Statistical Properties of Low-Cycle Fatigue Data of Type 316L Stainless Steel
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It is well recognized that scatter exists in experimental low-cycle fatigue (LCF) data obtained under a constant-strain amplitude loading condition. The objective of this study is to investigate the statistical variability of LCF data of hot-rolled 316L stainless steel at room temperature (RT). Strain-controlled LCF tests were performed at RT. A triangular waveform was used for fatigue testing with a constant strain rate of 4 × 10-3/s and strain amplitude of ± 0.4. RT LCF specimens exhibited remarkable softening behavior followed by initial cyclic hardening. The coefficient of variation (COV) for LCF property data, such as tensile stress, compressive stress, stress range, and elastic modulus in the 1st and half-life cycles, was 0.7%–6.2%. However, the COV of fatigue life was 20%. Additionally, the fatigue life followed a two-parameter Weibull distribution. The estimated shape and scale parameters were 6.12 and 8471 cycles, respectively. It was found that fatigue life had greater scatter than other LCF property data.
Abstract
It is well recognized that scatter exists in experimental low-cycle fatigue (LCF) data obtained under a constant-strain amplitude loading condition. The objective of this study is to investigate the statistical variability of LCF data of hot-rolled 316L stainless steel at room temperature (RT). Strain-controlled LCF tests were performed at RT. A triangular waveform was used for fatigue testing with a constant strain rate of 4 × 10-3/s and strain amplitude of ± 0.4. RT LCF specimens exhibited remarkable softening behavior followed by initial cyclic hardening. The coefficient of variation (COV) for LCF property data, such as tensile stress, compressive stress, stress range, and elastic modulus in the 1st and half-life cycles, was 0.7%–6.2%. However, the COV of fatigue life was 20%. Additionally, the fatigue life followed a two-parameter Weibull distribution. The estimated shape and scale parameters were 6.12 and 8471 cycles, respectively. It was found that fatigue life had greater scatter than other LCF property data.