Determination of Fracture Energy and Process Zone Length by Using Variable-Notch One-Size Specimens

Abstract

A new test method for determining fracture energy and process zone length, defined by the size effect law and its generalized theory, has been proposed. It allows the use of specimens of the same size and shape but with different notch lengths. This paper proposes test and data analysis procedures for using this variable-notch one-size method. By filling in a programmed spreadsheet, the measured maximum loads of the specimens, fracture energy and process zone length are output instantly. Tests have been conducted to verify the proposed method. It is shown that either eccentric compression prisms or split-tension cylinders can be applied to obtain accurate results. Since the method requires the maximum loads of several specimens of the same size and shape, it makes specimen preparation and testing very simple.