scholarly journals Damage localization using shape change in uniform load surface for civil large-span space structures

2018 ◽  
Vol 30 (9) ◽  
pp. 1339-1354
Author(s):  
Guirong Yan ◽  
Tiantian Li ◽  
Jianxin Yu ◽  
Ruoqiang Feng ◽  
Xiaoyun Shao
Keyword(s):  
Shape Change ◽  
Single Layer ◽  
Mode Shapes ◽  
Space Structures ◽  
Damage Localization ◽  
Regular Pattern ◽  
Uniform Load ◽  
Structural Shape ◽  
Large Span ◽  
Load Surface

Civil large-span space structures have been widely built for public assembly venues. The failure of this type of structure may endanger the lives of many people. Considering that the member configuration of this type of structure may follow a regular pattern and damage in a local region may destroy the regular pattern, a damage detection approach based on the change in structural shape has been proposed by the present authors. In that approach, to obtain the change in structural shape due to damage, the displacements at joints between members are required to be measured. Since it is difficult to measure displacements on this type of structure in practice, in this study, the authors proposed to use the shape change of the uniform load surface for damage localization. Uniform load surface physically represents the deflection profile of the structure under the assumed uniformly distributed loading and can be calculated from the flexibility matrix constructed from the identified natural frequencies and mode shapes. This approach can locate damage to exact structural members. It will avoid costly and tedious work in measuring displacements. This approach has been numerically validated on single-layer space structures with two different member configurations.

Locate Damage Based on Change in Structural Shape Calculated From Uniform Load Surface

2016 ◽  
Author(s):  
Guirong Yan ◽  
Jianxin Zu ◽  
Yi Zhao ◽  
Yan Xiao
Keyword(s):  
Single Layer ◽  
Regular Pattern ◽  
Uniform Load ◽  
Structural Shape ◽  
Flexibility Matrix ◽  
Modal Flexibility ◽  
Detection Approach ◽  
Dome Structure ◽  
Load Surface ◽  
Different Levels

Reticulated shell structures have been widely built for public assembly venues, where many people get together during events. Therefore, it is important to conduct condition assessment for this type of structure to ensure the safety of the general public. Considering that the member configuration of this type of structure may follow a regular pattern and damage in a local region may destroy the regular pattern, a damage detection approach based on the change in structural shape is proposed in this study. The change in structural shape can be obtained from the displacement at each joint. Since it may be difficult to measure displacements on this type of structure, it is proposed to use the uniform load surface calculated from the constructed modal flexibility matrix to represent displacements at joints. Therefore, this approach requires the measurement of acceleration responses, instead of displacement measurement. For validating the feasibility of the proposed approach, numerical simulations are conducted on a single-layer dome structure with different levels of damage severity considered. The obtained results verify that the proposed approach is capable of locating damage to exact members.

scholarly journals Experimental Validation of Normalized Uniform Load Surface Curvature Method for Damage Localization

Sensors ◽  
2015 ◽  
Vol 15 (10) ◽  
pp. 26315-26330 ◽  
Author(s):  
Ho-Yeon Jung ◽  
Seung-Hoon Sung ◽  
Hyung-Jo Jung
Keyword(s):  
Experimental Validation ◽  
Surface Curvature ◽  
Damage Localization ◽  
Uniform Load ◽  
Load Surface

Locate damage based on change in structural shape for civil space structures

2016 ◽  
Author(s):  
Guirong Yan ◽  
Jianxin Yu ◽  
Yi Zhao ◽  
Ruoqiang Feng
Keyword(s):  
Space Structures ◽  
Structural Shape

Springback Analysis in Hybrid Material Deformation

2018 ◽  
Author(s):  
Elizabeth M. Mamros ◽  
Chetan P. Nikhare
Keyword(s):  
Hybrid Materials ◽  
Material Properties ◽  
Shape Change ◽  
Single Layer ◽  
Metal Composite ◽  
Composite Sandwich ◽  
Composite Layers ◽  
Different Types ◽  
Reduction Methods ◽  
Manufacturing Problems

In the automotive and aerospace industries, cost and overall weight are major opponents that are affecting design opportunities. Research to investigate possible cost and weight reduction methods is continuously being performed focusing especially on the hybrid materials being used to manufacture parts. Currently, different types of metals with polymers are being chosen to make punched parts, but the deformation of the materials has not been fully investigated. The way that the material deforms will dictate the material properties held by the subsequent parts. Without knowing these material properties, it is difficult to prevent manufacturing problems during various processes. One major problem encountered when forming solid metal parts is that when the die is removed, the deformed parts change shape due to the elastic properties of the material. This shape change is called springback. This undesirable result causes the parts to be the incorrect shape and to not align correctly during assembly. One possible solution would be to investigate the material properties of trilayer hybrid materials consisting of metal and composite layers adjoined by adhesive. Trilayer channels will be tested by punching and measuring the resulting springback. Two different trilayer design setups will be tested, composite metal composite sandwich and metal composite metal sandwich, and will be compared with the deformation in a single layer metal channel. The outcome of these tests will determine which trilayer design will have the greatest success in reducing the undesirable springback effects.

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