权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Mechanical Evaluation of High-Strength and High-Modulus Fibers and Influence of Environment of Fracture Behavior

高强高模纤维的力学评价及断裂行为环境影响

基本信息

批准号：
06452148
负责人：
KOMAI Kenjiro
金额：
$ 4.74万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452148/
关键词：
High-Strength and High Modulus Fiber Ceramic Fiber Aramid Fiber Fracture Single Fiber Test Environmental Strength Atomic Force Microscope Atomic Force Microscope 原子間力顕微鏡複合材料強化繊維

项目摘要

High-strength and high-elastic modulus fibers are gaining increasing demand for further technological areas. This investigation demonstrates the fracture behavior of single fiber including environmental influences of water, vacuum, electron radiation, and ultra-violet radiation. Fiber damage was closely examined by using high-resolution scanning electron microscope and atomic force microscope. The fibers investigated were ceramic precursor fiber including alumina (Altex by Sumitomo) , SiC (Nicalon by Nippon Carbon) and Si-C-Ti-O (Tyranno by Ube) , and organic fibers, aramid fibers of Kevlar by Du Pont and Technora by Teijin.The single ceramic fiber strength decreased with increasing water content in an environment and with decreasing displacement rate. Nanoscopic evaluation of single fiber surface by AFM showed that water molecule induced slow crack growth, resulting in a decrease in fiber strength. As for aramid fibers, the longitudinal tensile strength and longitudinal and transverse elastic modulus decreased by water absorption and ultraviolet radiation. However, a decrease of mechanical properties by electron radiation was small. The longitudinal tensile strength also decreased in vacuum, and its decrease was promoted by changing an environment from vacuum to air. Nanoscopic evaluation by using AFM showed that surface damage including "nodule" and "graves" was promoted by water absorption, ultraviolet radiation and vacuum environment, and it promoted fiber splitting, resulting in mechanical properties of aramid fibers.

高强度和高弹性模量纤维在其他技术领域的需求日益增加。本研究展示了单根纤维的断裂行为，包括水、真空、电子辐射和紫外线辐射的环境影响。用高分辨扫描电子显微镜和原子力显微镜对纤维损伤进行了观察。研究了氧化铝（Altex，Sumitomo）、SiC（Nicalon，Nippon Carbon）、Si-C-Ti-O（Tyranno，Ube）等陶瓷先驱体纤维，以及有机纤维、芳纶纤维（Kevlar，Du蓬特）和Technora（Teijin）等纤维的单根强度随环境含水量的增加和置换率的降低而降低。单纤维表面的AFM纳米评价表明，水分子诱导缓慢的裂纹扩展，导致纤维强度下降。芳纶纤维的纵向拉伸强度和纵横向弹性模量因吸水和紫外线照射而降低。然而，通过电子辐射的机械性能的降低是小的。纵向拉伸强度在真空中也降低，并且通过将环境从真空改变为空气促进其降低。利用原子力显微镜进行纳米级评估表明，吸水、紫外线辐射和真空环境会促进“结节”和“坟墓”等表面损伤，促进纤维分裂，从而导致芳纶纤维的力学性能。