扩展有限元法 (XFEM) 模型,用于在使用添加无机填充剂的粘合剂粘合的关节中存在的损伤机制
João P J R Santos1, Daniel S Correia1, Eduardo A S Marques2
1Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI), University of Porto, Rua Dr. Roberto Frias 400, 4200-465 Porto, Portugal.
Materials (Basel, Switzerland)
|December 9, 2023
概括
将空洞玻璃颗粒添加到环氧粘合剂中,可以提高汽车和航空航天应用中的关节稳定性和可预测性. 这项数值研究准确地模拟了填充器如何将故障模式转换为凝聚性,改善结构完整性的预测.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 结构分析 结构分析
背景情况:
- 粘合剂粘合在汽车和航空航天行业对于轻质,高强度结构至关重要.
- 控制故障模式 (凝聚与粘合) 对于可预测的关节性能至关重要.
- 无机填充剂可以改变粘合性质,但它们的精确影响需要详细研究.
研究的目的:
- 开发一种数字技术,用于预测无机填充剂的粘合剂接头的故障模式和强度.
- 为了研究空心玻璃颗粒对以环氧为基础的单 lap 关节的行为的影响.
- 验证数值预测与实验数据对关节强度和故障模式的验证.
主要方法:
- 在不同度的环氧粘合剂中引入空心玻璃颗粒.
- 在负载下对单个膝关节样本的数值模拟.
- 对整洁和填充的粘合剂接头进行实验测试.
- 对故障负载,位移和故障模式的数值和实验结果进行比较.
主要成果:
- 添加空洞玻璃颗粒促进了从粘合剂到凝聚性故障模式的转变.
- 填充的粘合剂接头显示出故障负载的变化显著减少 (约. 2%) 和流离失所 (大约. 10%) 与纯粘合剂 (9%和20%) 相比.
- 虽然强度和可塑性随着填充剂的添加而下降,但数值模型准确地捕获了一般的实验行为.
结论:
- 数字技术有效地预测了使用空洞玻璃颗粒填充剂的粘合剂接头的行为.
- 空洞玻璃颗粒提高了关节故障模式的可预测性,并减少了性能的变化.
- 这项研究为在苛刻的行业中设计可靠和高效的债券结构提供了有价值的工具.
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