摘要
为了提升体育器械用纤维复材的抗热老化能力,设计了无缺陷和预制缺陷的纤维复材试样,对比分析了不同热老化环境下无缺陷和预制缺陷的纤维复材的密度变化、力学性能、荷载-扰度曲线和主应变分布。结果表明,随着热老化温度上升至120℃及以上时,纤维复材的密度变化率急剧降低;随着热老化时间的延长,纤维复材的密度不断减小,且当热老化时间达到8 d及以上时,密度变化率降低幅度变小。对无缺陷纤维复材进行热老化处理后,纤维复材的弯曲强度和最大荷载会随着热老化温度升高而增大;相较未热老化试件,无缺陷和预制缺陷模式下,热老化都会降低纤维复材试件的弯曲模量和最大荷载。无缺陷模式下,热老化试件未出现明显应力集中现象,而预制缺陷模式下,未热老化试件和热老化试件都出现了应力集中,且相同热老化制度下预制缺陷纤维复材的应力分布均匀程度明显低于无缺陷纤维复材。
In order to improve the thermal aging resistance of fiber composite materials for sports equipment,fiber composite samples without defects and prefabricated defects were designed.The density change,mechanical proper⁃ties,load-disturbance curve and main strain distribution of fiber composite materials without defects and prefabricat⁃ed defects under different thermal aging environments were compared and analyzed.The results show that when the thermal aging temperature rises to 120℃and above,the density change rate of the fiber composite decreases sharp⁃ly.With the increase of thermal aging time,the density of the fiber composite decreases continuously,and when the thermal aging time reaches 8 d or more,the decrease of the density change rate becomes smaller.After the thermal aging treatment of the defect-free fiber composite,the bending strength and maximum load of the fiber composite will increase with the increase of the thermal aging temperature.Compared with non-thermal aging specimens,ther⁃mal aging will reduce the flexural modulus and maximum load of fiber composite specimens in both defect-free and prefabricated defect modes.In the defect-free mode,there is no obvious stress concentration in the thermal aging specimen,while in the prefabricated defect mode,stress concentration occurs in both the non-thermal aging specimen and the thermal aging specimen,and the stress distribution uniformity of the prefabricated defect fiber compos⁃ite under the same thermal aging system is significantly lower than that of the defect-free fiber composite.
作者
张琳
ZHANG Lin(Shaanxi Energy Institute,Xianyang 712000,Shaanxi China)
出处
《粘接》
2025年第10期133-136,共4页
Adhesion
基金
陕西省教育科学“十三五”规划2020年度课题(项目编号:SGH20Y1605)。
关键词
体育器械
纤维复材
预制缺陷
热老化处理
力学性能
sports equipment
fiber composite materials
prefabricated defects
heat aging treatment
mechanical property
