非線性材料應用於彎曲護套之應力分析

Analysis of Nonlinear Material Used in The Stress-Relief Bending Boots

黃建富(Chien-Fu Huang)

指導教授 ： 林依恩

國立虎尾科技大學/工程學院/機械與機電工程研究所/碩士(2014年)

摘要

彎曲損耗是光纖傳輸的主要損耗。當光纖彎曲曲率過大時，光纖的光損耗會急劇的上升。故國內外的光纖通訊廠商，通常會為光纖纜線的前後兩端增加一彎曲護套。

本論文探討由熱塑性橡膠所製成的彎曲護套，搭配光纖纜線在受力負荷0.7kgf彎曲時，其對於光損耗的影響。本文依據超彈性體模型與單軸拉伸實驗，進行材料參數擬合。再透過有限元素分析與光纖傳輸實驗，相互驗證。制定彎曲曲率與Comp 22 Cauchy stress為修改彎曲護套的準則。最後透過有限元素分析探討彎曲護套的參數，如材質、槽寬、槽數、厚度，對於彎曲曲率與Comp 22 Cauchy stress的影響。在各別探討上述的參數，其結果說明槽數為重要的因子。而若同時修改多參數，將相對應於光纜產生最大彎曲部分的彎曲護套的槽進行填補，並且在此區域增加厚度。可使光纜受負荷時的彎曲曲率有明顯的降低。

關鍵字

非線性材料 ； 超彈性體 ； 彎曲護套 ； 光損耗 ； 有限元素分析

並列摘要

Bending loss is a major loss of the fiber transmission. When the fiber has a large curvature, optical losses of the fiber will increase sharply. Therefore, domestic and foreign manufacturers of fiber-optic communications usually add to stress-relief bending boots on front and rear ends of the fiber cable.

This paper main study the stress-relief bending boots made of thermoplastic rubber, for fiber-optic cables in the bending force is 0.7kgf and influence on the optical loss. In this paper, material parameter fitting based on super-elastic model and uniaxial tensile tests. The finite element analysis and optical transmission experiments are adopted to mutual authentication. Selecting curvature and Comp 22 Cauchy stress is criterion of modification. The main objectives are due to finite element to investigate stress-relief bending boots parameters such as material, width, number of slots, thick. It influence on the curvature and Comp 22 Cauchy Stress. Discussion of the respective parameters described above, the results indicate that the number of slots is an important factor. If you want to modify multiple parameters simultaneously, you better that will correspond to the greatest bending of the cable to the stress-relief bending boots of the bent portion to fill the slot, and increasing the thickness of the thickened region in this area. when the cable was loaded, Curvature was reduced significantly.

並列關鍵字

nonlinear material ； Super elastomer ； stress-relief bending boots ； Optical loss ； Finite Element Analysis

參考文獻

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United States Patent 5030135,July

[7]Eric J. Repta,1995,"FIBER OPTIC CABLE CONNECTOR WITH

STRAIN RELIEF BOOT", United States Patent 5390272,

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