相关实验视频
Updated: Jul 2, 2025

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Ultrasonic Fatigue Testing in the Tension-Compression Mode
Published on: March 7, 2018
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通过循环或动态疲劳测试获得的Y-TZP的亚临界增长参数的比较
Karen Akemi Fukushima1, Abdulaziz Alhotan2, Sahar Ganz Riman1
1Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, Av. Prof. Lineu Prestes, 2227, Cidade Universitária, São Paulo, SP 05508-000, Brazil.
概括
在循环和动态疲劳测试中,Y-TZP的应力腐蚀系数 (n) 是相似的. 在循环疲劳测试中,材料寿命不受频率或应力水平的影响.
科学领域:
- 材料科学 材料科学 材料科学
- 生物材料工程 生物材料工程
- 陶制品 在陶方面.
背景情况:
- 伊特里亚稳定四角形合金多晶 (Y-TZP) 是广泛用于牙科和结构应用的陶.
- 了解Y-TZP在疲劳下对缓慢裂纹生长 (SCG) 的抵抗,对于预测其长期耐用性至关重要.
- 疲劳测试方法,包括循环和动态方法,为材料降解机制提供了洞察力.
研究的目的:
- 用循环和动态疲劳试验比较Y-TZP的应力腐蚀系数 (n).
- 为了评估测试频率对Y-TZP在循环疲劳下特性寿命的影响.
- 研究Y-TZP.中循环疲劳和缓慢裂生长之间的潜在相互作用.
主要方法:
- 145个Y-TZP标本在四点曲配置中接受了动态疲劳 (n=70) 和循环疲劳 (n=75) 测试.
- 循环疲劳测试以2Hz和10Hz的频率进行,应力水平在350到600MPa之间.
- 用ASTM C 1368-00公式,韦布尔统计数据和通用日志线性模型分析数据;通过SEM检查骨折表面.
主要成果:
- 从动态 (n=54) 和循环疲劳 (n=48在2 Hz,n=40在10 Hz) 测试中获得的应力腐蚀系数 (n) 值没有显示出统计学上显著的差异.
- 韦布尔参数 (m, σ0, σ5%) 表示材料可靠性,在两种频率下观察到周期性疲劳的类似参数.
- 一般日志线性模型显示,频率,压力水平或它们的相互作用对周期性疲劳下的Y-TZP寿命没有显著的影响.
结论:
- 循环和动态疲劳测试为Y-TZP提供了可比的应力腐蚀系数.
- 测试频率在测试范围 (2-10 Hz) 内的测试频率对Y-TZP的特性寿命没有显著的影响.
- 没有检测到循环疲劳和缓慢裂生长之间的相互作用效应,这表明在测试条件下具有一致的降解行为.
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