圓管承受循環彎曲負載截面變形量測器之設計

A Design of Section-Deformation Measurement Apparatus for Circular Tubes Under Cyclic Bending

本文提出一個新設計的量測裝置，該裝置可用來量測圓管承受循環彎曲負載時圓管截面的變形量。該量測裝置係由八個LVDT位移檢測器所組成，其中八個位移檢測器對稱的安置於測試圓管截面的四周。根據八個位移檢測器所測得的訊號，可得到圓管截面的變形量。此外，八個位移檢測器可在位移的方向作適度的調整，因此，不同尺寸之圓管截面的變形量也可以量測。本文測試在承受曲率控制的循環彎曲負載下之兩種不同尺寸的SUS 304不銹鋼管，以驗證新設計的量測裝置。經由測試的結果發現，整個負載過程中圓管截面上八個不同點的變形量都可以測得，而且根據所測得的結果，圓管的截面變形可適當的描繪出來。

This paper presents a newly designed apparatus which can be used to measure the deformation of the cross-sectional area of circular tubes subjected to cyclic bending. The measurement apparatus is composed of eight LVDTs, which are symmetrically set on the circumference of the tube. Based on the detected signals from these eight LVDTs, the deformation of the tube cross-section can be obtained. In addition, the eight LVDTs can be adjusted in the radial direction of the tube. Therefore, the section deformation of different sizes of circular tubes can be determined. In this paper, two different sizes of SUS 304 stainless steel tubes under curvature-controlled cyclic bending were used to test the newly designed apparatus. It has been shown that the deformation at eight different points of each tube cross-section was detected during the loading process. Thus, based on the detected data, the deformation of each tube’s cross-section was properly described.