在激光消光下预应力CFRP光束的故障机制
Yuting Zhao1, Ruokun Zhang1, Zhuhua Tan1
1School of Mechanical Engineering, Hebei University of Technology, Tianjin 300400, China.
Polymers
|August 14, 2025
概括
预应力碳纤维增强聚合物 (CFRP) 梁在压缩中失败,原因是热的软化,而不是表面的剥离. 增加压力前负荷显著减少了激光切除过程中的故障时间.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 激光材料加工 激光材料加工
背景情况:
- 碳纤维增强聚合物 (CFRP) 是一种先进的复合材料.
- 了解激光切除等极端条件下的故障机制对于结构完整性至关重要.
- 预应力可以改变材料在负载下的行为.
研究的目的:
- 为了研究经过激光切除的预应力CFRP悬臂梁的故障机制.
- 分析激光功率密度和预应力负载对故障时间的影响.
- 为了确定激光消光的CFRP光束中故障的主要原因.
主要方法:
- 在不同激光功率密度 (500-1500 W·cm-2) 下对预应力CFRP悬臂梁进行实验测试.
- 在CFRP梁上施加预应力负荷 (300-750N·cm).
- 扫描电子显微镜 (SEM) 分析切除区域和断裂表面.
主要成果:
- 碳复合材料梁由于底面的压缩而失败,这是由热量软化和局部刚度/强度降低引起的.
- 故障并没有归因于顶部表面的直接除损伤.
- 故障时间从19.64秒缩短到6.52秒,随着功率密度和压力前的增加.
- 预应力负载对故障时间的影响比功率密度更大.
结论:
- 热引起的软化是激光消光下CFRP故障的关键因素,导致光束底部的压缩故障.
- 前应力加载显著加快故障时间,突出其在预测CFRP行为的重要性.
- 该研究提供了关于CFRP复合材料暴露在激光诱导的热应力下的复杂故障模式的见解.
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