超音波法於支撐鋼管材料受疲勞載重之安全評估
Date Issued
2005
Date
2005
Author(s)
王奐欽
DOI
zh-TW
Abstract
This work makes use of ultrasound detection method to identify fatigue damage in steel tubes caused by cyclic loading. From characteristic changes in the ultrasonic wave, we attempt to determine the safety lifespan of steel tubes that are common used as support frame in construction sites. By analyzing the change in phase velocity, we found that with increasing uniform cyclic compressional loading, the critical buckling load of the tube undergoes plastic hardening and strength of the tube increases. If the loading continues, the tube starts to weaken. We start by using the theoretical analysis of wave propagation in tube to verify the results of our experiment, following this; we further verify our experimental results using simulation results obtained using finite element analysis software, ANSYS. From the experimental result, we devise a method to evaluate the safety of steel tube by analyzing the change in phase velocity, improving the safety standards of supporting frame.
Subjects
非破壞檢測
超音波檢測法
有限元素
疲勞破壞
FFT轉換
Buckling load
Fatigue damage
Finite element
Safety evaluation
Type
thesis
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