采用直接压痕法测定了钠钙硅酸盐玻璃和一种TiC颗粒增强A12O3复合材料的断裂韧性.研究表明,在同一压痕压制荷载下测得的同一种材料的压痕韧性呈现出较大离散性,可以采用Weibull分布加以较好地描述.对两种材料的试验数据的对比分析指出,压痕韧性测试值的离散性反映了材料显微结构的不均匀性对材料局部裂纹扩展阻力的影响.基于这一分析,本文建议采用直接压痕法测定材料断裂韧性时,应尽可能增大试验量,从而对压痕韧性测试结果的统计性质作出完整描述.
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