Depth-sensing spherical indentation tests (SITs) have been widely used in tensile property calculations, but the accuracy and reproducibility of calculations may be significantly influenced by displacement measurement errors. Taking two representative tensile property calculation methods as examples, namely the analytical and numerical methods, the rationale as to why accurate and reproducible tensile property calculations cannot be expected from the depth-sensing SITs was discussed in detail. Subsequently, the proportional limit σ₀ calculation from plastic zone radius r_p measurements, which was analytically developed in the expanding cavity model (ECM) and experimentally measured by digital image correlation (DIC), was introduced to enhance the accuracy and reproducibility of the two representative methods. Principles for setting the strain threshold ε_th were established, and factors influencing the σ₀ calculation from r_p measurements were investigated through the optical system, the friction condition, the hardening behaviors of specimen materials, and the indentation depth. Through finite element calculations, it was proven that tensile property calculations at the existence of displacement measurement errors, particularly the constant error from the origin correction, can be significantly improved with the introduction of r_p measurements. Similar findings were also observed in experiments on four metals that exhibited different hardening behaviors.

深度传感球形压痕试验 (SIT) 已广泛用于拉伸性能计算，但计算的准确性和再现性可能会受到位移测量误差的显着影响。以两种代表性的拉伸性能计算方法为例，即解析方法和数值方法，详细讨论了为什么不能从深度传感 SIT 中期望准确和可重复的拉伸性能计算的基本原理。随后，由塑性区半径r _p计算比例极限 σ ₀引入了在膨胀腔模型 (ECM) 中分析开发并通过数字图像相关 (DIC) 进行实验测量的测量，以提高两种代表性方法的准确性和可重复性。建立了应变阈值ε _{th 的}设置原则，以及影响从r _p计算σ _{0 的}因素通过光学系统、摩擦条件、试样材料的硬化行为和压痕深度研究了测量结果。通过有限元计算中，证明了拉伸性能计算在位移测量误差，特别是从原点校正的恒定误差，存在可以与引入的被显著改善- [R _p的测量。在对表现出不同硬化行为的四种金属进行的实验中也观察到了类似的发现。