Publicacións

@article{li_simple_2024,

title = {A simple pseudo-Compact tension (textitpCT) test apparatus to determine the mode I fracture toughness},

author = {Yan Li and Miguel Herbón-Penabad and Andrea Muñoz-Ibáñez and Tonglu Li and Jordi Delgado-Martín},

url = {https://www.sciencedirect.com/science/article/pii/S0263224124012272},

doi = {10.1016/j.measurement.2024.115342},

issn = {0263-2241},

year  = {2024},

date = {2024-10-01},

urldate = {2026-04-21},

journal = {Measurement},

volume = {238},

pages = {115342},

abstract = {We introduce a simplified pseudo-compact tension (pCT) test apparatus, specifically designed to accurately determine the mode I fracture toughness (KIC) under direct tension conditions for rocks and other geomaterials. The device is compatible with conventional multipurpose loading frames typically available in many geomechanics laboratories. The mechanical behavior of the designed apparatus and the accuracy of the KIC determinations have been assessed through a 3D finite element model elaborated with ABAQUS and experimentally validated using aluminum and polymethyl methacrylate (PMMA) specimens under digital image correlation (DIC) examination technique. Results confirm the good performance of the new pCT apparatus, since it provides sufficient stiffness while yielding KIC values consistent with the reference pCT apparatus. Both devices measured an average KIC value of 1.80MPa m1/2 for PMMA specimens. This new device provides a cost-effective entry to the versatile pCT fracture toughness testing methodology, ensuring accurate and reproducible test results.},

keywords = {Digital image correlation (DIC), Mode I fracture toughness, Notch length, Pseudo-compact tension (CT) test, Stress intensity factor},

pubstate = {published},

tppubtype = {article}

}

@article{bello_complete_2024,

title = {Complete stress-strain analysis of masonry prisms under compressive loading-unloading cycles through digital image correlation},

author = {Ismail Bello and Fernando Martínez-Abella and George Wardeh and Belén González-Fonteboa},

url = {https://www.sciencedirect.com/science/article/pii/S0141029623015031},

doi = {10.1016/j.engstruct.2023.117088},

issn = {0141-0296},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {Engineering Structures},

volume = {298},

pages = {117088},

abstract = {This paper presents the findings of an experimental study focused on the behaviour of masonry structures subjected to uniaxial loading-unloading compression. The study's primary objective is to examine the impact of joint mortar on the failure mode and the development of permanent strains using the digital image correlation technique (DIC). Masonry prisms were constructed using two types of fired bricks and five different mortars, each with varying cement and lime contents. The prisms were instrumented with a linear variable differential transformer (LVDT) for displacement measurements and prepared for image processing using DIC. The prisms were then subjected to compression testing until failure to capture their complete behaviour. The experimental results obtained through DIC and LVDT measurements showed good agreement. The DIC technique proved its effectiveness in providing comprehensive strain evaluations of the brick prisms, enabling a detailed stress-strain analysis at a full-scale level. Furthermore, the study revealed that prisms with lower cement content exhibited a more ductile behaviour in the post-peak region, with strain localisation observed at the joint mortar interface. To validate DIC's reliability in characterising masonry's cyclic behaviour, the results obtained from analytical modelling were compared with those derived from DIC. This comparison aimed to confirm the accuracy and consistency of DIC measurements. Overall, this study contributes to our understanding of masonry behaviour under compression and highlights the capabilities of DIC in capturing strain patterns and providing valuable insights into the influence of joint mortar on the structural response of masonry elements.},

keywords = {analytical modelling, Digital image correlation (DIC), Joint mortar, Masonry, Stress-strain relationship},

pubstate = {published},

tppubtype = {article}

}

@article{bello_constitutive_2022,

title = {Constitutive behaviour of masonry prisms using a full-field measurement technique},

author = {Ismail Bello and George Wardeh and Belén González-Fonteboa and Fernando Martínez-Abella and Elhem Ghorbel},

url = {https://www.sciencedirect.com/science/article/pii/S2352012422010475},

doi = {10.1016/j.istruc.2022.11.008},

issn = {2352-0124},

year  = {2022},

date = {2022-12-01},

urldate = {2022-12-01},

journal = {Structures},

volume = {46},

pages = {1726–1736},

abstract = {To obtain analytical models for the compressive behaviour of masonry structures, it is crucial to accurately measure the compressive strengths of its constituents, i.e., brick and mortar. The mechanical properties and the stress-strain relationship under uniaxial compression are essential for thoroughly investigating and evaluating masonry structures. The present work aims to validate a non-contact measuring technique for obtaining full-scale strain and failure patterns and investigate joint mortar composition's effect on masonry behaviour. Forty masonry prisms were manufactured in this study using two distinct types of brick and five different types of mortar varying according to cement and lime contents. The results showed that 2D Digital Image Correlation (DIC) could generate full-strain assessments of masonry prisms, resulting in a full-scale stress-strain analysis. It was also found that, in the post-peak region, prisms with lower cement content exhibit a more ductile behaviour with strain localisation at the joint mortar level. Based on current experimental results and data from the literature, new analytical relationships were presented to predict masonry mechanical properties and masonry complete stress-strain compressive behaviour.},

keywords = {Analytical model, Compressive strength, Digital image correlation (DIC), Masonry, Mechanical properties, Stress-Strain law},

pubstate = {published},

tppubtype = {article}

}