丙組︰電子構裝與力學

工程力學材料分析實驗室  
教授︰潘文峰 分機︰ 06-275757. ext 63342 #26
位置︰工科系館B1(41X06) 傳真︰06-2766549 (系辦傳真)

簡介

研究領域主要在以"彎管試驗機"及"曲度-橢圓化量測器"來測試光滑及凹槽圓管承受循環彎曲負載下的力學行為(彎矩、曲度及橢圓化)及皺曲損壞行為(到達皺曲損壞時的循環次數及橢圓化臨界值)

圓管使用非常廣泛,在海岸邊的導管、臨海建築平台、核子反應爐等等,皆會使用到圓管,因此,分析圓管在海浪的拍打下,受到週期性、海浪速度、水壓的情況下,探討圓管的變形結果。
Kyriakide和他的研究團隊首創的彎管試驗機,做彎管實驗研究,利用液壓圓柱伸長與壓縮,驅動齒輪鍊產生力矩,而對圓管做彎曲實驗,Kyriakide利用LVDT位移量測器、RVDT角度量測器、橢圓化變換器,量取力矩、曲率、橢圓化。

潘文峰教授和他的研究團隊,仿製相同的試驗機,繼續深入圓管研究,調查SUS304不鏽鋼的反應與穩定性,在不同的循環的條件下。

Industrial circular tubular components such as offshore pipelines, platforms in offshore deep water, nuclear reactors, etc., are generally subjected to bending loads. It has been shown that bending of circular tubes leads to the ovalization of the tube cross-section (change of the outside diameter / original outside diameter, Do / Do). Reverse bending and subsequent repeated cyclic bending may cause a gradual growth of ovalization. The increasing ovalization causes a progressive reduction in the bending rigidity of the tube. The tube will buckle when a critical magnitude of ovalization is reached. It is therefore of great importance to understand the variation of ovalization of circular tubes under cyclic bending in many industrial applications.


A Curvature-ovalization Measurement Apparatus for Circular Tubes Under Cyclic Bending.In this paper, the authors report the design and construction of a new measurement apparatus, along with the result of its testing. this apparatus can be plaved at the midspan of the circular tube specimen and is suitable for simultaneous experimental determinations of the tube curvature and ovalization of the tube cross section..

Viscoplastic Collapse of Thin-Walled Tubes Under Cyclic Bending. This paper presents the experimental result on the response and stability of thin-walled tubes subjected to cyclic bending with different curvature-rates. The curvature-ovalization measurement apparatus, designed by Pan et al.(1998), was used for conducting the present curvature-controlled experiments on thin-walled tubular specimens of 304 stainless steel.

An Experimental Study on the Effect of Curvature-Rate at Preloading Stage on Subsequent Creep or Relaxation of Thin-Walled Tubes under Pure Bending. Pure bending with a constant curvature-rate followed by creep (hold constant moment for a period of time) or relaxation (hold constant curvature for a period of time) tests were conducted to investigate the effect of prior curvature-rate at preloading stage on the subsequent creep or relaxation behavior.

The influence of the diameter-to-thickness ratio on the stability of circular tubes under cyclic bending. This paper present the experimental results on the influence of diameter-to-thickness ratio (D/t ratio) to the response and stability of circular tubes subjected to symmetrical cyclic bending. To highlight the influence of the D/t ratio to the response and stability of circular tubes under symmetrical cyclic bending, the raw tubes were slightly machined on the outside surface to obtain the desired D/t ratio.

©2011 Eng. Mat. Mesh. Analysis Lab