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首页> 外文会议>European Conference on Fracture >Determination of strength and fracture toughness of small ceramic discs using the small punch test and the ball-on-three-balls test
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Determination of strength and fracture toughness of small ceramic discs using the small punch test and the ball-on-three-balls test

机译：使用小冲孔试验和三对球试验测定小陶瓷盘的强度和断裂韧性

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摘要

The strength and fracture toughness of small ceramic discs under biaxial flexural load are investigated with two different miniaturized test methods: the small punch test (SPT) and the ball-on-three-balls test (B3B). An alumina ceramic was chosen as sample material. While the specimen geometries are identical for both tests, the experimental set-ups and the stress fields are different. First, the Weibull parameters of strength have been estimated. Second, the fracture toughness is evaluated with an adaption of the surface crack in flexure (SCF) method. The discs are prepared with artificial surface cracks whose sizes have to be measured. The evaluation of stresses and stress intensity factors is based on finite element calculations.
机译：通过两种不同的小型化测试方法，研究了小型陶瓷圆盘在双轴弯曲载荷下的强度和断裂韧性：小冲头测试（SPT）和三对球测试（B3B）。选择氧化铝陶瓷作为样品材料。尽管两种测试的样品几何形状都相同，但实验设置和应力场却不同。首先，已经估计了强度的威布尔参数。其次，通过表面挠曲裂缝（SCF）方法的适应性来评估断裂韧性。圆盘准备有必须测量尺寸的人造表面裂纹。应力和应力强度因子的评估是基于有限元计算的。

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