Abstract

The rupture process in brittle materials is associated with tensile stresses at microscopic flaw scale inside their volume. Acoustic emission monitoring of diametral compression tests is an adequate option to assess the progression of damage. An improved algorithm for AE sources localization with P-wave velocity, vp, calculation and an enhanced methodology for P-wave onset time, called CLAPWaVe (Rodríguez 2015), is applied to analyze the distribution of damage and the evolution of stiffness within monzogranite specimens. Complementary analyses allowed the identification of four zones of damage accumulation within the specimen volume, each of them with different cracking levels, absolute energy release, EA, associated vp values, induced by different phenomena occurring during the loading process. The observed non-homogeneous damage distribution confirms that using a unique vp value to perform the localization of all AE sources, as usually adopted, is not representative of the real condition of the specimen.

Highlights

  • Tensile stresses generated by local stress concentration at microscopic flaw scale inside quasibrittle materials are responsible for the initiation and development of their rupture process

  • The localization algorithm of CLAPWaVe minimizes the error of searching for the coordinates of each AE source including vp as another unknown variable in the iterative process

  • The vp value associated to each AE source characterizes the mean properties of the specimen volume, defined along the trajectories between the AE source and each of the AE sensors that receive the signal emitted by this AE source

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Summary

Introduction

Tensile stresses generated by local stress concentration at microscopic flaw scale inside quasibrittle materials are responsible for the initiation and development of their rupture process. The distribution of damage inside a specimen under loading can be obtained by threedimensional localization of AE sources. Several works have reported on the three-dimensional localization of AE sources [2,3,4,5,6,7], but they consider vp as a known value that remains unchanged while damage is induced in the specimen. This assumption is not realistic and may affect the accuracy of the localization process and the accuracy of the AE sources pattern obtained. Aker et al [8]

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