Issue 41

Y. Yang et alii, Frattura ed Integrità Strutturale, 41 (2017) 339-349; DOI: 10.3221/IGF-ESIS.41.45 346 Loading rate ν /(mm/min) Flexural modulus E f ’/MPa tensile modulus E t /MPa compression modulus E p /MPa 0.1 2341.94 9304.05 15949.03 0.4 2515.55 9492.45 16872.67 0.7 2617.37 9565.97 17355.81 1 2660.74 9645.57 17401.38 Table 2: Tensile, Compression and Flexural Modulus Test Results under Different Loading Rates. According to the change rules of the three moduli with the loading rate, we use a power function (19) to fit the data: = ⋅ b E a v (19) The fitting results are shown in Tab. 3 and Fig. 7. Fitting parameters Correlation coefficient R 2 a b Flexural modulus 2661.22 0.056 0.996 tensile modulus 9631.25 0.015 0.993 compression modulus 17493.15 0.039 0.985 Table 3: Summary of Three Modulus Fitting Results under Different Loading Rates. 0.0 0.2 0.4 0.6 0.8 1.0 2300 2350 2400 2450 2500 2550 2600 2650 2700 Flexural Modulus E f / /Mpa Loading rates v /(mm/min) 0.0 0.2 0.4 0.6 0.8 1.0 9300 9350 9400 9450 9500 9550 9600 9650 Loading rates v /(mm/min) Tensile mmodulus E t /Mpa (a) Flexural Modulus (b) Tensile Modulus 0.0 0.2 0.4 0.6 0.8 1.0 15800 16000 16200 16400 16600 16800 17000 17200 17400 17600 Loading rates v /(mm/min) Compressive modulus E p /Mpa (c) Compression Modulus Figure 7: Change Rules of the Three Moduli with the Loading Rates.