With three-point bending (3 PB) approach, nonlinear large-deflection deformation in bending was investigated for Zr₆₁Ti₂Cu₂₅Al₁₂ (ZT1) metallic glass (MG) beams with varying thickness from 1 mm to 100 μm. It was shown that higher flexibility is achievable by increasing the span-to-thickness ratio, which is desired for flexible members subjected to large-deflection performance. Moreover, yielding event of the MG beams in large-deflection situation can be captured via a conversion of load-deflection response into the non-dimensional form. Meanwhile, intrinsic sources responsible for the buckling events can be justified in terms of theoretical analytical solutions in mechanics. With monotonic bending and nonlinear bending theory, flexural yield strength of ZT1 MG with a thickness of 100 μm was determined to be 2050 MPa. Its bending proof strength at 0.005% permanent strain (σ_p,0.005%) was determined to be 1900 MPa, indicating that the beam-thickness effect on σ_p,0.005% is absent at least when the thickness was reduced from 1 mm down to 100 μm. As noticed, the response at σ_p,0.005% physically correlates with the propagation stress of embryonic shear bands, instead of the nucleation stress. In comparison with the current candidate materials in compliant mechanisms, ZT1 MG exhibits significant advantages in the components that the large-deflection elastic bending and high elastic-strain energy storage are desired.

采用三点弯曲（3 PB）方法，研究了Zr ₆₁ Ti ₂ Cu ₂₅ Al ₁₂弯曲时的非线性大挠度变形（ZT1）金属玻璃（MG）光束，厚度从1毫米到100微米不等。已经表明，通过增加跨度-厚度比可以实现更高的柔韧性，这对于经受大挠曲性能的挠性构件来说是期望的。此外，可以通过将载荷-挠度响应转换为无量纲形式来捕获大挠度情况下的MG梁的屈服事件。同时，可以根据力学上的理论分析解来证明引起屈曲事件的内在原因。利用单调弯曲和非线性弯曲理论，确定厚度为100μm的ZT1 MG的弯曲屈服强度为2050 MPa。在0.005％的永久应变其弯曲屈服强度（σ _P，0.005％）被确定为1900兆帕，表明在梁厚度效果σ _P，0.005％不存在至少当厚度从1mm减小到100微米。如注意到的，在响应σ _P，0.005％物理上与胚胎剪切带的传播应力，而不是成核应力相关。与顺应性机构中的当前候选材料相比，ZT1 MG在需要大挠度弹性弯曲和高弹性应变能量存储的组件中显示出显着的优势。