Method for determining fracture toughness and tensile strength of quasi-brittle materials from two-point loaded specimens
A brittle material, fracture toughness technology, applied in the analysis of materials, strength properties, preparation of test samples, etc., can solve the problems of increasing the cost of test sample production and test workload, and difficulty in completing sample preparation and test work.
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[0041] Example 1: The concrete specimen of the two-point loading type used in the test of this example, the maximum particle size of the concrete aggregate d max = 13mm, L x B x W = 806.4 × 152 × 203.2 mm, initial seam height ratio α = a 0 / W = 0.30, 0.35, 0.40, 0.45, 0.50, W / d max =15.6.
[0042] see figure 1 , considering concrete as a quasi-brittle material, the peak load P The stress distribution when figure 1 As shown, the corresponding crack growth Δ a = β · d max . Based on formula (2), the nominal strength of each specimen can be calculated from the measured peak load σ n .
[0043] Think Statistically β= 1.0, the average value of concrete fracture toughness and tensile strength can be calculated, see figure 2 . Considering the discreteness of the concrete test results and solving it accurately, it can make β= 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4..., calculate the exact values of the fracture toughness and tensile strength of concrete,...
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