This paper shows that size effect curves for peak load are in most cases inconclusive when determining the tensile strength ft of quasi-brittle materials modeled with the cohesive crack model. Two different softening functions such as linear and trapezoidal give…
This paper shows that size effect curves for peak load are in most cases inconclusive when determining the tensile strength ft of quasi-brittle materials modeled with the cohesive crack model. Two different softening functions such as linear and trapezoidal give the same very accurate results for notched and unnotched three point bending beams but using different values of fr . The same trend is shown for splitting tests on square prisms. To determine the appropriate softening curve one needs additional experimental information such as the load- displacement curve.