The Adobe delta damage model: A locally regularized rate-dependent model for the static assessment of soil masonry bricks and mortar

Piani, T. Li; Weerheijm, J.; Koene, L.; Sluys, L.J.

doi:10.1016/j.engfracmech.2018.11.026

Cited by 9 publications

(24 citation statements)

References 25 publications

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“…The model fits well all experimental curves of response of Adobe in statics also in softening regime, independently from fiber inclusion in the mixture (Figure 6(a-b)). This confirms the findings by authors that numerical models currently used for concrete like materials are suitable to address the response of adobe [22,23]. Furthermore, statistical inference on n for the two types of tested adobe suggests that this is a property of the soil mixtures, quantitatively linked to the 18% of fibers added.…”

Section: Analysis Of Data In Strengthsupporting

confidence: 88%

Dynamic characterization of adobe in compression: the effect of fibre fraction in soil matrix

Piani¹,

Weerheijm²,

Peroni³

et al. 2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Adobe is one of the most ancient forms of masonry. Adobe bricks are sundried mixtures of clay, silt, sand and natural fibres locally available joined together using mud mortar. Adobe structures are largely spread in areas of the world prone to earthquakes or involved in military conflicts. Unfortunately, almost no literature concerns the dynamic assessment of soil-based masonry components. From earlier research, it was derived that the mechanical behaviour of adobe in statics fits in the class of quasi brittle materials. Its resemblance with cementitious materials concerns the main failure modes and the constitutive models in compression. This study deals with the experimental characterization of adobe components response in dynamics. It is aimed to study and quantify the rate sensitivity of adobe material from bricks at a wide range of strain rates, from statics up to impact conditions. In particular, the influence of fiber reinforcement in the mixture on the mechanical behaviour of the material has been addressed. Adobe bricks are commonly mixed using organic content locally available in the field, from straw to chopped wood. Fibres are added to prevent shrinkage cracks during the air drying process. In modern materials such as concrete, inclusion of artificial fibres is originally meant to enhance the mechanical performance of the material, benefiting from the selective properties of reinforcement and binder. An experimental campaign was carried out in a collaboration between Delft University of Technology, Dutch Ministry of Defence, TNO and the Joint Research Centre (JRC) of the European Commission. Two types of bricks were tested. They both had the same soil composition in terms of mineralogical family and soil elements proportions but only one was mixed using straw and wood. Cylindrical samples were subjected to compression tests at different rates of loadings in compression: low (˙ 1 = 3 10 −4 s −1), intermediate (˙ 2 = 3 s −1) and high (˙ 3 = 120 s −1). High strain rate tests were performed using the split Hopkinson bar of the Elsa-HopLab (JRC). For each test, high resolution videos registered the failure process and force-displacement plots were

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Section: Analysis Of Data In Strengthsupporting

confidence: 88%

Dynamic characterization of adobe in compression: the effect of fibre fraction in soil matrix

Piani¹,

Weerheijm²,

Peroni³

et al. 2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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“…The experimental study has revealed that the mechanical performance of adobe is sensitive to the applied strain rate and its material resistance is enhanced when solicited by dynamic loadings. Analysis of data proves that macro-models developed for cementitious materials are suitable to simulate the mechanical response of adobe components [51] and the associated DIF parameters are within the same experimental ranges usually associated to modern geomaterials as concrete and mortar [5,55].…”

Section: Discussion: Interpreting the Role Of Fibers And Water Content In Statics And Dynamicsmentioning

confidence: 75%

“…A constitutive model from literature is proposed for the static assessment of the tested adobe components [48][49][50]. In fact, statistical analyses confirm that models originally developed for concrete can be used to interpolate the curve of response of adobe [51,52]. In this case, the stress-strain equation in compression proposed by Popovics for normal concretes of given aggregates compositions [53] is used to address both the tested types and drying conditions of adobe in Section 2.…”

Section: Strain Rate Parameter Typementioning

confidence: 99%

Dynamic behaviour of adobe bricks in compression: The role of fibres and water content at various loading rates

Piani

Weerheijm

Peroni

et al. 2020

Construction and Building Materials

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“…At the other end of the spectrum, damage models are well suited for predicting initiation and interaction between cracked regions but tend to suffer from spurious strain localization and mesh bias. Two popular solutions for this mesh size dependency are to either use the crack band method to introduce a length scale in the damage formulation or to use a rate‐dependent damage evolution in order to retard strain localization . These, however, do not remove the bias introduced by the orientation of the mesh.…”

Section: Introductionmentioning

confidence: 99%

Accelerating crack growth simulations through adaptive model order reduction

Rocha

Meer

Mororó

et al. 2020

Numerical Meth Engineering

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Summary Accurate numerical modeling of fracture in solids is a challenging undertaking that often involves the use of computationally demanding modeling frameworks. Model order reduction techniques can be used to alleviate the computational effort associated with these models. However, the traditional offline‐online reduction approach is unsuitable for complex fracture phenomena due to their excessively large parameter spaces. In this work, we present a reduction framework for fracture simulations that leaves out the offline training phase and instead adaptively constructs reduced solutions spaces online. We apply the framework to the thick level set (TLS) method, a novel approach for modeling fracture able to model crack initiation, propagation, branching, and merging. The analysis starts with a fully‐solved load step, after which two consecutive reduction operations—the proper orthogonal decomposition and the empirical cubature method—are performed. Numerical features specific to the TLS method are used to define an adaptive domain decomposition scheme that allows for three levels of model reduction coexisting on the same finite element mesh. Special solutions are proposed that allow the framework to deal with enriched nodes and a dynamic number of integration points. We demonstrate and assess the performance of the framework with a number of numerical examples.

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The Adobe delta damage model: A locally regularized rate-dependent model for the static assessment of soil masonry bricks and mortar

Cited by 9 publications

References 25 publications

Dynamic characterization of adobe in compression: the effect of fibre fraction in soil matrix

Dynamic characterization of adobe in compression: the effect of fibre fraction in soil matrix

Dynamic behaviour of adobe bricks in compression: The role of fibres and water content at various loading rates

Accelerating crack growth simulations through adaptive model order reduction

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