An Estimation Approach for the Effective Elastic Modulus of Lightweight Bulk Filling Material with Compressible Inclusions and Imperfect Interfaces

Li, Chengxuan; Wang, Jingguo; Dou, Fakai

doi:10.3390/ma13163563

Cited by 4 publications

(3 citation statements)

References 42 publications

(64 reference statements)

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“…Wang and Li et al [49,50] conducted a series of triaxial tests on EPS-cement lightweight clay, and found that increasing EPS bead content will also reduce the effective elastic modulus and compressive strength of this lightweight bulk filling material. However, these conclusions are at odds with the results of some studies [22][23][24][25].…”

Section: Discussion On the Strength Of Anchoring Agentsmentioning

confidence: 99%

Experimental study on anchorage performance of rockbolts by adding steel aggregates into resin anchoring agents

et al. 2021

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Pull-out testing was carried out to evaluate the effects of shape, size and concentration of steel aggregates on anchorage performance. Steel grit with particle sizes of 1.5, 2.0, and 2.8 mm and steel shot diameters of 1.4, 2.0, and 2.5 mm were used as steel aggregates and were added into the resin anchoring agent. For each kind of steel aggregate, either 30, 40 or 50 aggregates were used to evaluate the effects of different steel aggregate densities. Anchorage specimens were prepared using ϕ20mm rebar bolts and steel sleeves. Compressive and shear strengths of resin containing steel aggregates, the pullout curve, and the circumferential strain of the sleeves were measured, and the energy consumption was calculated. Results show that compressive and shear strengths of resin containing steel grit and steel shot are increased by 8.4%-17.0% compared to pure resin. For the aggregate numbers of 30, 40 and 50, the anchoring force is increased by 7.9%, 7.5% and 6.5%; energy consumption is increased by 19.2%, 15.0% and 18.6%; and the circumferential strain of the specimen is increased by 28.4%, 25.1% and 39.5%, respectively. The effect of aggregate size on anchoring performance is significant; that is, the aggregate sizes of 1.4~1.5, 2.0 and 2.5~2.8 mm increase the anchoring force, energy consumption and sleeve circumferential strain by 8.5%, 4.6% and 8.7%, 16.0%, 8.4% and 28.4%, and 17.9%, 23.3% and 51.9%, respectively. The relationships of the anchoring force, energy consumption, and circumferential strain with steel aggregate quantity and size are formulated. Results show that the addition of steel aggregates increases the compressive and shear strengths of the resin, and steel aggregate quantity and size have significant impact on anchoring performance. This paper provides the basis for optimization of resin anchoring agents used in the mining industry. The impact of anchoring agent shear strength and residual shear strength on the anchoring effect were also discussed based on the failure analysis of the anchoring section.

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Section: Discussion On the Strength Of Anchoring Agentsmentioning

confidence: 99%

Experimental study on anchorage performance of rockbolts by adding steel aggregates into resin anchoring agents

et al. 2021

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“…Эти оценки зависят от корреляционных функций, однако полный набор пространственных корреляционных функций, необходимых для вычисления эффективных свойств, как правило, не определен. Среди последних работ также можно выделить микромеханический подход, основанный на комбинировании тензора вкладов в жесткость материала и схем гомогенизации Мори-Танака и Максвелла [36]; новый метод определения макроскопических упругих констант композитов на основе гипотезы эквивалентности полной упругой энергии [37,38]; полуаналитическую модель описания представительного объема как ансамбля ячеек с различными свойствами и несовершенными границами раздела ячеек [39].…”

Section: Introductionunclassified

Лагранжев Формализм Для Анализа Акустических Свойств Двухфазных Композитных Материалов С Дефектными Межфазными Границами

Гриняев¹,

Чертова²,

Шилько³

2022

mkm

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Разработана новая механическая модель двухфазного композита, базирующаяся на построении функции Лагранжа и применении принципа наименьшего действия. Ключевое преимущество модели — прямой учет межфазного взаимодействия и наличия дефектов (несплошностей) на межфазных границах. В отличие от классических моделей непосредственным решением полученных уравнений данной модели являются значения скоростей упругих волн в композите, на основании которых далее могут быть определены эффективные упругие модули. На примере аналитического решения для 1D случая показаны качественно новые возможности, появляющиеся при использовании развитой модели для оценки акустических характеристик композитов и анализа влияния объемной доли фаз и поврежденности межфазных границ. Впервые теоретически показано, что помимо классических упругих волн с параметрами, с хорошей точностью оцениваемыми в рамках традиционных моделей, в композитных материалах с повреждениями на межфазных границах могут формироваться и устойчиво распространяться “медленные” упругие волны. Получены аналитические соотношения, позволяющие решать как прямую задачу определения скоростей “быстрых” и “медленных” упругих волн в композите с несовершенными межфазными границами, так и обратную задачу оценки поврежденности и объемных долей фаз по известным значениям скоростей упругих волн.

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“…Recently, the effect of interfacial damage on the effective elastic modulus of spherical-particle-reinforced composites has been investigated based on the linear-spring model by Yanase and Ju [ 27 ]. Further, many other theoretical models concentrate on the interface between inclusions and the matrix [ 28 , 29 , 30 , 31 , 32 , 33 ]. The microcapsules have a multilayer microstructure [ 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Global Sensitivity Analysis for the Polymeric Microcapsules in Self-Healing Cementitious Composites

2020

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Cementitious composites with microencapsulated healing agents are appealing due to the advantages of self-healing. The polymeric shell and polymeric healing agents in microcapsules have been proven effective in self-healing, while these microcapsules decrease the effective elastic properties of cementitious composites before self-healing happens. The reduction of effective elastic properties can be evaluated by micromechanics. The substantial complicacy included in micromechanical models leads to the need of specifying a large number of parameters and inputs. Meanwhile, there are nonlinearities in input–output relationships. Hence, it is a prerequisite to know the sensitivity of the models. A micromechanical model which can evaluate the effective properties of the microcapsule-contained cementitious material is proposed. Subsequently, a quantitative global sensitivity analysis technique, the Extended Fourier Amplitude Sensitivity Test (EFAST), is applied to identify which parameters are required for knowledge improvement to achieve the desired level of confidence in the results. Sensitivity indices for first-order effects are computed. Results show the volume fraction of microcapsules is the most important factor which influences the effective properties of self-healing cementitious composites before self-healing. The influence of interfacial properties cannot be neglected. The research sheds new light on the influence of parameters on microcapsule-contained self-healing composites.

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An Estimation Approach for the Effective Elastic Modulus of Lightweight Bulk Filling Material with Compressible Inclusions and Imperfect Interfaces

Cited by 4 publications

References 42 publications

Experimental study on anchorage performance of rockbolts by adding steel aggregates into resin anchoring agents

Experimental study on anchorage performance of rockbolts by adding steel aggregates into resin anchoring agents

Лагранжев Формализм Для Анализа Акустических Свойств Двухфазных Композитных Материалов С Дефектными Межфазными Границами

Global Sensitivity Analysis for the Polymeric Microcapsules in Self-Healing Cementitious Composites

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