Effect of Plastic Strain Energy Density on Polymer Optical Fiber Power Losses

• Main Authors: Chang, Hua-Chun, 張華均
• Other Authors: Chen, Yung-Chuan
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/94895911264870414762

碩士 === 國立屏東科技大學 === 車輛工程系碩士班 === 94 === This thesis explores the dependence of power losses on average plastic energy densities (APED) as rays propagate along deformed polymer optical fibers (POFs). The effects of various bend radii, elongation speeds, and temperatures on the power losses in the deformed POFs are explored. The power losses in the deformed POFs are analyzed both experimentally and numerically. Three-dimensional elastic-plastic finite element models are used to simulate the plastic deformation of deformed POFs. Contact elements are used to model the interaction between the POF and disc. The results indicate that bending elongation significantly affects the power loss of a POF. The power loss becomes obvious as the elongation increases. The power loss decreases either as the elongation speed decreases or as the temperature increases. The results also indicate that the APED introduced in a deformed POF can be considered as a key index to study the power loss. The APED can be calculated from the measured data in a tensile test. Based on the experimental results, a curve-fitted equation is proposed to estimate the power loss using the average plastic energy density for various bend radii, elongation speeds and temperatures. A good agreement between the measured results and the results simulated from the proposed model is obtained. The maximum difference is less than 6 %.