Experimental and Numerical Simulation of the Mechanical Behavior of Thin-Walled Steel Cylinders under Quasi-Static and Dynamic Loads

• Main Authors: Hsin-PeiWang, 王馨珮
• Other Authors: Hsuan-Teh Hu
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/zekytn

碩士 === 國立成功大學 === 土木工程學系 === 105 === Thin-walled cylinders have been one of the most commonly used energy-absorbing components in many structures which are due to their high strength, low cost and great capabilities of energy absorption. Therefore, the research takes thin-walled tubes as the object of study. The main objectives of the research are (1) to study the behavior of thin walled steel tube subjected to quasi-static and dynamic axial loading. (2) to explore the factor that will lead to discrepancy between experiment and numerical simulation. (3) to validate the accuracy of numerical model through comparing the results among experiment, numerical simulation and DIC. The research explores the mechanical behavior of thin-walled tube under quasi-static and dynamic loads by MTS and SHPB respectively, and found that peak load will increase when impact velocity increase simultaneously because of strain rate effect. Moreover, the load-displacement curve is irregular relative to static condition since dynamic plastic buckling occurs under dynamic condition. Then, establish numerical model by LS-DYNA to predict the crushing conditions. By comparing the simulated results with experiment reveals that some factors such as material property, imperfection mode and boundary condition might lead to discrepancy between experiment and numerical simulation. Hence, the research sets up a more realistic numerical model and obtains the simulated results which give good agreement with the experimental results in both static and dynamic conditions.