Abstract The influence of test sample geometry on the fracture toughness measurements of bulk metallic glasses (BMGs) is systematically quantified. Through a combination of thermoplastic forming based toughness measurements and numerical simulations, we investigated the effects of test sample thickness, width, and notch precision on the fracture toughness of BMGs. Considering these findings, together with BMGs' specific fabrication challenges and potential application geometries, we propose that sample geometry to measure fracture toughness of BMGs should be much smaller and practically achievable than suggested by standards for crystalline alloys.

中文翻译：

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用于测量大块金属玻璃断裂韧性的测试样品几何形状

摘要 系统地量化了试样几何形状对块状金属玻璃 (BMG) 断裂韧性测量的影响。通过结合基于热塑性成型的韧性测量和数值模拟，我们研究了试样厚度、宽度和缺口精度对 BMG 断裂韧性的影响。考虑到这些发现，再加上 BMG 的特定制造挑战和潜在的应用几何形状，我们建议测量 BMG 断裂韧性的样品几何形状应该比晶体合金标准建议的要小得多，并且实际上可以实现。