承受斜向壓縮負載薄壁管機械行為之研究

Study on Mechanical Behavior of Thin-walled Tubes under Oblique Compressive Loading

王界平(Chieh-Ping Wang)

指導教授 ： 陳政順

國立臺北科技大學/機電學院/製造科技研究所/碩士(2014年)

https://doi.org/10.6841/NTUT.2014.00897

摘要

本文為研究一種薄壁管件的輕型結構，在承受不同斜向負載下的機械行為，使用有限元素方法模擬方形薄壁管件承受斜向負載的塑性變形，並計算與比較薄壁管承受不同角度負載的比吸能，其結果可以發現能量吸收隨著負載角度的增加而減少。
同時，利用田口方法嘗試尋找方形薄壁管件承受斜向負載的最佳設計參數，分析時以薄壁管件之厚度、寬度、圓角半徑、管件傾斜角為控制因子，並以管件之比吸能為其實驗目標。初步結果顯示影響比吸能的最大因子為管件寬度，其次為圓角半徑與管件傾斜角度，且方形管件的斷面寬度越大可承受較大的負載角度。此外，結果亦顯示，優化設計參數與原始設計比較，比吸能增加75.49%，且可以承受較大的負載角度，13度。希望這項研究可以提供直立薄壁方管承受斜向壓縮負載下能量吸收之設計基礎。

關鍵字

機械行為 ； 薄壁管 ； 比吸能 ； 有限元素分析 ； 田口方法

並列摘要

The purpose of this paper is to study the mechanical behavior response of a light weight structure like thin-walled tubes subjected to compressive loading. The plastic deformation of the upright square thin-walled tubes under oblique compressive loading are conducted based on 3D finite element model. Then the specific energy absorption of structure under different loading angle are computed and compared based on simulation results. It is found that the energy absorption decreases as the angle of apply load increases.
The optimal design parameters of thin-walled tubes subjected to compressive loading are also investigated using the Taguchi method. The main control factors selected are thickness, width, corner radius and the tape angle of the tube. The quality objective considered is the specific energy absorption. In this case study, the results show that the biggest factor affecting the specific energy absorption is width of tube, followed by corner radius and the tape angle of the tube. And tubes can withstand greater load angle with increasing of section width. In addition, the results based on optimal design parameters also show that the specific energy absorption increased 75.49 %, and can withstand greater load angle up to 13 degrees as compared to the original design. It is also hope that the study can provide information for the design of straight thin-walled rectangular tubes as energy absorbers under oblique compressive loading.

並列關鍵字

Mechanical behavior ； Thin-walled tubes ； Specific energy absorption ； Finite Element Method

參考文獻

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