Experimental and Statistical Analysis of Fatigue Behavior in Zr-based Bulk Metallic Glass

Zr基大块金属玻璃疲劳实验与概率寿命预测

Three-point bending fatigue experiments were conducted on a typical Zr-based bulk metallic glass(BMG)at ambient temperature to investigate the fatigue behavior under cyclic loading conditions.Results show that the stress amplitude-cycles to failure(S-N)curve of the Zr-based BMG is determined,and the fatigue endurance limit is 442 MPa(stress amplitude).To evaluate the probability-stress amplitude-cycles to failure(P-S-N)curve,an estimation method based on maximum likelihood was proposed,which relies on statistical principles to estimate the fatigue life of the material and allows for a reduction in the number of samples required,offering a cost-effective and efficient alternative to traditional testing methods.The experimental results align with the American Society for Testing and Materials(ASTM)standard,indicating the reliability and accuracy of this estimation method in evaluating the fatigue behavior of Zr-based BMG.

对Zr基大块金属玻璃(BMG)进行了室温下三点弯曲疲劳实验,旨在探究其在循环载荷下的疲劳行为。结果表明,根据确定的应力幅度-破坏循环(S-N)曲线,Zr基BMG的疲劳极限为442 MPa。为评估P-S-N曲线,提出了一种基于最大似然原理的估算方法,利用统计原理预测材料疲劳寿命,减少了所需样本数量,降低了实验成本。实验结果与美国测试和材料协会(ASTM)标准相符,证明了估算方法的可靠性和准确性。