mass and thickness. Compared to a quasi-isotropic laminate, which corresponds to the optimal eight-layer design for a perfect cylinder, the optimized SF and RTS laminates have a 6% and 8% greater 99.9% normalized reliability load. By relaxing the axial stiffness penalty, the performance benefit can be increased such that SF and RTS cylinders exceed the 99.9% normalized reliability load of an eight-layer quasi-isotropic laminate by 23% and 37%, respectively. Both improvements (with and without penalty functions) stem largely from a reduction in the variance of the buckling-load distribution, thereby demonstrating the potential of fibre-steered cylinders in reducing the imperfection sensitivity of cylindrical shells. This article is part of the theme issue ‘Probing and dynamics of shock sensitive shells’.

show abstract

Coupled vibration analysis of bolted variable angle tow plates under combined nonlinear effects

Liu,

Sun,

Liu

et al. 2024

Composite Structures

View full text Add to dashboard Cite

Design and Optimization of Variable Stiffness Composite Cylinders With the Consideration of Manufacturing Interaction

Cited by 4 publications

References 34 publications

Study on Performance Test of Polymer Waterproof Material in Laminated Glass Building Materials of Steel Structure

Study on Performance Test of Polymer Waterproof Material in Laminated Glass Building Materials of Steel Structure

Increasing reliability of axially compressed cylinders through stiffness tailoring and optimization

Coupled vibration analysis of bolted variable angle tow plates under combined nonlinear effects

Contact Info

Product

Resources

About