The effects of ribs in axial compression of CFRP anisogrid cylindrical shell structures

2019 ◽  
Author(s):  
J. Anish Jafrin Thilak ◽  
P. Suresh ◽  
P. Balamurugan
Keyword(s):  
Cylindrical Shell ◽  
Axial Compression ◽  
Shell Structures

Buckling Test of Thin-Walled Metallic Cylindrical Shells Under Locally Distributed Axial Compression Loads

2020 ◽  
Author(s):  
Peng Jiao ◽  
Zhiping Chen ◽  
He Ma ◽  
Delin Zhang ◽  
Jihang Wu ◽  
...  
Keyword(s):  
Cylindrical Shell ◽  
Axial Compression ◽  
Carrying Capacity ◽  
Cylindrical Shells ◽  
Shell Structures ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Loading Case ◽  
Thin Walled ◽  
Buckling Test

Abstract Thin-walled cylindrical shell structure not only shows the highly efficient load carrying capacity but also is vulnerable to buckling instability failure. In practical application, these structures are more easily subjected to locally distributed axial compression load, which is a more common non-uniform loading case. However, until now, the buckling behaviors of thin-walled cylindrical shells under this kind of loading case are still unclear, and there are also few relevant buckling experiments. In order to fill this research gap as well as reveal the relevant failure mechanism of thin-walled cylindrical shell structures, in this paper buckling tests of thin-walled metallic cylindrical shell structures under non-uniform axial compression loads are successfully performed. In this regard, the design and characteristics of two cylindrical shell test specimens subjected to different pattern of non-uniform compression loads are mainly introduced. Meanwhile, as the important parts for conducting this buckling experiment, the axial compression buckling test rig as well as the real-time acquisition measurement system is also presented in details. Results indicate that locally distributed axial compression loads play a pivotal role in the buckling behaviors of thin-walled cylindrical shell, not matter from the point of view of load carrying capacity, shell deformation process or failure mode. The experiments carried out in this work can be served as a benchmark for related numerical simulation afterwards. Furthermore, the obtained test results can also provide some guides for the design and application of thin-walled cylindrical shell in actual engineering.

Asymmetric Postbuckling Behavior of Hemispherical Shell Structure Under Axial Compression

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Shanshuai Wang ◽  
Shuhui Li ◽  
Ji He ◽  
Yixi Zhao
Keyword(s):  
Stainless Steel ◽  
Axial Compression ◽  
Shell Structure ◽  
Load Capacity ◽  
Plastic Hinge ◽  
Shell Structures ◽  
Postbuckling Behavior ◽  
Asymmetric Deformation ◽  
Deformation Stage ◽  
Hemispherical Shell

In real physical experiments, three typical deformation stages including elastic deformation stage, symmetric deformation stage, and asymmetric deformation stage appear step by step when the stainless steel hemispherical shell structure is under axial compression loading. During the asymmetric deformation stage, the rolling-plastic-hinge-radius which characterizes the size of the deformation area evolves along the circumferential direction with the compressive displacement. For the hemispherical shell structures with apparent asymmetric deformation stage, the double-buckling phenomenon of the structures in experiments can be clearly detected. The traditional theoretical analysis based on the assumption with circumferentially constant rolling-plastic-hinge-radius is not suitable to predict this phenomenon. For these hemispherical shell structures, load capacity and absorbed energy predicted by the traditional analysis are usually higher than experimental results in the asymmetric deformation stage. In this paper, a new description based on experimental observation for the evolution of rolling-plastic-hinge-radius has been proposed. Minimum energy principle was employed to obtain the postbuckling behavior. The energy evolution of different buckling stages during compression loading is investigated to evaluate the structure load capacity. Stainless steel hemispherical specimens with different sizes are tested under axial compression between two rigid plates to verify the theoretical modification. Good agreement is achieved between proposed model and experimental results. The theoretical model proposed in this paper can be used in prediction of postbuckling behavior for different deformation patterns in the asymmetric deformation stage. It also provides higher flexibility and efficiency for the postbuckling behavior prediction of hemispherical shell structures.

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